No hole in Gaskets?
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Elder User
Joined: Jul 2002
Posts: 523
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From: Illinois
No hole in Gaskets?
Just a quick Question??
So I'm ready to put my new Edelbrock Performer RPM on my new motor and there are no holes in the intake gaskets for the exhaust crossover. ('71 351w 16 Bolt heads and gaskets). Should I cut them out so Exhaust can flow through the manifold or just leave the ports sealed up??
Thanks!!
So I'm ready to put my new Edelbrock Performer RPM on my new motor and there are no holes in the intake gaskets for the exhaust crossover. ('71 351w 16 Bolt heads and gaskets). Should I cut them out so Exhaust can flow through the manifold or just leave the ports sealed up??
Thanks!!
Senior User
Joined: Jun 2003
Posts: 439
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From: Burnsville, MN
No hole in Gaskets?
Better to keep them closed, unless you are concerned about:
1). Cold weather operation.
2). Meeting emissions.
The purpose is to heat the air/fuel charge prior to it going into the cylinder.
By heating it, the charge will be less dense, which equates to less fuel to burn and less horsepower.
1). Cold weather operation.
2). Meeting emissions.
The purpose is to heat the air/fuel charge prior to it going into the cylinder.
By heating it, the charge will be less dense, which equates to less fuel to burn and less horsepower.
Senior User
Joined: Jun 2003
Posts: 439
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From: Burnsville, MN
No hole in Gaskets?
It depends,
If you are looking for power and willing to risk cold weather driveability issues then no. If you are looking for reliability and willing to take a performance hit then yes. But don't cut the gaskets yourself, the port that will need to be opened will need a steel lining so the exhaust gases won't burn the gasket material.
If you want it open, just get a different gasket set.
If you are looking for power and willing to risk cold weather driveability issues then no. If you are looking for reliability and willing to take a performance hit then yes. But don't cut the gaskets yourself, the port that will need to be opened will need a steel lining so the exhaust gases won't burn the gasket material.
If you want it open, just get a different gasket set.
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Elder User
Joined: Jul 2002
Posts: 523
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From: Illinois
No hole in Gaskets?
The plain RPM does. The RPM air gap does not. Why wouldn't the gasket burn without the hole verses burning if I made the hole? If I made the hole the same size as the ports why would anything burn?
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Senior User
Joined: Jun 2003
Posts: 439
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From: Burnsville, MN
No hole in Gaskets?
I don't know for sure but here goes:
In my experience any gasket that handles exhaust gases moving past it has metal installed. If you have the hole plugged then no exhaust can move past the gasket surface and damage it.
Does somebody else have a better explaination?
In my experience any gasket that handles exhaust gases moving past it has metal installed. If you have the hole plugged then no exhaust can move past the gasket surface and damage it.
Does somebody else have a better explaination?
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Senior User
Joined: Jun 2003
Posts: 439
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From: Burnsville, MN
No hole in Gaskets?
Evan,
I seem to remember my FE intake gaskets (62 ford) had a metal ring impressed into the gasket material only around the exhaust crossover port.
Since this was back in the 70's, I could be having another mental lapse. I never installed an intake on a 302/351 engine so I cannot say what the application details are on that motor.
I would suspect that if you buy (vs. customize) the gasket set with the exhaust port opening, it will be properly constructed - metal or not.
Best of luck to you,
Bill
I seem to remember my FE intake gaskets (62 ford) had a metal ring impressed into the gasket material only around the exhaust crossover port.
Since this was back in the 70's, I could be having another mental lapse. I never installed an intake on a 302/351 engine so I cannot say what the application details are on that motor.
I would suspect that if you buy (vs. customize) the gasket set with the exhaust port opening, it will be properly constructed - metal or not.
Best of luck to you,
Bill
Senior User
Joined: Mar 2003
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No hole in Gaskets?
Port fuel injected motors don't have this problem but on a carb engine whether airplane or auto ice can build up inside the manifold choking the engine even on a 75-80F day. Carb Icing is the term. Serious problem on an airplane! That is why planes have carb heat and autos have manifold crossover. Block the passage and your engine, under the right atmospheric conditions, will choke itself and die untill it sits long enough for the engine heat to melt it. Then you crank up the engine and drive untill it freezes up again a few minutes later repeating the process until the weather changes or you open the hole in the gasket.
Postmaster
Joined: Jan 2003
Posts: 4,417
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From: Durham, NC
No hole in Gaskets?
Originally posted by GR
iesel
Evan,
I seem to remember my FE intake gaskets (62 ford) had a metal ring impressed into the gasket material only around the exhaust crossover port.
Since this was back in the 70's, I could be having another mental lapse. I never installed an intake on a 302/351 engine so I cannot say what the application details are on that motor.
I would suspect that if you buy (vs. customize) the gasket set with the exhaust port opening, it will be properly constructed - metal or not.
Best of luck to you,
Bill
iesel Evan,
I seem to remember my FE intake gaskets (62 ford) had a metal ring impressed into the gasket material only around the exhaust crossover port.
Since this was back in the 70's, I could be having another mental lapse. I never installed an intake on a 302/351 engine so I cannot say what the application details are on that motor.
I would suspect that if you buy (vs. customize) the gasket set with the exhaust port opening, it will be properly constructed - metal or not.
Best of luck to you,
Bill