Distributor timing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

81GMCSierra1500 · 11-06-2014, 10:17 PM

Hello again, all,

I just looked at my timing, and I'm running about 9 degrees BTDC, by the chart on the radiator support, it recommends 4 degrees BTDC, but what is the most economical setting for power and efficiency? I understand the theory on adjusting it, but where is the most ideal setting for timing on a 305 4BBL? Keep in mind that as of now, the engine has absolutely ZERO mods, except having the cats and mufflers removed, and glasspacks were put on... I don't have a big ol' beast of a motor :P

Cheers,

'81

11-06-2014, 10:17 PM	#1
81GMCSierra1500 Registered User Join Date: Jan 2014 Location: Courtenay, British Columbia Posts: 107	Distributor timing Hello again, all, I just looked at my timing, and I'm running about 9 degrees BTDC, by the chart on the radiator support, it recommends 4 degrees BTDC, but what is the most economical setting for power and efficiency? I understand the theory on adjusting it, but where is the most ideal setting for timing on a 305 4BBL? Keep in mind that as of now, the engine has absolutely ZERO mods, except having the cats and mufflers removed, and glasspacks were put on... I don't have a big ol' beast of a motor :P Cheers, '81 __________________ 1981 Sierra Classic 1500, 305 4BBL, Ltd. Slip Rear End Last edited by 81GMCSierra1500; 11-06-2014 at 10:23 PM.

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