5.0Notch

What do i need to do to make my 91 stang into a 306..do i need to do anything to the block and what parts i need thanks

kilgorq

Rebuild the motor and punch it out 0.030

mjr46

bore it out to .030 and buy pistons to fit it accordingly...actually you buy the pistons (.030) first with necessary rings and take it to a machine shop and that way they will measure the pistons and bore it to fit the pistons

86GT 93LX

how much of a gain is this worth??15hp? what? cant be much isnt this pretty standard on a rebuild of a wornout motor? how big can you go? on oversize bored?

mjr46

I have one of mine punched to .040 and you can punch them out to .060 but the side walls are gettin' pretty thin at that point and sometimes you run the risk of running a little warmer...cause the more metal removed from the cylinder walls takes away the motors ability to disipate heat more efficientlyaround the cylinders....but I have a few friends running motors at .060 with no real probs......I personally don't reccommend it

JohnnyK

You don't do it for horsepower, you do it because the cylinders need to be bored, and hence you need larger pistons.

AdderMk2

the HP is not worth the money it takes to do it.

going .030 overbore is for people whose cylinder walls are too far gone to clean up with a hone.

86GT 93LX

so ok adder on my motor based on my comp is mine needing a bore or just a hone?

AdderMk2

hone and rings minimum... but you wont know for sure until you run a bore meter through it and see if its still round...

over time, the cylinde bores will actually turn into ovals

86GT 93LX

[:'(]darn. maybe i should get a 351 again..that isnt half dead