350 questions

[Jnickell]

ok i got a 350 chevy .030 over and a stock bore 350 chevy but have flat tops for that now question is which one will have more power with i think a .480 cam and 1.94 heads??  im not shure which one to put together  some input would be nice

[Bowtie972]

How good of condition is either block?   Does the .030" block have high dome pistons or flattops? A freshly bored block with new rings and pistons will have excellent compression, the .030" over will  only give you  5 more cubic inches,  which isnt a huge difference.  Is the stock 350 low miles?..........................................



You say you have flatops for the stock 350.........have you had the bore checked for taper and out of round?


.......................350 - 355 I dont think you would notice a difference from one to the other comparibly built, I would use the one in better condition.   



One more thing... Are the heads fresh too? Dont put old heads on a fresh block and vise/versa, youll end up losing compression by the weak rings or weak valves.

[Jnickell]

both blocks in excelent shape stock 350 has about 55000 and .030 over block was redone and sat for long time then friend put it in but by then was full of water and took out bearings but block is nice..heads are fresh to

[Norm Henderson]

there wont be much difference in power, if you have the things to put the 355 together you might as well do it

[Bowtie972]

As long as the block is clean and still in good shape I'd go with the 355 then.  Throw a new oil pump in just  in case, cheap insurance.

[duel1985]

you really need to know what your cam is to be sure u get the best performance from your set up

[Jnickell]

ok thanks guys im goin with the 355