A 12 cars factory redline

[frankk]

What was the factory redline for the A 12 cars

[Lee Stewart]

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

[RALLY]

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.

[Lee Stewart]

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

[frankk]

Thanks guys.......surprised at the c/r

[1967Z28]

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.

[MarcDant]

Was a 273 commando a solid lifter 275 hp. Thanks

[RALLY]

Originally Posted by Lee Stewart

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.

[markjohnson]

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!

[Lee Stewart]

Originally Posted by 1967Z28

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.