ah the good bad news.
Which heads?
Thread Starter
Instructor
Joined: Sep 2006
Posts: 165
Likes: 0
From: laguna niguel ca
Which heads?
I have a 12:1 402 with afr 205's that pings when hot out 90+.
Running 18 degrees timing w/ tr6 plugs is the only way to make it stop.
Ive been told it's to small a head for my my comp ratio . I'm thinking about selling or trading my heads for larger ones. What option do i have if i wanted to trade straight up for some used heads better suited for my set up or would porting my 205's work for less?
Thanks guy's
Running 18 degrees timing w/ tr6 plugs is the only way to make it stop.
Ive been told it's to small a head for my my comp ratio . I'm thinking about selling or trading my heads for larger ones. What option do i have if i wanted to trade straight up for some used heads better suited for my set up or would porting my 205's work for less?
Thanks guy's
Last edited by nvygw171; Oct 20, 2008 at 04:39 PM.
Melting Slicks
Joined: Oct 2007
Posts: 2,464
Likes: 2
From: Cedarburg, WI
I have a 12:1 402 with afr 205's that pings when hot out 90+.
Running 18 degrees timing w/ tr6 plugs is the only way to make it stop.
Ive been told it's to small a head for my my comp ratio . I'm thinking about selling or trading my heads for larger ones. What option do i have if i wanted to trade straight up for some used heads better suited for my set up or would porting my 205's work for less?
Thanks guy's
Running 18 degrees timing w/ tr6 plugs is the only way to make it stop.
Ive been told it's to small a head for my my comp ratio . I'm thinking about selling or trading my heads for larger ones. What option do i have if i wanted to trade straight up for some used heads better suited for my set up or would porting my 205's work for less?
Thanks guy's
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
Thread Starter
Instructor
Joined: Sep 2006
Posts: 165
Likes: 0
From: laguna niguel ca
I'm happy w/ the power the 205's put down, i made 435/450 w/ them ( stock ls6 manifold and shorty headers),
do you guys think that 1.85 lifters and a thicker head gasket would get the comp ratio low enough? I switched to a 160 deg thermo tonight and lowered my fan temps, it dropped my idle temp 15 deg to 185 should help some.
it didn't ping at all at willows springs with 100 octane in 106 deg heat. not looking for much more power as i will likely have to upgrade my radiator for track use. just have a slight ping when its hot. wish we had better gas around here.
do you guys think that 1.85 lifters and a thicker head gasket would get the comp ratio low enough? I switched to a 160 deg thermo tonight and lowered my fan temps, it dropped my idle temp 15 deg to 185 should help some.
it didn't ping at all at willows springs with 100 octane in 106 deg heat. not looking for much more power as i will likely have to upgrade my radiator for track use. just have a slight ping when its hot. wish we had better gas around here.
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
I'm happy w/ the power the 205's put down, i made 435/450 w/ them ( stock ls6 manifold and shorty headers),
do you guys think that 1.85 lifters and a thicker head gasket would get the comp ratio low enough? I switched to a 160 deg thermo tonight and lowered my fan temps, it dropped my idle temp 15 deg to 185 should help some.
it didn't ping at all at willows springs with 100 octane in 106 deg heat. not looking for much more power as i will likely have to upgrade my radiator for track use. just have a slight ping when its hot. wish we had better gas around here.
do you guys think that 1.85 lifters and a thicker head gasket would get the comp ratio low enough? I switched to a 160 deg thermo tonight and lowered my fan temps, it dropped my idle temp 15 deg to 185 should help some.
it didn't ping at all at willows springs with 100 octane in 106 deg heat. not looking for much more power as i will likely have to upgrade my radiator for track use. just have a slight ping when its hot. wish we had better gas around here.
As for the lifters, you're talking about rockers. Not a good idea to just throw higher ratio rockers on a car. You risk closing the crucial gap between the valve and piston. It won't lower compression either. You might be able to get a few cc's of material removed from the combustion chambers to lower your compression or like was mentioned before, lower your dynamic compression with a different cam. If you're a weekend warrior, you can add some Torco octane booster. Too expensive to run if it's a daily driver though.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
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