What is the timing for a 1986 Chevy 305?
here the best answer i can give you on the timing of a 305 Chevy engine i seen timing on these engines from 0 to 13 btdc the best way to set the timing is to disconnect the est plug and start the enginge and very slowly turn the dis. and listen to the engine until it runs the smoothest then turn it off and reconnect the est plug and try restarting it it should start nicely if not then you need to readjust the dis. my 305 which is a 1985 is happy at 12deg. btdc. but is built up a little and no poluion bull on it
Mine runs good at 8-10 BTDC
Depends on what the 305 is in, a 305 camaro engine needs like a 9 tooth starter because the fly wheel is 12.75 inches in diameter with 50 some teeth. A 305 in a Chevy half ton will have like a ten tooth starter for the 14.25 inch diameter flywheel that has like 60 some teeth. All 305 engines before 1986 are the same they did have different flywheels for what ever Chevy put them…
There is a mark on the timing chain cover behind the harmonic balancer(behind the crank pulley). The harmonic balancer also has a slot cut in it so that you can line the crank up with the mark on the timing cover. The mark on the timing cover should sit at the 2 o'clock position or the 12 o'clock position. My 96 Chevy 305 is at the 2 o'clock position.
The only thing I can think of is that the timing tab on your engine has been removed. The hash mark should still be on the balancer, but may be obscured by dirt, grease, or accessories. You might be able to get a new timing tab from an auto parts store or dealer. Some professional quality timing lights have a timing readout, which would eliminate the need for direct reading.