Why 2" exhaust manifolds
Burning Brakes
Joined: Aug 2013
Posts: 1,071
Likes: 322
From: palm springs ca
Race Director
Joined: May 2006
Posts: 18,742
Likes: 2,583
The 2 1/2" ended in 65 from what I can tell. So the 327 and 350 from 66 through 70 with both the 350 HP and 370 HP used the smaller 2" so HP doesnt appear to be the determining factor of it's discontinuation.
Safety Car
Joined: May 2008
Posts: 3,754
Likes: 721
From: Lafayette Louisiana
Will the 2 1/2" fit on the 66 thru 70 heads?
Hope not hijacking here, but will the 2 1/2" fit on the 327 350 66 thru 70 heads? So maybe you could swap out to the earlier larger manifold assuming you could find and afford them? This would seem to be directionally better???
Race Director
Joined: Apr 2003
Posts: 19,352
Likes: 654
From: Tampa, Florida
Yes they fit and reproductions are easily found.
Safety Car
Joined: Oct 2007
Posts: 3,729
Likes: 267
From: Austin Texas
Corvette of the Year Winner 2017
2016 C3 of Year Finalist
Interesting, 2.5" small block C2 exhaust manifolds,
do they dump/exit in same position as C3 manifolds ?
therefore you could use BB=2.5" C3 pipes on SB with C2 manifolds.
do they dump/exit in same position as C3 manifolds ?
therefore you could use BB=2.5" C3 pipes on SB with C2 manifolds.
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
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
Some of the vendors (Allen's is one) will bend up a set of 2 1/2" pipes on request to fit a C3 if you want to use 2 1/2" manifolds.
Also some of the C3's came with 2 1/2" pipes from just below the (2") manifold to the mufflers. You can just replace the short 2" section of pipe with a 2 1/2" section to have a complete 2 1/2" system with the correct manifolds.
Good luck... GUSTO