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Old 11-14-2020, 07:52 PM
Vetteman61 Vetteman61 is offline
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Default Divorced Choke Well Block Off

My 1971 455 has a divorced choke, which sits in a well. If removing the divorced choke is it necessary to use a block off plate for the well?

Thanks,

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Old 11-14-2020, 08:18 PM
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Ben M. Ben M. is offline
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Nope. It's sealed.

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Old 11-14-2020, 08:19 PM
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Tom Vaught Tom Vaught is offline
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If you can't put your finger down inside the cross-over, then you do not need to seal the "pocket" in the cross-over as it is already sealed.

If you CAN put your finger down inside the cross-over, then you need to seal the "HOLE" in the cross-over as it will make noise and leak exhaust fumes into the engine bay.

Tom V.

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Old 11-14-2020, 10:12 PM
Vetteman61 Vetteman61 is offline
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Sounds good. Thanks!

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Old 12-08-2020, 11:08 PM
Vetteman61 Vetteman61 is offline
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In case it helps anyone in the future, if you purchase a new Performer intake, it comes with the block off plate and gasket.

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Old 12-09-2020, 10:06 AM
78w72 78w72 is offline
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Quote:
Originally Posted by Vetteman61 View Post
In case it helps anyone in the future, if you purchase a new Performer intake, it comes with the block off plate and gasket.
the block off plate on performer intakes is for the later year intakes like a 1978 that use the heated choke coil that actually inserts into a open hole on the intake & has 2 bolts, the plate & gasket on the performer block off & seal that hole. on earlier intakes like the 1970, the choke is just a well that is not open & only has 1 bolt & does not need to be sealed.

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Old 12-09-2020, 12:44 PM
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Kenth Kenth is offline
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The block off plate on Perfomer intakes holds a divorced choke unit.
The divorced choke units sold by Edelbrock is for CSB or CBB making them good for Chevy divorced choke style Qjets only.
For use with 1972 and earlier Pontiac Qjets on a Performer intake a 1972 Pontiac Qjet choke unit is required.

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