BBB Highest HP w/exhaust manifolds (no headers)?

Who has the highest HP through exhaust manifolds and what's your combo? Strokers, rollers, and aluminum heads are welcome.

 

"The engine was built and dyno'd by Mike Laciura at Wildcat Performance and made 696 hp at 5,600 rpm and 780 lb-ft of torque at 3,600 rpm. It uses TA Performance Buick Stage 1 cylinder heads prepped by Champion Racing Heads with 2.20/1.72 valves. The stock iron Buick intake is topped with with a 750-cfm Q-Jet by Richard Lasseter (remember him, too?). The crank, aluminum rods, custom pistons, billet roller cam, lifters, block girdle, lifter girdle, and 1.65:1 shaft rockers are all from TA, and the stock Stage 1 distributor was set up by Mike Phillips at Automotive Machine and Performance. The 2.5-inch exhaust came from the GS Club of America. The trans is a competition TH400 with a 9-inch Coan converter, and a Canadian Buick 12-bolt carries 3.73 gears. The Buick weighs 3,940 pounds with Jim in it."

Link to info is here: http://www.hotrod.com/eventcoverage/hrdp_0702_hemi_vs_buick/viewall.html

Not sure if the engine was dyno'ed with the manifolds on, but it has them in the picture.

This Buick was beaten by two other 'competitors' who used stroked out 14:1 compression engines. The Hemi lovers couldn't stand being beaten by a Buick, so they had to bore and stroke and use every trick in the book to make sure they outgunned it. I guess whatever it took to beat the Buick eh? A hollow victory to say the least.

The Buick didn't do too bad considering it was castrated with the 750 Qjet and iron manifolds.

Quick info: 696 HP @ 5600 RPM, 780 ft. lbs. @ 3600 RPM.

 

gess

Gesslers car made a ton of power through iron manifolds and heads in the fast series, don't know exactly what it made though.. And i am not for sure it got near 700 like the one just mentioned.

 

interesting, that's a lot of torque.

Any other 600+ HP combos through ported exhaust manifolds?

 

I dont know particulars but Jim Rodgers has to be a top contender here.

 

Just for sake of comparison / info ,my old mans engine made 498 at 5600. And 560tq at 4100 on Wildcats dyno years ago, ported iron heads, ported intake and exhaust manifold, 107 window rattler 499 lift, 1.60 TD's, 13.8 comp, 464cid,dizzy and carb prepped by myself at 3780lbs on street rubber was good for 12.40s at 115mph 1.85 60ft no option 4 speed. Bone stock susp and 342 gear

 

anyone else with a 600+ hp combo?

 

Hang on for a moment here. It might be helpful to know why you're asking the question.

There's a big difference among a stock set of manifolds versus a set that have been port matched with outlets opened up, versus a set cut into pieces, re-contoured on the inside and welded back up again. The difference from one extreme to the other is zero dollars, zero hours of work compared to big money and many, many hours of work by people who are crazy enough to do it, and do it well.

So, what amount of work are you willing to do, or was the question just one of curiosity?

Devon

 

How about add if you've spent more or less than $1000 in exhaust manifold porting.

 

I feel sure everyone has spent less than a grand on manifold porting. I dont know anyone who has cut exhaust manifolds apart to port them, then weld them back together, even Gessler. I know I never have, they probably would never hold up anyway being cast. The manifolds I ran 10.20's with have 2.400 outlets and the inlets ported, nothing special. I have ported manifolds for some of my customers that are better than my own.

My old engine made 696 with the manifolds and 734 with headers. Iron intake and qjet also.

 

Those are impressive figures Jim.
Cheers

 

Jim, your old engine mentioned above, what was your cam, stroke, rod length, bore, and compression?
Also, sent you a PM for porting

 

Roller, 4.5, 7.1, 4.37, 13.0

 

I should've asked about deck height, did you build that up as well to accommodate the 4.5" stroke and 7.1 rods? LOL

Jim, you get the most efficient answer of the year award!!!

 

Nope. Just put the pin pretty high up in the piston.

Hey, I answered your question tho right?!

Hint, there is power in carb tricks at this level with a qjet. And believe it or not, the iron intake is as big a hurdle as the exhaust manifolds, if not bigger.

 

I believe it.

 

Hey Jim!
I'm tired of listening to the sound of headers and would love to lower the volume of my car.
Sounds straight forward to port the stock exhaust manifolds and have them flow pretty good.
can i assume, gasket match, smooth transitions and weld a larger flange?
Cheers~

 

Porting exhaust manifolds properly is a LOT of work. The stock outlets are 2". They need to be in the 2.30-2.32 range for a hot street driven car. And in the 2.350-2.400 range for race/rarely driven on the street. Lots of work to do this. Porting is dirty work, and you will need a good respirator because grinding dust is bad stuff.

Then the inlets need to be smoothed and match ported and usually the roof needs to be raised to match well ported heads. Some of the ports require much more work than others.

Hopefully no broken bolts need to be removed, and sandblasting in advance of porting is very highly recommended.

I do not recommend welding on a new outlet flange to the novice. Stick with the factory outlet flange. Installing new flanges is quite a lot of work. I will have a set of manifolds on display in BG that I installed new flanges on. Gary Paine has been testing them for me.

My suggestion is to buy a set that have already been well ported.

 

Thanks Jim,
My current set up is street / bracket car. runs low 12's.
i don't really care if it slows down a bit.
I'm a do it yourself kind of guy, so,
i think i'll have a day of grinding and see how the change effects my car.

i'm in my 50's and my hearing is still good, when my hearing goes, i'll put the headers back on. LOL
Cheers!

 

Good luck with it. Let us know how it turns out.