No More Big Block Cam Problems - Team Camaro Tech
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post #1 of 9 (permalink) Old Apr 16th, 08, 05:19 AM Thread Starter
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Russel
 
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No More Big Block Cam Problems

I have been into performance stuff since 1986 when I was 16 and built my first engine a pontiac 455. I look into things pretty close before I just slap stuff together. In the past couple of years I have been seeing alot of big block chevys with wiped out cam lobes. It seems like the fix is to buy a roller cam. To me thats not a fix at all. I dont want a solid roller that you have to rev up at the stop lights to keep enough oil on it, and a hydrolic roller in a big block wont turn past 6500. So I took a different route. I had my block put on a cnc machine and bushed the lifter bores. My block had 2 lifter bores that were perfect, and the other 14 were off. I got the block back and called every cam manufacture that I could until I talked to ERSON. They grind flat tappet cams on a .003 angle on the lobe. To keep the lifter spinning. That is the highest spec they can go. I run a .637 lift cam, and with a short amount time on the engine I pulled the intake and checked the lifters. They dont have a mark on them, and the side wear around the lifter is perfect. The machine work cost me $550. Well worth it and the flat tappet wont fall apart like a roller lifter can.
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post #2 of 9 (permalink) Old Apr 16th, 08, 11:27 AM
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John
 
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Re: No More Big Block Cam Problems

I thought all f.t. cam makers had to grind a little angle to do that. They don't anymore? Hmmm.

BTW, I loved the Erson cam I had in a 350 years ago.

- John
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'67 V8 Camaro - 12637, 797-Z (Parchment), M-M (Royal Plum), 2M, 3K, 5Y
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post #3 of 9 (permalink) Old Apr 16th, 08, 11:37 AM
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AJ
 
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Re: No More Big Block Cam Problems

I don't see how a hydro roller would be limited to 6,500, if anything the roller moves the rpm pump up way up.
Pretty sure my flat tappet has revved to 7,200 with no pump up or float...

The only Mustang I'd ever own is a Fender.

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post #4 of 9 (permalink) Old Apr 16th, 08, 05:36 PM Thread Starter
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Russel
 
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Re: No More Big Block Cam Problems

The industry standard for cam companys is .0015, and all Im saying ERSON goes to the limit. I run a 2.300 intake valve so a hydrolic roller is out of question for me.
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post #5 of 9 (permalink) Old Apr 16th, 08, 06:59 PM
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Ron
 
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Re: No More Big Block Cam Problems

I've ran a Sigerson Solid FT F296-1 258/264 @ .050" .563" Lift in my all forged 11:1 68 327ci / Holley 750Dp / Edlebrock RPM / Fuelie Hds w/Manley 2.02-1.6 Ultra Lites / Shaft Roller Rockers and man that thing screamed. It's been on the self for 20 years now as I've been running BBC but one of these days it's going back in my Z. After 20,000 miles the cam lobes look perfect.

Russel you are right about Lifter Bore accuracy, it's a hit and miss situation some blocks are worse then others. GM did not pay much attention here and it accounts for the Forward Cam Walk on their FT designed engines when Roller Retro fitted. Because of this load on the Roller Pins, I will still use a Hi-ZDDP Oil. Of course the solution is to have the lifter bores machined true and doing so you can run a larger dia lifter which if fact does get the valve off the seat sooner then the .842" Solid FT lifter.

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Last edited by Z15CAM; Apr 16th, 08 at 11:07 PM.
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post #6 of 9 (permalink) Old Apr 16th, 08, 08:16 PM Thread Starter
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Russel
 
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Re: No More Big Block Cam Problems

Hey Ron I like the way you think. Im not up on that oil your talking about Im sure Its good stuff , I run Brad Penn straight 30 wt on break in. I like .0027 or more for bearing clearance, never any tighter.
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post #7 of 9 (permalink) Old Apr 16th, 08, 08:31 PM
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Ron
 
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Re: No More Big Block Cam Problems

Russel:

ZDDP is the Zinc and Phosphorous Content of Oil related to Shear Protection between Metal to Metal contact and critical to FT engines. New Energy Conserving API SL SM STD's have almost done away with it to protect the Catalytic converter at the expense of our FT Engines. The Old API SG SF API STD's have the Higher ZDDP formula but hard to find on the shelf today. Bradpenn Racing Oils is the old Kendall "The Green Oil" with plenty ZDDP but has to be ordered from a Distributer. 4 Stroke Motorcycle or Marine Oils API SG are still available in the Motorcycle or Marine dept's. Although I'm not a Castrol fan I run their 4 Stroke Motorcycle 20w 50 Oil in my BBC with Mechanical Roller/Crower HIPPO Roller Lifters as effort to Shear Protect the Roller Pins from Forces associated with Lifter Bore Alignment and Cam Walk. Many members here will add a ZDDP supplement such as ZDDP Plus or GM EOS FT Cam break in additive to Oil to increase the Zinc percentage but I feel more secure with an Oil Mfgr's formula if it is available.

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Last edited by Z15CAM; Apr 17th, 08 at 02:32 AM.
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post #8 of 9 (permalink) Old Apr 17th, 08, 06:23 PM
 
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Re: No More Big Block Cam Problems

Is there a accurate way of checking the lifter bores in the car ?
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post #9 of 9 (permalink) Old Apr 17th, 08, 07:45 PM Thread Starter
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Russel
 
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Re: No More Big Block Cam Problems

If you take a degree wheel and check all your valves they should all come out the same. Thats the cheep way to tell but not the best. Take it to a machine shop that has right equipment and cnc program to do the job. They set the machine up off the centerline of the cam and go from there. I took mine to guy with the best reputation and he gave me a cash out the door price of $550. I also talk to a shop closer to home that wanted a $1000. I guess its all in what you want to end up with. Dart blocks are darn good to start with and are more or less a lifetime investment. For $2500.
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