w8less

i Just bought a 351w block and was going to get it bored over; how much should i do? does it help with hp any? i heard its just the like the necessary amount to clean up the block any truth to that? thanks for the help

hawkwitastang

Whenever most people rebuild an engine that they're trying to make stronger they usually bore it out since the opportunity is there, and yes engine boring does help with hp, because it increases your cubic inches.

saj1420

i would go 30 over, or .030" ... it will add about 5ci and still have very stong cylinder walls

JD1969

Correct, boring does not add a significant amount of displacement, but it can have a big impact on cylinder wall strength and the cooling efficiency of the engine. Go with smallest amount of overbore that will clean and straighten the cylinders.

vfast

just have it bored enough to clean up the wall....you can get .10 over pistons.....going 30 over might give you 10 hp.....while you have the block take it to a car wash or what ever and use a high pressure wash......pull out all the freeze plugs etc......have the block checked out for cracks etc before you put any machine work in it....remember you have to have the pistons before you bore and know what rings your using so you machinist knows what stone to finish the bores.....

mkspeed26

.030 should be good. have em cut it 20, check if the walls are good, and go as far as they need to to get the walls perf

w8less

ok thanks for all the help its going in the shop soon to be cleaned up and then bored over but i will talk to them to see what they recommend since when i get the money its going to be stroked to a 408 whenever the money allows me to do so cant wait