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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 1974 GMC 4x4 Truck on February 22, 2015, 01:11:46 PM

Title: Having trouble tuning this 350 with a bigger cam.
Post by: 1974 GMC 4x4 Truck 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.
Title: Re: Having trouble tuning this 350 with a bigger cam.
Post by: Da67goatman 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?
Title: Re: Having trouble tuning this 350 with a bigger cam.
Post by: FlatBlack77 on February 22, 2015, 04:37:10 PM
what carb do you have? and are you running an HEI distributor? vacuum advance?
Title: Re: Having trouble tuning this 350 with a bigger cam.
Post by: VileZambonie 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.
Title: Re: Having trouble tuning this 350 with a bigger cam.
Post by: 1974 GMC 4x4 Truck on February 23, 2015, 07:02:36 PM
Lol. Thanks.   As you can tell I'm new on here.
Title: Re: Having trouble tuning this 350 with a bigger cam.
Post by: 1974 GMC 4x4 Truck 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.