1969 351w backfiring through carb

[Lemon Owner 11]

Glad you got it going. Does that mean it had a 302 cam instead of the 351?

[jas_stang 10]

yes, it has a 302 cam non H.O. Between the different cam and the defective distributor it threw me for quite the loop. It sounds great now and I have alot more to do to get it road worthy but that was a good sound to hear it run.

[1969 Mach1 14]

Great to hear its running god. It is unfortunate the previous owner of your car put a 302 firing order cam in your 351w. I could be wrong but I heard Ford used a different firing order on 351w's because the 289-302 firing order of 1-5-.... put too much load on the front main bearing. I know a long time ago before there were many 351w firing order cams available my older brother had to install a 289-302 firing order cam in a 351w. After about 10k miles it developed a main bearing knock in the front of the motor. Not certain, but we thought it was because of the cam firing order.

[klevor 10]

Back in the day that was all you could get from some of the parts places. But now it is different. I remenber having to use one for a rebuild in my 351 stang and got out out as soon as I could find a suitable one with correct firing order. Because of the same thing 1961 mach1 is talking about.