I've got a set of corvette alum L98 heads which have been slightly ported and polished. Nothing is really enlarged, just sorta smoothed out. Actually the intake ports are enlarged, but my Accel superram base isn't matched to it so that probably won't matter. The heads have got Manley Raceflo valves 2.00" in, 1.60 ex, and a 3 angle valve job. My setup also includes the Accel intake (previously mentioned) and Edlebrock TES. I've already selected and installed my cam. So now I've got the option of using 1.5 or 1.6 rockers. The lift will be .500 .510 with 1.5 and .533 .544 with 1.6. Which should I get? I want max hp, but I don't want to overdo it.

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91 Z28
Come see The Vicious...

 

Do you know if any work has been done to the valve guides? Find if they've been milled down or not. If yes, then go with 1.6's but I don't have the actual specs infront of me about the max lift on a stock height valve guide.

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, Jon (350 TBI!)
91 Red My website

 

The set I have left me with clearance for .517 lift, but not much more. .544 and you will be machining the guide down. The heads port stall somewhere in the .5 area depending on how much has been done to them, so going a whole lot more than that wont help much. I'd pick dependant upon if you want to do more work to the heads or not.

 

Well, the guy I bought them from said he had close to .600 lift on his vette so I shouldn't need to machine them, assuming he was telling the truth. His vette was supercharged too. The heads haven't been milled much. I had the machinist skim them so the head gasket'd seat better.