In my experience with others an uninformed and poorly researched CAM change will ruin your fun with your car. Many believe that a rumpy idle is sexy and a sign of virility and power. Instead it’s a poor idle caused by valve operation overlap and a side deficiency of a racing motor deigned for high RPM output. I begged a close friend not to do this on a 59 Dodge D-500. He wanted lump. He received a stone. The car smelled bad and couldn’t climb a hill. The CAM was all wrong. He changed it begrudgingly but the car woke up. Don Verity and I both know another fella who did similarly and ended up with a high idling car that stalls and will not run right. I realize I’m preaching mostly to the choir here but still, CAM design was a very careful and deliberate process undertaken by very pointy headed engineers using a myriad of variables and consideration. And some still think “hey, gimmie that rumpidy-rump cam in that box there, the one that says “extra lumpy.” Big heavy cars like ours do not benefit from high lift high duration CAM shafts unless the rest of the engine and the use of the car are altered to benefit from it. How many of us as kids put big carbs on our beaters and wondered why they ran worse? Danny Plotkin From: chrysler-300-club-international@xxxxxxxxxxxxxxxx [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx] On Behalf Of Gary Gettleman
Sent: Monday, May 9, 2022 12:21 AM
To: John R. Cote <cotejohnr@xxxxxxx>
Cc: Gary <garythepartsdoc@xxxxxxxxxxxx>; Ray Melton <rfmelton@xxxxxxx>; Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} Need more fuel! John C, OK Mister Smarty, where the h#*l were you when I started down this rabbit hole?!! John all kidding aside, you are spot on with your very terse comment. After all the responses from you and the rest of Great Folks in 300 land, putting the C back to stock with closest I can get to the factory spec'd cam. As Paul Harvey ( most likely you are way too young to remember) would say "And now the rest of the story," will follow up with "The Rest of the Story" once we do the swap out. Just a question........... Why change a cam from original to a problem? Am I missing something? -----Original Message-----
From: Gary Gettleman <gary.gettleman@xxxxxxxxx>
To: Gary <garythepartsdoc@xxxxxxxxxxxx>
Cc: Ray Melton <rfmelton@xxxxxxx>; 300 Club <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Sent: Sat, May 7, 2022 7:19 pm
Subject: Re: {Chrysler 300} Need more fuel! Gary, The more information I get the more confused I become. Leaning towards replacing the isky cam that hot heads recommend and going with Clay Smith cam that Rob Kern likes. Have low vacuum between 6-8 lbs and that's after idle was bumped up. With a No. and letter drill set you can dill jet to any size you need. Sent: Saturday, May 07, 2022 12:25 PM Subject: Re: {Chrysler 300} Need more fuel! Ray, Thank you for your way over my pay grade response. Mechanic is very talented and has some very high $$$$ builds to his credit. That said, his main business is high end Resto Mods. Did a buddies '41 Cad coupe on Art Morrison frame with 2021 Cadillac Hot Engine and 8/10 ? speed tranny. Very High end builds, yet he will work on old Detroit iron like our beloved 300's. I like your suggestion re the service bulletin update and will start there and let you know how it goes. The once "Golden State" (but not so much any more) of California. Sounds like it could be insufficient accelerator pump shot. Which jets is he suggesting to be changed, and to what size? How did your mechanic decide which jets to change and the new size - anything scientific or just WAG? How will you find those jets for such an obsolete carburetor? Even if jets for the later Carter AFB would fit, is the internal fuel/air flow circuitry the same as for the WCFB? Since the 300C was originally intended to run on only one carburetor at low RPM, you may have upset the A/F ratio right off idle when you converted to synchronous (non-progressive) carburetor function - going too lean because of the unintended extra airflow from the other carburetor. Have you incorporated the carburetor modifications recommended by Chrysler in Technical Bulletin #364 of July 16, 1957? That may/may not help, but it couldn't hurt. I had Jim McGowan do that mod when he restored my carburetors - excellent workmanship and results! Depending on the elevation where you primarily operate, you might also want to consider different metering rods, too, although that will not affect your off-idle stumbling issue. Ray Melton 300C in New Mexico ********************************************************************** On 5/7/2022 12:31 PM, Gary Gettleman wrote: To All the Great Folks in 300 Land. Apparently the cam that we installed during the C engine rebuild is a bit lumpy as compared to the stock cam. Have what I would call a momentary stutter when the right foot presses down. We adjusted carb linkage so instead of running on 2 barrels it's now on 4, which has improved performance, but still get the occasional hiccup. Mechanic said we need to swap out the jets for larger size and that will solve problem. Figure someone else has had this problem and would appreciate your help with this issue. --
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