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  #1  
Old 12-19-2001, 03:10 AM
smolski smolski is offline
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Default edelbrock AFB to Dual Plane Gasket?

I have a new Edelbrock #1407 750cfm on top of an Edelbrock Performer RPM AirGap dual plane intake. I can't adjust the idle mixture at idle RPM. Here are the details:

'70 340
stock (no porting) X heads with stainless valve job
Comp Cams Xtreme Energy 268 cam (installed straight up)
Comp Cams 1.5 Magnum Roller Rockers
Comp Cams lifters and pushrods
Mopar Performance orange electronic ignition setup, stock plugs
Timing at 35 total
1 5/8 headers with turbo mufflers

I'm not shure what the pistons are yet. The engine has obviously been rebuilt recently. The pistons are flat-top with 4 valve cut-outs. Compression tests good.

Haven't checked for vaccum leaks yet. Aside from that, the carb is currently installed with an open plenum gasket. I was wondering, do I have to use a gasket that seals the divider for the two runners? Stupid question, right?
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Old 12-19-2001, 03:25 AM
moparmac moparmac is offline
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What kinda vaccum are you getting?


Moparmac!
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  #3  
Old 12-19-2001, 04:33 PM
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rumblefish360 rumblefish360 is offline
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Default Stupid question? ...Not really, no. It's the 1 you dont ask that is.

Don't worry about the gasket. The gap left under the carb is nothing. Forget it.
If you dont get an adjustment via screws, your running really rich or the passageway is cloged making the screws useless alltogether.
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Old 12-19-2001, 04:53 PM
moparmac moparmac is offline
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I always tune my carbs with a vacuum guage. With out it you are tuning blind. Basically tune for highest obtainable vacuum and you know you will be burning it the most efficiently! Hope this helps. I never tune it to what the book says. Look in an old Motors manual for other suggestions! This is where I learned to tune a carb correctly!
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Old 12-23-2001, 11:30 PM
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1965 Hemi Guy 1965 Hemi Guy is offline
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Do your self a favor use a 4 hole gasket and a vacume guage
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Old 12-24-2001, 01:14 AM
DellG DellG is offline
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If the manifold has just a center divider ( not 4 holes like a factory mainifold ) DO NOT USE A FOUR HOLE GASKET !!!!!!!! If the gasket tears and breaks up, the pieces go through the engine !!!!
Use an open gasket and get a vacuum gauge to tune the idle.
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Old 12-24-2001, 02:53 AM
smolski smolski is offline
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I think I remember seeing a divided gasket (two large ovals) included with the carb. Why not use one? It seems like it would match a dual plane manifold (the runners are separated for a reason?). My thought was that an open plenum gasket (one large square cutout) wouldn't divide the carb the way the maniflod wants.

However, I will get a vacuum gauge.
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