Jul 21, 2007. if you want torque on the street go oval with that stroker, if you want horsepower go rec, but the rpms wont be as quik with a 496, if you had a 502 rec heads would be nice to use because it has a better bore to stroke ratio for faster rpms. Machined for 2.250"/1.880" 11/32" valve stems. my research says:"Oval-port heads are capable of flowing enough air to support around 600-650 horsepower in stock form. on a 496 i wouldnt put oval port heads and a air gap intake. works with oval port heads oval port manifold, must be port matched to fit rectangular port heads new open plenum design 4500 series top uses mg 2013 gasket 5500-8500 rpm range : pm 1917: 8.730 fits brodix pb 1200 series / pb 2005 heads on a 10.200 deck block works with oval or rectangular port heads new open . The oval port heads were used for the standard output . More Facts I'd take everything with a grain of salt. This article, taken from the book by Ed . Uses standard valvetrain and standard rectangular port intakes making them ideally suited for 540-632 cubic inch engines. They are freshly redone but I know they aren't good for performance so there out. Words And Photos: Richard Holdener. As far as I know, the factory only used two different sizes of valves: 2.06/1.72" (typical for oval port heads), and 2.19/1.88" (always for rectangular port heads). 3994026: 1971: 454 : 425: 2.19/1.88 . Recommended for street, strip, or towing applications, these torque monsters can flow 354 cfm at 0.650 in. PORT 335cc ALUMINUM HEADS ASSEMBLED BRAVO-274. This is sometimes called the boundary layer effect. Replacement head for P/N 14011076. Available for 9.8" or 10.2" Deck Heights. Oval-Port Aluminum Heads Deliver Big Power In An Affordable Package! I have run all of these heads at one time or another, and they all produce stout performance right out of the box. CHECK OUT THIS TEST WHERE WE COMMPARED A SET OF FACTORY, IRON, REC-PORT (088) HEADS TO A SET OF AFR 265,. Other 'pairs' of 327 heads 1.94 vs. 2.02 intake valve size and different combustion chamber sizes are found in other years with casting numbers 3782461 (64 . Port matching from the head to the header is critical for peak performance. Chamber Type. If you're not going over that, don't waste your money. AFR MAGNUM BBC Aluminum Cylinder Heads - Fully Assembled Heads (Pair) AFR's MAGNUM line of cylinder heads for the big block Chevy are available in Rectangular Ports with 305cc, 325cc, 345cc, 357cc, 377cc and 385cc runners. 270cc Oval Intake Port Volume Unassembled, Bare Head Brodix 2060000 Part Number: 158-2060000 Brodix Race-Rite RR BB-O Series Cylinder Head 270cc Oval Intake Ports Race-Rite RR BB-O Series Cylinder Head 270cc Oval Intake Ports 119cc Combustion Chambers 2.250'' Intake / 1.880'' Exhaust Valve Sizes Bare, 1/pkg. They also make oval port heads. Don't discount the oval port configuration as being too small just because they used on mild production engines. Aluminum fits MKIV "C-port" also sold as a "solid" head. As the air moves closer to the port wall, the velocity begins to slow until it reaches the port wall where the speed is zero. Notes. The smallest of the bunch (peanut port) flows the least at around 250 cfm, while the conventional oval-ports flow around 275 cfm. Brodix 345/363cc 3Xtra Rectangle Port Cylinder Heads w/CNC Ported Chambers. As mentioned, this subject has been discussed in depth here. can the small afr 265 (oval-port) bbc heads make more power than the big rec port heads? Click Header to Sort. . This overlay of a rectangle port intake gasket over an oval port intake manifold offers an idea of the size difference between the oval and rectangle port heads. With the window down, place your hand out in the airstream about a foot away from the door while travelling at 30-plus miles-per-hour. 4.22. If you are considering a set of aftermarket aluminium heads, you can go with oval or rectangular with a smaller flow rate of 280 to 310 cfm. hot web series on mx player imdb tire shop open now International edition . I wish I could spring for the AFR's but, frankly, this whole project started as an oil pan swap on a perfectly good running BBC 427 and budget is limited. The stories about rect