i just bought my iroc and i pulled my valve cover and i cant figure out what brand or size the heads are. It has a W in the top left corner and a few other numbers around there like a big 95 and a NH l18 and 1-037 any help would b appreciated

 

W stands for World Products
I-037 designates they are World Sportsman heads, and are 200cc runners.
NH is New Haven foundry which is out of business ( were cast at several different foundries ,unique identifier for each one )
Most were 64cc combustion chamber with a 2.02-2.05 valve.

One of the best heads available in their day ( 1987 )
Originally sold as "Dart II" heads but World Products no longer connected with Dart
Still popular today for class racing where a " stock " cast iron head has to be used
Specs
http://www.silvesterv8.co.nz/product...ron-Heads-64cc

http://www.worldcastings.com/product...ron-heads.html

 

thanks for the info any suggestions for a camshaft size for mainly street driving with some good power with the tpi and 11.5 to 1 compression

 

Out of curiosity, how are you managing to get that up to 11.5:1 to CR?

Stock TPI - or any upgrades?
Exhaust upgrades yet?

 

well i bought the car the way it is and the motor is built sky high and i wanna get a little smaller cam and the tpi has a bbk 52 mm throttle body and 30lbs injectors and they put manifolds on for inspection but has 4 inch exhaust the rest of the way back so i was just gonna put headers back on it