Thread: Need our engine experts to help me out.

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Originally Posted by Itoldyouso

Yep Pat, firing order is now 351 order because of the cam. .

What do you mean .008 is "thin?" Is that tight or loose?

Thanks for the help Pat.

Don

i did not think the bottom of bores would be hitting but you never know as for black mud or past could be molly lube . or your making iron past were some thing is cutting in to the block, what is your cam ? roller or flat lifter . the cam could be moving ??? front cam plate on the block ? i seen were a guy used the wrong fire order on a 351w made a low thunking sounds he was going nuts .i moved his plug wires a round 008 is tight like to see abit more

It's a roller cam with new Ford Racing roller lifters. That's the thing that has me puzzled, the ONLY used part on the entire engine is the block and it has been totally remachined. Every other part is brand new and matched. I've built engines with lots of used parts and haven't had this sort of problem.

The cam has it's front plate installed, so I don't think it is walking. The one thing I did notice is that my new Comp Cam timing chain now has some slight slop in it, where it was tight when I installed it. I know they stretch out a little, but this seems too soon.

Don

Don, you listed that you have "flat top" pistons. Is it possible that one piston is reversed, with the "pin offset" going the wrong direction? They will knock just like a rod knock sound. Just a thought.

Good luck chasing it down.