Camshaft retainers - ZR-1 Net Registry Forums

04-02-2009

Some of you have followed along with the other thread about the damaged cam cover and the broken rear cam retainer. Initially it was thought to be the one just on the passenger side exhaust cam. After the deliberation of fixing just that one or tearing down the entire motor, we discovered that both rear retainers on intake and exhaust on the driver side were cracked as well. Although they were only cracked in one place.

After contacting GM with the number on the callout 10067713 (which sold the retainers in one set) none were to be found anywhere inside GM. A call to GM knowing there had to be two separate numbers provided us with the numbers 10067731 & 10106165. Both are discontinued with no stock at GM.

The next call was to make some phone calls to various LT5 guys. One has the parts but will not sell them separate from the cylinder head, even though he sold a set of heads minus the retainers a short while ago. The second guy said he had the parts and would back to me. After several follow up phone calls I got no response. Great!

The solution was to machine our own. Taking known good pieces they were spec'd out and created in CAD. The end result is a much better piece than the factory one. It is made out of billet alumimum and the thin stress points that cracked on Rob's motor have been increased in thickness.

These are not so much for replacement of your current ones, but for people who have damaged pieces or have bought a cylindner head with them.

Onto the images!

04-02-2009

Shots of where the rear retainer broke

LGAFF · 04-02-2009

Whats the $?

tomtom72 · 04-02-2009

Wow Jeff, nice design and manufacturing work!

Those are really great looking units!

GOLDCYLON · 04-02-2009

Nice work Jeff. Was the original cam able to be saved?

FU · 04-02-2009

The new CAD reatiners look quite a bit stronger than the stock cast retainers. You do nice work Jeff !

The camshaft hole looks like it will have to be line bored . Can that be done easily ?

Pete · 04-02-2009

Jeff

Pete

04-02-2009

Quote:

Originally Posted by FU2

The new CAD reatiners look quite a bit stronger than the stock cast retainers. You do nice work Jeff ! =D>
The camshaft hole looks like it will have to be line bored . Can that be done easily ?

Frank, there is no need to have them line bored. The retainers only touch the camshaft when the cam cover is off of the motor. The forward piece contains a thrust washer to locate the cam fore and aft.

04-02-2009

Quote:

Originally Posted by GOLDCYLON

Nice work Jeff. Was the original cam able to be saved?

We are not going to chance it and have opted to replace it. There was some material transfer from the original retainer onto the cam lobe.

04-02-2009

Quote:

Originally Posted by LGAFF

Whats the $?

Which ones do you need Lee?

04-02-2009	#1
Jeffvette Guest Posts: n/a	Camshaft retainers Some of you have followed along with the other thread about the damaged cam cover and the broken rear cam retainer. Initially it was thought to be the one just on the passenger side exhaust cam. After the deliberation of fixing just that one or tearing down the entire motor, we discovered that both rear retainers on intake and exhaust on the driver side were cracked as well. Although they were only cracked in one place. After contacting GM with the number on the callout 10067713 (which sold the retainers in one set) none were to be found anywhere inside GM. A call to GM knowing there had to be two separate numbers provided us with the numbers 10067731 & 10106165. Both are discontinued with no stock at GM. The next call was to make some phone calls to various LT5 guys. One has the parts but will not sell them separate from the cylinder head, even though he sold a set of heads minus the retainers a short while ago. The second guy said he had the parts and would back to me. After several follow up phone calls I got no response. Great! The solution was to machine our own. Taking known good pieces they were spec'd out and created in CAD. The end result is a much better piece than the factory one. It is made out of billet alumimum and the thin stress points that cracked on Rob's motor have been increased in thickness. These are not so much for replacement of your current ones, but for people who have damaged pieces or have bought a cylindner head with them. Onto the images!

04-02-2009	#2
Jeffvette Guest Posts: n/a	Re: Camshaft retainers Shots of where the rear retainer broke

04-02-2009	#3
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,191	Re: Camshaft retainers Whats the $? __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

04-02-2009	#4
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: Camshaft retainers Wow Jeff, nice design and manufacturing work! Those are really great looking units! __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

04-02-2009	#5
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,153	Re: Camshaft retainers Nice work Jeff. Was the original cam able to be saved? __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V

04-02-2009	#6
FU Join Date: Mar 2004 Location: Found Member Posts: 4,346	Re: Camshaft retainers The new CAD reatiners look quite a bit stronger than the stock cast retainers. You do nice work Jeff ! The camshaft hole looks like it will have to be line bored . Can that be done easily ? __________________ Frank Urbo. NCM Lifetime member # 982 Registry Founding # 237

04-02-2009	#7
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,680	Re: Camshaft retainers Jeff Pete __________________ '91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage