4.8 to ls1

[ff_jeff]

Thanks. Good info, so stock for stock the 5.3 head would be better? Talked to my cousin and he picked up the 243s for me, for free. So as of rite now which ones will yield the most power in stock form? Saw your thread on ls1tech also, they were talking about putting the ls1 valves in the 5.3?

I would not run the stock 5.3 heads on the LS1. If the 243's are free, IMO I would either put them on, or Sell them for $500 and use the money to port the 5.3 heads.