New Holley HP main body 6 instead of 8 screws
#2611288
01/23/19 10:54 PM
01/23/19 10:54 PM
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Joined: Apr 2006
Posts: 1,005 Central US
grancuda
OP
super stock
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OP
super stock
Joined: Apr 2006
Posts: 1,005
Central US
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Picked up the Holley HP main body “upgrade” for my 67 383. My old, tried & true 850DP has 8 screws from the baseplate to the main body & the new HP has only 6 bolts, 3 on each end & none between the barrels.
I’m getting a whistle now at idle & have sprayed the base to body gasket with brake kleen & it will idle up so it’s pullimg air right where the screws are no longer holding it tight.
Has anyone had any issue with these new mainbodys on old baseplates?
1967 Barracuda Formula S 383 1967 Chevy C10 Short Stepper 1980 Macho Power Wagon LWB 318 2021 Toyota Supra
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Re: New Holley HP main body 6 instead of 8 screws
[Re: grancuda]
#2611294
01/23/19 11:03 PM
01/23/19 11:03 PM
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Joined: Jan 2003
Posts: 14,493 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,493
So. Burlington, Vt.
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They haven’t used the two “inner” screws on the sides on anything in probably over 30 years.
Those two screws are exposed with most single plane manifolds, so they stopped putting them in....... that way they can’t fall out and end up in your motor.
I don’t recall seeing the holes for those screws on any of the newer design main bodies, and the billet base plates don’t have the holes either. Three in front, three in the rear.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: New Holley HP main body 6 instead of 8 screws
[Re: grancuda]
#2611328
01/23/19 11:50 PM
01/23/19 11:50 PM
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Joined: Dec 2007
Posts: 12,587 Great Neck,LI,new york
hemi-itis
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 12,587
Great Neck,LI,new york
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Gotta check the heads,intake manifold , carb{s} and exhaust surfaces for square.
HEMI-ITIS has no cure. My condition is fully BLOWN!!
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Re: New Holley HP main body 6 instead of 8 screws
[Re: hemi-itis]
#2611340
01/24/19 12:16 AM
01/24/19 12:16 AM
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Joined: Oct 2011
Posts: 3,036 bean town ....Ca
WHITEDART
master
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master
Joined: Oct 2011
Posts: 3,036
bean town ....Ca
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Gotta check the heads,intake manifold , carb{s} and exhaust surfaces for square. if I had a blower like that I would need a cigarette to lots of cool shiny stuff would love to have something like that under the hood of a car one day
In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb
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Re: New Holley HP main body 6 instead of 8 screws
[Re: grancuda]
#2611364
01/24/19 01:20 AM
01/24/19 01:20 AM
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Joined: Dec 2005
Posts: 11,540 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,540
Fulton County, PA
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Straightedge the baseplate and the body. Especially the bottom of the body across the screw holes. Not unusual for them to get high spots around the screws. Comes from overtightening. Chuck it in a vice and use a nice fine flat file to knock the high spots down.
If the results don't match the theory, change the theory.
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Re: New Holley HP main body 6 instead of 8 screws
[Re: grancuda]
#2611841
01/24/19 11:10 PM
01/24/19 11:10 PM
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Joined: Nov 2006
Posts: 1,456 oklahoma
forphorty
pro stock
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pro stock
Joined: Nov 2006
Posts: 1,456
oklahoma
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I had an early Proform center that located the metering block a tiny bit lower, resulting in it pressing against the rear vacuum nipple boss. A little filing in the area fixed it.
Last edited by forphorty; 01/24/19 11:10 PM.
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