Hi i have a 95 blazer with the 4.3l vortec i recently took and had the heads ported and polished after putting the top half back together it will not start. The engine turns over gets fuel and fire there is between a 150 and 154 psi for each cylinder good fuel pressure at 62 psi to the engine which is better than most new cars. I am curious as to 1. if there is more than two ways to put the distributor in since it seems that it can only go in 180 out or in time to me and 2. if since the heads have been ported and polished do i need a new mass air flow sensor to allow the huge difference in air flow to the engine and out the exhaust.

 

Are all the plug wires back on the distributor in the proper places

 

Yes they are in order in the right firing order the right side of the cap goes 2,4,6,coil the left side goes 3,1,5
I recently pulled the plenum off and found that a fuel line to the the spider rail has started to leak didn't think that with that much pressure it could be the problem but it very well maybe. my plenum gasket had also cracked but i don't know why that would have happened considering it was brand new maybe it was faulty.

 

definately a leak in the spider will cause problems and a no start condition..if one of the lines has a hole in it it is time for a complete unit, its expensive around 300 bucks but will cure the problem, while your at it replace the fuel return lines too..(aka nut kit) and get a new gasket too

 

thanks for the help I have been thinking go big or go home lately and this gives me more reason to go big. I have already had the block bored over to a 350 put high performance cam in it and then I decided to do the transmission its upgraded to corvette status and has a beast sun shell with stage 3 shift kit, then entire fuel system has been upgraded as well all except the spider rail since it seemed to be handling the upgrades well with a chip. After all that I decided to do the heads and had the same local high performance shop port and polish them for me to match the lower end better. this has been the first time I have had any problems with it and I put it back together each when i had the other mods done. This thing should run like a champ after it has a new spider rail with more flow.