OK. I've got my '87 Vette engine in my '88 IROC. Now I need a PROM for it, but I'm unsure which factory PROM to use. The car originally came with the 5.7 and 3.27 gears (PROM AKXX), when I got it, the owner swapped a 2.77 into it (which paired with ABYA).

So, to get to the meat of it: Is there a difference in engine parameters between AKXX and ABYA? I mean, I'm sure there's transmission variables, but is anything fuel related different? How?

And finally, will running a F-body PROM reduce the power of the '87 Vette engine? How much "hotter" was the Vette ECU?

Thanks,

-P
'88Z 5.7

 

Not sure which year Vette started with the aluminum heads. If the engine you have is iron headed then just use the f-body MEMCAL that matches your cars drivetrain.

If the engine is aluminum headed then the timing tables will be very much different. But a Vette MEMCAL won't run properly in an f-body.

RBob.

 

It does have the aluminum heads. How much of a difference would it make?

-P

 

Enough that you'd want to make some changes.

RBob.

 

Ok. Would it have enough of an impact that the engine would get damaged? Would emissions quality suffer?

-P