port intakes used with oval port heads are true. If it's going to be race, go with the square port if you plan on running 7000 rpm's. Oval's make the best power up to 6-6500. Avoid at all costs. Note the lazy-D shape of the chambers. The smallest, at 275 cc, is an oval-port design while the 310-, 325-, and 345-cc heads are basically rectangular-port heads. Compare the flow of your exhaust to a river. on: January 29, 2008, 04:15:25 pm . In that story, we attempted to dispel the myth that any powerful big-block combination must include rectangular-port cylinder heads. You can make a little torque monster out of it. Cylinder heads are an integral part of any performance equation and the best thing about a set of great cylinder heads is the better the combination, the more power they are worth. JOE SHERMAN RACING. In the 60's there were few aftermarket bbc intakes available. RPM Xtreme big-block Chevy heads have a 24.5 x 4.4 intake valve angle, 15.5 x 4.2 exhaust valve angle, stock exhaust port locations, and the spark plug angles have been modified to produce a smooth flame front for increased fuel efficiency and maximum power. Brodix 351/365cc 3Xtra Oval Port Fully CNC Ported Cylinder Heads. The friction from the interface between the air and the port walls is what contributes to this effect. DYNO TEST - 467" Big Block Chevy with GM Iron Oval Port Heads / Tunnel Ram how much better are aftermarket bbc heads? 84-96. rect . No doubt, the rectangular port heads have their place. This is because they are better at getting more fuel and air into the cylinder at higher RPM's than the oval ports. These new 24 heads are available in an oval or rectangular port. 14044861. $4395. Indeed, some heads are termed oval, such as the Edelbrock E-Street and Performer RPM with their 290-cc ports, but in fact, they are more like a . This new oval port design has an amazing port velocity second to none. little intake on big heads) under certain conditions, without knowing any facts to back up such a plan. It`s not AS MUCH of an issue if the header is slightly larger, but smaller is terrible. Aluminum performance cylinder head. Port Type. do the afr 265 bbc heads work well? PT ALUM. Several members here on TC have used rect port intakes on oval port heads with excellent success. The SNIPER BBC Intake Manifold Series is designed with the perfect runner to plenum volume to maximize the power and acceleration curves of your engine. how much power can afr heads make? A good starting place would be cast iron, large oval port, open chamber casting #'s '781', '049', '359' or '241'.In 1996, Chevy introduced an over the counter aluminum open chamber head with large oval ports.This is the first factory big block aluminum head with large oval ports.This head will fit and seal with Mark IV, Gen V and Gen VI.. We used rectangle port heads, .630" solid lift cam, tunnel ram intake with (2) 750 Holleys and 2 1/4" dry headers. This is a great performance upgrade to standard Dual Plane intake manifolds for your 454 Big Block Oval port cylinder head application, Power range is between 15000 rpms to 6500 rpms. The 565 was fed by an 1150 Holley but not just an out-of-the-box version; this 2-circuit Dominator was given the once over by Sean Murphy Inductions. Currently running a set of oval port 97cc closed chamber heads # 3856206 and am maxing out at 4800 RPM's. . 315-cc rectangular intake ports. These heads produce more torque at lower RPMs. In stock form, oval-port heads (Top) are capable of flowing enough air to support roughly 600 to 650 horsepower. With no trans brake, the oval ports are going to give you better acceleration/torque off the line, but simply can't move the same amount of fuel and air that the rectangles will. Big Block Chevy BBC 396 427 454 Oval Port Heads 353049 049 (same as 781 heads) $475.00 +$180.00 shipping. But for less radical combinations, the oval ports are the choice. But you don't have to take our word for this. Iron, rectangular-port . BBC Cylinder Head Casting Numbers: RECTANGULAR PORT - Valve size 2.19 intake, 1.88 exhaust: Casting # Years: CID: Chamber: HP/RPO/Comments: 3904392: 1967: 427 They are about half the size of a oval port and is the