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Re: Cam/Lifter Failures [Re: CYACOP] #3266755
10/27/24 09:06 PM
10/27/24 09:06 PM
Joined: May 2003
Posts: 6,637
Downtown Roebuck Ont
Twostick Offline
Still wishing...
Twostick  Offline
Still wishing...

Joined: May 2003
Posts: 6,637
Downtown Roebuck Ont
Originally Posted by CYACOP
Originally Posted by B1MAXX
Are these stock heads? they are 1.85 installed. Those springs are too stiff at that height.

Stock heads yes. I agree with you but that was what they recommended.


Check the pressure of those springs to verify they match the spec for that part number. Just because it says 911 on the box, doesn't guarantee the spring in the box is 911.

As my late machinist used to say, "if it comes out of a box, it's fk'd up".

Kevin

Re: Cam/Lifter Failures [Re: Cab_Burge] #3266780
10/27/24 10:19 PM
10/27/24 10:19 PM
Joined: Oct 2005
Posts: 5,019
WI
Dcuda69 Offline
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Posts: 5,019
WI
Originally Posted by Cab_Burge
Save yourself some money and future frustration by converting to a roller cam and lifters now up twocents work


I agree! They're not without their own issues but in today's market it's the thing to do. 10 yrs ago I built a 470" solid flat tappet with Comp stuff. Lost the cam in 800 miles(yes...I did all the break in bs with the correct oil, etc. Not my 1st engine build by any means) I bit the bullet and switched to a solid roller( all Comp stuff) and have been cruising for the last 10 years. It's due for springs but it's a switch I'll never regret.......it runs WAY better with the roller(specs were very similar) and I no longer worry about flat tappet cam syndrome. twocents

Re: Cam/Lifter Failures [Re: Dcuda69] #3266800
10/28/24 06:03 AM
10/28/24 06:03 AM
Joined: Feb 2005
Posts: 3,970
SW Fla.
CYACOP Offline OP
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CYACOP  Offline OP
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Posts: 3,970
SW Fla.
I am just trying to build a decent running street car that will never see the track. If you guys have any recommendations on a reliable hydraulic roller setup let me know.
I am going to go ahead and start cleaning out all the metal shavings and order all of the lower end parts I need to get the bottom end assembly process going and research my options for the valve train.
Thanks for all your help.

Re: Cam/Lifter Failures [Re: CYACOP] #3266811
10/28/24 08:08 AM
10/28/24 08:08 AM
Joined: May 2005
Posts: 2,093
Apollo, PA.
B1MAXX Online content
top fuel
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Posts: 2,093
Apollo, PA.
Why not use the purple shaft with the correct springs.and save yourself 1500 bucks.

You lost the cam due to the springs used.

Re: Cam/Lifter Failures [Re: B1MAXX] #3266927
10/28/24 06:26 PM
10/28/24 06:26 PM
Joined: Feb 2005
Posts: 3,970
SW Fla.
CYACOP Offline OP
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CYACOP  Offline OP
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SW Fla.
Originally Posted by B1MAXX
Why not use the purple shaft with the correct springs.and save yourself 1500 bucks.



You lost the cam due to the springs used.

I think so too.

Re: Cam/Lifter Failures [Re: B1MAXX] #3267017
10/29/24 08:35 AM
10/29/24 08:35 AM
Joined: Jan 2003
Posts: 13,523
Marion, South Carolina [><]
an8sec70cuda Online content
I Live Here
an8sec70cuda  Online Content
I Live Here

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Posts: 13,523
Marion, South Carolina [><]
Not trying to argue, just stating my experience...I've built 3 BB Mopars in the past few years using hyd. flat tappet cams. All using the Comp 911 springs on stock heads w/ 1.88" installed height. All have been fine.
One was an old MP 509/292 cam.
One was a custom nitrided grind from Dwayne Porter.
One was the Summit 6401 cam.

I don't know what the answer is to a lot of these cam and lifter failures. I've seen them fail when everything was done "right".


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 4 speed, Dana 60
'71 Demon 340, no drivetrain, on blocks behind the barn
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
Re: Cam/Lifter Failures [Re: CYACOP] #3267025
10/29/24 09:02 AM
10/29/24 09:02 AM
Joined: May 2005
Posts: 2,093
Apollo, PA.
B1MAXX Online content
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B1MAXX  Online Content
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Joined: May 2005
Posts: 2,093
Apollo, PA.
A street performance hyd. flat tappet should be 100-110 seat 280-290 over the nose.

Re: Cam/Lifter Failures [Re: CYACOP] #3267099
10/29/24 04:31 PM
10/29/24 04:31 PM
Joined: Dec 2004
Posts: 10,627
Rittman Ohio
fourgearsavoy Offline
I Live Here
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Posts: 10,627
Rittman Ohio
My last solid flat cam was a Howards nitrided of the shelf cam with EDM lifters. I switched to a smaller solid roller from Isky and sold the flat cam to another member here It is still in use as far as I know in another big block. I only use Gibbs Driven BR series oil.

Gus beer


64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
Re: Cam/Lifter Failures [Re: fourgearsavoy] #3267206
10/30/24 10:59 AM
10/30/24 10:59 AM
Joined: Sep 2003
Posts: 20,440
north of coder
moparx Offline
"Butt Crack Bob"
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Posts: 20,440
north of coder
back in the day these cars were new, we swapped cams and lifters all the time, never paying too much attention to what lifter went where, or even if the lifters used belonged to the cam being swapped.
never seemed to have any problems with wiped lobes, but maybe the material of the components were better, or we were just "luckier than a cat scratchin' turds"........[as my old man used to say] who knows ? shruggy
beer

Re: Cam/Lifter Failures [Re: moparx] #3267215
10/30/24 11:42 AM
10/30/24 11:42 AM
Joined: Jan 2004
Posts: 4,652
Motor City
6
6PKRTSE Offline
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Posts: 4,652
Motor City
It's a combination of today's materials being used and today's spec low zinc oils that causes the issues with f.t. cams and lifters. The last several f.t. cams engines that I have built I always break in with the outer springs only. After break in, I add the inner/damper springs. Never any issues thus far. One engine has 54,000 miles on it and another six pack engine in my car has over 65,000 on it. Paying for the extra nitride process on the cam helps also.


1963 Belvedere 440 Max Wedge Tribute
1970 Charger R/T S.E. 440 Six Pack
1970 Challenger R/T, 528 Hemi
1970 Charger 500 S.E. 440 4 BBL
1970 Plymouth Road Runner 383
1974 Chrysler New Yorker 440
1996 2500 RAM 488 V-10 4X4
2004 3500 Dually Cummins 4x4
2012 Challenger R/T Classic.
Re: Cam/Lifter Failures [Re: 6PKRTSE] #3267223
10/30/24 12:10 PM
10/30/24 12:10 PM
Joined: Jan 2003
Posts: 21,395
Eagle, Idaho
Neil Online content
The Doctor is in.
Neil  Online Content
The Doctor is in.

Joined: Jan 2003
Posts: 21,395
Eagle, Idaho
GM engineers thoughts on the zinc in the oil thing.

https://www.nonlintec.com/sprite/oil_myths.pdf

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