1977 360 replaced timing belt and am having trouble getting the distrubter set correctly any tips or web sites on this problem Will run but backfires out of carb,

Cranking at a slower speed is often a sign of being out of time. That might explain the popping and backfiring, too. You need to use a timing light. Make sure it is set to specs. If it is set at the correct time, and the advance is working (you can check that also with the timing light), and the problem still exists, then I would recommend doing a compression test of the cylinders, to spot any problem with the engine's mechanical condition.

When you put new points on, did you also use a new condenser? You certainly should. And since the points burnt out, how about the spark plugs, do they need changing as well? Part of a tune-up is to make sure the gap on the spark plugs is correct.

If you are inclined to work on your car, buy a vacuum gauge for just a few dollars. These are real handy for the older cars. Here is a link on how useful it can be:
hmm, little difficulty...go to secondchancegarage.com , look at their menu and choose "How to Use and Interpret a Vacuum Gauge". A neat little tutorial on what you can see from a vacuum reading.

chain or belt
recheck timing marks on the cam and crank align
turn clockwise twice if the timing marks are out
it wont start and backfire

make, model, year? backfires are spontaneous burning (exploding) of unburnt fuel outside of the combustion chamber. suspect bad spark plug/s, ignition coils, ignition timing, computer, leaking fuel injector, etc. scan for trouble codes, then post back. because the problem is intermittent, problem manifests only when hot (engine at operating temperature) do tests for both cold & hot conditions. test resistances (ohm) of suspected sensors: cam & crankshaft position sensors, ignition coils (if possible),(search the web for the recommended procedures). also test voltages at the computer (search the web for the pin outs of the computer of your car). also check associated relays (like for the fuel pump, etc.) a bad relay may have its coil open when heated, then becomes good again when cold. i suspect the car may have a good fuel delivery but the sparks are not coming in on demand, thus backfiring.

In general, backfiring indicates the cam, crank and ignition are out of time or out of phase. The timing marks on the crank and cam just line up the timing of the cam and crank. The alignment of the spark with them has to be phased at the right time too. Check the manual for how to set the distributor timing after an engine repair

I believe the water pump driven by the timing belt. You probably have the belt timing set up incorrectly. Valves need to open when the piston is in the correct place or the engine will not run. Recheck belt timing.

it usually is the tensioner replace it

i put a new distrubter in and set the timing it saiad top dead was no4.but it still backfires
92 cheve blazer vortec v-6

I'd check cylinder compression and go from there.

If the belt has slipped you might be in trouble, becuase it's an interference engine.

Hi, You need to get your timing belt checked. Dont attempt to start the engine until your timing pullys are reset because if your cam is set wrong it WILL cause valve damage.If it is allready correctly set then i suggest you test the compresion in case damage was caused when belt was fitted. Hope all works out ok 4 you.All the best.Phil