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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 2021 Posts: 3 Moderated | | Moderated Joined: Aug 2021 Posts: 3 | We’ve got a 1946 gmc EC152 with a factory 228 in it. What can I do to get a little more performance out of it? Has anyone bored one out? We’ve rebuilt the carb, adjusted the valves, etc. it idles great, but seems to bog down a bit when you really ask it. Any help or ideas would be appreciated. | | | | | Joined: Mar 2000 Posts: 1,177 Red dot, center of chest ... | | Red dot, center of chest ... Joined: Mar 2000 Posts: 1,177 | I had my 235 bored .030 over and put a cam in it. Also got a better intake and headers. It made a noticeable difference in performance. | | | | | Joined: Dec 2008 Posts: 1,922 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 1,922 | Sorry, big $$$ gains little power | | | | | Joined: Aug 2005 Posts: 6,377 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,377 | Cheap and easy. Won't gain a lot but it costs nothing. If you're timed to stock specs, those specs were set for about 65 octane gas. Leave your timing light in the drawer. Warm your truck up then time to fastest/smoothest idle and lock it down. Re set your idle then take it for a spin. If it doesn't ping under load or drag the starter you're good to go. You should be able to advance your timing at least 10 degrees. It made a noticeable difference in my 38.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
| | | | | Joined: Feb 2004 Posts: 29,749 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,749 | "There's no replacement for displacement". All the GMC sixes are pretty much bolt-in swaps. Find a 248, 270, or 302 to swap for the 228. GMC engines are scarce and expensive to modify, since most of them were used, abused, and and destroyed back in the 1950's and 60's by dirt track racers, drag racers, and Bonneville land speed record runs. The days of having thousands of WW II military surplus 270's and a few military 302's from the 1950's are distant memories. There's a small group of hard core GMC hotrodders still out there, but it's a pretty exclusive bunch.
Chevy 235 and 261 sixes are much more common, less expensive, and they share the same bell housing bolt pattern and a lot of other bits and pieces with the GMC's. The "go fast" parts for Chevy engines are also a lot less pricey than the same stuff for GMC engines.
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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