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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: Aug 2011 Posts: 149 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2011 Posts: 149 | i know this has been posted somewhere,but i would like to ask again..has anyone used the crank shaft,rods,pistons out of the 292 and put into the 250? i happing to have 250 in my truck at this time.would the extra cubes&horse power be worth it.??? | | | | | Joined: Apr 2002 Posts: 1,571 Shop Shark | | Shop Shark Joined: Apr 2002 Posts: 1,571 | The 292 has a much taller deck, that will never work. There are other ways to get more power out of a 250, pick up the Chevy Inline Power Manual for ideas. Pistons that aren't designed for running something horrid like 83 octane gas help a lot, as do upgraded cams. | | | | | Joined: Nov 2002 Posts: 1,002 Shop Shark | | Shop Shark Joined: Nov 2002 Posts: 1,002 | Haven't done it. I have read that Clifford Engr. at one time had a very expensive kit to do it. There is a lot of machining that will have to go into the block. This project comes up every once in a while. The usual comments are too expensive for what little is to be gained.
Larry
I don't own a vehicle that isn't old enough to drink.
| | | | | Joined: Feb 2004 Posts: 29,771 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,771 | 307 Chevy V-8 pistons fit the 250 as a direct swap. They're flattop, while the 250's have a big dish in the piston crown. The head will also take a .050" milling job without getting into piston/valve interference problems. Combine those mods with a somewhat hotter cam, something in the 270 degree duration range, and it makes the 250 come alive.
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: Apr 2002 Posts: 1,571 Shop Shark | | Shop Shark Joined: Apr 2002 Posts: 1,571 | I have a nice set of .020" over 307 pistons socked away for that project. Four valve reliefs instead of a big dish should significantly help the compression. | | |
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