RE: Pistons for 440 crossram wedge

David/Jason,

The Hyd. 284/.484” (241@.050”) 108LC is a tremendously powerful cam in my 340 Dart but as I remember Don Dulmage saying, “You can’t overcam a 440” they want long duration and high lift cams. I don’t think the cam alone is a detriment to performance but an integral part of the en entire “package.” Every component must work together to meet an expected outcome. If your expected outcome exceeds a selected “cam” or package requirement, then you will not meet your goal and be disappointed. That being said, it is imperative that your compression/head work/induction/chassis weight and gearing (included trans stall) all “work efficiently” in the RPM range you selected. Looking back at the build components of your Big Block is more challenging but consultation with your engine builder should provide answers; as well as getting your Mopar on the road to assess “how it runs” and if it meets your expectations.

Regarding the 284/.484” (241@.050”) 108 HYD. Purple Shaft...its specs “seemingly” appear too large for a warmed over small block 340 but when you factor the “package” of matched components, it works splendidly in my application;

3200lb. chassis weight w/o driver

Clutch Sure Grip 3.91 rear gear w/24” tall Drag Radials

Race prepped 904 w/low gear set & manual valve body

3500 stall 10” Continental Convertor

340 w/stock 10.5 to 1 pistons and 2.02/1.60’s with mild head work

1 5/8” Doug Thorley Headers through 2 1/2” exh. pipe & Dynomax Super Turbos

LD340 intake & 850cfm Thermoquad – haven’t “tuned” the TQ in 25yrs...just plain runs

Chassis Dyno numbers should really put you to sleep if you are “into numbers”...268 RWHP @ 5700RPM & 277 RWTorque @ 3200RPM...turns quarter in 12.8 @ over 106mph all day long through the muffs

and is a rocket ship on the street...just a fun reliable cruiser.

Therefore, if components are properly matched, your Big Block should really honk when called on.

Gary P.

From: Jason Rhoades

Sent: Monday, October 17, 2016 6:12 AM

To: 1962to1965mopars@xxxxxxxxxxxxxxxx

Subject: RE: Pistons for 440 crossram wedge

When you get that together I’d really like your opinion on how it runs privately is fine. I have been around 3 engines of varying states of performance. And I’m sorry to report not one time did the engine perform to my satisfaction. One guy just sold the car he was so disappointed. The other guy same specs. On the motor i.e. 10:1 compression and internal parts 906 heads same junk intake and all that. swapped cam to the Mopar 509 cam and then I was pleased with its performance. We had installed the 284-484 purple shaft based on reasoning that it’s a show car/ driver. 69 general lee clone. Thing was gutless and we installed a 3500 stall converter to help it out. yes that helped but still was dead feeling. Swapped to the bigger cam and suddenly the car has more tire frying performance and sounds way better. Another buddy had a 284 484 cam in one of his cars and it slowed down at the strip over a smaller cam they had. So personally speaking for all the hype the cam has I’ve never seen the performance from it. maybe just wrong combination I don’t know. that’s why I’m asking. Plus I’m about to yank the Engle cam in my 65 out and put something else in. sure it makes torque from the bottom to the top but it has no “bite” and I get terrible fuel mileage. My charge 440 with 2 4bbl carbs and 324 duration 550 lift hydraulic cam would get 10-12 mpg. And I didn’t baby that thing either. But the 65 I do drive sensibly.

Sorry for rambling but I would like to find the magic combination that will make that 284 cam work.

Jason

From: 1962to1965mopars@xxxxxxxxxxxxxxxx [mailto:1962to1965mopars@xxxxxxxxxxxxxxxx] On Behalf Of PallCon Services
Sent: Saturday, October 15, 2016 4:44 PM
To: 1962to1965mopars@xxxxxxxxxxxxxxxx
Subject: Re: Pistons for 440 crossram wedge

Thanks for info Guys

Jason below are cam specs I think but not 100 % sure.

I will check on the KB Hypereutectic pistons.

Hoping to run pump gas as well. Thanks Gary

I will post more pics when I pick up next week.

Cam and Lifters, Hydraulic Flat Tappet, Advertised Duration 284/284, Lift .484/.484, Chrysler, Big Block, Kit

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Mopar Performance Purple Camshaft

David

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