AC B Engine Overhaul

coxtavrn · Jun 7, 2020

Fixin to have my B's engine rebuilt. I'd like to increase power, but I've read where there isn't much you can do - just porting the intake valves and using a D15 governor spring. Any thoughts?

4wdtom · Jun 7, 2020

I think a lot of the rebuild kits you get are 1/8" over bore and they well have higher compression pistons but I am not sure of that. With a fresh engine and the over bore kit you should have plenty of power.

Dick L · Jun 8, 2020

You can have the head milled .150 to increase the compression. I have taken .200 on one without a problem. Chevy small block valves along with porting for easier air flow.
Here's one with .150 milled off and Chevy valves with the ports opened up and polished some.

Aaron SEIA · Jun 9, 2020

An easy one to do if it'd work is use D14 or D15 parts. Then you'd go from 125 to 149 cubes. I do not know if the sleeves and crank would fit the B block though.
AaronSEIA

Nordic · Jun 9, 2020

If you can find a 149 cubic inch engine to put in, you will noticeably increase your power. I gave my Dad a 149 that he put in his B. With oversize rear tires he can plow snow up a long steep hill while running in third gear, impossible with the 125. It takes a few modifications but not too bad.

AC B Engine Overhaul

coxtavrn

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4wdtom

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Dick L

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Aaron SEIA

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Nordic

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