PY Online Forums - Bringing the Pontiac Hobby Together

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-   67-79 Big Pontiac TECH (https://forums.maxperformanceinc.com/forums/forumdisplay.php?f=431)
-   -   Need ID help! (https://forums.maxperformanceinc.com/forums/showthread.php?t=397184)

toolman 06-12-2004 10:01 PM
Just bought a 1975 Pontiac Firebird (formula 350) not original engine, it has a 400 (big block?) ID #SR88576 - tried Wallace Racing and no match. Heads are 13, which are from a 1970 300+ HP rated engine. Would like to know what I
'm working with and if it's worth the rebuild.

toolman 06-12-2004 10:01 PM
Just bought a 1975 Pontiac Firebird (formula 350) not original engine, it has a 400 (big block?) ID #SR88576 - tried Wallace Racing and no match. Heads are 13, which are from a 1970 300+ HP rated engine. Would like to know what I
'm working with and if it's worth the rebuild.

Held for Ransom 06-13-2004 07:23 AM
SR blocks are service replacement blocks. Look for the casting number or stamping at the back of the passenger side and post that number.

toolman 06-13-2004 10:29 AM
Went and had a closer look, numbers are there and they read 97999 14. No match at Wallace, and what does service replacement mean? Factory replacement?

johnta1 06-13-2004 01:13 PM
Try the number in the misc. category and leave the space out - 9799914

It'll be a 1970 400 block.

The SR is a replacement block from the factory.


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