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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

intake carb stud thread size

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Old Mar 21, 2014 | 09:42 PM
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intake carb stud thread size

Anybody know the thread size for a carb stud on a 1970 f-100 390 fe engine? Thanks.
 
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Old Mar 23, 2014 | 12:34 AM
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5/16"x18-threads this is for the carb base...
orich
 
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Old Mar 23, 2014 | 04:35 AM
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[QUOTE=orich;14190050]5/16"x18-threads this is for the carb base...
orich[/QUO

Thanks! Now I can get longer ones without taking one out.
 
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Old Mar 23, 2014 | 04:46 AM
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most carb base studs are coarse in the manifold but fine on the nut end. IF you care.
 
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Old Mar 23, 2014 | 08:26 AM
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[QUOTE=EricJ;14190198]most carb base studs are coarse in the manifold but fine on the nut end. IF you care.[/QUOT

Yea that's what I thought so I did not want to get a stud according to the nut off present stud. My carb started to whistle, did some research and sounds like my base plate below the carb may be warped. Figured it would be a good time to replace the too short studs, the nuts barely go on. Thanks for the help.
 
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Old Mar 23, 2014 | 09:18 AM
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[QUOTE=70-360fe;14190459]
Originally Posted by EricJ
most carb base studs are coarse in the manifold but fine on the nut end. IF you care.[/QUOT

Oh Yea that's what I thought so I did not want to get a stud according to the nut off present stud. My carb started to whistle, did some research and sounds like my base plate below the carb may be warped. Figured it would be a good time to replace the too short studs, the nuts barely go on. Thanks for the help.
Yeah, I've had the tall 2" black plastic type one leak due to the way it's made from having the hollow walls.

I was thinking about filling the wall pockets with a epoxy but then said the hell with it. Since, I already a aluminum one!!
orich
 
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Old Mar 23, 2014 | 09:47 AM
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piece of coarse sand paper on a pane of glass makes a nice plane to flush up the warped or dinged riser plates, works on the aluminum and the plastic ones.
 
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Old Mar 23, 2014 | 10:54 AM
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Originally Posted by EricJ
piece of coarse sand paper on a pane of glass makes a nice plane to flush up the warped or dinged riser plates, works on the aluminum and the plastic ones.
Yes but it don't stop the plastic one from warping the gasket in the hollow wall ones.

As this was what was happening in my case. This was why I thought about filling in the wall hollow walls. This if using the tall spacer with the hollow walls that is..:

orich
 
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Old Mar 23, 2014 | 11:36 AM
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This is just the original heat riser, plate of glass is a good idea.
 
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