Re[2]: {Chrysler 300} 300F Engine Dyno Results

As far as I know we do not have documentation from Chrysler on the true output of the standard F and G engines. But we do have the document related to the J engine which Chrysler dyno'd in Aug. 1962 - I think it might be on the club website somewhere. We know for a fact that the J (and Ram K which was the same) made at LEAST 25 more hp than F/G - and that was straight from the expert - the late Burt Bouwkamp. It made more power due to short rams, solid cam, and headers. Chrysler tested the true NET hp of the J engine (with full stock exhaust system) and it peaked at about 315 to 320hp. That means gross hp would have been at LEAST the advertised 390hp and maybe more. BTW, consider how remarkable that was in 1963-63 - not counting the max wedge and 426 hemi - it was wasn't until the 6 pack 440 came out that you had a 440 that made 390hp!

What factors do they address to get from old gross numbers to today's net numbers? I seem to recall that the old gross numbers were obtained without running ancillaries like a generator/alternator, power steering pump, A/C, etc., but what else? I believe from his wording that Mr Grossi sent just the engine itself to the dyno, so there should be no drivechain losses.   And it looks like only the horsepower number was significantly different than the old measurement, but the torque number was close to the same. That doesn't make sense to me - (YET)! I don't know if the peak torque and HP numbers occurred at about the same RPM as original, but assuming that they are, how else can that difference be explained?

Ray Melton      300C cvt in Las Cruces, NM

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On 1/11/2024 2:43 PM, dplotkin wrote:

The original ratings were gross. Today's ratings are net.

Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------

From: Frederick Grossi <e55grossi@xxxxxxxxx>

Date: 1/11/24 12:53 PM (GMT-05:00)

To: chrysler-300-club-international@xxxxxxxxxxxxxxxx

Subject: {Chrysler 300} 300F Engine Dyno Results

Hello Group,

The rebuild on my 300F engine has been completed and the engine rebuilder sent it to the dyno for break-in, running condition and leak detection.
The engine is stock, stock carburetors and ram intake manifold, stock bore (it was sleeved because of pitting on a couple of the cylinder walls), as stock a cam as you can get, same crankshaft and pistons. The engine was rebuilt by someone else in 1995 before I owned the car. The engine was bored .004 at that time.
My rebuilder wanted to share the results with our group to see if anyone else had similar experiences:

Maximum engine torque - 2,900 rpm- 496 ft. lbs.
Maximum horsepower -     4,600 rpm - 316 hp

The horsepower is about 16% lower than factory specifications of 375hp.
Has anybody else had this differential in hp from factory? Is this normal?

Thank you,
Fred Grossi
Pegram, TN

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