360 build.

Wyrmrider said
if it's not the stem seal then it's the rings
new seals should even seal bad guides- for a while
do a leak down test
I can't remember the thread but if this is just a temporary motor till you build a 360 you can take it apart and clean gently remove the ridge, hone, knurl the pistons and slap on a set of cheap rings -depending on what you find when you mic the bores
if those are KB pistons remember to set the ring gaps for those pistons
you could also move the rotating assembly to a different block and save the cost of pistons
but you would have to bore the new block for these pistons
that compression is way off for those pistons and it will never run right with that much oil
was this balanced or do you know
if the plugs are fouling and you have to limp it along for awhile try Champion RFN14LYC or
Champion 82 Spark Plug RFN14LY

I think the seals did hold for a short while. But not for long, ie a matter of days before I noticed the smoke was back. But Im not 100% of this, which is frustrating to say the least.

I'd have to look into how to perform a leak down test, cheers. :)

The 340 still screams. It rips right up to 5000rpm and the porting I did on the 587 1.88" Valve heads and the .060" Mill seems to have made a noticeable difference. The main reason for pulling it is the blue smoke and fouling issue. If I could simply change the Heads and stop this issue the 360 could go on the back burner and get some nicer bits. :)

The 340 is stock, not KB Pistons. Just crappy 1973 Cast ones. :D

I'll try those plugs for sure. :) Cheers.