[Milehighmopar]

Hi all, I’m trying to find out if the 383 Engine in my 71 Cuda has the 9.5 or the 8.5 compression. The block casting is 2468130 dated 9-11-70 the heads are 2843906. Not a numbers matching car and couldn’t get much info from previous owners.

[TVLynn]

You would need to know what heads it has are they stock pistons has it been re bored What is the cranking compression reading. That a side for a 383 most likely a 9.5 to one

[RacerHog]

I would say 8.5.1 C.R.