OK, so now the question is, what piston do I need? The other 5 original cylinders to the engine say KS, are alusil, are height group 6 and size 0. The one that broke, and was from a different set, was a Mahle piston with a mahle cylinder. this is causing me issues as I do not know what compression ratio piston I need for my 1973.5 2.7L US engine. The two that this one guy is offering me are 90202 or 90208. Which should I take? He also said that a 1973.5 /6 was a 2.4 CIS engine. I think that is incorrect as I have never seen such a beast. MFI yes, CIS no.

true statement

Lernt something today. I am pretty sure it is a 2.7, though and I still need the answer to my question about what piston to get from him. Any ideas, Jeff?

90208 KS 2.7

As always, thanks for your continued help You da man

Hey Mike,

The 73.5 WAS a 2.4...I have one and it is a 2.4....it also has the 7R case (hence why I bought it)....

2.4 WITH CIS? I know that the 2.7 started in 74, I got this engine from a 74, but some of the CIS bits are the earlier bits and why I think it is an early 2.7.

73 had a split between MFI and CIS for the T model, hence 73.5 CIS 2.4
they had steel runner tubes

Ah, I have the cast aluminum tubes. I do have an extra setup with the steel tubes.

Another thread based on speculation.

It's not very important whether 73.5 was a 2.4 CIS if you have a cluster-fuched 2.7. Measure those things. If you hurry, and you have no calipers, you can buy some from FLAPs before they close.

GO GO GO!

Feel free not to respond to my threads, alfalfa.

What size were the jugs on the 2.4? I know I have 90mm which are the 2.7 so I am not worried about that. I was just wondering if I had the right CIS as well.

check the PN on the fuel distributor.

The p/n is right. I found the size for 2.4 as well, 86mm.

84mm

Strike!

Hey Jeff, would I be correct in thinking that the number you recommended is the lower CR 8:1 74 2.7 piston?

Your right.