Our track champion, 5 years running, runs a 408 with IndyBrocks and a cast 4" crank. Burns E85 and runs 6.48 in the 1/8th. Hes the guy thats at the track everyday its open so it has 100's of passes on the engine. They are friends of ours and I asked him the other day if they had taken the engine apart since building it. He said he might inspect it over the winter but it has 5 seasons on it now....