[Rovernet] P5B V8 ignition timing

[Jon Stanley]

Hello all,
I'm trying to tune a stock early 67 P5B V8 with high compression 10.5:1 and
is currently set to factory setting of 6 degrees BTDC. The non ethanol fuel
I have access to around here in Texas is 90 octane, and adding in a boost
probably pushes up to around 92, but the engine was designed and tuned for
100 octane.

I'm curious if anyone here has a high compression V8 and what timing they
set the engine to and what fuel? Some sources say retard the idle timing
possibly all the way to TDC?

Right now the engine runs poorly when cold and on choke, but eventually
once warmed up seems to run well. Both carbs have been rebuilt.

Regards,
Jon
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://rovernet.org/pipermail/rovernet_rovernet.org/attachments/20250911/c8585943/attachment.htm>