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storm9c1 · 09-25-2014, 11:26 AM

I agree with everyone so far. The distributor is what changed between the two swaps, so I would check that first. This includes timing and firing order of the plug wires! Is the new distributor HEI or points? Geezer may be on to something with the wiring depending on what distributor the truck USED to have and which one is on there NOW. If new one is HEI, try running a temporary power wire straight to the distributor from the battery and see if it runs better.

Did you retain the old carb? You mentioned you changed the gaskets? Sure those are sealing?

How long ago did this engine run properly?

09-25-2014, 11:26 AM	#8
storm9c1 * That's interesting * Join Date: Oct 2008 Location: Pittsburgh, PA Posts: 2,772	Re: motor runs bad please help I agree with everyone so far. The distributor is what changed between the two swaps, so I would check that first. This includes timing and firing order of the plug wires! Is the new distributor HEI or points? Geezer may be on to something with the wiring depending on what distributor the truck USED to have and which one is on there NOW. If new one is HEI, try running a temporary power wire straight to the distributor from the battery and see if it runs better. Did you retain the old carb? You mentioned you changed the gaskets? Sure those are sealing? How long ago did this engine run properly? __________________ Tom Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others...