3917291 Heads - Team Camaro Tech
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post #1 of 3 (permalink) Old Sep 5th, 16, 04:55 PM Thread Starter
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Pete
 
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3917291 Heads

I have a pair of 3917291 2.02/1.60 original GM heads. One is dated C/22/8
and came of a 68 z/28 302. The other one is dated I/13/8 and came from a 327 HO motor. They have been sitting around for quite some time and I just recently removed the rockers along with the rocker ball and nut and put them in a cleaning solution. I didn't pay much attention to what I was doing because both heads used 1.5 rockers, however the z/28 head had 'O' rockers and the other head just regular rockers. As I was cleaning the parts I noticed that I had 8 rocker balls of one thickness and 8 of another thickness. I don't think it makes much of a difference but when I put them back on the heads, I would like to put the correct 'balls' with the corresponding rockers. Do the thinner rockers go with the 'O' rockers or the regular rockers or visa versa.

Pete
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post #2 of 3 (permalink) Old Sep 5th, 16, 06:56 PM
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Don
 
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Re: 3917291 Heads

Not supposed to mix rocker arm and pivot balls , after they have been burned in. Its a pattern thing.
Need to pair them for he next user.

Don
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #3 of 3 (permalink) Old Sep 6th, 16, 11:22 AM
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Will
 
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Re: 3917291 Heads

Pete: Too late now to worry about trying to figure out which rocker arm went with which pivot ball. Don is 100% correct about the balls and rockers wearing in together. If you want to stay with the factory configuration order a new set of rockers and balls. If you by chance have screw in vs. pressed in rocker arm studs go the extra mile and go with a good set of roller rockers. Much more efficient as the motion is supported by needle bearings vs. stock rockers sliding metal to metal sections. As an added benefit you will pick up a few horsepower with a switch to roller rockers. Best of luck.

Detective Lt. Will, Chief of Homicide/ Chief Deputy Coroner: RETIRED AFTER 32 years.
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67 Camaro RS /327 -275 hp
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