i have a chevy 350,standard bore engine,4 bolt main.comp cam 270 h-10 grind.edelbrock 600 carb.410 gears,4 speed saganal tranny in a 68 firebird...engine runs good then out of nowhere it starts to backfire under load.after it has run for about a half hr.ran good all last year.just startind doing this.i would be thankful in any body can give me a direction to go to figure out the problem.can this be timing or carb.thanks in advance for your comments
↧