The Stovebolt Site Forums The Shop Area Engine Shop 261 versus 228 swap???

I'm looking at putting a 261 in the place of a smoking 228.I made some quick measurements of overall engine length and overall engine mount dimensions.I found that the gmc 228 is considerably longer than the 261 chevy.I'm really not sure how to proceed.If anyone has ever made this swap and could help me out it would be appreciated.If its going to cost me a bunch to adapt the chevy 261 to the gmc frame I might as well just do a ring job on the 228 gmc which is the original engine to this truck.I have a fenton intake exhaust setup that I could put on the 228 to fancy it up a bit.HELP

AFAIK, the GMC mill is about 1-3/4" longer than the Chev. six.
Since the GMC engine compartment is longer; you should not encounter any clearance problems with regard to the water pump and fan clearing the radiator.
Engine mounting is another thing.........you may have to fabricate a mount; since the GMC frame is different than a Chevy (they weren't "homogenized" until 1967).

I vote for a ring and bearing job for your 228 or find a 248,270 or 302 to bolt in.
Then you would have a "drop-in" situation .

Try Egge parts. They will send you a catalog and a free quote on the parts you need to save your 228.

Bob,

STAY GMC!!!!
The jimmy is a real TRUCK motor!
Anyway, I put a 261 in my '50 GMC 1/2 ton for awhile. It's not hard to do, just fab the front mount but you will have to cut a little out of the cross member to clear the front mount bolts. Personally, I'd stay GMC. Much better performance potential than the chevys (just look at the chamber). I'm puttin' a 302 in mine.

My .02