565 cid

Thanks Fix . Why build a 540 when a 565 can be had . What combo of stroke and bore .

it depends on what year your engine is,some 502 blocks are thin and should not be boared more than .030 over,that being said,a std deck 9.800,with a 4.250 crank is 540 cu in,but if it is a thin wall block,if it needs to be boared bigger at rebuild time,you need a new block.and as far as 700+ hp from a pump gas 540,700 is pshing it,buy with the right parts itcan be done.imo,650 is more realistic,and safe.

I disagree mike, there is this guy in Texas that builds 540s.............

Ah, nevemind hahaa

Wish you were closer, my 575scis are coming out in a few weeks

Thanks Mike , if memory serves me my HP was built in 1998 . Is that good or not so good ?
Sorry about the hi-jack J boatman .

its the john deere green paint,good for 100+xtra hp

your 1998 is a gen 6,it is vastly improved over the gen 5 502 block,if you have a 454,it has a 4.250 bore and i am not knolegable on them.

nevermind

room forboring in case you score a cylinder but like mike said theirs certain blocks you can do it to..the block must be sonic tested first for thickness,,you have to keep the explosion contained in the cylinder,if the cylinder walls are to thin the it asts like a granade and then you know what happens ...

You should have the Gen VI block if thats the case. Thats better than the Gen V. Usually they can take a bit more boring, but overall a better foundation.

The very early merc 502 mags and HP465's, like 1990-1992 used Bowtie blocks, mark iv style. Those are good foundations.

IMO, when building, keep the bore size minimal to keep as much meat for future rebuilds. The extra .030 or .060 isnt gonna make magic happen. Sure maybe on some builds it might gain 10,15, 20hp, but theres better ways to find that power without compromising the integrity of the block, unless mandatory.