I've run Optimax from day 1 with my 351 10.5:1 compression. Mine was built for PULP. 20,000k's without a since issue engines still spotless internally too.
I find mine runs a lot better with a 50-50 mix of Avgas and Optimax, it has never been happy on straight Optimax and the engine dyno guy wouldnt run it with straight Optimax
The older leaded heads are slower burn tech but the newer heads are of fast burn technology with ulp versions. So you'll have to run with less timing/ advance curve..With out lead which slowed the burn some..
Mutlley,
I have an old ZH with standard heads (no hardened inserts) and have been running on BP Ultimate for 2 years now and the car has only gotten better. However, I do put 40ml of additive each time I fill up. My other car has the inserts and I am also running BP Ultimate with no additive, all appears to be fine
thanks all for the help, i will give it a go next time i fill up
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