Posted by Hal/Eastern WA on July 28, 2012 at 17:54:40 from (71.32.10.111):
In Reply to: continental engine posted by Downey on July 26, 2012 at 15:07:48:
No experience with Continental engines, but probably you shouldn"t bore a block larger than necessary for the available oversize pistons you can find.
Lots of engines can be bored out quite a bit, but anytime you go real big, you risk leaving yourself with too thin of a cylinder wall, or even hitting a water jacket. Then you find another block and start over, or go through the expensive custom sleeving process.
When I was in high school, the popular modification of a 283 Chevy was to bore it out to 4", making it into a 301. Usually it worked just fine and it produced a very powerful engine (with the right heads and other parts). But sometimes it didn"t work out at all, and it was almost impossible to get and keep ring seal.
Chevrolet built a very similar engine for the 1967 Z-28 (and to comply with the Trans-Am racing rules) using a 4" bore 327 block and a 283 crank, along with the best heads, cam and induction. They called it a 302 and it was an absolute screamer. I don"t remember ever hearing about problems with those cylinder castings being too thin like they sometimes were on 301"s.
It might work to bore out the Continental engine, but modifying anything very much is taking a chance. Good luck!
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