Which Motor Mounts?
Thread Starter
Advanced
Joined: Jul 2007
Posts: 52
Likes: 0
Which Motor Mounts?
This is it, a 454 goin' inta an '80 L82.
All I can find are part numbers, but not any dimentions. Block hugger headers, for a C3 w/BB, and they hit on the pitman arm bracket where it ataches to the frame. Also hits on the steering box. Can anybody give me some measurements, or where I can get them. I have "heard", that a GM motormount is a GM motormount, but I ain't so sure 'bout that. First time loadin' a 454, done a few SBs.
All I can find are part numbers, but not any dimentions. Block hugger headers, for a C3 w/BB, and they hit on the pitman arm bracket where it ataches to the frame. Also hits on the steering box. Can anybody give me some measurements, or where I can get them. I have "heard", that a GM motormount is a GM motormount, but I ain't so sure 'bout that. First time loadin' a 454, done a few SBs.
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
I don't know if Moroso used the factory dimensions, but their solid mounts for C3's (same for SB and BB) #62530 is 1 3/4" from block surface to CL of the frame mount hole, and 2 5/8" between the frame mount flanges. When changing to them, I experienced no noticeable difference in position.
I've also converted form SB to BB, but used the Hookers instead.
Hope it helps.
If not, at least consider this as a TTT for your thread...
I've also converted form SB to BB, but used the Hookers instead.
Hope it helps.
If not, at least consider this as a TTT for your thread...
Le Mans Master
Joined: Jan 2006
Posts: 6,506
Likes: 139
From: Butler Pa
I switched from a SB to a BB in my '69. Two different part stores listed SB and BB mounts as being different, so I bought the BB mounts which were taller than the SB mounts, but they wouldn't fit my frame horns. I ended up using the SB mounts which fit prefectly.
Le Mans Master
Joined: Jan 2006
Posts: 6,506
Likes: 139
From: Butler Pa
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Burning Brakes
Joined: Feb 2006
Posts: 1,024
Likes: 1
From: AL
some year(s) had shims (1/8") in the shape of a V that went between the block and mount, one or both side(?), for vettes with an A/C option i think. i looked into this when doing a swap, but could never figure out the reasoning. what i ended up with had the dimensions of the SB mount, 99% sure.
the frame horns were the same as far as i could find between the BB and SB on vettes. some chevelles and maybe other cars that had bolted frame horns were different btwn BB and SB i think . . .
the frame horns were the same as far as i could find between the BB and SB on vettes. some chevelles and maybe other cars that had bolted frame horns were different btwn BB and SB i think . . .
Le Mans Master
Joined: May 2003
Posts: 8,877
Likes: 3,556
From: Fernandina Beach FL
2023 Restomod of the Year finalist
2020 C3 of the Year Winner - Modified
