1973 340 issues.

nm9stheham said

I would really suggest you do the check with the air in the cylinder before pulling the head. Once you pull the head, you have lost the opportunity to pinpoint the problem better, and may be back to pure guessing.

IMHO, lapping the valves is not going to do much. It might bring up a few good cylinders a few more points but the guides are probably so worn by now as to render lapping useless. If anything is bad enough to drop #2 to 23-30 psi cranking, lapping is not going to fix it.

And those compression pills were in the same category toilet paper oil filters LOL

Click to expand...

Good point. I'll make sure to do the Air Test first. I assume I can use the Compression Tester Hose and a bit of rubber between it and the Air Gun?

Corrently Im running Sea Foam in the Crank Case and done a hot soak in the carb and I away to do a second Hot Soak now then Ill do another Comp Test to see what, if anything the ATF mix and Sea Foam has done. :)

Again, this is more out of curiosity than anything before I start anything serious.

I fractured my thumb last night too and had to go to A&E and Im now in a support with a black and blue hand so I m limited to what I can actually do just now anyway. :(