Wait, wait, wait...
I know the answer to this one!
I'll have Chevy motors for $1000 Alex.
I just went through this. Let's assume that the motor WAS running fine until one day at WOT the thing started backfiring through the carb...
Check your spark plugs and boots. Last month this happened to me and it was 3 cracked spark plugs and burned out boots.
Last weekend this happened to me and it was burned out boots, (3).
What gives? I don't know at this point, but I replaced the boots and now everything is fine.
Me? I'm thinking that the plugs I have are too hot. When I pull them, they look to be text book perfect. But I can't explain the burned out boots and the previous cracked plugs.
OR...
It could be the distributer cap, seen that too many times.
As for the secondaries opening up, or not opening up that is, they won't unless the motor is running right. If the motor can't take the fuel, the butterflies will just kinda flutter.
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GeneD
007
Melbourne, Florida
[This message has been edited by GeneD (edited 05-09-2000).]
GeneD
007
Formerly of Melbourne, Florida
Permanent Resident of St. Petersburg, Florida
1966 Classic 18-2+3