[greenmonster1970]

Hello everyone. I have a 70 Monte 454. It’s been built; almost 700 hp. Has a dominator for a carb, dart heads, victor intake. It’s alway been hard to start. I always had to pump the you know what out of it to get it to start. Well I’m the fall I started it and it was backfiring like crazy. Well I shut it off and it hasn’t started since. It’s getting plenty of spark. Today I replaced the coil and ignition module, cap and rotor, and battery. Tried to start it. Popped once thru the carb; that was it. Doesn’t turn over that fast, so I stopped trying. Don’t know what else to try.

Do I pull valve covers and look for something broken or not moving? I should say I hardly drove the car. Thanks for any help. I appreciate it.

 

[BogiesAnnex1]

Sounds to be out of time whether that is ignition, camshaft or both. Big cams are really sensitive to this.

Your going to have to wander through this by hand cranking with a wrench the engine, ignition off, to first determine where the rotor aligns with the number one distributor terminal in crank degrees. I hope since this is a high performance engine that it has a damper marked in degrees at least through the first 90 followed by every next 90 degrees position so you can get a decent idea of where the spark is occurring relative to crank position.

The problem here is that if off where it should be can be the cam falling out of time which is usually incorrect installation set up, or wear, or breakage of the timing set, or is within the distributor itself. The latter can be simply miss timing the distributor set up, parts within failing or falling out of synch to wear in the gear mesh with the cam to worn to failing bearings within the distributor.

First thing is to devine where the ignition timing is to crankshaft position might be and most likely it never was timing exactly right Hence never ran right from day one. Stabbing the distributor for either the SBC or the BBC is something of a witch’s art if you don’t know some simple tricks.

Bogie

 

[Moosecountry]

do you have a steel roller cam? Maybe the gear (bronze) failed. Ive had that