Formulation of AMC cast iron

Omniloy, otherwise known as Anythinium......
You know, the Aluminasteel that builds up beneath the Bridgeport.....

WARBED wrote: Worked once again on my project Rambler. Finaly got all the accessories mounted Alt, A/C,  no P/S for now, had a heck of a time duo too the amount of different types of set ups that they make for the 2.5 and 4.0 engined. I have 4 different brackets to mount a compressor on and all are different. Alternator has the same issue but finally got it all together but had to relocate the idler pulley since no P/S. loads of room on the drivers side for something. Air compessor maybe?  Did install the starter. had to do a double take on the starter also. I have two also one is a chevy style with horizontle bolts and an attached soleniod the other is a Ford autolite style but has the head mounting part just like a cheby. Went with the Autolite Motorcraft style since it's original to the 2.5 Jeep engine.

The starter in that case depends on which flywheel you have. Carbed uses the Ford style with Chev nose and TBI uses the Chev style. Different ring gear offset (found out the hard way when I swapped an HO 2.5 from a Wrangler into my old '84 XJ 2 dr))

Noticed the different ring gears, I'm running automatic and using the ring gear off a 3.1 that is offset by the way the flexplate is stamped. the other ring gear is flat and uses a spacer to line up the gear,  Both starters engage the same and use the same diameter gear. So far so good.

CFD up till some time in 1976, maybe later?

CFD is Central Foundry Division General Motors.

And, add to that the iron mix that AMC used
is compatible to other GM engine block iron mixes.

The biggest difference may be in hardness.
The hardness is less to do with heat but
the use of "chill blocks" in the cooling process.

I didn't read this post but I worked on a set of 291C heads last week and they must have been very early castings.