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Motor won't rev over 4,000 rpm. Valve springs? #1343224 11/30/12 12:04 AM 11/30/12 12:04 AM
Joined: Feb 2007 Posts: 649 Davis, California, USA MrBelvedere2 OP mopar
MrBelvedere2 OP mopar Joined: Feb 2007 Posts: 649 Davis, California, USA	Hey guys, I got my 383 engine running really nice, just seems to drop off at 4,000 rpm. The tach will not go over 4,000 rpm no matter what I try to do to it. Brand new holley carb custom built for the motor as well. My question is, it has a crane cam hi intensity hydraulic 226 duration. cam card says max lift at 109 ATDC, 119 BTDC. Loads are 95 lbs closed, 244 lbs open. I have been trying to figure out what it could be. In my research it seems to point to valve springs. I am not sure if they are matched for the cam when the motor was built. The receipt I have for the motor is just "HP Springs". I am wondering fit this cam needs more than just HP spec springs? I can't find the part number for it which is 644321. It is an old cam so they probably don't make it anymore. What do you guys think? 1965 Plymouth Belvedere II hardtop

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Subject	Posted By	Posted
Motor won't rev over 4,000 rpm. Valve springs?	MrBelvedere2	11/30/12 04:04 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	bonefish	11/30/12 04:21 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	440PURSUIT	11/30/12 04:26 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	67Satty	11/30/12 04:30 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	6PakBee	11/30/12 04:35 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	Dunnuck Racing	11/30/12 05:19 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	Exit1965	11/30/12 05:31 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	Kern Dog	11/30/12 05:56 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	RapidRobert	11/30/12 06:02 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	Kern Dog	11/30/12 06:07 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	MrBelvedere2	11/30/12 06:57 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	That AMC Guy	11/30/12 08:06 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	Cab_Burge	11/30/12 04:27 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	68KillerBee	11/30/12 11:25 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	cjs69mope	11/30/12 03:19 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	Firepowerflyer	11/30/12 04:12 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	70Cuda383	11/30/12 04:41 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	autoxcuda	11/30/12 08:24 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	sixpack4spd	11/30/12 09:37 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	52savoy	12/01/12 01:59 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	IMGTX	12/01/12 03:47 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	52savoy	12/01/12 09:24 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	Dodgem	11/30/12 07:36 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	DusterMan	12/01/12 04:48 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	Dodgem	12/01/12 07:30 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	jbc426	12/01/12 07:39 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	HYPER8oSoNic	12/01/12 11:38 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	p d'ro	12/02/12 02:44 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	bogusracer	12/02/12 07:04 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	stumpy	12/02/12 08:15 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	MrBelvedere2	12/05/12 06:23 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	Kern Dog	12/05/12 06:58 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	Mr. T	12/05/12 08:07 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	autoxcuda	12/05/12 08:48 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	autoxcuda	12/05/12 08:53 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	Dodgem	12/05/12 02:49 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	MrBelvedere2	12/07/12 02:48 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	Kern Dog	12/07/12 02:52 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	Dodgem	12/07/12 03:00 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	cudaboy	12/07/12 10:28 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	fastnos	12/23/12 04:09 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	BigBlockMopar	12/23/12 04:28 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	MrBelvedere2	01/20/13 03:01 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	RapidRobert	01/20/13 03:37 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	buildanother	01/20/13 04:55 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	MoparforLife	01/20/13 11:05 AM
Re: Motor won't rev over 4,000 rpm. Valve springs?	drew72	01/20/13 07:22 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	MrBelvedere2	01/22/13 07:24 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	MoparforLife	01/22/13 07:37 PM
Re: Motor won't rev over 4,000 rpm. Valve springs?	70Cuda383	01/20/13 06:12 PM

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