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Old 06-24-2005, 09:37 PM
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Gasket matching worth my time?

Hi dudes,

I'm building a new sbc 383 right now. I'm wondering about gasket matching the intake ports and intake manifold. I know this isn't the most important part of the head for flow restriction, but is it worth doing anyway? I'm using dart IE II 200cc intake runners. The heads just came back from being professionally ported. But I didn't have a lot of cash to spend on porting, so the pro only worked on the bowls and chambers (for about $400 worth). So basically the bowls are real nice but the intake runners are untouched. I'm using a victor jr intake which is also untouched. I think there might be a significant ridge between the intake and heads. I suspect that the intake will have smaller ports than the heads (I'll check for sure tomorrow). I'd like to enlarge the intake ports to match the head ports, but I don't want to create a scenerio where the intake is larger and "steps up" into the smaller head. So I figure if I match them both to the gasket it should take care of any large steps. Maybe I should leave the intake slightly smaller to ensure if there is a step, at least it'll be a step down?
The other option is to leave it and put it together as is.
Any thoughts? thanks,
dh

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Old 06-24-2005, 09:46 PM
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do the gasket matching.it is hard,doesn't take long and makes your porting worth while.why port if you're going to skip the gasket matching.it is just an extention of your porting.don't be satisfied with half a job.
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Old 06-24-2005, 10:14 PM
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If there's a bad misalignment between the intake and head I would advise correcting that and nothing more. Port matching is the kind of thing you tackle after all other avenues of increasing horsepower have been exhausted, and you really really want that last two horsepower.

Larry
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Old 06-25-2005, 07:35 AM
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i say yes. do the gasket match.
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Old 06-25-2005, 10:09 AM
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gasket match

I doubt you will have to do too much with the Victor Jr anyway. It has very large runners.

I bought a set of Edelbrock Perf/RPM heads and an RPM/Airgap intake. The gasket lined up with the heads perfectly but were not even close to the Airgap runners. I can't understand why Edelbrock cannot get their intakes to line up with their heads. There wasn't near enough material to gasket match the intake.
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Old 06-25-2005, 10:32 AM
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I don't see how you could not match the intake to the port of the RPM heads. I have ported the RPM intake to match into 210cc runners with no problems. Unless they changed things in recent years. Besides if the intake is smaller than the heads it's not a big deal and likely is not hurting a thing.
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Old 06-26-2005, 12:46 PM
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Thanks for the replies. Yesterday I went ahead and gasket matched the intake and heads. It all went pretty easy and only took a few hours. Three cheers for carbide cutters! Not the most exciting thing to do, but I'm glad I did it.
The intake manifold (victor jr) has pretty big runners except for the last half inch before the gasket flange. It seems to taper in right at the flange. I had about 1/8" (sometimes more) material to cut at every side of the manifold ports.
The heads were a lot closer to the gasket size. Most ports only needed a slight shave to remove an overlap. Interesting though, on each head there was one port that had over 1/8" overlap on one side of the runner. I think this definately would've portruded enough to cause some sort of flow perturbation.
I'm glad I did it. I'm not sure how much power it'll be worth. Maybe 2 hp? haha. At least I know everything is aligned decently now.
thanks,
dh
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