On the older stuff the gears aren't usually marked(unless your real lucky).
You'll need to count the teeth
Chrysler/Force used different gear ratios on all motors until about 90 or 91
Then they used the same gear sets on everything from 90hp-150hp including the L-drive.
Try the starting fluid test: start motor, spray starting fluid around the intake side of the motor.
If the spraying makes a difference in the way it runs, then it's sucking air and needs work.
What's the rpm's in N ?
Should be 750-800 in gear in the water.
About 1100-1200 on the hose.
Compression?
These 2 cyl. motors can run on just one cylinder, make sure it's firing on both?
The factory doesn't really post the comp #s as they can vary so much.
The later models were actually designed with the top/bottom cyl. comp lower than the two middle ones.
The #s I remember are 155 #1/4 165 #2/3
I've seen the results as high as 175-180 on a 94 120
You sure it needs all those parts?
YEA!!!
I used an assortment of 2x10x12 blocks and just built them up to the right height.
Left the Cobra in either gear f/r, it changes gear to N when it slides all the way in.