most useless head known to a bbc. Yea it works. . It would simply tear the tires off in the first three gears. adopt me steal pets script; unifi switch suddenly pending adoption; college football depth charts; where can i use my dcr parking pass Add to cart. check out this test where i ran a set of peanut port heads, a set of rec-port heads and a set of ported oval-port (049) heads on the same 468 . Old school means real! My local speed shop guru is in agreement with you all. Cast iron, oval-port and similar to #3931063 with change to open-chamber design, redesigned intake and exhaust valve seats, and tapered spark plugs. As far as the "oval VS square port" question; I'm thinking that the vacuum created across the power band with the 1/4" arm (piston speed first 90 degrees) could "overpower" the velocity/atomization gains of the oval port heads, right where it makes the power . Two port designs are offered, a 300cc Oval and 325cc Rectangle. Two cast-iron versions are offered in both rectangular and oval exhaust ports with open combustion chambers. I have found that it will acctually wakes up the bottom end a pinch, kinda like a velocity thing. All heads are made with A356 aluminum and are equipped with high quality components throughout. 110-cc exhaust ports. The newest series of larger, rectangular port BRODIX BB-3 XTRA features fully CNC ported rectangular ports. There are a few occasions where rectangle port heads work great. There seems to be some confusion about the different head types used on Chevy Rat motors. World Products manufactures its Merlin line of cylinder heads for Chevrolet big-blocks. Edelbrock Big Block Chevy marine heads are sold with seals and valves only for a variety of combinations. Use the search feature and have fun reading. To put in 2.19/1.72" valve combo would be pretty weird - to use any other size intake valve would be even weirder. Rectangular-port heads (Bottom), were designed primarily for engines that spend much of their time at higher RPM. Chevrolet Big Block Cylinder Head Casting Numbers. operating at or below 6,200 rpmproviding tons of bottom-end torque, tremendous throttle response, and great all-around power. Location: santa ana calif-92703. Open or Closed Combustion Chambers Cast-iron late-1960s "206" head with bathtub-shaped Cast-iron high-performance rectangular port "990" head 98-cc closed combustion chambers with open 118-cc combustion chambers. Anyway the motor came with 2 sets of heads. BBC CHEVY 496-572 BRAVO 335cc REC. . Available $869.00. Back in those times it was found to be advantageous to install the bbc rectangle port intake on the oval port head. Fits all 396-502 engines with large oval-port heads; NOTE: Open carburetor spacer is not recommended with use of dual-plane manifolds. He happens to have a used Edelbrock C454 oval port intake with Dominator flange that I can probably swap my Victor rectangular port for. AFR 265cc Oval Port Magnum BBC cylinder heads are designed to be used on engine displacement up to 468 cu. Cylinder Head Type: Oval Port- Large PowerGap "HP" series Oval port intake for 454 Marine based engines. item 1 1971-72 Big Block Chevy BBC LS6 454 Rectangle Port Heads 3994026 026 B-2-72 NICE 1971-72 Big Block Chevy BBC LS6 454 Rectangle Port Heads 3994026 026 B-2-72 NICE . Use on all Big-Block engines with rectangular intake port heads 396- through 572-cubic-inch; Includes 2 gaskets . Our MAGNUM line of cylinder heads for the big block Chevy are available in Oval Port designs with runner volumes of 265cc, 290cc, and 300cc or Rectangular Ports with 305cc, 315cc, 325cc, 335cc, 345cc, 357cc, 377cc and 385cc runners. The so called square port heads are mostly what we have called "peanut port". It's all about port velocity at lower engine speeds. If the header port is too small, the flow would be similiar to whitewater, If it`s too large it would be similiar to water flowing over a . the big block LS6 low rise rectangle port intake , used on the 1970 chevelles for hood clearance, can be used with the large oval port heads useing the rectangle port gaskets, theres a very noticeable miss alignment but it works just fine as an option if getting the car ro run is the main concern, (place a rectangle port gasket on the oval port . Other than differences in cfm & flow volume, what is the substantial difference between oval and rectangular port heads ? DO WE REALLY NEED REC-PORT HEADS TO MAKE BBC POWER? 