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Old 08-20-2021, 10:11 PM
frankk frankk is offline
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Default A 12 cars factory redline

What was the factory redline for the A 12 cars
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Old 08-20-2021, 10:31 PM
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5000 RPM. The 440+6 was not a high rev engine.

When Ronnie Sox drove one for Chrysler he said he was shifting (no clutch) at 5400. Air Cleaner Assembly removed, rear tires set 10 lbs lighter. 4.10 rear. He ran an ET of 12.98 after a handful of tries.

The only "high reving" stock engine that Chrysler offered was the 340 Magnum. Shift at 6000 RPM

Last edited by Lee Stewart; 08-20-2021 at 10:39 PM.
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Old 08-20-2021, 11:01 PM
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Never knew of Mopars using solid lifter camshafts. except the Hemi was a different story and the Slant 6. My 62 Slant 6 had the solid lifters. Even the 340 68-69 engines didn't use a solid lifter cam. Just not high revving engines. Always good top end horsepower with good flowing heads.
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Old 08-20-2021, 11:38 PM
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Not only didn't Chrysler use solid cams for their performance engines (Street Hemi started with a solid then changed over to a hydralic) they also didn't use high compression (1967 - 1970).

340 and 340+6 = 10.5:1
383 Magnum = 10.0:1 (lowered to 9.5:1 in 1970)
440 Magnum = 10.1:1 (lowered to 9.7:1 in 1970)
440+6 = 10.5:1
426 Hemi = 10.25:1

Last edited by Lee Stewart; 08-20-2021 at 11:41 PM.
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Old 08-21-2021, 12:11 AM
frankk frankk is offline
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Thanks guys.......surprised at the c/r
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Old 08-21-2021, 12:13 AM
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I wonder what the Hemis were turning for revs in Nascar at sustained high speeds. It seems like a Superbird at 200mph would be turning more than 5,000 or 5,500 rpm but maybe not.
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Old 08-21-2021, 12:14 AM
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Was a 273 commando a solid lifter 275 hp. Thanks
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Old 08-21-2021, 12:17 AM
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Quote:
Originally Posted by Lee Stewart View Post
Not only didn't Chrysler use solid cams for their performance engines (Street Hemi started with a solid then changed over to a hydralic) they also didn't use high compression (1967 - 1970).

340 and 340+6 = 10.5:1
383 Magnum = 10.0:1 (lowered to 9.5:1 in 1970)
440 Magnum = 10.1:1 (lowered to 9.7:1 in 1970)
440+6 = 10.5:1
426 Hemi = 10.25:1
Very true. They didnt run high compression for sure. I believe the 413-426 Max Wedge engines were running 11-1 cr. The 413 might have been 13-1 cr. But racing applications.

Last edited by RALLY; 08-21-2021 at 12:37 AM.
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Old 08-21-2021, 02:45 AM
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I’ve recently watched the YT documentary on Herb McCandless and he talks about shifting the 440 cars at 5000 RPM while other drivers were needlessly spinning them up to 6000. Guess who won Class? BTW, to anyone that hasn’t taken the time to watch the Herb McCandless doc, you are denying yourself of something awesome!
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Old 08-21-2021, 03:10 AM
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Quote:
Originally Posted by 1967Z28 View Post
I wonder what the Hemis were turning for revs in Nascar at sustained high speeds. It seems like a Superbird at 200mph would be turning more than 5,000 or 5,500 rpm but maybe not.
Nascar Hemis were like a single 4 BBL A990 Race Hemi. 12.5:1 CR and a solid cam. They would probably run between 7000 and 8000 RPM. Estimated HP would be around 750 to 800HP.

Last edited by Lee Stewart; 08-21-2021 at 03:12 AM.
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