There is a awesome article in how to build big inch small blocks of this 371 ci engine! It's an engine built for Cascar in canada which is there little version of nascar. They took a 340 block and bored it 4.060 and took a 360 stock stroke 3.58 that has 340 mains and took 60 over 360 pistons which made this 371 ci engine! For the rules they can only run certian stuff like only 390 cfm carburetor. It does have a set of w2 heads. Only 10:1 compression with a 555 lift flat tappet cam. There is a bunch of other info that I am leaving out but the build is very mild. It made 521 hp at 6400 rpm and 472 lbs of tq at 5100 rpm!