retro fit 351w
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Joined: Feb 2001
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retro fit 351w
I just completed the job on monday
Edelbrock performer series cam, carb (1406) and manifold as well as MSD Blaster ignition with super stock coil, and a distributor out of a 85 bronco (vacuum advance)
sounds great! excellent rpm range (up to 3800 not broke in enough to really push it but there I've already gained 800 rpm over what I had) but there is one small pain in the rear that is showing its face... the second I put any load on the engine it dogs out (just normal driving) unless I'm on the gas (about 1/2 petal) it acts like it is missing. have played with timing helps but not the cure.. have timing set @ 10 deg btc with vacuum line off and plugged. a little confused as to which port on the carb to hook it up to as well one is listed as a "ported vacuum port" the other is listed as a "full time vacuum port" which is the correct one? and the most frustrating part is it runs better without and vacuum advance and I know that this is not the answer.
do I need to time the engine differently? change the gap on the plugs (what gap would you recommend)? or what? thanks for all of the input you gave before I started this; with that added knowledge I didn't run into one problem thanks again!!!!!
Edelbrock performer series cam, carb (1406) and manifold as well as MSD Blaster ignition with super stock coil, and a distributor out of a 85 bronco (vacuum advance)
sounds great! excellent rpm range (up to 3800 not broke in enough to really push it but there I've already gained 800 rpm over what I had) but there is one small pain in the rear that is showing its face... the second I put any load on the engine it dogs out (just normal driving) unless I'm on the gas (about 1/2 petal) it acts like it is missing. have played with timing helps but not the cure.. have timing set @ 10 deg btc with vacuum line off and plugged. a little confused as to which port on the carb to hook it up to as well one is listed as a "ported vacuum port" the other is listed as a "full time vacuum port" which is the correct one? and the most frustrating part is it runs better without and vacuum advance and I know that this is not the answer.
do I need to time the engine differently? change the gap on the plugs (what gap would you recommend)? or what? thanks for all of the input you gave before I started this; with that added knowledge I didn't run into one problem thanks again!!!!!
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Joined: Mar 2000
Posts: 425
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retro fit 351w
That sounds to me like you need more fuel to the motor...I have NO idea what to do to carbs, but I'd try a high pressure fuel pump or a adjustable fuel regulator...oh d#mn thats right carb, yah try richening the low end? My only experience with carbs is R/C cars, and they have idle mixture, low end, and top end adjustments
1995 F-150XL SC/SB
http://members.sounddomain.com/blind
5-Star Rated F-150 (Big Stereo)
1995 F-150XL SC/SB
http://members.sounddomain.com/blind
5-Star Rated F-150 (Big Stereo)
Posting Guru
Joined: Jun 1999
Posts: 1,100
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From: Durham
retro fit 351w
The distributor should run the vacuum advance off the ported vacuum port. At idle (below about 900 rpm) the ported vacuum shots off and there is no vacuum to the distributor. It only turns on when you take it up off idle. It sounds like your stumble is fuel related. Like maybe an accelerator pump or maybe you are jetted to lean. Try taking it up a step or two on the jets.
'82 F150 2WD w/351W (orig 300 I6)
Slik
'82 F150 2WD w/351W (orig 300 I6)
Slik
