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Synchro909 · 03-21-2024, 07:28 PM

The Model B engines are more prone to cracking than the A engines so before you make any decisions, I suggest you have the B engine crack tested. If it is sound, it will be a decent upgrade. The Model A engine put out 40 hp, the B put out 50 so instantly, you have an extra 10 hp. There are B engines and there are B engines. The early ones had no counter weights on the crank shaft, the later ones did so if you can, opt for one of those. Both versions have a stronger bottom end to them - bigger journals and pressure lubrication to the main bearings.
As for the B engine fitting the A transmission, you will have to cut the bottom half on the flywheel housing off the sump (pan) and fit an A flywheel housing. Then, it will bolt right up.

03-21-2024, 07:28 PM	#2
Synchro909 Senior Member Join Date: Jun 2014 Location: Melbourne, Australia Posts: 7,526	Re: Model B engine in an A The Model B engines are more prone to cracking than the A engines so before you make any decisions, I suggest you have the B engine crack tested. If it is sound, it will be a decent upgrade. The Model A engine put out 40 hp, the B put out 50 so instantly, you have an extra 10 hp. There are B engines and there are B engines. The early ones had no counter weights on the crank shaft, the later ones did so if you can, opt for one of those. Both versions have a stronger bottom end to them - bigger journals and pressure lubrication to the main bearings. As for the B engine fitting the A transmission, you will have to cut the bottom half on the flywheel housing off the sump (pan) and fit an A flywheel housing. Then, it will bolt right up. __________________ I'm part of the only ever generation with an analogue childhood and a digital adulthood. Last edited by Synchro909; 03-22-2024 at 02:58 PM.