Originally Posted By 340KID


we got the motor out yesterday and was able to get numbers off the back of block.. the numbers are P5249533. Is this a Merlin or CAT ? can't really find much info on this block casting ?


Block is newer than the heads. That is what Mopar sold as a 5" bore space "IHRA Mountain Motor" block. It's basically a Merlin. Designed for up to 800", capable of up to 4.8" bore, 10.72" deck.