Kane Posted March 5, 2011 Share Posted March 5, 2011 I have a 1970 Monte Carlo I recently bought It has a late 69 Corvette 350/4 bolt main with 64cc chamber power pack heads. I'm tearing it down to rebuild it to a mild street/strip engine. As I got down to the block I notice the piston stamp showing 040 So, this block been bore. I'm newbie to high performance stuff. My question is since the block been bore what is the displacement size now for the engine. Thanks in advance guys. Quote Link to comment Share on other sites More sharing options...
Winston Wolf Posted March 6, 2011 Share Posted March 6, 2011 357 cubic inches. Quote Link to comment Share on other sites More sharing options...
bigscaht Posted March 11, 2011 Share Posted March 11, 2011 ahhh thats a cool question....i got a 355..which is a 350 .030 over..math can sometimes be cool...lol Quote Link to comment Share on other sites More sharing options...
robs70monte Posted March 11, 2011 Share Posted March 11, 2011 I found out that the po had my 350 bored .060 over what's that make it I'm not much of a math guy my self Quote Link to comment Share on other sites More sharing options...
bigscaht Posted March 11, 2011 Share Posted March 11, 2011 im gonna guess a 360????????? i didnt do the equation! Quote Link to comment Share on other sites More sharing options...
bigscaht Posted March 11, 2011 Share Posted March 11, 2011 hahahaha im pretty good at math..I jus did the equation and it would be a 360..actually a 360.4 Â the equation is bore x bore x stroke x .7853982 x 8(# of cyl's) Â COOL!!!!!!!!!!!!! its funny cuz a 350 is actually a 349.84 ..... lol Quote Link to comment Share on other sites More sharing options...
robs70monte Posted March 11, 2011 Share Posted March 11, 2011 Thanks so what's the max you can take a over bore 350 is it like the big chevys if you get a bow tie block the bore is thicker and thare for can be bored larger Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted March 11, 2011 Share Posted March 11, 2011 Max overbore on a small block 350 is .060. on later blocks even that is marginal. bow tie small blocks with siamesed cylinders can go 4.155 You say that you have power pack heads, that was a hot head in the early sixties for 283s not so hot anymore Quote Link to comment Share on other sites More sharing options...
Mo's70MCs Posted March 11, 2011 Share Posted March 11, 2011 69 Corvette 350/4 bolt main with 64cc chamber power pack heads. Iron small block Chevy heads are extremely durable, but even these pieces will crack. There are later-model, lighter-weight castings that are decent. Most hot rodders do everything on a budget, I know I do & have done so. Few of us have the resources to buy a new block or heads every time we build an engine. So we start with the older stuff that's either well used or that others have tried. More often the history of said castings is documented in numbers, but never a history of running time if you will.. IMO "If you're planning on machining (building) a used block or heads.. make sure the very first thing you do is check for cracks". Usually 25% of blocks received for machining are normally cracked!! Those are pretty high numbers. Starting in the lifter valley where they're are really prone, I guess my point make sure your castings are fine before jumping the gun..ask me how I know. The more machining the weaker the casting! Quote Link to comment Share on other sites More sharing options...
robs70monte Posted March 11, 2011 Share Posted March 11, 2011 Been there done that I did up a set of 416 305 heads screw in studs 1.94/1.60 valves new valves tons of time in porting and in the end there was a crack in the chamber but luckly for me I did all the work on the books at work for my self still sucked in the end all ways check for CRACKS Quote Link to comment Share on other sites More sharing options...
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