what engine?

[175 Ranger]

How do I tell what motor my 75 cherokee s has in it? I've had 3 fsj's with 360's and none had this much power, but all of them were mid 80's SMOG CHOKED engines as well. so I just want to know if this is a 360 or 401. thanks

[Cecil14]

Easiest way is the vin. A z in there will indicate a 401, can't remember the other motor letters off the top of my head. The other way is to check the block. On either side of the block just under the exhaust manifold will be (or should be) stamped the size of the motor. Now if it's not an AMC it, obviously, won't be there. Also possible that it's not an AMC? Swaps are common but it sounds like you've seen a couple before. smile.gif

Anthony

[joe]

360 or 401 will cast into the block above/behind the motor mounts.

[AMX factor]

Cubis is casted into block on both sides rigth behind motor mount so you'll have to climb under with a flashlight. Also if you have the intake manifold off it's cast into the block in the center by the lifter bores near the front of the motor. You might still have a 360 as the 70's 360's were pretty healthy motors.

[Elliott]

Originally posted by Cecil14:
Easiest way is the vin. A z in there will indicate a 401, can't remember the other motor letters off the top of my head. The other way is to check the block. On either side of the block just under the exhaust manifold will be (or should be) stamped the size of the motor. Now if it's not an AMC it, obviously, won't be there. Also possible that it's not an AMC? Swaps are common but it sounds like you've seen a couple before. smile.gif

AnthonyThe service blocks did not have numbers stamped on the side of the block, so that's not neccessarily a give away.

[J10/J20 Project]

Best way is check the block, it is behind the motor mounts. as stated above. Someone could of replaced it. Just chech the block then you know for sure.

[ February 29, 2004, 07:20 AM: Message edited by: J10/J20 Project ]

[J20 project]

Elliot, What are you calling service blocks? A crate motor like I have? Mine was originally cast as normal but the 401 was ground off at the factory due to some weird regulations.
J20

[Cecil14]

Originally posted by Elliott:
The service blocks did not have numbers stamped on the side of the block, so that's not neccessarily a give away.Right, those were my other thought, just forgot to add them in.

J20 project: the factory replacement blocks (the ones AMC dealers used for warranties and other replacements) were bare. They didn't have any numbers for some reason.

Anthony

[Elliott]

Originally posted by J20 project:
Elliot, What are you calling service blocks? A crate motor like I have? Mine was originally cast as normal but the 401 was ground off at the factory due to some weird regulations.
J20The factory built (forgive me if I am not a completly accurate historian) a thick wall service block that could be bored to any of the replacement cubic inch blocks. I believe they were a spin off of the racing blocks. They were not numbered (have an article on it all somewhere if interested).

OK, here's the skinny:
http://home.att.net/~farna/amtech/engines.html#V-8
"The cubic inch size of all GEN-2 and GEN-3 engines is cast into each side of the block just behind the engine mount plates in the center of the engine. An exception is the 1970 thick cast 360 which was used in some Donohue Javelins to homologate the thick wall 360 block for Trans-Am racing. These were also used as service replacement engines. They are essentially a 401 casting (they have the same casting number as the 401) with a 360 bore. This block could be bored to 360 or 401 specs, hence its use as a service replacement, and why it didn't have to be used in all the 1970 Donohue Javelins. Homologation wasn't required because it was a standard service part, not a race only item."

[ February 29, 2004, 09:53 AM: Message edited by: Elliott ]

[joe]

Originally posted by Elliott:
The factory built (forgive me if I am not a completly accurate historian) a thick wall service block that could be bored to any of the replacement cubic inch blocks. I believe they were a spin off of the racing blocks. They were not numbered (have an article on it all somewhere if interested).I didn't know the details of the factory replacement blocks but Elliot is correct that they don't have the CID cast into them.

[J20 project]

Hmm, Interesting, I haven't heard of these. Never professed to be an AMC guru though. I found out that mine was a 71 crate motor sold out here in the western US for pump, generator, etc type applications and that the 401 was ground off due to some regulatory stuff. I got this info from american performance products out of florida. J20

[Elliott]

Originally posted by J20 project:
Hmm, Interesting, I haven't heard of these. Never professed to be an AMC guru though. I found out that mine was a 71 crate motor sold out here in the western US for pump, generator, etc type applications and that the 401 was ground off due to some regulatory stuff. I got this info from american performance products out of florida. J20I'd be interested to know if your block did actually have the CI numbers ground off, you should be able to tell casting roughness from grinder smoothness. Don't know what regulation anyone would care what the CI of a generator motor is, doubt they even do emmissions in CA for that application. I'd speculate that's a service block, being a factory crate motor would lead me to think you won't find grinder marks around the engine mount.
Makes me wonder if the IH 401 were a service block or if they had the 401 cast in?

[Bambi]

I have had several AMC motors with no casting ci on them and also one 401 block that was cast JEEP where the ci would have been. also one 360 and 0ne 343 with the numbers upside down.