I building a forgen LS1 and i have 873 iron heads witch flow the same as 317 heads. My concern is putting iron heads on aluminum block and the motor being boosted. I know the that iron head don't dissipate heat as fast as aluminum heads. So what do you guys thunk?

Casting Number 873
Head: 1999-2000 LQ4 6.0 Liter Truck
Material: ***Cast Iron***
Part Number:
12561873
Combustion Chamber Volume: 71.06cc
Compression Ratio: 9.5:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

 

I think I'd look for a cheap set of 317's

 

+1 used to be able to get good used low mile 317's on ebay for about $250 when they were more abundant, and I'd assume that they're still inexpensive considering how the L92 setup is getting more and more popular.

 

X3, I would think that the hotter combustion chamber would limit you on timing, and in an FI application, timing is big power to lose.

 

Yah all the above..