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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Feb 2004 Posts: 29,756 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,756 | Does anybody have a specification handy for the crankshaft centerline to the top of the block measurement on a Chevy small block V8? I measured a 307 block, and it looks like it's about 9", but I'd like to confirm that guesstimate. I'm tinkering around with crankshaft strokes, rod lengths and piston compression heights on an altered-stroke engine design. Thanks!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Feb 2016 Posts: 1,982 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,982 | Standard deck height is 9.025" - 9.030"
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
| | | | | Joined: Feb 2004 Posts: 29,756 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,756 | Thanks! It looks like my guesstimate was pretty close! I'm figuring out connecting rod length and piston compression height for a 2.75" stroke small journal forged crankshaft (destroked 283) in a 305 block. 243 cubic inches with a slight overbore (3 3/4"). It looks like NASCAR H beam rods 6" long and pistons for an AMC/Jeep 258 engine will work with the stroke length I want. Lots of metal butchering involved- - - - -which I love to do!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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