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Author Topic:   Restrictor Plates???
Rollin Thunder
Member
posted June 26, 2003 10:26 PM
I'm not sure but I think I would go with the four barrel settup with four 1 inch holes. If you think about it you have four inches of hole compared to three but thats just my opinion!!


Monster
Member
posted June 27, 2003 07:08 AM
The 2BBL configuration actually has almost 9% more area than the 4BBL plate.The 4BBL would probably have slightly better fuel distribution to the cylinders, but I do not think that will make up for that 9%. A single plane intake will make the carb appear "larger" to the engine, but will have a little softer torque curve under 3500 or so. My choice would be a 2BBL carb(cheaper, too), intake manifold would depend on how high I wanted to spin that fragile Pontiac. If you can stand slightly less low range torque, the single plane will definitely make more BHP.


Earl Parker II
Member
posted June 27, 2003 07:31 AM
Something to consider is which 4 barrel you're allowed to use. In this situation a 390 would perform substantially better than, say, a 750.

Also, what type of spacer will they let you use, open or four-hole (surely it's the latter)? If you can use a four-hole spacer, are you allowed one with holes the same size as the carburetor throttle bores? A 390 used with a correctly sized four-hole spacer might perform pretty well.

Finally, if you're allowed so many inches of spacer, does it all have to be on top of the restrictor plate or can you have two spacers, one above and the other below the plate? Can the holes in the spacers be tapered or do they have to be straight?

Let me know and I'll be happy to provide some suggestions.

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Earl Parker II
www.parkercarburetion.com
704.482.7588


Rollin Thunder
Member
posted June 27, 2003 12:23 PM
Now that changes everything.


rico 08
Member
posted June 27, 2003 09:43 PM
One important thing to do is to run a very tall spacer,it helps alot.


Earl Parker II
Member
posted June 27, 2003 11:39 PM
OK, now the most important question is do you have to run one spacer of any height on top of the plate or can you run two separate spacers with the plate in-between. If it's the latter, particularly if they can be tapered, there is a way to get a big jump on the competition. Let me know.

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Earl Parker II
www.parkercarburetion.com
704.482.7588


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