Re: 750 to 850 carb swap

richter69 June 30th 2013, 12:24 am

no pv's for the win......

f250mike June 30th 2013, 12:36 am

I'm running a 4781 holley.
PV plug on secondaries
83 jets front, 92 rear
1982 F100, 472ci, 1.5 60ft,11.44 @ 118mph 1/4 mile

mike

maverick June 30th 2013, 1:09 am

richter69 wrote:no pv's for the win......

After a good backfire, the pv's will be forever forbidden in his carbs.

BigRigTech June 30th 2013, 7:56 am

f250mike wrote:I'm running a 4781 holley.
PV plug on secondaries
83 jets front, 92 rear
1982 F100, 472ci, 1.5 60ft,11.44 @ 118mph 1/4 mile

mike

That sounds pretty close to what I expect will be the final result on mine after a few runs. My buddy has a crap load of Holley parts in his trailer so we I can borrow some PV plugs to try plugging front and rear. I'm going to get one run in with 750 on for a baseline.

460vega June 30th 2013, 3:47 pm

BigRigTech wrote:How much cam was in that combo?

255/265@.050 .589/.615 108sep. It`s still in it.

BigRigTech July 1st 2013, 11:09 pm

I had the car running this afternoon, with the 750 I get about 7" of vacuum at idle and 6" at idle in gear, just figured I would base line it to aid in setting up the 850.

BigRigTech July 2nd 2013, 10:54 pm

I have the 850 almost ready, I’m going to do a test run to set the floats on it on Thursday night just to have it as ready as possible to save time at the track on Friday. I went with 82/92’s and a 3.5PV in the front, blocked rear PV. I’m curious to see what she does so I’ll make one run with the 750 for a baseline and swap it in.

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