A: Different years of 4.0L (and different applications like TJ, YJ, XJ/MJ) have minor differences in external accessories. The '91 4.0L I measured this AM is 3" shorter than the one in my '87 Comanche. I think a custom built rad might fix the rest of it. Anyone near Seattle have an older Rambler that can be used for a test fit? From: farna@xxxxxxx Subject: Re: Fwd: My AMC NEEDS SPEED To: mail@xxxxxxxxxxxx Message-ID: <ADVANCES62BsQwY6YHk000002f4@xxxxxxxxxxxxxxxxxxxxxxx> On February 1, 2005 andrew hay wrote: > i don't have numbers but i've looked at both quite a bit. in a '64 - > no problem. '63 - still major surgery. > ________________________________________________________________________ > Andrew Hay I don't recall the exact length of the 195.6 and 4.0L either. The 4.0L is about 2" shorter than a 258 (fan and all, V-belt 258), but the engine bay of the 58-63 American is about 4" to short for the 232/258. There's no easy way to get more room either. The radiator can't be moved forward more than 1/2"-3/4" because of the hood latch. you can move to the rear by notching the firewall under the heater in the 61-63, but the heater box has to go. If it's a summer time hot rod that might be fine (no heater or defrost). Otherwise it would take a cobbled heater, maybe from a 59 or so Chevy truck (box under passenger side of dash IIRC), or a custom hot rod unit ($300 or so for heat and defrost only). Not worth it in my opinion. The GM 2.8L-3.4L V-6 (Ford 2.9L) is a good fit, but the accessories are mounted to wide! You'd need custom mounts. Even a modern four is to wide without surgery to the left inner wheel panel of the 58-63 -- the intake stick to far over! The 195.6 OHV is a nar! row engine, and the engine compartment of that car (50-55 Nash Rambler, 58-63 American) was built around it! May as well cut the humps on both sides and put in a small V-8 with block hugger headers or stock manifolds. Changing plugs will be a bear though.