Mojack
Well-Known Member
It doesn't look like it should make a difference, BUT that's how I get into trouble. They are tunneled into the bores anyway or is there a venturi effect that might be necessary?
Open gasket or 4 hole gasket?
- Thread starter Mojack
- Start date
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What does your intake look like?
Mojack
Well-Known Member
A center divider spread bores, unfortunately I'll have to use the Mr Gasket adapter to make it all work.
Open gasket then.
IMO, especially with that setup = It truly
will not make a discernable difference.
I assume you are talking about the gasket
from adaptor to manifold (Although we run an
4 holes on the race cars if we would ever run one
at all) The adapter to carb will entail an open gasket
for our applications even on a street car.
will not make a discernable difference.
I assume you are talking about the gasket
from adaptor to manifold (Although we run an
4 holes on the race cars if we would ever run one
at all) The adapter to carb will entail an open gasket
for our applications even on a street car.
Mojack
Well-Known Member
OK, big dummy alert, I should have looked into it a little closer. Those passages look to just go to the PCV, ported and brake vacuum ports. Nothing complicated just pulling vacuum. Thanks all!
No. Throw that junk in the garbage where it belongs. THIS is all you need.
Edelbrock 2732 Edelbrock Carburetor Adapters | Summit Racing
Free Shipping - Edelbrock Carburetor Adapters with qualifying orders of $109. Shop Carburetor Adapters at Summit Racing.
This type of 4 hole gasket works well with the '68 340 square bore intake and square bore carb.
4 separate holes to seal off.
☆☆☆☆☆
4 separate holes to seal off.
☆☆☆☆☆
He has a spread bore Edelbrock SP2P intake. It's in the picture he posted.
PRH
Well-Known Member
Yup…..that’s the one.
Mojack
Well-Known Member
When using the thin gasket, ALWAYS, ALWAYS convert a 4 hole into an open gasket. Reason is that a backfire could blow out the unsupported section...which will into the engine. There are NO base screws in that carb. It has slots in the carb base that connect both plenums for idle vacuum, so there is absolutely no benefit in using a 4 hole gasket.
Smaller holes tunneled into the bores that are fully baffled most times are nearly chocked by the 4 hole. I would choose the open Gasket to maybe prevent a possible sucking/whistling sound if nothing more.
duster 344
Well-Known Member
In my opinion you should not use an open spacer on a dual plain intake. I put a 1/2 in heat resistant gasket on the duster. They only one they had at the store was open, and it caused a hesitation accelerating at part throttle. Assuming it caused a cross draw under the carb. I put the four hole spacer back on and worked fine again
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