Author Topic: Having trouble tuning this 350 with a bigger cam.  (Read 1139 times)

Offline 1974 GMC 4x4 Truck

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Having trouble tuning this 350 with a bigger cam.
« on: February 22, 2015, 01:11:46 PM »
I have to have carb screws two turns out. And I have to have the timing set off the gauge. Probably at 16 are 18. Can not turn it any more to the right. That's the best I can get it at idle without dying. As fare as I know the 350 is an 87 to 95 year. With a stock 1974 intake and four barrel. Electric fuel pump around 4 pounds. The motor has a bigger cam not sure how big. When it's cold, lot of power. Warms up. Looses power on the start off.  If I go three turns out with carb jets I get a lot more power but smells pretty rich. If I turn down timing it back fires. Spark plugs set around .38 Never had this much trouble tuning before. I might need to re-stab distributed and get a bigger gap on plugs. What do y'all think. Can use some help.
Shawn

Offline Da67goatman

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Re: Having trouble tuning this 350 with a bigger cam.
« Reply #1 on: February 22, 2015, 02:26:09 PM »
I can't help with the carb part of your tuning.  What octane fuel are you using?  also is the dizzy an esc?
<Pitcrew>
1989 R2500 Suburban mild 350 TBI 700r4 10.5" 14bolt 4.10 w/ 33s
1992 fullsize Blazer 4x4  35s no lift, 4.10s, Hella driving lights, TJ Flares, Huge bumpers, Snorkel, custom interior

Offline FlatBlack77

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Re: Having trouble tuning this 350 with a bigger cam.
« Reply #2 on: February 22, 2015, 04:37:10 PM »
what carb do you have? and are you running an HEI distributor? vacuum advance?
"When you are a hammer, everything looks like a nail"
'77 C/10 - 350/350 mild street motor

Online VileZambonie

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Re: Having trouble tuning this 350 with a bigger cam.
« Reply #3 on: February 22, 2015, 08:17:48 PM »
1974 GMC 4x4 truck, why do you keep reporting this post? If you are trying to comment use reply not report.
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Offline 1974 GMC 4x4 Truck

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Re: Having trouble tuning this 350 with a bigger cam.
« Reply #4 on: February 23, 2015, 07:02:36 PM »
Lol. Thanks.   As you can tell I'm new on here.
Shawn

Offline 1974 GMC 4x4 Truck

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Re: Having trouble tuning this 350 with a bigger cam.
« Reply #5 on: February 23, 2015, 07:08:15 PM »
I'm re-stabbing the dist. This weekend. I may just go back with a factory cam. Truck feels like I'm sitten on a Harley.
Shawn