On my motorhome with a 460 carb, I had to tear the heads of it as it had the famous broken exhaust bolt..So while it was torn down that far I also put it a crower 22239 cam in as I was a bit afraid of the 22240 for smog reasons..A new roller timing chain and a full Banks system..Wow,what a difference with that 14000lb motorhome ..now I fear nothing when it comes to passing and hill climbing