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Old 05-28-2004, 12:18 AM
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intake gasket block exhaust crossovers?

I was looking at gaskets today, and saw ones from fel pro that had blocked exhaust ports? Is this safe to do? lol What are the purpose of these ports?

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Old 05-28-2004, 12:39 AM
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That's a port built into stock heads that directs exhaust gasses under the plenum of an intake manifold. This heat the floor of the plenum and insures that raw gasoline doesn't pool in there messing up the air fuel ratio t each cylinder. Racing engines block these passages since they want the coldest charge possible for maximum power. It is a bad idea to block them on street cars, assuming it has a stock type manifold with the heat riser passage, since cold manifolds mean poor low speed performance.
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Old 05-28-2004, 01:02 AM
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I have an aluminem intake Edlebrock RPM and a holley street aventer hedman heders, 993 heads a little bit of port cleaning polishing, port matching. with a 270H comp cams. .. stock torwue converter, th350 trans 3200 lb el camino 3.08 rear.

Should I block them or not??

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Old 05-29-2004, 12:00 AM
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Still not sure on what to do? it gets hot in modesto ca but i dunno if this will increse or decrese my performance?
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Old 06-03-2004, 03:21 AM
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hot weather

I just welded up my cross over ports and machined them flt again in a performer 454 aluminum edelbrock manifold .
The reason being , air gap!

Air gap manifolds , for me are the best thing to keep the carb and intake cool.

I have 4x4's and when we get buried in mud the the auto trannies get hot and the hedders ,and the carbs.......every thing gets hot.

Just read an article, on vapor bubbles in the fuel lines and in the carbs, that explained some problems that we were having when we would run the motors hard go racing up over 5000 ft.

air gap manifolds don't have this cross-over , and they never have even given me a hint of vapor bubbles in the fuel or carb.

if you live in the cold weather areas you will have hard cold start problems ,,,,,,,, but if the d--- thing dies and sputters when it gets hot , then seal the cross-over in my opinion.

I will never buy another manifold with a cross-over in a big chevy
And the air gaps only have one problem that might cause a problem to me hear in central america..........
when driven over the high mountain passes (up to 10,000 feet)
they get frosty at the carb, but this never made my engines run worse. Only made mixture cooler and this seemed to help add dense O2 during high altitude richness.

blah blah blah,
OK
there is winter here at all!
In my case they work better than perfectly.
P
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Old 06-03-2004, 07:57 PM
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left out a word

there is NO winter here at all is what i ment to say
and temp. range here is 40 F at 10,000' and up to 95 F at sea level.
I feel better!
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