clifford performance Intake
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Joined: May 2008
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From: In my own world
theyre the headman's from summet. from there ran 2 1/4" duel pipe to a duel in/out flowmaster super 40, and 2 tail pipes straight out the back. I have changed the carb to a 600 cfm, and the truck runs great. I ported the head to the gaskets, and installed a clifford 270 cam. the only thing I wish I wouldn't have done, is the steel timing gears. it is really loud, and people think there is something wrong with it.
Senior User
Joined: Sep 2007
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From: Ct
A larger carb shouldn't run lean.... I have a clifford intake withy a holley 390 on it, with efi manifolds (basically shorty cast iron headers) Its a 6cyl don't spend to much money on it. The holley is a pain to tune, if I did it again I would buy a 2150 2bbl, new 185 bucks and from what I read easy to tune and get the job done.
Elder User
Joined: Jan 2009
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From: Blue Eye, mo. hwy 86 & JJ
here's a question, is it really worth it to do the intake, carb, and header upgrade on a 300? i keep considering it but is the performance difference really worth it? if i did it i would go with the offy 4bbl intake with a 390ish 4bbl, and either the EFI headers or a set of hooker headers i could get for 150....
also found a MSD 'blaster' coil i could land for 40...
also found a MSD 'blaster' coil i could land for 40...
FTE Legend
Joined: May 2008
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From: In my own world
yes it is worth it. not quite set you back in the seat power, but an increadable differance in proformance. gas mileage also improved, from 12 mpg to 18, as long as I keep my foot off the floor. biggest differance is on the big hills, just rolls along and keeps up with no effort. no more holding it to the floor, and watching the speedo dive down
Laughing Gas
Joined: Nov 2006
Posts: 773
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Talked to a friend yesterday that drove his Pro-built 38 Chev. from Indiana to N. Carolina..GMC- 6/5 Speed. He said the first thing he needs to do is replace the Clifford with the Offy..No low end torque. Had to down shift for any incline.. This IS a 5 speed..but he was not satisfied with the performance..
Elder User
Joined: Jan 2009
Posts: 712
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From: Blue Eye, mo. hwy 86 & JJ
yes it is worth it. not quite set you back in the seat power, but an increadable differance in proformance. gas mileage also improved, from 12 mpg to 18, as long as I keep my foot off the floor. biggest differance is on the big hills, just rolls along and keeps up with no effort. no more holding it to the floor, and watching the speedo dive down
MSD coil - $40
offy intake - $300
390 carb - $400
hooker headers - $150
new pipe for duals ~$100
total +- 1000 dollars?
is it worth that much?
Senior User
Joined: Sep 2007
Posts: 121
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From: Ct
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Senior User
Joined: Jul 2009
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when i do this conversion, i dont have vac advance on my dizzy so i need to purchase a dist with vac advance. auto parts store sells one from a 1980 f350 for 60. the module on the fender if i replace that with a msd 6a box and wire it in will that control the spark or will i still need that module. plan on gettin a clifford or offy intake. edlbrock 4 brl carb 600cfm. heddman headers, new dist with vac advance, msd coil and 6a box. Sound good, anything you would change or i need to add???
FTE Legend
Joined: May 2008
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From: In my own world
it's all about what you are looking for, got all my stuff on ebay cheap, except the headers. I guess I have about $400 in it. I'm happy with it, no big block 460, but will definately raise a few eyebrows. best part is better fuel mileage
FTE Legend
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From: In my own world
I also have a big cam, and the head has been ported.I think a stock cam and head would not work with that carb
FTE Legend
Joined: May 2008
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From: In my own world
no more egr. if you want one, I guess you could take the spacer plate off an 80's 5.0 mustang. mabe weld a tube to the headers for it. the intake is long, and away from the block, I don't think the heat is a problem, if anything, just the oposite is true, you nolonger have the heat from the exhaust on the bottom of it