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Fuel Additives???

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GAS455:
Do you guys run fuel additives in your old cars??

In the '60 Ponti, I have an Aluminium  Headed 455 and run on BP Ultimate only.

In my '60 Caddy which is all stock....  I ahve been running only BP Ultimate,   But don't know if I need that fuel, or if I should be running additives when I fuel up.

bonnevista:
Greg, I can only say from the 200,000 miles I put on my '64 Bonneville, 99% of that was on LPG.  
When I tore the engine down, the heads were pretty good.  You could have serviced them and got another 200k out of them.  
BTW, that 200k was milage I put on that engine. It was a used engine when I got it.

sms777:
The only reason fuel additives required in early 60's engines because todays fuel no longer contain lead. Early engines do not have hardened valve seats and lead in fuels acted as a cooling agent. Your alloy headed Ponti is late model head with the hardened inserts alreday installed. Running higher octane fuels in early engines will have no added benefit unless you are using additive as well. Additive gives you protection against burning valve seats.

Cheers, Chris.

GAS455:

--- Quote from: sms777 link=topic=3453.msg21020#msg21020 ---The only reason fuel additives required in early 60's engines because todays fuel no longer contain lead. Early engines do not have hardened valve seats and lead in fuels acted as a cooling agent. Your alloy headed Ponti is late model head with the hardened inserts alreday installed. Running higher octane fuels in early engines will have no added benefit unless you are using additive as well. Additive gives you protection against burning valve seats.

Cheers, Chris.
--- End quote ---


Hi Chris,

So in my stock Caddy,  I will be fine running the normal unleaded 91 or 95 with the additive?
I can't remember what the additive is called.

Greg

sms777:
No problems Greg, one day when you decide to do a freshen up on the top end of your engine just get hardened seats fitted to the exhaust valves and you will not have to use any additives again.

Cheers.

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