According to Keith Craft power should be limited to no more than 625 hp, with or without a girdle. If you're going to mess with 4 bolt mains, then why not step up to a sportsman block and get the extra strength?
im building a 408 with the Eagle bottom end kit with the forged crank and h-beam rods... internally balanced....with a 200 shot...........i can get a '74 block from my buddy for free are those good blocks.
'74 is a good block. I would use ARP head and main studs good gaskets. -Think about a half fill with hard block. Main girdle couldn't hurt.
Build the hell out of your cooling system.
If built right, a stock 351w will surprise folks with its strength. Im going to be pushing 600 fwhp on my stock crank '78 block. I have good rods, good studs, good cooling/oiling system. I built it myself, and I know it was built pretty good. Block strength isnt worrying me at all.
Look at toohighpsi.com That guy takes stock truck 351's, throws rings and bearings in them, reusing the stock rods and CAST pistons-then runs 10's with them. He hasnt melted a piston, (he has blown a stock rod or two). Stock crank and block live.....
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