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#1
06-16-2016, 11:09 AM
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Some more info...It has the born with XH code 400 with 62 heads. All the recent mechanical work was done by John at Midwest Mechanical Specialties. He was recommended by members of this forum and did excellent work IMHO. It had the original transmission filter still on it when fluid was changed. I've got all the original parts that were not able to be reused. The car has spent it's whole life in the KC area and the 2 previous owners are available to contact. Owner 1 had the car 1969-70 and Owner 2 (family) had the car 1970-2009.
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69 Grand Prix Model J, Cameo White/Black top, 400-350HP, automatic, unrestored 53K-mile original paint 69 GTO HT, Matador Red/Red interior, 400-350HP, automatic, Hideaways, AC, PS, PDB, original numbers matching work in progress |
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#2
06-16-2016, 08:29 PM
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Run on pump gas?
Does it ping in the summer on pump gas? With those #62 heads the compression would be pretty high (unless it has dished pistons). I've had bad experiences with 62 heads and pump gas on these 400s.
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1974 Lemans Sportecoupe GT (daily driver) .030 over 354, #47 heads (84cc), Lunati voodoo 700 camshaft (207/213 @ .050), logs, 2.5 duals, X-pipe and Dynomax super turbo mufflers, 3.08 rear |
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#3
06-16-2016, 08:53 PM
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I've never noticed any pinging with this GP but remember it on my GTO with the same heads back in the early 90's. I always run at least 91 octane in the GP and don't drive it everyday. I believe the true compression with the 62 heads is 9.5-10:1 or less than the advertised 10.5:1. I think the 62 heads are around 75cc or at least that's what I've read on this site. I might notice pinging if I drove it more on hot days. I believe my GTO pinged back in the day because I couldn't buy at least 91 octane in our small town.
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69 Grand Prix Model J, Cameo White/Black top, 400-350HP, automatic, unrestored 53K-mile original paint 69 GTO HT, Matador Red/Red interior, 400-350HP, automatic, Hideaways, AC, PS, PDB, original numbers matching work in progress Last edited by Red69Goat; 06-16-2016 at 09:09 PM. |
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#4
06-16-2016, 08:55 PM
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Yes, they were vacuum in 69 and then electric in 70 I believe.
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69 Grand Prix Model J, Cameo White/Black top, 400-350HP, automatic, unrestored 53K-mile original paint 69 GTO HT, Matador Red/Red interior, 400-350HP, automatic, Hideaways, AC, PS, PDB, original numbers matching work in progress |
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#5
06-16-2016, 08:57 PM
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I usually throw in a bottle of octane booster but I don't think that makes much of a difference. I've been using the highest zinc content oil that I can find.
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69 Grand Prix Model J, Cameo White/Black top, 400-350HP, automatic, unrestored 53K-mile original paint 69 GTO HT, Matador Red/Red interior, 400-350HP, automatic, Hideaways, AC, PS, PDB, original numbers matching work in progress |
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