19131359 High-Rise Intake Manifold - Rectangular-Port, square bore, Holley Carburetors . However, the larger volume of the rectangular ports does have a drawback. HEADS FOR SOLID ROLLER CAM BRAVO-919. The combination actually does fit without leaking and it actually does make gobs of low/mid range torque. Rectangular-port heads (bottom), should be reserved for engines that spend much of their time at high engine rpm." This engine did come from a big truck, so I'm guessing high rpm wasn't what this engine was about. The SNIPER Series features cast injection bosses, 4500 series carburetor flange, four corner water bosses and your choice of oval or rectangle port . Available Add to cart. (Image courtesy of www.chevydiy.com) Runner volume (length) is also a very important consideration. Lots of guys have done it and most wouldn't want to admit but let er rip. If you're going to just have it on the street scene, I'd stick with the oval ports. The Pro 1 as-cast heads come in four port sizes. Smitty is correct - out of the box their airflow is substandard. A peanut port is a truck head that is not designed to rev over 4000 rpm. Casting Number. Best Selling in Cylinder Heads. The next set are 3931063 heads which look to have low miles on them and I also have the heads off my old motor which are 3964290 heads. In past years, several of the BB engine "experts" have flatly stated that installing a rectangle port intake on oval port heads would cause a flow reversion at the mating ports and it just would not work well. 14092360.86-90.oval.OPEN.454 Truck, "peanut" round ports Peanut port BBC cylinder heads may not be ideal for peak performance engine builds,, but they are far from useless, if your willing to do minor port and bowl clean-up and correctly match components, to maximize potential. Equipped with the right oval-port heads, the 468 easily exceeded. This is an interesting comparason between the oval and rectangular heads. $3395. This is a wetflow test that Dart's Tony . Many heads with port volumes in the range of 300 to about 345 cc exhibit properties of port flow distribution, top to bottom, that are more like an oval port rather than a factory rectangular port. Brodix Cylinder Heads Race-Rite oval port cylinder heads for big block Chevys bolt on directly in place of your stock heads, so you can reuse your intake manifold and pistons. This oval port-headed Chevelle ran as good or better than most of the factory 375 hp rectangular port cars we raced against. I have a rec tunnel on a pair of ovals and it works real well on my set-up although my heads have been worked a bit on the intake side. T&D Shaft Rocker System Available In 1.70, 1.75 or 1.80 Ratio (Split Ratio Sets No Extra Charge). I saw it with my own eyes back about 35 or 40 years ago-- Square port tunnelram on oval port heads, car picked up 7 or 10 MPH in the quarter-- I worked at Edelbrock at the time, they all said it should NOT even run, let alone pick up 100 HP. The rectangular ports are physically larger than those of the oval-port cylinder head, therefore they have higher airflow-volume capabilities than production oval port heads. ports and large oval ports BBC Heads. Compression Ratio Question on BBC. By PPN Editor July 23, 2015. This NHRA-legal aluminum cylinder head is a replacement for the L88 Big-Block cylinder heads used on 1968-1971 Corvettes and 1969 Camaros. To answer your other question a regular oval port intake will work just half of the port is covered because of how small the ports . The Brodix BB-3 Xtra 332 heads tested on our 496 are . These are good but your intake will not fit since made for rectangular. Next, slowly move your hand closer to, but not on, the door skin. Year. With the oval-port heads, you can select from 269cc, 320cc or 350cc intake ports, depending on your engine performance needs. 