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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: 22RE on Premium
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Thu, 08 May 2003 04:00
 
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for the record, i've been running my 4K with early 3K head (between '70 and '74) for the past 4 years on PULP (98 octane stuff). no problems with pitting or damage. this is with big cam and 10.2:1 CR and much abuse.....
way back when leaded was phasing out, we (oldcorollas ppl) contacted toyota about which cars were ok for unleaded. they said the only issue was the octane rating and all toyota engines after (at least) 1967 had hardened valve seats, and were ok for unleaded petrol...
the only cars that can't use premium unleaded are ones with soft valve seats or none at all, adn these are usually american cars or holden/fords.....
if anyone has a spare valve seat they want hardness tested, send it to me  you can have vickers, brinell, microhardness (probably best here)... whichever...
anyhoo, if a 1970 K engine is ok, i think most others will be fine too.
Cya, Stewart
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