To deck or not 454?
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
Standard operating procedure is to zero deck an engine based on your rotating assembly. .025 is a nice bump in compression and when cut will be a nice flat sealing surface. Use a Fel-Pro .041 gasket here.
Putting more cam in this engine without increasing compression is shooting yourself in the foot. Compression on its own increases power but it's real benefit is to set the groundwork for other items to enhance power.
The 454HO could use closer to 10 to 1 with a real camshaft.
Jebby
Putting more cam in this engine without increasing compression is shooting yourself in the foot. Compression on its own increases power but it's real benefit is to set the groundwork for other items to enhance power.
The 454HO could use closer to 10 to 1 with a real camshaft.
Jebby
Drifting
Joined: Aug 2004
Posts: 1,883
Likes: 124
From: Lubbock TX
Kidding aside, this guy knows his way around a big block build.
I have EVERY engine I build decked to leave the pistons .005 in the hole. As long as you don't screw up royally, it's a machining procedure that you'll only have to have done once and you'll reap the benefits every time you step on the loud pedal.
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
Jebby
Race Director
Joined: Jan 2000
Posts: 13,018
Likes: 2,262
From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
Listen to this guy, he's the expert on running tight quench. Word is he keeps his tight to keep the rods from stretching LOL.
Kidding aside, this guy knows his way around a big block build.
I have EVERY engine I build decked to leave the pistons .005 in the hole. As long as you don't screw up royally, it's a machining procedure that you'll only have to have done once and you'll reap the benefits every time you step on the loud pedal.
Kidding aside, this guy knows his way around a big block build.
I have EVERY engine I build decked to leave the pistons .005 in the hole. As long as you don't screw up royally, it's a machining procedure that you'll only have to have done once and you'll reap the benefits every time you step on the loud pedal.
There's actually a lot of OEM engines that were built that way. Ford did it in '86 or so on 302's and others and Mopar had some small block ones way up out of there. Right gaskets makes it all come together.
JIM
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
Drifting
Joined: Aug 2004
Posts: 1,883
Likes: 124
From: Lubbock TX
It's only money and as long as it's yours, we're only too happy to help you spend it!
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
Stock 454 Fel Pro Gasket is 4.380....and you cannot notch past it.....so....
Jebby
Last edited by Jebbysan; Jan 24, 2019 at 01:42 PM.
Drifting
Joined: Aug 2004
Posts: 1,883
Likes: 124
From: Lubbock TX
Yep. I'd still bolt a head down and flip it over on the engine stand and see how much of a ledge there is where the combustion chamber overhangs the cylinder bore. It might not be much, but once it's done, the HP is free. It'll have to have at least some affect on turbulence and flow.
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
Yep. I'd still bolt a head down and flip it over on the engine stand and see how much of a ledge there is where the combustion chamber overhangs the cylinder bore. It might not be much, but once it's done, the HP is free. It'll have to have at least some affect on turbulence and flow.
Jebby