5.0kid

im looking into buying a motor from a fellow buddys friend and the block is .60 over its a 1970 windsor block the combo has gone 8.50s on a 250 shot the only thing worrying me is if .60 is pushing it when it comes to cylinder wall thickness.

.boB

For racing, yes, it's pushing it a bit. The big thing is to make sure your cooling system is much bigger than you think it needs to be. Excess heat can kill it.

5.0kid

its gonna be a quarter mile mule will not likely see full operating temp at any time so i think im ok with my fluidyne radiator and electric fans. so maybe buy the motor and look to invest into a boss 351 and punch it to .60 over to be safe?

.boB

If you're going to invest in a Boss block, why not punch it out a lot more? Max is 4.125" Bigger is better.

5.0kid

so i can have some meat if i score a cylinder for it to be bored a few times

uedlose

it maybe just fine and then maybe not. Take it to a machine shop and have it sonic checked for thickness and see what they say I have heard of them gone over .060 with the older blocks.

wildcobrar

If it is a stock block and .060 over bore and has alot of running on it you may not wish to buy it. Wear = taper and it will need to be bored more to straighten it out.

Personally, i do not buy anything in stock blocks that are .060 over. The only way I will take one is if it is given to me. It is a crap shoot for rebuilding it.

If it is a running engine and no blow-by and good compression and leak down test is good. Then maybe it would be a decent buy.

Joe

.boB

Consider a Dart block. Pretty much the same money, and certainly a high quality/well known product. 4.125 is minimum, with another .060" if you need it later. Couple that with a 4.000 stroke crank, and it will easily run to 7,500 rpm's.

GTnotchback

uhh my engine is .060 over on my block in my sig. Why is that a problem? am i missing somthing. i had it done @ .060 right when is was brand new.