Re: Stock Cam replacement
[Re: psh]
#2322991
06/18/17 11:54 AM
06/18/17 11:54 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Dave Hughes has a good rep. & a cam for low compression would for sure have enough vac for PB, no worries there.
live every 24 hour block of time like it's your last day on earth
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Re: Stock Cam replacement
[Re: 451Mopar]
#2323539
06/19/17 11:56 AM
06/19/17 11:56 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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That is the Whiplash cam. It installs at 102 intake centerline (closes the intake early for good dynamic compression) and has a narrow lobe seperation angle which gives it alot of overlap (rough idle, low vacuum.) so one of those cams intended for low comp actually has low vac? I never would of guessed & I woulda thought just the opposite.
live every 24 hour block of time like it's your last day on earth
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Re: Stock Cam replacement
[Re: psh]
#2323603
06/19/17 02:03 PM
06/19/17 02:03 PM
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Joined: Jan 2003
Posts: 14,531 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,531
So. Burlington, Vt.
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so one of those cams intended for low comp actually has low vac? I never would of guessed & I woulda thought just the opposite. You're surprised a cam that specs out as 232/245-107(as per the Hughes site)would have low vacuum? I would absolutely expect low vac out of that cam...... Especially in a low cr motor. It's designed to idle rough...... Which is done by dirtying up the idle with lots of overlap.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Stock Cam replacement
[Re: psh]
#2323638
06/19/17 03:22 PM
06/19/17 03:22 PM
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Joined: Jan 2003
Posts: 14,531 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,531
So. Burlington, Vt.
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I didn't see it mentioned anywhere...... But if the "plan" is to retain the OE carb(TQ), intake, and exhaust manifolds, then IMO........ That really narrows down what I would feel are the "appropriate" cam choices.
And if that is how it's going to be run, then I def feel the big valves are a step in the wrong direction.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Stock Cam replacement
[Re: psh]
#2323639
06/19/17 03:24 PM
06/19/17 03:24 PM
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Joined: Jan 2003
Posts: 75,274 A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,274
A gulag near you.
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Still want to know what Worman would use LOL
and then avoid it at all costs ...
Mainstream Media is the new Pravda
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Re: Stock Cam replacement
[Re: fast68plymouth]
#2323755
06/19/17 06:59 PM
06/19/17 06:59 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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so one of those cams intended for low comp actually has low vac? I never would of guessed & I woulda thought just the opposite. You're surprised a cam that specs out as 232/245-107(as per the Hughes site)would have low vacuum? I would absolutely expect low vac out of that cam...... Especially in a low cr motor. It's designed to idle rough...... Which is done by dirtying up the idle with lots of overlap. Well I ain't a cam guy & I had assumed that a cam that is specifically designed to build/trap compression would have a good vac #. Obviously not & I learned something today.
live every 24 hour block of time like it's your last day on earth
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Re: Stock Cam replacement
[Re: psh]
#2324115
06/20/17 11:52 AM
06/20/17 11:52 AM
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Joined: Jan 2003
Posts: 75,274 A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,274
A gulag near you.
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psh you said the cam had flat lobes , safe to assume you are taking this engine further down ... like completely apart ... than just a bad choice head rebuild?
If you are stuck on stock iron junk then fast68plymouth is the person to see , it's only a 2.5 to 3 hour ride up to his shop.
Mainstream Media is the new Pravda
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Re: Stock Cam replacement
[Re: psh]
#2324618
06/21/17 11:38 AM
06/21/17 11:38 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I know some of you wont like this but I purchased the KC661 kit. Nah we're good with that! post how it acts when the time comes.
live every 24 hour block of time like it's your last day on earth
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Re: Stock Cam replacement
[Re: psh]
#2326168
06/24/17 05:59 PM
06/24/17 05:59 PM
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Joined: Dec 2005
Posts: 259 Scatchamatoon
Saskabusa
enthusiast
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enthusiast
Joined: Dec 2005
Posts: 259
Scatchamatoon
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Hello
New to Moparts
Could anyone suggest a replacement cam for a 1974 Roadrunner 400 "P" code motor? I don't want to change the factory rockers or pushrod length if I don't have to? I see Sealed power CS-661 or kit KC661 with lifters, or Yearone MP31, Comp Cams 21-212-4. Cannot seem to find the exact specs of the original. Heck, what would Worman use? Also anyone use the Sealed power rockers or arms (vintage)
Thanks I have the same car 35000 mile 74 Roadrunner with a 400/auto. My car is stock except for a 3" TTI exhaust and 3.91 gears. The no. 5 intake lobe went bad and I had to replace the cam. The cam that's free is right for me, so I wound up with a 274 comp. This is not a great selection, rough idle noticeably less low end torque. I'm not happy with it. I was going to make the same post, so this is what I need to know. I look forward to seeing how it works out for you.
Last edited by Saskabusa; 06/24/17 06:00 PM.
1974 Roadrunner
1967 Charger
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