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Is it possible to machine HP manifold gasket surface?
#825582
10/09/10 03:07 PM
10/09/10 03:07 PM
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Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
NAS Backyard
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
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I've had a litttle tic tic tic leak forever on my RR . I replaced the exhaust flanges, half the exhaust and numerous gaskets with no luck. I was thinking they might be leaking at the manifold gasket surface. It has the stock waffled tin gaskets. I also need to reseal the manifold stud treads since they leak a little. Whats a good sealer to use on the studs. My plan was to remove the manifolds, sandblast, Por 15 manifold grey paint, have them resurfaced, new Mr Gasket hi temp gaskets and reseal the stud threads. Am I missing anything.? Thanks
1970 Challenger Ragtop 426 4 speed
1961 Olds 88 2 dr Sedan 394 4 speed GVOD
1968 Pontiac Firebird 428 4 speed
2000 Ford F-150
2002 HD Roadking
1961 Licence Plate collection
1995 Buick Roadmaster
www.nogreenautolaws.com
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Re: Is it possible to machine HP manifold gasket surface?
[Re: NAS Backyard]
#825587
10/09/10 04:24 PM
10/09/10 04:24 PM
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Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
Rick_Ehrenberg
top fuel
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top fuel
Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
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Sure, they warp all the time, any machine shop can clean 'em up (mill or surface grind).
OEM there were no gaskets and none were needed. Warped, though, thick gaskets are helpful, but if they blow out, you have an even bigger leak.
Rick
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Re: Is it possible to machine HP manifold gasket surface?
[Re: Twostick]
#825592
10/10/10 02:43 AM
10/10/10 02:43 AM
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Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
NAS Backyard
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
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I have a great machine shop. Looks like I had a small leak. I can't believe I drove this this 12K miles like this! FYI machine your manifolds during rebuild!
1970 Challenger Ragtop 426 4 speed
1961 Olds 88 2 dr Sedan 394 4 speed GVOD
1968 Pontiac Firebird 428 4 speed
2000 Ford F-150
2002 HD Roadking
1961 Licence Plate collection
1995 Buick Roadmaster
www.nogreenautolaws.com
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Re: Is it possible to machine HP manifold gasket surface?
[Re: NAS Backyard]
#825593
10/10/10 02:52 AM
10/10/10 02:52 AM
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Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
NAS Backyard
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
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The centers are in by 1/32-1/16th! Sand blast, magnaflux, machine, POR 15 manifold gray. Lots of leaks on the studs. That was caused by using never seize instead of thread sealer, Duh! My Bad! Anybody know where I can get a reasonably priced heat flapper thingamajigg (heat riser?) May as well fix that too.
1970 Challenger Ragtop 426 4 speed
1961 Olds 88 2 dr Sedan 394 4 speed GVOD
1968 Pontiac Firebird 428 4 speed
2000 Ford F-150
2002 HD Roadking
1961 Licence Plate collection
1995 Buick Roadmaster
www.nogreenautolaws.com
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Re: Is it possible to machine HP manifold gasket surface?
[Re: NAS Backyard]
#825594
10/10/10 10:20 AM
10/10/10 10:20 AM
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Joined: Jan 2003
Posts: 75,043
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,043
U.S.S.A.
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Quote:
Anybody know where I can get a reasonably priced heat flapper thingamajigg (heat riser?) May as well fix that too.
What type of choke set up are you using on your carb ?
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Re: Is it possible to machine HP manifold gasket surface?
[Re: stubbs300 ]
#825595
10/10/10 12:17 PM
10/10/10 12:17 PM
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Joined: Jan 2003
Posts: 2,530
Nunya CA
CR8CRSHR
master
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master
Joined: Jan 2003
Posts: 2,530
Nunya CA
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Quote:
Cr8crshr bought a used set for his Satellite project and had them surfaced to CYA and when he went to torque them it broke one of the eyelets. He used Remflex gaskets. Soooooooo he got the repops from Yr. 1 and comparing the 2 surfaces, he found the old ones where alot thinner, so maybe the old ones had been surfaced a time or two.  Just something to think about that they might not be able to handle it. Good luck though with whatever you decide.
Yep they broke due to stress cracks from years of use. Hot then Cold will do that to cast materials. Even if they appear to be in good shape, the interior metallurgy can have flaws that will be brought out after lengthy use. Any way...with the new Y1 manifolds and using the Remflex Gaskets, I feel I have a good seal. EBoogher is right that from the factory they didn't use any gaskets. I did this time just because and after my initial break in run on the new motor I will re-torque the manifold bolts. NAS Backyard...today I will be out in my shop organizing stuff and I have a complete Heat Riser Kit..if I can find it , you can have it. I will PM with details later....cr8crshr/Bill 
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Re: Is it possible to machine HP manifold gasket surface?
[Re: CR8CRSHR]
#825596
10/10/10 02:30 PM
10/10/10 02:30 PM
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Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
NAS Backyard
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
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Manual choke. Thanks Bill! I'm running an 800cfm Edelbrock but will be trying a little "experiment" with a cough!spit! choke! gm qjet.
1970 Challenger Ragtop 426 4 speed
1961 Olds 88 2 dr Sedan 394 4 speed GVOD
1968 Pontiac Firebird 428 4 speed
2000 Ford F-150
2002 HD Roadking
1961 Licence Plate collection
1995 Buick Roadmaster
www.nogreenautolaws.com
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Re: Is it possible to machine HP manifold gasket surface?
[Re: NAS Backyard]
#825598
10/10/10 06:04 PM
10/10/10 06:04 PM
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Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
NAS Backyard
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
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POR 15 Manifold Gray, ready for machine shop, I'll put another coat on when there done.
1970 Challenger Ragtop 426 4 speed
1961 Olds 88 2 dr Sedan 394 4 speed GVOD
1968 Pontiac Firebird 428 4 speed
2000 Ford F-150
2002 HD Roadking
1961 Licence Plate collection
1995 Buick Roadmaster
www.nogreenautolaws.com
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Re: Is it possible to machine HP manifold gasket surface?
[Re: NAS Backyard]
#825599
10/10/10 06:11 PM
10/10/10 06:11 PM
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Joined: Jan 2003
Posts: 75,043
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,043
U.S.S.A.
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Quote:
Manual choke. Thanks Bill! I'm running an 800cfm Edelbrock but will be trying a little "experiment" with a cough!spit! choke! gm qjet.
With a manual choke you don't need the flapper , I'd just remove it completely and block the holes .
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Re: Is it possible to machine HP manifold gasket surface?
[Re: JohnRR]
#825600
10/11/10 11:08 AM
10/11/10 11:08 AM
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Joined: Jan 2003
Posts: 2,530
Nunya CA
CR8CRSHR
master
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master
Joined: Jan 2003
Posts: 2,530
Nunya CA
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Quote:
Quote:
Manual choke. Thanks Bill! I'm running an 800cfm Edelbrock but will be trying a little "experiment" with a cough!spit! choke! gm qjet.
With a manual choke you don't need the flapper , I'd just remove it completely and block the holes .
That is correct also. If you are still interested though I do have one. Still looking for it as I spend today in the shop....
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