I'm building a L98 from a 89 vette. I've read about able to use 2.00 intake valves and 1.5x exhaust without changing valve seats. I have ls1 valves laying around. Is there a valve guide kit for the 8mm LS1 stems vs the sbc 11/32 ??
Do I have to buy a kit altogether? ,
If you have upgrade to bigger valves, do you have a write-up and parts list?

Cam wise, I'm not looking to go bigger than lt4 or .530 lift. I have the p# 787-16 comp cam .050 offset valve locks and with be running LS3 blue valve springs that I was originally gonna go with using on L31 iron vortec heads. But I want to keep aluminum heads for the heat disbursing characteristics and lightweight design. I have already started pouring the entire TPI system including the Siamese'ing the tb opening and were the runners bolt up to on the upper plenum. Also doing same to the flanges on the runners and taking some material off the inside of runner tubes as far as I can reach. Next I am opening up the lower intake manifold. Not Siamese'ing the lower.
I will be porting the heads.
Any extra tips with the L98 motor welcomed. First sbc gen 1 or 2 I've touched to build in over s decade.

Thanks in advance...