330864. . View Details $701.99 The obvious appearance difference of the ports also has an effect on performance. $4650. These are small square port heads used on some trucks. BBC CHEVY 496-572 BRAVO 335 REC. This is a really mild combo, but I think you would need to get a lot more radical (as far as cam lift) before the rectangular heads would really start to shine. Recommended for aggressive street, street/strip or race builds with displacements up to 540 cubic inches, operating up to 6800 RPM. The power falls off fast at around 5000-5500 but pretty incredible at 2000-5000. With your fingers pointed toward the direction of airflow, note the amount of resistance you feel. by bigjoe1 Thu May 07, 2009 12:02 am. lift. In the 90s on the redesigned Gen V Big Blocks, a small oval Port (Peanut Port) was introduced for use on Truck applications. Recommended Components Specifications Instructions Footnotes Reviews AFR's 300cc Oval Port heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. PORT 335cc ALUMINUM HEADS BARE SET/PAIR. This is excellent information to prove that oval port heads are the best choice for "milder" applications that are under 500 CI and have a max RPM in the 6500 range. (dry centers, wet walls) Even GM's oval port 502's are a 4" arm . They are sent out the door apparently assuming someone will do some work on them. Fig. A good aftermarket oval port head will make outstanding power even on . A Little Something Xtra: Brodix BBC Head Test. BBC Head Casting Numbers. Chamber Size. C.I.D. Both the oval and rectangular port heads are hard anodized to protect the aluminum in the harsh marine environment. http://www.compcams.com/Community/Articles/Details.asp?ID=-1989283802 Adam 427L88 Premium Member Joined Sep 9, 2000 Some people think there are only "oval" or "rectangular" ports, and some people don't understand the deal with "open" vs. "closed" chamber heads. Chevrolet. From what I've seen in discussions, the bigger rectangular port heads are good for higher rpm (makes sense, they should flow better) and ovals are good for more bottom end torque, which doesn't make as much sense. Need port work also as mentioned below. Feeding the magic oval-port heads was a Dart single-plane intake ported by Roger Helgeson. The oval port head has 110-cc chambers, and the rectangular port head comes with 118-cc chambers. All heads are made with A356 aluminum and are equipped with high quality components throughout. Brodix 366/380cc 3Xtra Rectangle Port Fully CNC Ported Cylinder Heads. The port mis-match between a peanut-port head (aptly named) and oval is less than an oval-to-rectangular, and while I could see using an oval-port intake on a rect.-port head (i.e. They are the choice for ALL-OUT performance. The Low Down On BBC Heads. RECTANGULAR PORT - Valve size 2.19 intake, 1.88 exhaust 7 results. The first set are peanut port 14081045 heads. accueil engine code. The precision designed 298 cc intake port flows well in the 390 cc range. Tags compression question ratio. WITH VELOCITY, not just "more, from huge port rectangle port heads), and CAN come out on top. This engine makes 800 hp, of course it turns 7000 rpm through a V-Drive. The BP RR-3 XTRA O is designed to be the ultimate 100% CNC ported street/pro-street head available on the market today. The rectangular ports heads were used for high-output performance engines. I run Stage 1 ported '049's on my flat-topped 454 and pull an . Our engineers took the 454 HO - with its super-tough, all-forged reciprocating assembly - and matched it with a set of higher-flow, oval port aluminum cylinder heads to pick up an additional 15 horses, while still offering 500 lb.-ft. of torque. Because the stock exhaust ports are in the stock location, you don't have to worry about header or manifold interference. The performance-oriented, rectangular-port heads step these numbers. May 4, 2008 . The oval port heads were used for the standard output engines in cars, trucks, and boats. For stock heads, oval ports are best for the street. Last year, we put together a 468 BBC for a guy running a flat-bottom in quarter mile drags. in. The oval-port heads have 110cc chambers and the rectangular port heads have 118cc chambers. It is the nature of the racer to re invent the wheel. The intake was flanged to accept a 4500-series Holley carb.