Which AFR head for 383
Thread Starter
Intermediate
Joined: Aug 2001
Posts: 41
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Which AFR head for 383
I decided to build a 383 street engine. I'll be using flat top pistons, probably a comp cams XE268 flat tappet hyd., Edelbrock Performer RPM intake with a Demon 750 vac sec carb. Can anyone suggest which AFR head would be the best match. I'm looking for 450+ torque and 400+HP with a flat torque curve for all around performance. Any other suggestions to the other components?
Thanks in advance
Thanks in advance
Le Mans Master
Joined: Apr 2001
Posts: 5,941
Likes: 281
From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
Re: Which AFR head for 383 (bungoo2u)
Move down to a demon 650 carb. The demons flow so much better your really need to take about 100 cfm off of the best holley to run. My friend had the 750 vs demon on his 383 with afr 190 heads and a nice roller cam, but always ran rich. He rejetted the demon, but it made no difference. When he swapped on a holley 750 the car ran fine. I just put a 625 road demon on my car and it ran rich with the settings from the factory. I have it adjusted about 1 turn out from stop on the four corners.
Mark B.
Mark B.
Pro
Joined: Jun 2001
Posts: 697
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From: College Station Tx
Re: Which AFR head for 383 (Sigforty)
I would start out with a 190cc head. I would suggest buying them as cast and having a competent porter assemble and port them though, even if you just do a normal cleanup with a bit of work.
Pro
Joined: Jun 2000
Posts: 698
Likes: 1
From: Park Ridge IL
Re: Which AFR head for 383 (bungoo2u)
I went with 190 and happy with them.
No porting or removing any material and they were bolted to the 383 with 10.5:1 cr and engine made 450 hp and 450 ptq. This was on the engine dyno in 90 deg weather on 93 octane gas with 750 carburetor and Performer RPM intake. Those are FW #s not rear wheel.
More info on my set up it's in my sig.
Ziggy
No porting or removing any material and they were bolted to the 383 with 10.5:1 cr and engine made 450 hp and 450 ptq. This was on the engine dyno in 90 deg weather on 93 octane gas with 750 carburetor and Performer RPM intake. Those are FW #s not rear wheel.
More info on my set up it's in my sig.
Ziggy
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Le Mans Master
Joined: Oct 2001
Posts: 5,302
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From: Atlanta GA
Re: Which AFR head for 383 (bungoo2u)
I read an article in super chevy (I think) that compared heads, AFR 190 being one. They made comments about every head, and said that the AFR is ideal for a stroker motor. I have 190s (intalling them on my short block today), but on a 350. It's overkill for now, but later on down the road when I do a stroker I will already have good heads for it. :cheers:
