454 engine identification - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tucsonjwt · 02-13-2022, 11:06 PM

I have an 83 C20 camper special with a 454.

It has a GM remanufactured engine (part number 12339193, which is still available from GM for about $3900.)

There is a brass tag on the side of the block identifying it as a GM reman, and a casting mark near it which seems to state "Hi Perf Pass."

Is there a difference between a truck 454 block and a passenger car 454 or are they all "Hi Perf?"

Where would I find the block casting stamp that would show the date of manufacture of the block?

https://www.gmpartsstore.com/oem-par...BoChY0QAvD_BwE

02-13-2022, 11:06 PM	#1
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,188	454 engine identification I have an 83 C20 camper special with a 454. It has a GM remanufactured engine (part number 12339193, which is still available from GM for about $3900.) There is a brass tag on the side of the block identifying it as a GM reman, and a casting mark near it which seems to state "Hi Perf Pass." Is there a difference between a truck 454 block and a passenger car 454 or are they all "Hi Perf?" Where would I find the block casting stamp that would show the date of manufacture of the block? https://www.gmpartsstore.com/oem-par...BoChY0QAvD_BwE Attached Images



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