Cracked headers???? See pic!
Le Mans Master
Joined: Dec 2000
Posts: 5,348
Likes: 3,319
They do the same job, but headers are more efficient. Header tubes are equal in length, ensuring the exhaust from each cylinder reach the collector separately, avoiding back pressure. They are also smooth inside. Exhaust manifolds are heavy, brick-like, and the tubes are all the same length, resulting in back pressure. Being cast iron they are rough inside, slowing exhaust flow.
Thread Starter
Racer
Joined: Apr 2017
Posts: 323
Likes: 57
Drifting
Joined: Feb 2005
Posts: 1,457
Likes: 173
From: San Jose Ca
They do the same job, but headers are more efficient. Header tubes are equal in length, ensuring the exhaust from each cylinder reach the collector separately, avoiding back pressure. They are also smooth inside. Exhaust manifolds are heavy, brick-like, and the tubes are all the same length, resulting in back pressure. Being cast iron they are rough inside, slowing exhaust flow.
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
Melting Slicks
Joined: Dec 2017
Posts: 2,012
Likes: 955
From: Central Commiefornia
A stress relief cut is designed to do just that... relieve stress...
If the cut were not made the stress within the continuous flange would increase and potentially warp the flange or the stretch the securing bolt.
If the cut were not made the stress within the continuous flange would increase and potentially warp the flange or the stretch the securing bolt.
Thread Starter
Racer
Joined: Apr 2017
Posts: 323
Likes: 57
what are the chances that these cuts could cause an exhaust leak? At times i hear a slight tick, comes from the drivers side. not real noticeable just real faint. I know there is a gasket in between manifold and the head. But could it be from there? just curious is all..
Racer
Joined: Sep 2012
Posts: 310
Likes: 136
ok, so it is a relief cut.
what are the chances that these cuts could cause an exhaust leak? At times i hear a slight tick, comes from the drivers side. not real noticeable just real faint. I know there is a gasket in between manifold and the head. But could it be from there? just curious is all..
what are the chances that these cuts could cause an exhaust leak? At times i hear a slight tick, comes from the drivers side. not real noticeable just real faint. I know there is a gasket in between manifold and the head. But could it be from there? just curious is all..
Le Mans Master
Joined: Dec 2000
Posts: 5,348
Likes: 3,319
The ticking is indeed the injectors They sound a little bit like a diesel engine.
The fuel pressure is impressively high. The LT4's high pressure fuel pump can hold 2,900 psi at WOT, operating in dense air and at maximum RPM. At idle it is around 350 psi. The maximum is roughly 800 lower with the LT1. Very neat.
The fuel pressure is impressively high. The LT4's high pressure fuel pump can hold 2,900 psi at WOT, operating in dense air and at maximum RPM. At idle it is around 350 psi. The maximum is roughly 800 lower with the LT1. Very neat.
Drifting
Joined: Feb 2005
Posts: 1,457
Likes: 173
From: San Jose Ca
The ticking can also be from expansion. That's what you normally hear sometimes after shutdown as various materials start shrinking as they cool.
Not much chance of the stress relief notches causing an exhaust leak. They're the farthest point away from the edge of the exhaust port. Totally harmless, and beneficial as others above have mentioned
Not much chance of the stress relief notches causing an exhaust leak. They're the farthest point away from the edge of the exhaust port. Totally harmless, and beneficial as others above have mentioned