351 Cleveland back fires at low rpm
Upon my purchase I was aware I had tuning to do on the Cleveland!!
Launching into what works and doesn't.....I found a few things. The distributor and coil is Accel electronic not stock. 351 is suppose to have the rotor set toward the carb??? true? the Distributor cap should have number 1 toward the left side behind the distributor clip sorta as well??? true or myth?
I am getting backfire at low rpm and acceleration. Past about 1500- 2000 rpm's she perks right up runs and sounds very smooth. I set the timing mark and pull the cap. Rotor is dead on the number 1 plug at 180 out...but get this firing order on the cap is set closely to the 302 set up NOT the 351. I'm scratching my head thinking with a great engine ..WHY do that? could it be spec's on the cam require a different method for timing?
the spec's on the cam are
224 duration at 50
282 advertised duration
108 degree lobe separation
2v heads and eldebrock performer intake HOlly 3310 carb "750"
Just before I decide to pull the distributor to reset it.....
so she's running smooth......then while idling ....the rpms increase by itself (never did this before) ...then die off. NOt die as in abrupt but as if it ran out of gas. A very slow run down, it does start back up no problem. Does it AGAIN.....I look at the gas gauge and it looks very near empty. I go buy some gas it starts back up.
Runs fine for a few minutes, then it does it again. THIS time it won't hit....spins as if it is not getting fire. The carb needs rebuild so I check and it is getting fuel.
OH and the plug wires etc are very new, vaccum hoses appear to be in good order etc..
Coil is my best guess...what say you????
"After all ......looks ARE important"
1967 Diamond Blue Convertible all original survivor
1971 Mach I: 351c,Performer intake,Holley 750,Doug Thorley headers,duals (of course)Flowmasters, Accel dist/coil, MSD brain,Isky Cam .517/ADV Duration 280@ .050 Duration 232 LC 108, FMX with shift kit, 2800 stall, 3:89 gears:hihi: