Sting 440 timing contradiction

[1970stingerracer12]

I found one link to a Cuyuna engine manual that doesn't come up, so I've been using the older JLO 440 manual. It gives timing as .083 to .102 before top center. The specs on my tool box cover say to set it at .110. Does this sound right to you "in the know" people? For now I just used the timing marks on the flywheel.
Gary

[weverat]

Rockwell Jlo Cuyuna engines with angled spark plugs - .083 to .102 I set these at .083


Verticle plug heads as used in the later models .102 to .112


The older style heads ran hotter and burnt pistons, so the timing was set lower

The modern hemi heads can handle the more advanced timing. With this style head I set my timing at .102

[1970stingerracer12]

Thanks weverat. That makes sense to me. We always used to advance our timing a bit due to the high altitude we ride at, but I'm a bit leery after hearing how easy these burn pistons.
Gary

[gonsagas]

Using ethanol will make these engines burn much hotter than non oxygenated too.