High Performance 454
Thread Starter
Drifting
Joined: Mar 2006
Posts: 1,526
Likes: 2
From: Oak Ridge NC
Originally Posted by longbros
I just purchased a 1970 big block Corvette with the original drive train. While looking the vehicle over and checking all the "numbers", I noticed that down near the oil filter, cast into the block, it says High Perf. Pass. These three words are followed by a large number 4. Does this indicate that this 454 engine has 4 bolt mains? The engine suffix is CZU.
Thanks.
Fred
Thanks.
Fred
Burning Brakes
Joined: Feb 2004
Posts: 924
Likes: 2
From: Kearneysville West Virginia
High Performance 454
I just purchased a 1970 big block Corvette with the original drive train. While looking the vehicle over and checking all the "numbers", I noticed that down near the oil filter, cast into the block, it says High Perf. Pass. These three words are followed by a large number 4. Does this indicate that this 454 engine has 4 bolt mains? The engine suffix is CZU.
Thanks.
Fred
Thanks.
Fred
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
I think the "HI PER PASS" shows up on all the standard deck height big blocks. The 4 bolt main blocks have pipe plugs right above the oil filter pad for an external cooler. Don't take this as gospel, it's been a long long time since I was in there swinging wrenches everyday...
