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Original Message
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| What is the compression in the cylinders? |
| By Dave Shoe - 04/30/2003 3:32:15 PM; IP 12.104.160.195 |
You've got a good mix of components in there, however the non-stock Mellings pump requires that you restrict oil to the heads.
If you have instected the valves recently, then compression should be good - be sure to prop the carb wide open and remove all spark plugs when you run the test. A leak-down test will also tell you a lot.
I'd also advise running a basic Pertronix pointless conversion with an otherwise stock ignition system. A bad set of points or a leaky condenser can be a pain to live with. Don't go with the fancy Pertronix models - keep it simple. I'd also replace the distributor cap, rotor, wires (use a quality wire like Belden, not a fancy advertising glitzy packaging wire that often fails to insulate properly, and new spark plugs. A fancy coil can be big problems if you don't have the basics nailed, so stick to a stock coil - they're great on gasoline engines.
Tell us more about the cam. Are you using 390 truck pistons, or did you swap in car pistons? Does it ping? When was it rebuilt? Does the exhaust leak anywhere?
The type of backfiring you have can isolate the engine problem. If you can describe exactly how and when the backfire(s) occurs, what it sounds like, and any other info, we might be able to offer better info. Does it backfire through the carb? THrough the exhaust? Only on decel? The more you offer, the beter chance we have of discovering the clue that is making it run bad.
Shoe. |
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