Got the zz4 cam yesterday. Was wondering on what size intake and exaust sizes I should go with on the heads. Cam specs are Dur@.050 208intake,221 exhaust. Lift .474" intake .510" exhaust. I'm going to use 1.6 roller rockers so I know the lift will increase. I was thinkinking of going w/2.02/1.60 inch intake and exaust valves and machine them down to 2.00/1.56. What do guys think? What kind of valve springs and roller rockers should I use?

 

You need to get the Valve Guides Cut on the heads to accomodate the more then .480 lift w/o some serious isssues of two things trying to occupy the same space at the same time.

 

Don't put that much money in L98 case iron heads they're not worth it.

 

Why not use the iron heads? They can flow just as good as the aluminum vette heads.

 

Who says the iron heads are no good? with a little work, they can do pretty well. Check this thread out.
https://www.thirdgen.org/techbb2/sho...n+head+project