Thread: how much more horse power do you get when you bore a engine.060

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Will ur horse-power increase when you bore a engine .060 ???

So little that it would be hard to measure. All it will do is clean up bore and promote better ring seal, which will increase hp slightly, especially if engine had ring seal problems to start with.


Don

I was curious this was a virgin engine and i bored it .060

Don's answer is right....it will be such a small amount. However, if you
canunlock 100 of the "small amounts" then you have a noticeable amount.

This is why some builders bore a new block....they're searching for tiny gains that will add up. Maybe they index the crank to a tighter tolerance, maybe they run the deck clearance just a tad tigher, maybe they improve the head flow by 1/2 percent.....they're looking for every bit that they can gain. For a street engine (regardless of how "racing" that it is), your street variables are too big (plug condition, fuel quality, jetting.

Dont waste the effort to bore a street engine until it needs to be bored

I think that the NO votes really mean that you wont get any appreciable horsepower increase......of course you will get some

ok i will clairfy,on the pole!
how much more horse power do you think you will get if you bore a virgin 350 chevy block to .060
thanks guys!

how much more horse power will you get if you take off the water pu8mp fan and replace it with electric fans?

yes a 454 out to 468 the 468 run good but why stop there ? for a mild build i would look at some things that make more hp. some engines can take 0.100 over but this the over bore is off set by the walls moving around and the rings not sealing up from thin bores and some engine can not go to .060 so i would say to get any thing you would have to go to .060 and past .there is not to many blocks that you can do this to on bow ties big blocks i have bore them .250 over for a4.500 bore and have gone to 4.600 but they are heavy blocks same with the dart blocks and world blocks

Both boring the block 060 and an elesctric fan would take a dyno to measure the horsepower difference. Best horsepower gains are in the heads, cam, and machine work....ie correct quench, clearances, piston to bore fit, hone finish, and a ton of other little things.

a good roller cam .a good oilpan to keep oil roping the crank a cold air package a lighter mass and some head work intake and headers ex and you could get from any of them same or more then a bore the rigth push rod length and like said piston fit to wall and pin fit and deck for quench tru deck to cam and mains and plate honed ? we do all this any ways rigth?

You also get a slight compression increase. I think .060 will give .2-.3 increase.

I routinely bore mine the max. I know good and damn well I won't be doing it again.

Originally Posted by sparky2263

You also get a slight compression increase. I think .060 will give .2-.3 increase.

I routinely bore mine the max. I know good and damn well I won't be doing it again.

ok well then get out the sleeves

With good blocks getting harder to find every day, it makes me so mad when someone bores a perfectly good block .060 over. If you even scratch a cylinder wall, the block is trashed. When I built my engine, I bought a standard bore block and went .020 over. I can rebuild it again at .040 over and again at .060 over. I should get a lot of life out of this block. If I went .030 over on the first bore, I would only have one more rebuild in it.

Originally Posted by DennyW

I agree, but, sometimes .020 will not clean up the bore.

and some times when you tru-deck .030 will not get it from the deck being off and with the bore holes to

More ci = more air = more fuel to feed it = more horespower. Can you "feel it". Only if you have a good imagination or an engine dyno handy.

It's all those other little things such as a better camshaft, higher output ignition, freer flowing exhaust and cleaned up heads and valve train will there be any appeciable "feeling" or actual real gain.

I do agree with the other folks about over boring a hard to find block - which is why I have 2 early (high nickel ?) 351 SB Ford blocks squirreled away