Fuel,air,spark and no start

[Pledger88]

hello, I just picked up a 89 mj 2wd with a fresh rebuilt 2.5l. I bought it from a friend but it won't start, i get air,fuel and spark but it don't even try to fire. I've checked timing and its correct. Need some guidance on where to go from here.

[Dzimm]

Your positive timing is correct?  If it's 180* out it will seem like it's correct but won't be making compression.  I would check your compression and double check your timing.

[Pledger88]

Distributer timing is correct. Piston 1 on tdc compression stroke the rotor bug points at cylinder 1 on the cap. If I set it to 180 I can hear it try to start for a second. The timing gear Mark's line up and when I set cam gear at 1 o clock it puts the crank gear at 3 o'clock and I have 20 pins between the 2 Mark's. 

 

[omega_rugal]

if you have spark, fuel and timing is right, something is wrong with the valve train...