i own a 95 blazer ls 4x4 with the 4.3l vortec that has been bored from a 262 ci to a 350ci rebuilt transmission with upgraded shift kit, beast sun shell and corvette status in the rest of the tranny. recently had the heads ported and polished for better flow to match the lower end. Put it all back together and now it will not start had the 3 shops and the person how does all my engine work look at it and no 1 has any clue why it wont start. check timing but it appears that the distributor only goes in 2 ways 180 out or in time could be wrong please help. gets fuel and fire has 150-154 psi compression per cylinder and fuel pressure at the engine is 62psi. could this be the mass air flow sensor due to the heads? please help!

 

no help that any one can think of. Thanks for any time spent reading this will check again later tonight.

 

Can't offer any help..but welcome to the forum either way.
Just a tip - you only waited 19 minutes for a response...it's not a live chat, it's a forum. Sometimes you have to wait for your answer. I'm sure someone will be able to help..there are a lot of knowledgeable people on here.

 

Welcome to the forum. What bore x stroke are you running in that??

As far as your problem, search for "EDI engine timing" and you should find the information you need to get it properly timed. If you cannot get your rotor to line up with the tab in the base of the distributor, you will have to turn your oil pump drive shaft a bit to allow it to seat in properly.

 

Welcome from South Carolina

 

thank you for the advice and sorry if it seem i was being impatient i had posted the same question on on a different forum with no reply s 2 hours before and thought i would post it again on here afterward i went out and took the plenum off and found a crack in the fuel line to the spider rail and that my new gasket was blown. who would have thought that you could still get 62psi with a leaking fuel line to the spider rail and i can not think of any reason why the plenum gasket would have blown.

 

Welcome! from the west coast of New Zealand.

 

welcome aboard!

 

Welcome From Pennsylvania.