Fel-Pro .041" Head Gasket Part # ?
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Fel-Pro .041" Head Gasket Part # ?
I'm tryin to figure out what compression will be on this engine...I'm not sure which part # for the fel-pro head gasket of .41". I don't want the Impala .029 gasket. I think compression is going to be too high as it is...
Thanks! (I need to find out the gasket bore).
Thanks! (I need to find out the gasket bore).
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From: Lousiana
You can try this webpage.
http://www.gafba.com/calculators/cmpratio.asp?mode=ntr
To get the stock compression of an LT1 I had to use 7.5 for the piston dish volume. That is if the stock compression is 10.4:1 which I think it is. Don't forget to change the head gasket bore size also for the felpro
Jeff D.
http://www.gafba.com/calculators/cmpratio.asp?mode=ntr
To get the stock compression of an LT1 I had to use 7.5 for the piston dish volume. That is if the stock compression is 10.4:1 which I think it is. Don't forget to change the head gasket bore size also for the felpro
Jeff D.
Last edited by PoorMan; Jun 10, 2003 at 09:29 PM.
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Thanks I'll give that page a looking over too. This is the one I'm looking at right now. I'm not sure on some things...
http://www.smokemup.com/auto_math/compression_ratio.php
Bore: 4.03
Stroke: 3.75
Conn Rod Length: 6
Cyl Head VOl: 54
Deck Height: ?
Head Gasket Bore: ?
Head Gasket Thickness: .041
Piston-Wall Clearance: ?
TOp Ring Land Height: ?
Dish Volume: 5 (valve reliefs)
I'm assuming stock, the deck height will be .025 ? From what I'm told the pistons come .025 in the hole. I'm trying to see what my compression will be at if I deck it to 0, or .005 out of the hole with a .041" gasket to maximize quench. One other problem is the heads will also be milled to clean them up, not sure how much that will effect.
I'm trying to keep the CR to around 10.5:1 so I can run 93 octane
http://www.smokemup.com/auto_math/compression_ratio.php
Bore: 4.03
Stroke: 3.75
Conn Rod Length: 6
Cyl Head VOl: 54
Deck Height: ?
Head Gasket Bore: ?
Head Gasket Thickness: .041
Piston-Wall Clearance: ?
TOp Ring Land Height: ?
Dish Volume: 5 (valve reliefs)
I'm assuming stock, the deck height will be .025 ? From what I'm told the pistons come .025 in the hole. I'm trying to see what my compression will be at if I deck it to 0, or .005 out of the hole with a .041" gasket to maximize quench. One other problem is the heads will also be milled to clean them up, not sure how much that will effect.
I'm trying to keep the CR to around 10.5:1 so I can run 93 octane
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with .010 milling you'll see exactly .22 compression change, so if you were at 10.4:1 stock it'll be 10.62:1, and with felpro 1074 you'll have 10.9:1 about.
Jeff D.
Last edited by PoorMan; Jun 10, 2003 at 09:55 PM.
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with .010 milling you'll see exactly .22 compression change, so if you were at 10.4:1 stock it'll be 10.62:1, and with felpro 1074 you'll have 10.9:1 about.
Also, my heads were glass beaded? to clean them up. How much can I expect them to mill in order to get them flat again?
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I think most "cleanup" cuts are about 0.004-0.006 mills. The cut decreases chamber volume so that's were the change in the calc needs to be made. -2 or -3 cc's there if I remember correctly. With any valve work the only way to really know is to cc the chambers though. The calc page will work for any head, but the default values are set for stock LT1 so it fills in alot of holes that we don't change and makes it easier.
Jeff D.
Jeff D.
Last edited by PoorMan; Jun 11, 2003 at 10:45 AM.
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.04-.06 
So that means that I'm going to raise compression by .88 to 1.32
Or did you mean .004-.006 ?
with .010 milling you'll see exactly .22 compression change, so if you were at 10.4:1 stock it'll be 10.62:1, and with felpro 1074 you'll have 10.9:1 about.
Or did you mean .004-.006 ?
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Fel Pro 1074 says:
Must be a typo? AFAIK the LT1 was 93-97 correct? There should be no reason this won't work on my engine....
I guess I was wrong, .041" is a Ford Gasket. Muh bad! $35 ea. @ Summit.
Is a Fel-Pro 1074 Gasket my best bet?
Is there a GASKET SET that will include these? I do need a whole set...Builder said that the gasket set he's getting comes w/ head gaskets, but I'd be better off getting a better head gasket...
http://store.summitracing.com/partde...TFS%2D31400907
It actually looks like the Fel-Pro one there is my only option, that it is!
Chevrolet: 1992-96 5.7L (LTI and LT4 engines only), .039 in. compressed thickness, 4.125 in. gasket bore, 8.7cc compressed volume, head gasket
I guess I was wrong, .041" is a Ford Gasket. Muh bad! $35 ea. @ Summit.
This Fel-Pro performance head gasket features a PermaTorque/blue gasket body with a solid steel core to minimize torque loss and gasket blowout, and a wire ring combustion seat with stainless steel "armor" for extra sealing stress around the combustion chambers. Fel-Pro performance head gaskets are made with a pre-flattened steel wire ring, so they have the strength of wire sealing along with minimum brinelling of aluminum heads.
Is there a GASKET SET that will include these? I do need a whole set...Builder said that the gasket set he's getting comes w/ head gaskets, but I'd be better off getting a better head gasket...
http://store.summitracing.com/partde...TFS%2D31400907
It actually looks like the Fel-Pro one there is my only option, that it is!
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That link on the summit page gasket set may not be for LT1's. It says 1987-2000 5.0/5.7. Reverse flow LT1's didn't come out till 1992. The corvette had it first. With just a gasket change stock pushrods are fine. If you mill on top of that shorter ones may be needed. Need to measure to be sure though. Not worth destroying everything.
I never heard of anyone making a stock thickness gasket other than GM.
Never seen a Felpro "set" for the LT1 either. I just buy then all seperate at O'rellys auto parts.
Jeff D.
I never heard of anyone making a stock thickness gasket other than GM.
Never seen a Felpro "set" for the LT1 either. I just buy then all seperate at O'rellys auto parts.
Jeff D.
Last edited by PoorMan; Jun 11, 2003 at 08:14 PM.
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Ahhh OK...
As for pushrods, I'm going to require pushrods anyways, as I'm going with a new cam, valve guides (require hardened pushrods), Basically a whole new valve train incl roller rockers...
Did they make 5.7L engines between 93-97 that were not LT1? I don't know much chevy history, sorry...
As for pushrods, I'm going to require pushrods anyways, as I'm going with a new cam, valve guides (require hardened pushrods), Basically a whole new valve train incl roller rockers...
That link on the summit page gasket set may not be for LT1's. It says 1987-2000 5.0/5.7. Reverse flow LT1's didn't come out till 1992.
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Is this the only head gasket that Fel-Pro makes for LT1? I assume that LT1's require an LT1 specific head gasket?
Anything out there with a compressed thickness of .039-.041", and a bore diameter of 4.080 ish? Maybe that's being a bit ****...but that gasket has a bore diameter of 4.125"....
Anything out there with a compressed thickness of .039-.041", and a bore diameter of 4.080 ish? Maybe that's being a bit ****...but that gasket has a bore diameter of 4.125"....
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