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carb jetting

Posted By: rampage08

carb jetting - 05/05/09 02:24 AM

just installed a new cam and now dont seem to be gettin enough fuel. the cam is .564 lift and 295 intake 307 exhaust duration. was told should step up jets in carb. i'm runnin a 750 double pump barry grant holly. any suggestions???????????????

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Posted By: rt66jim

Re: carb jetting - 05/05/09 01:55 PM

How many CI's? I wouldn't expect to have to go up more than 4 sizes in the frt and rear. If the carb is right probably not more than 2 sizes. If the cam is alot bigger than the old one. You may need to try a 4 hole spacer under the carb to get a better signal to it. Jim
Posted By: Mr.Yuck

Re: carb jetting - 05/05/09 02:12 PM

need more info, what engine? what was in there before? what is the current jetting..cool truck, where's the bed? loose it on a jump?
Posted By: rampage08

Re: carb jetting - 05/05/09 02:44 PM

is a 360 la. board to 410 c.i. got ported and polished edelbrock heads with 208 and 165 valves. carb is a barry grant holly 750 double pump. front is jeted at 76 and rear is at 83. my old cam was 248 duration and 484 lift and it ran perfect. couldnt find a decent short bed so i made the flat bed out of 3/16 aluminum diamond plat with 2x2 treated wood to keep weight down. bed only weighs 42 pounds
Posted By: Mr.Yuck

Re: carb jetting - 05/05/09 02:49 PM

Try jumping up by 2's and see what happends. That is a lightweight bed.
Posted By: rampage08

Re: carb jetting - 05/05/09 02:53 PM

thank you. just got off phone with summit tech and they said same thing. gonna give it a try.....will post results .......thanks alot

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Posted By: TechAtBG

Re: carb jetting - 05/05/09 04:51 PM

Quote:

just installed a new cam and now dont seem to be gettin enough fuel. the cam is .564 lift and 295 intake 307 exhaust duration. was told should step up jets in carb. i'm runnin a 750 double pump barry grant holly. any suggestions???????????????

As stated jet up the front and the rear 2 numbers at a time and as long as the motor continues to respond you can add jet.
Posted By: rampage08

Re: carb jetting - 05/12/09 01:19 AM

man did that ever work.............. ran a 200 foot long and 3 foot deep pit yesterday in 6.35 seconds.....what a rush

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Posted By: RapidRobert

Re: carb jetting - 05/12/09 01:21 AM

Quote:

man did that ever work

how many sizes up did you go
Posted By: rampage08

Re: carb jetting - 05/12/09 01:22 AM

4 sizes front and rear
Posted By: RapidRobert

Re: carb jetting - 05/12/09 01:38 AM

the only eng change was a different cam & 4 numbers up(per side)got it back perfect
Posted By: Mr.Yuck

Re: carb jetting - 05/12/09 01:51 PM

Quote:

man did that ever work.............. ran a 200 foot long and 3 foot deep pit yesterday in 6.35 seconds.....what a rush



glad it helpped.
Posted By: rampage08

Re: carb jetting - 05/13/09 12:20 AM

not just cam. changed heads and rockers to
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