Team Chevelle banner

350 Vortec Fouling Plugs

1059 Views 11 Replies 5 Participants Last post by  Aaron
Guys need some help. Recently acquired a sbc 088 Vortec engine with unknown cam. It had been sitting for about a year and the carb was in need of a rebuild but ran decent. Long story short I’ve replaced everything that bolts to the long block. It ran decent for a few miles and then the plugs turned black and sooty. I’ve verified timing with a tdc tool as the balancer mark was off. Now when I blip the throttle it want to sputter back thru the carb and shoot the occasional flame. I verified timing again and then pulled the plugs and noticed how black they are. Need some advice. Specs below.

350 Vortec with 1.54 pistons (so I assume they are .045 in the hole and horrible quench unless previous owner milled the block more.

unknown cam but it’s mild as the Vortec springs appear stock.

Quickfuel 650-q carb (stock and the accelerator pump shoots good as soon as I give it throttle)
Accel HEI distributor
Summit wires
Ran TR55 plugs gapped at .045 but just purchased some 3926 to try a hotter plug.
edelbrock rpm intake
Hv oil pump (60 at idle)
6.5 psi fuel and floats are in the center of sight glass.

718900
See less See more
1 - 4 of 12 Posts
What would be a good easy tunable great outa the box carb under $500? . Aside from ls swapping it I’m hoping a carb swap would do it. Worst case changing the jets.
Just switched to an avs2 and it does much better and no fuel smell. I switched to autolite 3926 plugs. Any issues running these in Vortec heads?
I threw some tr5’s in. Got some bad advise on the plugs and didn’t think to check them. ran fine with them but switched to the proper ones. Thanks for your kind words of wisdom.
1 - 4 of 12 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top