Question about intake manifold install - Team Camaro Tech
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post #1 of 4 (permalink) Old Jul 12th, 03, 05:38 PM Thread Starter
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Joseph
 
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Ok,

Pulled off my old intake off my 350 to replace it with an Edelbrock Performer RPM. Everything has been going smooth but have one question (for now anyway). I bought the recommended Fel Pro gaskets (PN 1205) and did a test fit to make sure they are correct for my engine. After doing this, I realized that the gaskets are covering a port that lies smack dab in the middle of the head! My question is this, do I carefully carve out a hole in the gasket for the port to allow flow or do I just leave it?

Also, how come my heads have a one port toward the back of the engine (near the distributor) on each head, but the manifold is just solid? My old manifold is the same way.

lastly, how do you torque the middle 4 bolts on the manifold if they are at an angle? I have a 1/2 inch torque wrench and cant get this sucker in there to torque the bolts down. Is this wrench too big?

Any help is appreciated. Thanks,

Joe

[ 07-12-2003, 08:06 PM: Message edited by: racer x ]
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post #2 of 4 (permalink) Old Jul 12th, 03, 09:00 PM
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John
 
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The "ports" in the center of the heads are the Exhaust Gas Crossover. They use the exhaust gasses to heat the base of the carb and help the engine run better during the warm-up period.
Out our way on the left coast in the land of Milk and perpetual sunshine with temps above freezing this system is of little use.
You can just install the restrictor type gaskets you already have or go get a set of 'Block-off' type that have plates over these 'ports'. The less heat that gets to the base of the carb the better for performance. In the 'Ol-Days' we used to pack these passages with tin-foil (aluminum?) or fill them with lead (hey it worked and was cheap), as almost all the 'performance' manifolds had them till the 70's.
The "extra ports" at the 'back' of the heads are just the water crossover ports. If you had dedicated heads for the left and right sides you wouldn't need these extra ports - but Chevy heads (as are most automotive heads) are Symmetrical or designed the same to fit both sides. When used on the other side this port is not needed and the manifold will cover it. BTW - there are manifolds around that have a crossover in the rear, specially later design SBC's.
Lastly - I torque the bolts with a well calibrated hand. Seriously, I don't use a torque wrench on manifolds very often anymore. If I must use a torque wrench here I have a special box end adapter that allows you to get to these bolts. A correction chart for the length difference is included with the tool. I got mine from Snap-On, but I'm sure there are many other places that would carry them much cheaper.

BTW - I used to work for that Mickey Mouse outfit near you - is it still there?

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post #3 of 4 (permalink) Old Jul 12th, 03, 10:14 PM
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Sean
 
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yeah, what vintage said. one thing to add about blocking the crossover. the 1205's are just gasket material over the crossover, and it will blow out in short order. if you do block them, what i did with my old heads is cut a piece of tin about 1/4 larger than the opening, smear a little red rtv on both sides of it, and put it over the opening. then just install the gasket and manifold as per usual. and as for torqueing, i'm pretty "torque happy" with engine fasteners, but i've never torqued a manifold either. i just use a short wrench, so you can't get too much leverage, and tighten all even, with my highly calibrated clicker wrist. that works for me anyway. good luck with it [img]graemlins/thumbsup.gif[/img]

Sean

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post #4 of 4 (permalink) Old Jul 13th, 03, 05:22 AM Thread Starter
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Joseph
 
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Thanks guys for the help. Both of you really cleared everything up for me.

Oh and Vintage 68, that Mickey Mouse outfit you speak of is still around. Just went last month. Expensive, but still fun!
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