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12-01-2009, 05:25 PM | #121 | |
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Re: '66 Dodge D-Dart at Mecum auction
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Check this out http://www.cometeastcarclub.org/Comet_HIPO_65.html |
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12-02-2009, 12:50 PM | #122 |
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Re: '66 Dodge D-Dart at Mecum auction
Alan,
Nice Comet. Putting together some detailed specs. for the D-Dart. Will post later. As for the 7 1/4" 1965 rears. Gear ratio's 2.76....2.93....3.23.... 3.55....3.91... for the Hotchkiss Drive. Not sure if anyone made steeper gears...But, the 1965 Cuda "Goldfish" of the Hamilton Motors "Golden Commando's" ran In F/Stock in 1965 (12.50 - 13.99 wt/hp break). Won the F/S class at the 65' NHRA Nationals. And, held the F/S record with a 13.44 @ 103.68. Ran 4.89 gears, in an 8 3/4" Sure-Grip/Posi. They went AHRA in 66'. Paul |
12-03-2009, 02:40 AM | #123 |
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Re: '66 Dodge D-Dart at Mecum auction
Alan,
The D-Dart engines were assembled at Chrysler Industrial. Though the Camcraft camshaft is stated as a .495/.505 lift, in actuality it has a lift of .504 Intake / .515 Exhaust.... According to NHRA technical, the intake and exhaust valves on both the 66' D-Dart and standard 273/235HP Commando engines are the same size. (1.78 intake) and (1.50 exhaust)...The cylinder head chambers were measured at 57.3cc... Currently (5) different casting # heads can be utilized, all with the same valve size, #2455315,,#2658920,,#2843675,,#3671585,,#4323302.. The intake port sizes equal 1.70 sq. inch and the exhaust port 1.25 sq. inch. Paul |
12-03-2009, 07:52 AM | #124 | |
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Re: '66 Dodge D-Dart at Mecum auction
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12-03-2009, 10:21 PM | #125 | |
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Re: '66 Dodge D-Dart at Mecum auction
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Paul, According to an old parts casting book that I have, that Galen put out, the 2658920 cylinder head castings for 1966 had 1.87" intake valves --- P/N 2536176. In 1967, the same castings had 1.78's --- P/N 2806213. The cars were built on April 17th. The engine ID boss on Politician engine is stamped either R-273- 4-27 or it might be B-273- 4-27. The one on the Mecum car (my old car) was stamped R-273- 4-26 or B-273- 4-26. The bottom portion of the B or R is missing. If the 4-26 and 4-27 are the dates the engines were built. Where, when and who installed them? Here's a picture that I got from the D/Dart web site moderator. It's of the Porach D/Dart when they first got it. I had asked them about the headers, hurst shifter and possibly a Sun tach being in the trunk at the time of delivery. It's definately an Inland shifter. You can caption it as you want. |
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12-04-2009, 12:00 AM | #126 | |
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Re: '66 Dodge D-Dart at Mecum auction
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12-04-2009, 12:01 AM | #127 |
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Re: '66 Dodge D-Dart at Mecum auction
I'm curious as to whether a 1.87" intake valve would clear the cylinder wall on a (small-bore) 273 without relieving some of the material from the cylinder wall.
Might that be a factor?
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12-05-2009, 09:14 PM | #128 |
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Re: '66 Dodge D-Dart at Mecum auction
Here is a picture of the copy of the letter that NHRA sent out on the 8 3/4 rear. The actual reason that the factory started putting the 8 3/4 in the 65s is that owners of the 4 speed cars were destroying the 7 1/4 rears. Ma Mopar got tired of replacing the weaker rear under warrenty. Not all the 4 barrel 273 cars got the 8 3/4, only the 4 speed cars.
Last edited by dart4forte; 12-05-2009 at 09:18 PM. |
12-06-2009, 06:19 AM | #129 |
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Re: '66 Dodge D-Dart at Mecum auction
Alan,
What you said does make sense. 8 3/4' for 4-speeds, and the 7 1/4" for automatics in 65'. I would imagine many of 65' 273 Commando 4-speed Darts and Cuda's in early 65' never drove home from the drag-strip. Got brought home via a chain. I will post some valve clearance info. You have to check the photo's of the cylinder head (valves and combustion chamber) in the Ted Spehar Dart, on the D-Dart site. Those intake valves are not 1.87". They are definitely 1.78. On the bottom side of the head, a "2" is stamped within the indentation. Not sure if that indicated anything special. On the engines, again put together at Chrysler Marine & Industrial. Paul |
12-06-2009, 07:53 AM | #130 |
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Re: '66 Dodge D-Dart at Mecum auction
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