Hello Guys, I need some help/advice/knowledge on my top end build. Mainly hoping some of you have experience with a build like this and can give me advice or info on what issues I may have or things I need to check etc etc. I have a stock LQ4 in my 84 corvette right now. I am acquiring all the parts for this build and so far, this is what I have:
Comp Cams 54-469-11 camshaft (231/247 @0.50, 0.617/0.624 lift, LSA 113)
.660 valve springs
Stock 243 heads (potentially milling them 0.020-0.030")
I would like to know if this combo will have any piston to valve clearance issues as it is. And also, whether or not I can mill these heads 0.020-0.030" and still not have piston to valve clearance issues. My goal being to raise the compression ratio of the engine somewhere between 10-11:1.
Any further recommendations are greatly appreciated as I am not hugely knowledgeable on these motors. Thank you in advance!!

 

I would be checking ptv clearance for sure...also depends on what head gasket you’re using....better safe than sorry. I milled my 243s down to get 60cc’s and ran a .040 cosmetic gaskets....cam had 630/615 lift and they would have kissed the pistons.

 

The intake duration and lsa are what's critical. With 231 and 113 you will be okay with stock unmilled heads. Now since you cant add back once you mill, I would go with thinner Cometic .040 gaskets and measure.