I'm doing a intake reseal this weekend,and have always wondered about the "crossover"passage below car,felpro used to give those little tin "plugs" and a chart on which side to put it in.The vehicle in question SB chevy has no choke so warming the choke coil is not a concern-is there an advantage to blocking it [cooler carb base] or just leave them open ??thanks Steve!!!

Steve - it's designed to help the engine warm up quicker in that cold Wisconsin weather, but since you are not running a choke anyway I'll assume that this is a fair weather ride. Go ahead and plug it, you will get a cooler intake charge. I don't know if that's worth any power or not. I pulled my old TorkerII off and those thin plates had burned through but they had been in place for several years.

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79 Z28 Bought new, honeymoon ride, same wife, same car.

If cold starting and warm-up is not an issue, plug them up. If you are still running the stock exhaust manifolds with a heat riser, block the heat riser it the open position. Otherwise,your car will run like a total pig until it warms up, and you will burn through the block off plates in a big hurry.

I always traced the gasket opening on a piece of 24 ga. galv. metal then cut it 1/16 larger and completely blocked them.

When I installed my aluminum RPM intake, I called Edelbrock and asked them about this same thing. The told me to use the Felpro #1205 intake gaskets, which are totally solid in the area of the heat cross over. They said don't worry about the heat cross over being blocked off.

My car is mainly going to be driven in fair weather, so I am not too concerned.

Keizer

<font face="Arial,Verdana" size="2">Originally posted by Keizer:
When I installed my aluminum RPM intake, I called Edelbrock and asked them about this same thing. The told me to use the Felpro #1205 intake gaskets, which are totally solid in the area of the heat cross over. They said don't worry about the heat cross over being blocked off.

My car is mainly going to be driven in fair weather, so I am not too concerned.

Keizer</font>

I thought Eddy's RPM intakes didn't even have a heat crossover? Or does it matter which one you get? They do sell a spreadbore one, that may have the crossover.

<font face="Arial,Verdana" size="2">Originally posted by 1978LT:
I thought Eddy's RPM intakes didn't even have a heat crossover? Or does it matter which one you get? They do sell a spreadbore one, that may have the crossover.</font>

When I was in the parts house buying my intake gasket set for my RPM intake, the parts guy said the same thing. I told him to grab one of his new in the box RPM intakes and check. Sure enough, his had the heat cross over just like mine did.

Keizer

<font face="Arial,Verdana" size="2">Originally posted by Keizer:
When I was in the parts house buying my intake gasket set for my RPM intake, the parts guy said the same thing. I told him to grab one of his new in the box RPM intakes and check. Sure enough, his had the heat cross over just like mine did.

Keizer

</font>

Maybe it's something fairly new?? About 2 years ago I was contemplating between the RPM intake or the Holley 300-36. The Holley had the crossover, and the RPM didn't.