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#1
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1970 Grand Prix 97 Research Octane
Hello All, New comer here with a question. Just acquired a 1970 Grand Prix with a 400 that had been garaged for the last 20 or so years. After a little bit of tinkering and a new timing chain set it's back on the road. My question is in regards to the sticker on the fan shroud stating " Engine Modified To Use 97 Research Octane Premium Fuel ". It states that this is a factory modification. Could anyone enlighten me as to exactly what that sticker means ? Any help would be greatly appreciated. Thx, Mike |
#2
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Interesting.
I only heard of it on chevy. Was this car an export car at one time? Very good looking GP.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#3
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Hell John,
Thx for the reply. The car was bought down in Jersey and to the best of my knowledge never left the states. The tag is correct though. If we don't run Race Fuel or Octane Booster it pings. Thx, Mike |
#4
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Sounds like a dealer added an advance curve kit in it so that the timing comes in quicker. If you didn't want to deal with race fuel or a mix you could take a few degrees of timing out of it and run premium pump gas. You'll lose a little bit of power but it will be power you'll never notice at regular street driving.
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#5
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We did try taking a few degrees out of it but still pings.
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#6
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One of my cars has 12.85 CR and runs C-12 at the track. I take 6 degrees out and run pump gas on the street with no ping. I'm sure you don't have 12.85 CR
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#7
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Today's octane numbers are an average of Research Octane and Motor Octane. Research numbers are higher. You'll see the formula on the pumps (R+M/2)
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey 1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles 2017 Sierra SLT 1500 Z71 4X4 2019 Canyon SLT Crew 4X4 |
#8
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The manual it refers to on that sticker is the Delco United 60A-100. This manual is primarily the standard Delco parts catalog for non-GM dealers (auto parts stores etc).
Must be some kit they were selling in the day to allow a high compression engine run on lower octane fuel. typically thought of for countries without high test but some people here did it for other reasons, saving money by buying regular fuel etc.
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My Break Away Squad 1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops) 1969 LeMans (2dr & 4dr Hardtop and a Cvt) 1969 LeMans Safari 2 seat Wagon 1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop) 1969 Catalina (3 Cvt’s & a 2dr hardtop) 1969 Ventura 2 Seat Wagon 1969 Executive 4dr Sedan 1969 Bonnie Cvt 1969 Bonnie 3 Seat Wagon (2 of them) 1969 Bonnie Brougham (4dr Hardtop & Cvt) 1969 Grand Prix SJ (2 of them) 1969 2+2 2dr Hardtop (Canadian model) |
#9
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Thx for the replies. We did do a compression check after installing a timing chain set and they were all around 210-225 with the throttle wide open.
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#10
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btw, 97 research octane is about 91 by the average number used on American pumps, which was the rating for regular leaded back then. The fact that they refer to Research on that sticker does make me think the sticker was for a kit designed for use outside the US or Canada. Perhaps the original owner of the car had to use his car in latin America where they only had regular fuel?
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My Break Away Squad 1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops) 1969 LeMans (2dr & 4dr Hardtop and a Cvt) 1969 LeMans Safari 2 seat Wagon 1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop) 1969 Catalina (3 Cvt’s & a 2dr hardtop) 1969 Ventura 2 Seat Wagon 1969 Executive 4dr Sedan 1969 Bonnie Cvt 1969 Bonnie 3 Seat Wagon (2 of them) 1969 Bonnie Brougham (4dr Hardtop & Cvt) 1969 Grand Prix SJ (2 of them) 1969 2+2 2dr Hardtop (Canadian model) |
#11
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I am the second owner of that car. To the best of my knowledge that car never left the U.S. but I will ask his family tonight. Thx again.
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#12
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Was it ever in California? Mid-70s had some weird stuff happening there.
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So long, farewell. |
#13
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Only thing going on in California was the NOX kit that was required for 55-72 vehicles. Ram Air cars for some reason or another were exempt. My local 76 station proclaimed my 68 as a Ram Air car and I received an exempt sticker.
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Ed 1968 GTO (Thanks Mom) 2006 Silverado 2007 Cadillac SRX 2015 Chevy Express |
#14
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How many cranks/revs? Terminal compression possibly that high.
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Steve Naresky |
#15
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Cranked around 6-8 revolutions on each cylinder.
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