Flat tappet lifter failure

Terry Cain · 07-26-2023, 08:23 PM

Curious how many have had this problem regardless of reasoning in last 5 years or so.

GTX JOHN · 07-27-2023, 01:18 AM

My boy has had issues that have cost engines while
running the expensive billet stuff.

Run to Rund · 07-27-2023, 09:34 AM

Spring pressure and lifter diameter are factors as well. Stock lifters are good at 380 lb. open and .921" diameter. 500-550 lb. open are another story.

Gmirza · 07-27-2023, 08:51 PM

I lost one cam lobe, I noticed it after about 100 runs. I’m not sure when it went away. Most likely caused by lack of oiling at low rpm. From what I’ve been told the tool steel lifter, cast cam combination is only good for maybe 200 runs if you’re lucky. Go fast stuff can be a P.I.T.A.

Paul Precht · 07-27-2023, 09:30 PM

Quote:

Originally Posted by Gmirza

I lost one cam lobe, I noticed it after about 100 runs. I’m not sure when it went away. Most likely caused by lack of oiling at low rpm. From what I’ve been told the tool steel lifter, cast cam combination is only good for maybe 200 runs if you’re lucky. Go fast stuff can a P.I.T.A.

Hi George, do you know what your spring pressures were open and closed.

Demon340 · 07-28-2023, 04:06 PM

Quote:

Originally Posted by Gmirza

I lost one cam lobe, I noticed it after about 100 runs. I’m not sure when it went away. Most likely caused by lack of oiling at low rpm. From what I’ve been told the tool steel lifter, cast cam combination is only good for maybe 200 runs if you’re lucky. Go fast stuff can a P.I.T.A.

Lost a Tool Steel lifter after 6 runs..

Gmirza · 07-28-2023, 07:46 PM

Quote:

Originally Posted by Paul Precht

Hi George, do you know what your spring pressures were open and closed.

Hi Paul,
I’m not sure. I didn’t check them.

Bench Racer · 07-29-2023, 12:25 PM

Terry you have a PM

Terry Cain · 10-05-2023, 08:11 AM

https://rehermorrison.com/tech-talk-...-flat-tappets/

Billy Nees · 10-05-2023, 09:09 AM

Quote:

Originally Posted by Terry Cain

https://rehermorrison.com/tech-talk-...-flat-tappets/

What's your point. If you want to use a roller cam then either run SS or build a newer Corvette Stocker!

07-26-2023, 08:23 PM	#1
Terry Cain Senior Member Join Date: Feb 2008 Location: Georgetown, Indiana (close to Louisville, KY) Posts: 773 Likes: 514 Liked 226 Times in 105 Posts	Flat tappet lifter failure Curious how many have had this problem regardless of reasoning in last 5 years or so. Attached Thumbnails __________________ Terry Cain ???? STK tcain19689585@gmail.com Last edited by Terry Cain; 07-27-2023 at 06:49 PM.

07-27-2023, 01:18 AM	#2
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,597 Likes: 2,376 Liked 2,127 Times in 612 Posts	Re: Flat tappet lifter failure My boy has had issues that have cost engines while running the expensive billet stuff. __________________ John Irving 741 Stock 741 Super Stock

07-27-2023, 09:34 AM	#3
Run to Rund Senior Member Join Date: Sep 2007 Location: Henderson, NV Posts: 578 Likes: 7 Liked 47 Times in 25 Posts	Re: Flat tappet lifter failure Spring pressure and lifter diameter are factors as well. Stock lifters are good at 380 lb. open and .921" diameter. 500-550 lb. open are another story.

07-27-2023, 08:51 PM	#4
Gmirza Member Join Date: Dec 2018 Location: Massachusetts Posts: 169 Likes: 189 Liked 245 Times in 90 Posts	Re: Flat tappet lifter failure I lost one cam lobe, I noticed it after about 100 runs. I’m not sure when it went away. Most likely caused by lack of oiling at low rpm. From what I’ve been told the tool steel lifter, cast cam combination is only good for maybe 200 runs if you’re lucky. Go fast stuff can be a P.I.T.A. __________________ George Mirza D/SA 1236 ‘71 Duster 340 Last edited by Gmirza; 07-28-2023 at 07:47 PM.

07-29-2023, 12:25 PM	#8
Bench Racer Member Join Date: May 2002 Location: Green Creek (Tryon) North Carolina Posts: 331 Likes: 69 Liked 99 Times in 21 Posts	Re: Flat tappet lifter failure Terry you have a PM

10-05-2023, 08:11 AM	#9
Terry Cain Senior Member Join Date: Feb 2008 Location: Georgetown, Indiana (close to Louisville, KY) Posts: 773 Likes: 514 Liked 226 Times in 105 Posts	Re: Flat tappet lifter failure https://rehermorrison.com/tech-talk-...-flat-tappets/ __________________ Terry Cain ???? STK tcain19689585@gmail.com