Re: 440 .020" Composite Head Gaskets Available?
[Re: hemigod426]
#1167725
01/29/12 03:15 PM
01/29/12 03:15 PM
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Joined: Mar 2010
Posts: 1,880 Out in Left Field, NY
bobs66440
OP
top fuel
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OP
top fuel
Joined: Mar 2010
Posts: 1,880
Out in Left Field, NY
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Quote:
cometic starts @ .027 thickness head gaskets for mopars
I looked on their site and all the ones listed are .040.
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Re: 440 .020" Composite Head Gaskets Available?
[Re: bobs66440]
#1167726
01/29/12 03:19 PM
01/29/12 03:19 PM
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Joined: Mar 2003
Posts: 4,848 Memphis
HemiRick
master
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master
Joined: Mar 2003
Posts: 4,848
Memphis
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Nope the only gaskets that thin are steel shim
Take care, Rick 68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
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Re: 440 .020" Composite Head Gaskets Available?
[Re: bobs66440]
#1167727
01/29/12 03:20 PM
01/29/12 03:20 PM
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Joined: Oct 2007
Posts: 288 Birmingham, England
Mick70RR
enthusiast
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enthusiast
Joined: Oct 2007
Posts: 288
Birmingham, England
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I used steel shim head gaskets with my Stealth heads. I coated them both sides with spray-on Hylomar.
1970 Road Runner
505 cid
MCH CNC ported Stealth heads
MP 528 camshaft
4 speed
GV overdrive
11.98 @ 117 on street treads
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Re: 440 .020" Composite Head Gaskets Available?
[Re: Dodgem]
#1167729
01/29/12 03:39 PM
01/29/12 03:39 PM
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Joined: Aug 2005
Posts: 4,799 ILL
MLR426
master
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master
Joined: Aug 2005
Posts: 4,799
ILL
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Quote:
Not that I've seen. cut .030 off the heads to decrease CC about 5 to 6CC
I agree with above. When it's time to whack'em you must whack'em,
logan426
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Re: 440 .020" Composite Head Gaskets Available?
[Re: bobs66440]
#1167730
01/29/12 08:53 PM
01/29/12 08:53 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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SCR (squeeze) is power, Yes mill the heads & I'd consider more than 9.5. Steel shim ones will work w sealer if both decks are machined flat
live every 24 hour block of time like it's your last day on earth
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Re: 440 .020" Composite Head Gaskets Available?
[Re: RapidRobert]
#1167732
01/29/12 11:17 PM
01/29/12 11:17 PM
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Joined: Mar 2010
Posts: 1,880 Out in Left Field, NY
bobs66440
OP
top fuel
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OP
top fuel
Joined: Mar 2010
Posts: 1,880
Out in Left Field, NY
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Quote:
Quote:
Quote:
cometic starts @ .027 thickness head gaskets for mopars
I looked on their site and all the ones listed are .040.
CGT-C5461-027 is the Summit listing for the .027 compressed thickness gasket, it shows as multi layer steel.
Link to Summit page
Thanks! I'll check it out.
Quote:
SCR (squeeze) is power, Yes mill the heads & I'd consider more than 9.5. Steel shim ones will work w sealer if both decks are machined flat
Is there a formula for cutting the heads a certain amount and knowing how much it reduces volume?
Also, would cutting them .030 effect the valve train geometry and intake manifold fit? I understand that if you cut the heads, you need to also cut the intake to match.
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Re: 440 .020" Composite Head Gaskets Available?
[Re: bobs66440]
#1167733
01/30/12 12:28 AM
01/30/12 12:28 AM
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Joined: Feb 2004
Posts: 964 Nanaimo, B.C.
GwaiiEagle
Mannix
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Mannix
Joined: Feb 2004
Posts: 964
Nanaimo, B.C.
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milling specs. Mister P Body said in another thread: "for every .010 taken of the combustion chamber you need to take .0095 off the intake surface of the head"
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Re: 440 .020" Composite Head Gaskets Available?
[Re: GwaiiEagle]
#1167734
01/30/12 12:32 AM
01/30/12 12:32 AM
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Joined: Jan 2003
Posts: 75,126 A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,126
A Banana Republic near you.
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Quote:
Quote:
Quote:
cometic starts @ .027 thickness head gaskets for mopars
I looked on their site and all the ones listed are .040.
CGT-C5461-027 is the Summit listing for the .027 compressed thickness gasket, it shows as multi layer steel.
Link to Summit page
Quote:
Quantity ..... Sold individually.
$87 a piece , cheaper to cut the heads .
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Re: 440 .020" Composite Head Gaskets Available?
[Re: RapidRobert]
#1167736
01/30/12 12:35 AM
01/30/12 12:35 AM
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Joined: Jan 2003
Posts: 75,126 A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,126
A Banana Republic near you.
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Quote:
Quote:
Is there a formula for cutting the heads a certain amount and knowing how much it reduces volume?
Also, would cutting them .030 effect the valve train geometry and intake manifold fit? I understand that if you cut the heads, you need to also cut the intake to match.
(1) there MAY be some formulas in the archives & try googling that exact how to Q about a particular head. (2) You'd need to machine to get the SCR squared away then set the heads on new gaskets with several bolts per side to JUST snug the heads then mockup the intake to check intake/head port & bolt hole alignment plus lifter preload then you can mill to suit & pushrod length to get preload acceptable. Get each subsystem spot on or near spot on or close enough (depending on what system).
You do need to get out more , cutting the heads to achieve lifter preload ...
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Re: 440 .020" Composite Head Gaskets Available?
[Re: MLR426]
#1167741
01/30/12 11:21 AM
01/30/12 11:21 AM
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Joined: Jan 2003
Posts: 75,126 A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,126
A Banana Republic near you.
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Quote:
Quote:
Ok, thanks guys.
Spending $180 on head gaskets to gain 6-7hp/lbft or going through the trouble and expense of having the heads and intake milled (and all the complicated logistics) for a street car, may not be worth the trouble. Even if I bump it to 9.7:1 it shows I stand to gain only about 15hp/15lbft. I doubt I will feel it while driving on the street. I'll have to bounce it around my brain for a bit.
I appreciate the input.
With a Source head the quoation for surfacing should be checked to make sure it's calculates correct. Everything is getting confused here. To reduce chamber cc volume cut approx .0062 to reduce 1cc. For every .010 thousands cut off the cylinder head deck you would cut .0123 or 12.3 thousands off the intake runner side of the head, your not correcting the intake manifold!!!your correcting the cylinder head face height to lower the intake manifold for better fitment. Also something to check while fitting the manifold, to make sure the manifold is going to seat down good sand or grind off, chamfer at the very bottom edge to knock down the corner of the manifold at the bottom of the intake runner so the manifold will seat properly to the cylinder head intake runner face of the head. I have a Winfield Fixture in my head mill so it's easy for me to do the correction on the intake runner side of the head.
logan426
This is how you do it, quick and easy.
It's going to run how it runs , you are putting too much faith in that computer program for what to me is a mismatched build .
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