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Topic Review (Newest First)
09-19-2012 11:19 AM
ryan v i'll probly make a plenum divider. My compression should be between 9 to 1 and 9.5 to 1. i'm runnin 186 double hump heads and the cam was advanced. The truck its in has 4.10 gears but a stock converter.
09-18-2012 12:10 AM
F-BIRD'88 The 7546 will work a lot better for you if you put the plenum divided plate in it.
Either buy it or make your own out of sheet metal.
A performer RPM is way better.

this is really going to suck with stock unported heads and low compression.

Both the intake and the cam need compression and rpm.
Get a 3500stall and gears.
If the compression ratio is less than 10:1 advance the cam more.
09-17-2012 11:28 AM
ryan v I ended up not buying the offy intake.
Another question i have is would it be a good idea to try a divider plate for the weiand or just leave it open?
09-15-2012 03:16 PM
Mr. P-Body What is written about the Offy Dual Port is 100% correct. What ISN'T written, is the divider takes up so much "room" it changes the shape of the overall runners, severly restricting it at all ranges. I saw 100 small blocks and Pontiacs with that "thing" on them in the '70s. C4-B (C-327-B) and P4-B would out-perform it at all levels, including low-end.

Edelbrock "Streetmaster", though useless above 4,500, was one open-plenum intake that could make low-end torque. The runners are so small, velocity is crazy-high. Tough to tune and not real fuel-efficient.

We use Super Victor ONLY on engines 400 CID-up. Victor (any of them) is a RACE intake, not really well-suited to street use. The power bands are very specific and usually quite narrow. Plenty of folks run them on hot street engines, and they DO "work". Victor, jr. on a 406 is a pretty nice "driver" if you don't rev it too hard. But this discussion started over a torque build... (:-

Jim
09-15-2012 09:52 AM
ap72
Quote:
Originally Posted by vinniekq2 View Post
AP,the super vic flows more air,true.The vic jr will feed a 440 to 7,000 rpm.The super vic will feed the same engine to 8500 rpm.
So why not put a 4781 holley on that 283 to match the vic jr?
If I built a 283,I would use the torker intake and a 750,where other people would likely use the performer.Its all about where you want the power and how much you are going to make.That 283 wont move enough air to make 650 horse power where a vic jr will flow enough air to make 650 hp.I had an offy dual port on my 65 acadian with a 283 and a carter carb,,,,It was not very impressive,,,
I wasn't referring to the flow, just the runner and plenum shape and size.
09-15-2012 09:40 AM
vinniekq2 AP,the super vic flows more air,true.The vic jr will feed a 440 to 7,000 rpm.The super vic will feed the same engine to 8500 rpm.
So why not put a 4781 holley on that 283 to match the vic jr?
If I built a 283,I would use the torker intake and a 750,where other people would likely use the performer.Its all about where you want the power and how much you are going to make.That 283 wont move enough air to make 650 horse power where a vic jr will flow enough air to make 650 hp.I had an offy dual port on my 65 acadian with a 283 and a carter carb,,,,It was not very impressive,,,
09-15-2012 09:21 AM
ap72
Quote:
Originally Posted by vinniekq2 View Post
Super vic is the biggest manifold or close to it that you can use before a custom intake or sheet metal intake.I wouldnt recommend it to many people.The vic Jr is better for hot street engines.

the tanantula and torker are both good manifolds if used on the correct engine.I would use either before using a performer.I would recommend that other people use the performer though.The edelbrock scorpion was a great manifold before the improved vic jr.If you are on a budget then sometimes a used intake is a good deal.If you want the "best" for your application then you have to buy exactly what fits the situation.
We all seem to agree that the offy is not the answer.
JMO but there isn't a chance in hell of me using a Vic Jr. when I can use a Super Vic in its place. UNLESS you're dealing with really small cubes like a 283 or smaller.

to 6,000- RPM, past 6,000 super Vic.
09-15-2012 09:10 AM
vinniekq2 Super vic is the biggest manifold or close to it that you can use before a custom intake or sheet metal intake.I wouldnt recommend it to many people.The vic Jr is better for hot street engines.

the tanantula and torker are both good manifolds if used on the correct engine.I would use either before using a performer.I would recommend that other people use the performer though.The edelbrock scorpion was a great manifold before the improved vic jr.If you are on a budget then sometimes a used intake is a good deal.If you want the "best" for your application then you have to buy exactly what fits the situation.
We all seem to agree that the offy is not the answer.
09-15-2012 08:46 AM
ap72
Quote:
Originally Posted by 55_327 View Post
Doug Flynn at Holley told me their dual plane Stealth (now Speed Warrior) manifold makes better power than the X-CELerator up to almost 6000 RPM. So, unless your engine spends most of its time above 6000 RPM, a dual plane is the way to go. The Street Warrior places an emphasis on low-mid range torque, but even it probably kicks the X-CELerator's butt up to 4500 RPM or so.

Just because the engine will run at 1500 RPM with an X-CELerator doesn't mean the power band goes anywhere near that low. Being required for a certain racing class is the ONLY reason to use one.

