what is the stock 350 LT1's head gasket compression thickness?
10-23-2008, 07:30 PM
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10-23-2008, 09:39 PM
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10-23-2008, 09:55 PM
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10-24-2008, 12:08 AM
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I know, but .03 CR is .03 CR 
And you're the only always getting on my case about correction info!
I know I'm getting overly picky now, but I'm coming up with 10.74, 11.03 and 11.11 (respectively). heh
For .026 gasket, it's a theoretical FWHP gain of 9hp & 8ft/lbs. Which isn't bad for just a new gasket 8 & 7 for the Impala. Pretty much insures having to run 91oc though. Most everyone does with these cars anyways though (I haven't w/ the gas prices, but it's down to $2.48/gal (91oc) now.)
And you're the only always getting on my case about correction info!For .026 gasket, it's a theoretical FWHP gain of 9hp & 8ft/lbs. Which isn't bad for just a new gasket
8 & 7 for the Impala. Pretty much insures having to run 91oc though. Most everyone does with these cars anyways though (I haven't w/ the gas prices, but it's down to $2.48/gal (91oc) now.)
10-24-2008, 12:28 AM
#11
I'm just reading the results out of my spreadsheet.
Your formula may be taking more into account than my simple little equation.
I'll go round my figures off to the nearest 10th if it will make you happy.
And I'm going to need you to come in this saturday as well, mkay? 
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10-24-2008, 11:42 AM
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Also, any cons to just running the Impala gasket? Like more prone to failing since its thinner? Bumping up the compression ratio seems like a good idea though.
10-24-2008, 09:32 PM
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I really don't know, but I'd think that due to having less surface area, it'd be LESS prone to blowing out. Sort of like having your hand outside the window vertical like a wall, and then flat like a wing. Less surface area for the compression to push against and cause failure. If the metal didn't warp, ideal I'd think would be flush. On cast iron heads, my friend never uses gaskets with stock exhaust manifolds and has never had leak problems. That's quite a different situation though.
10-24-2008, 11:03 PM
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Halucinator, we're gonna need to go ahead and move you downstairs into storage B.
I really don't know, but I'd think that due to having less surface area, it'd be LESS prone to blowing out. Sort of like having your hand outside the window vertical like a wall, and then flat like a wing. Less surface area for the compression to push against and cause failure. If the metal didn't warp, ideal I'd think would be flush. On cast iron heads, my friend never uses gaskets with stock exhaust manifolds and has never had leak problems. That's quite a different situation though.
I really don't know, but I'd think that due to having less surface area, it'd be LESS prone to blowing out. Sort of like having your hand outside the window vertical like a wall, and then flat like a wing. Less surface area for the compression to push against and cause failure. If the metal didn't warp, ideal I'd think would be flush. On cast iron heads, my friend never uses gaskets with stock exhaust manifolds and has never had leak problems. That's quite a different situation though.
07-12-2012, 07:12 PM
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I have a question!! I have a 95 z28 lt1 cam has a 280 duration with a .51 inch lift. The machine shop resurfaced the heads too much that one of the valves hit the piston and bent the push rod to a 45 degree angle. I was told that i could double up on the head gaskets. Is that true? If so wouldnt that change my compression ratio?
07-12-2012, 07:44 PM
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well it i dont think it can b the rocker arms because the 2nd pushrod i put in it, i left it real loose intentionally and the second broke too. so if i go to double copper head gaskets would i have to torque the head bolts to a different torque. or keep the stock 65ft pounds? how would i know how to adjust the timing to the right degree?
07-12-2012, 08:43 PM
#20
Take the engine apart and find out what is wrong.
A LOT of guys around here run heads with bigger valves milled .030 with .026-.029 gaskets and .560-.610 lift on stock shortblocks.
If you are pretzeling pushrods with a .510lift cam and that 280degrees is pretty surely advertized duration then there is an issue that has nothing to do with how much the heads are milled.
You need to start looking for the actual problem.
Even on built zero decked motors few guys have PTV issues with milled heads, thin gaskets and .1 more lift than you have. Now just to be clear lift is not generally the issue with PTV cam timing is but for a cam as small as .510 to hit that would be some really weird specs so it would almost have to be missinstalled with anything vaguely resembling a normal spec.
A LOT of guys around here run heads with bigger valves milled .030 with .026-.029 gaskets and .560-.610 lift on stock shortblocks.
If you are pretzeling pushrods with a .510lift cam and that 280degrees is pretty surely advertized duration then there is an issue that has nothing to do with how much the heads are milled.
You need to start looking for the actual problem.
Even on built zero decked motors few guys have PTV issues with milled heads, thin gaskets and .1 more lift than you have. Now just to be clear lift is not generally the issue with PTV cam timing is but for a cam as small as .510 to hit that would be some really weird specs so it would almost have to be missinstalled with anything vaguely resembling a normal spec.