I was wondering what everyone on here would go with and for what reason. I plan on building a bullet proof 5.7" rod 383 engine with around 7.8-8.0:1 I am gonna purchase an ATI F1 blower for this combo and I need to decide on a cylinder head.

So far I am looking at

100% CNC AFR 195cc

100% CNC AFR 210cc

Trickflow R big port

Canfield 220cc

Dart Pro I's in 200cc

Any ideas or suggestions. I am leaning toward the AFR 210cc because of the strong exhaust side

 

AFR 210's

 

AFR 210's for sure. Out of curiosity, why dont you want to run a 6.0" rod?

 

Cause I was confused. I do want a 6.0" rod, I thought it was the other way around and the 5.7" rod put less strain on the side walls of the cylinders

 

Any of those heads are good, but what rpm range do you want to run in??? with a supercharger i would keep it down at lower rpms if its a street/strip application. Check out the vortecs and the fastburns they are bad *** heads and outflow afr's on the intake side, with little or no porting.!!

 

Wasn't aware of the flow numbers of the vortecs or fastburns. Correct me if I am wrong but isn't the most important thing for a blower car is to have a head that flows excellent on the exhaust side?

 

Don't waste your time. Go w/ AFR 210's.

 

Vortecs are good cylinder heads, but when you get into larger displacement motors like a 383/400, you will want larger intake runners on the cylinder heads to feed the motor, and frankly a 170cc intake runner will not feed a modified 383/400 naturally aspirated to its full potential, let alone a supercharged 383/400. He needs a cylinder head with larger ports like an AFR 210 to help feed a boosted 383/400.

 

I would go with the AFR210's......Vortecs and Fastburns are good.....but they are not Aluminum(except Fastburn alum)....Aluminum heads allow for more timing without detonation....and have better heat dissapating properties....all good things for a blower...especially if its NOT intercooled.

 

Fast burns are aluminum.

 

there were some fastburns that WERE cast iron.....

 

Even the prototype fast burns are Aluminum. You are probably thinking of the cast iron Vortec heads, which have a "fast burn" combustion chamber.

 

No...they dont make them anymore....but there were some Fastburns that were cast iron. Ive got an old GMPP catalog somewhere....If I can find it Ill scan the page or get the part number. I believe that they had a smaller intake port(180?) instead of the 210cc like the alum heads. I know the Vortec heads have the same shape...but they are 170cc. I will try to find that catalog

 

AFR210

 

i heard iron heads were better for turbo boost

 

Supposively the heat dissipation properties of aluminum help to prevent detonation. However, I don't think that the difference that aluminum heads make is as extreme as many would lead you to think. I know plenty of people running 11:1 on pump gas and cast iron heads, its all about the camshaft selection .

 

Aluminum heads are MUCH better for blown applications in that they dissipate heat better....which allows more boost/timing without detonation because of cylinder temperatures being less. Cast iron heads are fine for naturally aspirated motors.....I just wouldnt run them on a supercharged engine...cant speak for turbo's...not too familiar with them. And as far as running 11:1...why would you want to on a blown car?? The cam youd have to run with that wouldnt work very good in forced induction...because it would bleed off too much cylinder pressure....just my .02.

Correction on my post about some Fastburns being iron.....I misread the catalog..they are 18degree racing heads with "fastburn" chambers....but are cast iron...my fault

 

Porting is not critical in boost applications.. I'm partial to Dart Pro 1's