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Author Topic:   anyone here try proforms 750 cfm main body

Posts: 159
From: folsom,cal,
Registered: Jan 2002

posted 12-08-2002 09:55 AM     Click Here to See the Profile for stoker   Click Here to Email stoker     Edit/Delete Message   Reply w/Quote
have a r4777-2 650 dp holley.just got 331 fired for first time today!!could probably use the extra cfm,especially now that i am running rpm air gap dual plane.comp is 10.4 to 1 afr 185 heads .550 [email protected] solid flat,hooker supercomps.3000 stall 3.25 rear,nitto extreme drags ten inch wide all way around .main objective is to have car that can be reliably driven to car shows,some limited racing both road and drag

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blown 351

Posts: 68
From: Seattle, Wa. 98258
Registered: Dec 2001

posted 12-09-2002 12:59 PM     Click Here to See the Profile for blown 351   Click Here to Email blown 351     Edit/Delete Message   Reply w/Quote
Yes, I've ran it on 4777-2 list metering blocks and base plate. I picked up 33HP and about 25Flbs. The body is not drilled for ported vacuum, so if you want vacuum ignition advance, it's a simple matter of drilling intersecting holes. I was able to run the airbleeds as supplied with 74 primary and 86 secondary fuel jet sizes with a 6.5 P.V and unaltered PVCRs. The old engine responded much better to the downleg booster signal, rather than the straight leg on the 4777-2 body. Another similar blow-through engine config required smaller main circuit airbleeds in order to keep the fuel curve about 12.0:1 through out the pulls made.
At the time it was on a 351W with 6lbs of boost.
Used the proform same body on a 850 baseplate with 4777-2 metering blocks which have slightly enlarged PVCRs and idle jet orifices atop a 393 stroker with 8lbs and it pulls very good off-idle and keeps a strong signal all the way up to 6000 RPM.
I would do it again.

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Rory McNeil

Posts: 1542
From: Surrey, B.C. Canada
Registered: Nov 2000

posted 12-09-2002 01:50 PM     Click Here to See the Profile for Rory McNeil   Click Here to Email Rory McNeil     Edit/Delete Message   Reply w/Quote
I have the Pro Form main body for my 3310-1 Holley 780, hope to try it on the Fairmont next year, as well as my new Edelbrock VICTOR intake (finally got it in Nov. after a mere 8 months on backorder!)

78 Fairmont 428 4 speed [email protected]
80 Fairmont 302 5 speed [email protected]
85 Mustang NHRA Stocker under construction, 302 5 speed
59 Meteor (Canadian Ford) 2 dr sedan 332, auto
74 F350 ramp truck 390 4spd

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