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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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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: Nov 2005 Posts: 1,048 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 1,048 | I’m currently rebuilding my ’53 power glide 235. In the process we found the original head had 9 different cracks, so I purchased a ’60 head which now has been fitted with new valves, guides and hardened seats. I’m wondering if this later head will raise my compression ratio from the ’53 spec. of 7.5 to 1 to the ‘60 spec. of 8.25 to 1 | | | | | Joined: Feb 2004 Posts: 29,742 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,742 | Yes, the newer head will raise the compression ratio. If the casting number ends in "848", that's the best possible head to run on a 235, compression-wise. You might need to adjust the ignition timing to the later engine's specifications to take full advantage of the compression change.
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: Nov 2005 Posts: 1,048 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 1,048 | Thanks Jerry.
Yes the timing will be an adventure. The engine including cam and distributor are '53PG, and the flywheel is a '41. No telling where to set the "ball". I did check before I put the head on and found TDC. Using a little math the ball looks to be about 5 degrees before TDC. I plan to start there and slowly advance till I get a little ping when pulling hard in top gear
. | | | | | Joined: Dec 2008 Posts: 1,922 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 1,922 | till I get a little ping when pulling hard in top gear
Yup - that's better than the factory setting IMHO. | | |
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