Re: c3 motors
So sad... Finding a car that I liked was one of my challanges as well but it is part of the fun. Good luck!
So sad... Finding a car that I liked was one of my challanges as well but it is part of the fun. Good luck!
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c3 appraisal service
can any one recommend an appraisal service in the south jersey,philadelphia area please?
Thank youComment
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Re: c3 motors
can any one advise suffix for 1970 350/300 auto w ac?Have checked the net and can not find one.So ,would the car have after market ac?Thanks.Have located a professional inspector but can cancel if the car is not factor air.Any help would be appreciated.Thank you.Comment
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Re: c3 motors
The suffix for a '70 300hp 4 spd is CTD, and the auto is CTG. The NCRS Tech manual doesn't give any differentiation for A/C cars in the 300hp group.Comment
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Re: c3 motors
thank you JeremyComment
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Re: c3 motors
The seller should be happy to confirm that the AC is factory; if he seems equivocal, then it's probably not factory.
GM AC compressors of that era have six axial sliding pistons (three double ended), and look like a large cylinder or generator. The 70 350/300 engine has the AC compressor on the top, passenger side. The compressor will have a large square green, black, and silver sticker visible on the top surface. Have the seller send you a picture of the engine compartment...if it has factory air, it should be obvious.
Consider only factory air for future value and cooling performance. GM put a huge radiator in the AC cars pretty much guaranteeing small blocks wouldn't have a cooling problem if the system has adequate maintenance.Last edited by Chuck S.; December 12, 2009, 11:21 AM.Comment
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Re: c3 motors
Chuck
thanks,seller did confirm and I do not have my 1970 manual yet,but am getting an independent inspection done Tuesday to check out integrity of the car on all levels.
Thank you.Everyone has been so helpfulComment
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Re: c3 appraisal service
Contact Terry Shaw,
Wouldn't think of using anyone else!
KevinComment
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Re: c3 motors
I provided some engine system engineering assistance to a member with a '69 300 HP, TH400, 3.08:1 axle. The '70 is basically the same. Somewhere along the line it got a set of small valve (1.72/1.50") truck heads. The power peaked at about 3500, and it was wheezing at 4000.
He found a proper set of OE heads, massaged them, had the valve seats refreshed, converted to full time vacuum advance, and quickened up the centrifugal advance curve. I drove it after the work was done. Loading the converter at a dead stop would light the tires. Punching the throttle from a dead stop just hazed the tires as it dug in, took off, and pulled strong to 5500. Perfect! The changes probably increased peak power by at least 25 percent and added at least 1500 revs to the useable power bandwidth.
The 300HP/TH400/3.08 axle combination is a very nice set-up for cruising and touring - about 90 percent peak torque at converter stall speed - reasonable fuel economy (especially if you convert to full time vacuum advance), and is no slouch at the top end with some head work.
DukeComment
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