Displacement: 383 cu. in.
Carburetor: Holley 750 double pumper
Heads: Air Flow Research 190cc Street
Intake: Air Flow Research FloPower RPM
Camshaft: Comp Cams hydraulic roller, with 236/242° of duration @ 0.050 in. lift, and 0.520/0.540 in. lift
Headers: 1 3/4 in.
Distributor: MSD
Timing: 34°
Comp. Ratio: 9.5:1

MAX HP: 503 @ 5500
MAX Torque: 517 @ 4500

Crate engine supplier quote

the afr 190s nor will the cam make the 500hp level in comp up to 11 to1 , to make the actual hp #s which are probably overinflated from another source you need 555 lift 246 dur at 050 10 .8 to 1 and afr 210 bandit heads ,brodix track 1,dart 215s ,or canfield 220s,hope this helps,you will find most places will sell more engines by boosting there power #s ,we are dead on accurate,your combo as spsecified will make 434hp no matter what afr or anyone wants to say. :smash:

What do you guys think? :confused:

 

There is NO WAY that this setup makes that much horsepower.. It has to be closer to 450 HP...

 

Probably closer to 400 even. no way it'll make 503, especially with that compression ratio. I have an iron-head 11:1 355, similar cam and intake specs, and it's around 410. Switch to aluminum would probably net me almost 100hp because of the compression and timing adjustments I could make, but that's running a full 1.5 points higher.

 

I would be surprised if such a combination would make more power than a new LS6.

Chuck

 

Rarely do build-up articles in rags or crate motor specs quote exactly what FUEL was used during dyno. For example, there is an often referred to article in HRM about building up a GMPP HT383 ... nowhere does it state what fuel used. I contacted author David Freiburger and he told me they used 76 brand 91 octane. As for other references ... I'll bet dollars to donuts that alota the big hp/dyno numbers were attained with 110 octane race gas.

 

Well - I have 215cc heads, a ported and matched intake and a solid cam with following specs:

.525/.540 lift and 238/248 degrees .050 duration .. and the engine makes somewhere in the high 400's...
My numbers are backed up by dyno runs and 1/4 mile passes...

 

I could be wrong, but I have a slightly different opinion.
Race gas on it's own will not make HP. The advantage of race gas in you can run higher comp ratio and more timing without detonation. If comp ratio and timing are known, the race gas part of the equation does not make much difference.

I ran a circle track car with 110 race gas and 90 pump gas. Didn't dyno it but it felt the same. Until I moved the timing to ~ 39 degrees with race gas and felt the improvment.

 

I pulled the number from: http://www.airflowresearch.com/ http://www.ryanscarpage.50megs.com/combos3.html

I guess those numbers are wrong. I emailed AFR concerning the numbers yesterday and as of yet not received a reply. :smash:

 

Check out these dynoed engines: http://www.geocities.com/MotorCity/7610/dyno.htm

And this magazine article: http://www.carcraft.com/techarticles/68999/index.html

Its possible, but it needs to be set up and tuned very well. 500 hp is about the maximum you're going to get out of a "streetable" N/A 383. You would probably want to get the heads(or any heads really) ported somewhat to maximize their potential.

 

Setup on an engine dyno with forced air induction, stepped headers, no waterpump, alternator etc. it is possible :D