If you're around a marina, you might get a deal on a Mercruiser 4-banger. I have a 181 ci Mercruiser in my Model A. It is a Mercruiser-revised Chevy II block, bored and stroked to 181 inches. They have Chevy V-/I-6 belhousing flanges. There is also a 153 ci versoin of the Mercruiser engines...they're identical to the Chevy II 4-bangers, but have different intakes and exhausts. You have to junk the intake and exhausts from boats...no good for street. Jeep, AMC and postal Jeeps, all used the Iron duke engines and some Chevy II versions at one time.....with the V8/I-6 belhousing flanges. Some postal Jeeps even had some Torque-flight transmissions in 'em! Early S-10s, the ones identified as 2.5 Liter, used them before switching to the smaller flanges. Don't remember when they switched, though. Personally, I like the '62-'70 153's best, because they had more meat in the block. I doubt if you could bore the thin-walled 151 ci engines more than about .020!
