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I did pull the valve covers and every cylinder was functioning. The one before me has been trying to get it to run for 3 years. Good chance something assembled incorrect, or maybe oil without zinc has been used. 

Update- all the easy ones eliminated. I have her at a shop. We got it running but it’s up and down like half the cylinders are working. Mechanic thinks maybe timing chain incorrect.

Will do 

Timing is direction I’m going thanks for all the replies I’ll add posts as I go. Great to have this site. To the guy in Michigan your red Mach is super sharp. I have a friend with a m code 4 speed strong engine👍 

Sound advice thanks. Watching that fire come out the tailpipe not a good feeling. The engine is the h code 2barrel and has had the edlebrock 4 barrel installed. I’m gonna plug the vacuum port temp. To eliminate that as my source of back fire. I’ve been doing the blow your finger out of number...

I have recently purchased a1971 Mustang Mach 1 with a 351 Cleveland. I haven’t been able to get it running yet. New points, condenser, coil got it started. I keep getting a backfire on the 1-4 side. Have shot fire out the tailpipe a few times. Cyclinder 1 and distributor line up tdc does not...