Jeff, I love the old school stuff, even some GM 283/327/350 cams. But this manifold is a relic.
On top of that the intakes mentioned really aren't even good single planes when compared to something like the Super Vic.

Just like the old Torker II- its a manifold that you can buy used for $25 and an engine will run with it but it isn't great for anything other than being a cheap intake to put between the carb and heads.
09-15-2012 07:23 AM
55_327
Quote:
Originally Posted by ap72 View Post

An RPM manifold will walk all over it.
Doug Flynn at Holley told me their dual plane Stealth (now Speed Warrior) manifold makes better power than the X-CELerator up to almost 6000 RPM. So, unless your engine spends most of its time above 6000 RPM, a dual plane is the way to go. The Street Warrior places an emphasis on low-mid range torque, but even it probably kicks the X-CELerator's butt up to 4500 RPM or so.

Just because the engine will run at 1500 RPM with an X-CELerator doesn't mean the power band goes anywhere near that low. Being required for a certain racing class is the ONLY reason to use one.

Jeff, I love the old school stuff, even some GM 283/327/350 cams. But this manifold is a relic.
09-15-2012 05:35 AM
ap72
Quote:
Originally Posted by JeffB View Post
You might want to read the RPM range as posted here http://www.holley.com/data/Products/Technical/W504.pdf This manifold is almost mandatory by some stock car rule books,it takes torque to pull off the corners on an oval track and the 7546 will deliver the goods.
That intake is required as a RESTRICTION, its a POS and thus limits power. Engine rules are almost never made for the sake of going faster.

An RPM manifold will walk all over it.
09-15-2012 01:38 AM
JeffB
Quote:
Originally Posted by 55_327 View Post
I love the Street Warrior on my 327. It's a much newer design than the Performer or even the Performer EPS. And the rear vacuum port clears Holley float bowls.

That single plane manifold is hurting your power at RPMs up to 4500 or even higher. The problem is all 8 intake valves are exposed to each other. That means, for example, while piston #1 is half way down the intake stroke, cylinder #8's intake and exhaust valves are both open (during overlap). This means some of cylinder #8's exhaust gasses are sucked through the intake plenum and into cylinder #1. And this is repeated on every intake stroke of every cylinder. The larger the cam, the more the overlap, the bigger the problem -- at least at low-mid RPMs.
You might want to read the RPM range as posted here http://www.holley.com/data/Products/Technical/W504.pdf This manifold is almost mandatory by some stock car rule books,it takes torque to pull off the corners on an oval track and the 7546 will deliver the goods.
09-14-2012 10:00 PM
55_327
Quote:
Originally Posted by cdminter59 View Post
If you have you engine built for low end and mid range power then these two intakes are your best choice. Edelbrock Performer or Weiand Street Warrior.
I love the Street Warrior on my 327. It's a much newer design than the Performer or even the Performer EPS. And the rear vacuum port clears Holley float bowls.

That single plane manifold is hurting your power at RPMs up to 4500 or even higher. The problem is all 8 intake valves are exposed to each other. That means, for example, while piston #1 is half way down the intake stroke, cylinder #8's intake and exhaust valves are both open (during overlap). This means some of cylinder #8's exhaust gasses are sucked through the intake plenum and into cylinder #1. And this is repeated on every intake stroke of every cylinder. The larger the cam, the more the overlap, the bigger the problem -- at least at low-mid RPMs.
09-14-2012 09:39 PM
JeffB
Offenhauser Dual Port

"Back in the Day" I was a manager here (see Pic Below) around 1976 I had the pleasure of talking with Fred Offenhauser Jr. for a while and we talked about the Dual-Port it is and was a much better intake than many give it credit for,tuning it is where the problem lies.Offy claimed the Dual-Port primary runners which are smaller increased the speed through the runners to a much higher speed and velocity this was to provide increased fuel economy and low end performance then when the Carbs secondaries opened the primaries velocity would suck the secondary flow along for the ride.The trick was finding a leaner jetting and correct power valve with a Holley and playing with the jets and rods in an AFB Carter or Quadrajet for the primaries.The higher velocity primaries changed the amount of vacuum reading you would get.I have used them on SBC's and they can work well,the manifolds with the spreadbore base for some reason worked better than the square bore intakes.The Weiand Accelerator you have is actually a good match for your cam and stock heads as the ports are not overly large,for a dual plane with your setup the Weiand 8004 would be OK a cam swap to a Comp Cams CL12-231-2 would up that low end and mid range over what you have,it all gets down to budget.
09-14-2012 12:43 PM
Mr. P-Body Based on the lower rev desired, RPM may take away too much velocity at lower engine speeds and hurt low-end torque.

Offy "Dual Port 360" is possibly the worst intake ever made by anyone... It's a good idea, it just doesn't work.

Wieand intakes have been around forever. I'm not versed in their part numbers. We've had far more success with Edelbrock than the others combined. Some of the old Wieabnds were cast at the Winters foundry (the little "star" with a "W" in the middle is seen on them, where GM's factory aliminum intakes were cast). There has been speculation that some of the Wieand and Chevrolet offerings were the same, only part numbers being different.

The "key" to a torque engine is smaller runners and lower revs.

FWIW

Jim
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