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Old 10-09-2002, 08:00 AM
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Post Gasket Matched Intake

I recently bought a Mickey Thompson Crossram for a 350 chevy. The intake is gasket matched, would this be okay to run on heads that aren't gasket matched. Also does anyone know anything about these intakes and where I could get information on them.
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Old 10-09-2002, 08:16 AM
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It will depend on what you are using the engine for. If it's a street slider with the occasional banzai run don't worry too much. The intake ports in the head will add some restriction for sure but in a street engine will add a little turbulence as well. With the plenum design and runner length and straightness, this should be helpful retaining fuel suspension. Some of these manifolds showed up after a year or so in the sixties with drain stains in the bottom of the runners because things were done too well during the matching and porting sequences and the gas literally fell out of the air stream.

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Old 10-09-2002, 09:42 AM
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Anything doing is worth doing right!!! You must still have the heads on the engine, and want to install the manifoild with out modifying the heads intakes? From what i have seen here on the boards, cross rams are not all that good???? They do look way cool though!! Do you have heads and a cam to utilize the cross ram? Please let us know how it all turns out for you.
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Old 10-09-2002, 09:59 AM
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If the airflow from the intake slams into a ledge onto the head, it's going to have turbulence, and flow will bottleneck right at that point. If the intake is not port-matched and the heads are, it's not much of an issue, as the intake port on the head is larger than the intake, thus no protrusions are sticking out to impede flow.
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Old 10-09-2002, 10:55 AM
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The heads are still on the engine and are stock. I was hoping to leave them on. I didn't buy the intake looking for great performance, I just wanted to fill up the engine bay. The engine is pretty much stock. Thanks for the info.
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Old 10-09-2002, 01:27 PM
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Cross rams can be good or bad, depending on what you use them for. Chrysler put them on late 50's production V-8s with legendary success. Notice that they used very small plenums under the carbs and very long runners. Both features work great for low speed torque but would make the car a poor performer on the top end. Conversely, the one you have is designed for relatively high RPM power range so has short runners and shoe box sized plenum. These features will make less low end power than a stock intake manifold and probably cause low end fuel distribution problems requiring a little larger jetting of the carbs to avoid lean cylinders. Compromise, compromise, compromise! On a hot rod, go for looks every time and run the x-ram.
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Old 10-09-2002, 03:53 PM
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It depends on how much was removed from the intake manifold, Think of it this way, if there is a ledge where the heads intake port matches up to the intake, it will rob horsepower because the fuel will tumble through, and cause flow characteristic problems and thereby cause your engine to run crappy by comparison. Take the time to gasget match the intake port on the head and avoid the headaches.

Keep Hotroddin' <img src="graemlins/evil.gif" border="0" alt="[evil]" />

Oh yeah, I forgot, if this is a mild motor, that intake might give you alot of tuning problems, I don't have any experience with that thing, but I've heard that the mopar boys have problems with the stock maxwedge and hemi crossrams, and that they only like to live above 5000 rpm. so be warned there might not be a problem at all.
grain of salt and all!

[ October 09, 2002: Message edited by: Jay396 ]</p>
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Old 10-09-2002, 05:02 PM
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I think I'll take the time to pull the heads and match the ports while I have the intake off. Thanks for the knowlege.
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Old 10-09-2002, 05:53 PM
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Match them OK. Do not, DO NOT do a real port job.

You've got to keep the fuel in suspension. I ate a speed shop over these damn things.

Well there were one or two other details.

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