371 build W/Big Mouth heads

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Anybody on here that could port a set of 308 heads. They have been fitted with Edelbrock 2.02 &1.60 valves 11/32 valve guides the Edelbrock Springs and retainers.

Not meaning to hurt this thread. I'm building a .030 over 360 from a garage full of spare parts. Inspired by this build.
 
RAMM, Is there any concern with the valve train considering the .350 offset rockers and lifters?
 
Be curious to see what that motor makes with those butchered heads.
We just modified/ rebuilt a 30 over 360 and are very happy with results thus far.
Has eddies that were ported in an evening moderately, bigger flat tappet than this motor260/264@50, that is probably too big, but was on the shelf and wanted to get it running.
Airgap that is untouched, 950 carb, dinky 1 5/8 headers, 727, and a mismatched 4500 convertor
Car weighs 3300 and has been 117 mph thus far shifting it at exactly 6 grand. Crosses at about 6150. Bone stock shortblock, heads milled and thin gasket to achieve 10.5 compression
Not sure what 117@ 3300 is but its gotta be 500ish horse, and with a 904 and correct convertor i think it will run 119-120 pretty easily.
This build in this thread should make 550-575 even with the small cam, but those heads are mighty suspect.
 
B3422w5 said:
Be curious to see what that motor makes with those butchered heads.
We just modified/ rebuilt a 30 over 360 and are very happy with results thus far.
Has eddies that were ported in an evening moderately, bigger flat tappet than this motor260/264@50, that is probably too big, but was on the shelf and wanted to get it running.
Airgap that is untouched, 950 carb, dinky 1 5/8 headers, 727, and a mismatched 4500 convertor
Car weighs 3300 and has been 117 mph thus far shifting it at exactly 6 grand. Crosses at about 6150. Bone stock shortblock, heads milled and thin gasket to achieve 10.5 compression
Not sure what 117@ 3300 is but its gotta be 500ish horse, and with a 904 and correct convertor i think it will run 119-120 pretty easily.
This build in this thread should make 550-575 even with the small cam, but those heads are mighty suspect.
Click to expand...


117@3300 is about 425-450 HP.
 
yellow rose said:
117@3300 is about 425-450 HP.
Click to expand...

I used the calculator on Moparts, which a lot of us have used forever, and it says 412.5 at the tire, not flywheel.
Have taken known times at the track and dyno and compared them and this calculator seems to be mighty close.
Example, my old car made 708 when Best Machine dynoed it. Ran 140@3200 pounds. Plug it into this same calculator and everything matches..... lol... who knows
 
Forgot to mention another example. Had a 71 Duster, i just sold this spring. Had it ultra sorted out.
The motor was actually pretty famous.... lol....you can see the build by googling " La Confidential Mopar"
It was an enginemasters motor that made 477 at the competition. I actually bought the dyno carb they ran it with and am in fact using it currently.
Last outing last fall we pulled all the belts off it and pushed it to the line, trying for an all time best( had the car 4 years) It went 114 with a 904 and the convertor was perfect. Trick little motor. Unless the enginemasters dyno was off 75-100 horse????
 
Had a 74 duster 340. 904 ran 114 also on a chassis dyno the best was 391 HP about 3300 lbs sounds s lot similar hope it helps
 
In my experience 117 mph @ that weight is 500-520 hp at the flywheel. Seldom is a chassis optimized. J.Rob
 
RAMM said:
In my experience 117 mph @ that weight is 500-520 hp at the flywheel. Seldom is a chassis optimized. J.Rob
Click to expand...

Agree. And because the convertor the car came with is way off, and the cam is too big, its a dog in the 60 foot. Best is 1.62 and car has been 11.39. Swapping to a low gear 904 over the winter, and tsking the 727 out, and the convertor will be correct for the combination. Should run 11 teens in good air at 119 or so. That isnt 425-450 horse or remotely close to it.
Had a ton of smallblocks over the years. 425-450 in a typical 3300 pound street strip car is 11.80's or so
 
RAMM said:
In my experience 117 mph @ that weight is 500-520 hp at the flywheel. Seldom is a chassis optimized. J.Rob
Click to expand...


I agree I have never seen the Wallace the dyno and the actual car mph ever match up in the real world .
 
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