Thread: SBC 350 Timing at high altitude

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Hey Guys,

Any know how far advanced my timing should be in Colorado? I brought my truck out from Michigan and have been having lots of trouble getting it to run right. I think I'm at 6-7 degrees advanced right now and I still keep getting backfires here and there..no alot..but just enough...and my gas milage is aweful. My set up is a 350 SBC bored 30 over with a 600 Edelbrock Preformer carb, 1/2 spacer. Other than that rest is stock. If anyone could shed some light would be greatly apperciated. Altitude where I live is about 5800 i think.

Thanks, Mitch J

Originally posted by maddmitch
Hey Guys,

Any know how far advanced my timing should be in Colorado? I brought my truck out from Michigan and have been having lots of trouble getting it to run right. I think I'm at 6-7 degrees advanced right now and I still keep getting backfires here and there..no alot..but just enough...and my gas milage is aweful. My set up is a 350 SBC bored 30 over with a 600 Edelbrock Preformer carb, 1/2 spacer. Other than that rest is stock. If anyone could shed some light would be greatly apperciated. Altitude where I live is about 5800 i think.

Thanks, Mitch J

looks like no body else is gonna awswer this mitch so ill start so somebody will come out and tell me im crazy as hell, but far as i know the Altitude wouldnt have anything to do with the timing. it will lean out or richen the carb. you say the timing is at 6-7 degrees advanced now , is that your base timing or you total adv. timing. sounds like if every thing is the same like you fuel have leaned out, might need to rejet the carb. JMO

sounds like maybe I'll need to try that carb. shop in Littleton. Thanks for the info guys

Originally posted by DennyW
Colorado, you have to give it more Air. Most local shope there can do this. They enlarge the air, or add an additional air adjustment. Timing will remain the same.

whats the dif. in more air or less gas.

You will need to lean out the jets, less fuel. The only way to increase air supply is put a huffer on it and cram it in.

Denny, on typical carburetor, where are the air jets? I am familiar with the fuel jets, and the metering rods and jets on some carbs, but where are the air jets? Except for in the idle circuit I thought the air was metered by the butterflies

thanks

Pat

P.S. Hey Dean how long have you lived in Colorado?

I've only been in Colorado for 30 some odd years. Lowlander befor that.