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Author Topic: Gas type  (Read 1086 times)
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« on: September 27, 2013, 09:32:03 PM »

About to purchase a 67 camaro with a 427 engine. Is 87 octane ok to use for cruising around town?
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« Reply #1 on: September 27, 2013, 10:39:47 PM »

That depends on the 427.. and the compression.   *factory* 427's  ('66-'69) were built with higher compression (10.25:1 or higher as I recall) and would not run very well on 87 octane; probably would not run well even with 93 octane.   But your engine has probably been rebuilt by now, so you should check with the seller as to the compression ratio and what fuel he runs.  Go for a ride, listen for pinging or detonation... which is bad...

Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
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72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan
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« Reply #2 on: September 28, 2013, 07:22:05 PM »

One rule of thumb is the lowest octane that doesn't cause detonation. There are many variables that could matter. Cam and compression for starters.  If nothing else try small quantities from high octane to low. When you get detonation, back up to the next higher octane.

69 X11 Z21 L14 glide
looking for a 69 export model (KPH) speedo
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« Reply #3 on: September 28, 2013, 11:05:15 PM »

You might also stay away from ethanol, too. Stuff loves to eat rubber, nylon, gaskets and gas lines, needle tips, your pets, and has an affinity for water. Find yourself a station in the area that sells real gasoline. Buy a good performance additive, or tetraethyl lead from that guy in Georgia (if he still advertises it). Hard to find hi-performance high octane unleaded fuel at the pump any more - there used to be a couple of stations locally that sold Turbo Blue, but they are long since gone. I miss the smell of Holley aspirated 102 octane leaded gas - my eyes still water from the odor. Probably lost a few brain cells because of it, or maybe that was the other alcohol (non-ethanol).


1968 Z28 BRG/W
1969 Z28 X77 LeMans/W
1969 X66 L78 Cortez/BVT
1969 Z11 L48
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« Reply #4 on: September 30, 2013, 01:29:03 PM »

So did this the same car that did not have a trim plate?
Gasoline wise I would agree with has been previously posted, I would say the chances are very slim 87 would be satisfactory for your motor. Even my 396 325hp block which is 10.25 compression ratio (mild) and if I run less than 91 octane it pings and there is obvious pre-detonation while cruising. If you were only going to put gas in it to get it on the trailer or moving it around the shop then 87 may be ok IMO.

1969 garnet red Z/28 46k mile unrestored X77
Looking for 3192477 (front) spiral shocks 3192851 (rear) please
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Looking for original Delco side post negative battery cable part # 6297651AV
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