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Old 05-04-2012, 09:40 PM
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350 engine questions

Hi guy's, I need a little help with my 350 in my 30 ford coupe. It's a 76 350 vette motor and I recently was able to fire it up. I used a standard points dist, edelbrock rpm manifold and 600 series carb. I also installed Headers with no pipes yet, any she fires pretty good and runs but she's spitting a little oil around the plugs and is backfireing a little. My brother rebuilt the motor 15 years ago and it sat around till I got it from him. I took it apart and replaced all the rings rod and main bearings, all new gaskets, screw in studs and the umbrella type valve seals. all the valves seemed tight in the guides. I adjusted the valves by running #1 to top dead center and adjusting #8 intake then running #8 up and adjusting #4 etc etc through the order then doing the exhaust the same way. After I got it running I readjusted while it was running to make sure they were all set right. Im running a pcv valve to the front carb vac from the left side and a breather on the right. Im not concerned with the backfire as much as the oil on the plugs. backfire might be timming of a little but can't figure the oil. It only a very small amount but it looks like all the plugs are involved. also the head gaskets are new and un effected. bill

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Old 05-04-2012, 10:02 PM
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if you re-ringed it then it need time to break in.rings need a bit of miles to seat. put about an oil change worth of miles on it and see if it changes. backfire is timing related i bet. tailpipe is retarded, manifold is advance. a fresh 350 should turn 1 or two times and fire right up. if the initial timing is too advanced you should be able to tell the piston is fighting flame.
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Old 05-05-2012, 01:55 AM
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Originally Posted by bill plise
...she's spitting a little oil around the plugs and is backfireing a little.
Do you mean there's oil on the outside of the heads? You might be using the wrong type of plugs, i.e. tapered seat or gasketed. If you're seeing oil on the electrodes, the rings need to break in like was said above, before worrying about that too much. Be sure the PCV valve's working right and not stuck open.

If it's popping through the carb on acceleration it could be retarded timing or the accelerator pump not giving enough (or too late) of a shot. Be sure to double check for vacuum leaks, that can cause a lean pop through the carb, too.

If it's backfiring from the pipes on deceleration, that's either normal (headers w/o pipes or mufflers) or also could be retarded timing.

If you readjusted the valves while running, I wouldn't worry any more about them- unless they get noisy and won't stay quiet after readjusting. That could mean the cam lobes/lifters didn't make it through break in.

Here's a page on breaking in the cam and lifters. See if you followed the procedure.
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