Hey How many rpms do big blocks turn

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So stock small blocks and stock big blocks spin around the same speed

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I should add that this is with aftermarket rods,light pistons and a good balance job.

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How do big blocks run on cyl wall thickness, are they as hit or miss as small blocks , are the castings thicker per unit of bore dia? How hard is it to install cross bolted main caps in a b engine?

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Wall thick, yes, They are hit and miss. Plenty of chances for core shift here too

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I guess you guys see where this post is heading , been pricing out race blocks today and for the bucks a 451 B engine build sounds hard to beat , I just assumed there was a rpm advantage to small blocks but once ya add a little stroke it all seems to even out, lots of good reading on B engine builds just never looked till now

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Its just the way you build them and with the right
parts. I'm in the process of building a 514 BB that
I expect to turn to 9000... good balance and light
parts

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Wow some of you really twist them bigblocks ! The 440 in my 63 is a stock shortblock with KB quench pad pistons so I could get quench with the factory 906 heads I run. That way it runs good on 92 pump at 10.0. I shift between 6000 and 6200 and trap around 6400 according to my tach. I guess the aftermarket heads wake them up more then I realized as I have never ran nothing but stock heads. But now that I am single I plan to build a nice aluminum head eng soon. Ron

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from past experiance do not turn kb hypertechs above 7100-7200 or you will be picking pistons out of the pan

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The current low deck 440 Super Stock engine that I’m running makes power @8500… shift it there and go thru the lights there.

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that's turning it up... I'd like to see that thing run.

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thats like asking how high does the tide get

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I can answer that , It depends on how hard the wind blows, Any how I am happy to see that the mopar guys at the factory remembered the rest of the head bolts on big blocks and the deep skirt @ the crank looks better for high load apps, are the factory big blocks as far out of machine spec as all the 360s I measured?

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The current low deck 440 Super Stock engine that I’m running makes power @8500… shift it there and go thru the lights there.

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thats like asking how high does the tide get

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I can answer that , It depends on how hard the wind blows,

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thats like asking how high does the tide get

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I can answer that , It depends on how hard the wind blows,

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close. there are lots of factors. Moon phase, storm activity, winds, etc. and the answer to this question is even more complex but still the same. it depends on what you built.

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For sure,It all depends on what parts you use.


This cast KB motor has been 10400 more than once. It will break valve springs at that RPM but the bottem end lives for any run. I shift it at 9800 and it is real easy to over rev to 10K+ in a split sec. BTW the bob weight on this one is 2250 3.750 stroke 451".500 low deck. Built for RPM, cam makes power from 8800-9800 RPM with 60# of boost. Have two complete motors sitting here.