View Full Version : Need ID help!
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.