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Author Topic:   Interchangable parts on a Holley?

Posts: 160
From: California
Registered: Dec 2001

posted 02-07-2003 07:29 PM     Click Here to See the Profile for Skeeter   Click Here to Email Skeeter     Edit/Delete Message   Reply w/Quote
Do you know if parts from a 750 will be the same on a 850? Like the base plate, butter flys and linkage?


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Posts: 1189
From: Connersville, IN
Registered: Jul 2001

posted 02-07-2003 10:37 PM     Click Here to See the Profile for clevelandstyle     Edit/Delete Message   Reply w/Quote
The base plate and butterflies are different between a 750 and a 850 Holley. A 750 has 1 11/16" butterflies and an 850 has 1 3/4 butterflies. That makes the 850 bores about 1/16" bigger.
A common modification is to put the 850 base on the 750, but the 750 bores must be opened and blended to the 850 bores. Because of the greater diffrential, the boosters get a stronger vacuum signal and more responsivness.
Some of the older Holleys have a body mounted linkage. It pivots on the main body. The newer carbs have the lingage all in the base. If you were to swap parts the linkage must match.
A Holley 950HP is basically a 750 with a 850 base, among other mods.
Every thing above the base gasket is pretty much interchangable.

Grabber Green '70 Mach I 351C 4V
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[This message has been edited by clevelandstyle (edited 02-07-2003).]

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