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Rocker arm shafts and aluminum heads #967349 04/05/11 10:56 PM 04/05/11 10:56 PM
Joined: Mar 2005 Posts: 940 Metro Detroit 1 1970RT OP super stock
1970RT OP super stock 1 Joined: Mar 2005 Posts: 940 Metro Detroit	When switching over to aluminum heads (Edelbrock Performer), do the rocker arm shafts have to be replaced or can the stock iron head shafts be used? Also, do roller rockers require a different shaft?

Re: Rocker arm shafts and aluminum heads [Re: 1970RT] #967350 04/05/11 11:08 PM 04/05/11 11:08 PM
Joined: Jan 2003 Posts: 4,616 Kissimmee Fl. D dusturbd340W5 master
dusturbd340W5 master D Joined: Jan 2003 Posts: 4,616 Kissimmee Fl.	1 yes you can use stock rocker gear 2 depends on what roller rockers they are 70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4

Re: Rocker arm shafts and aluminum heads [Re: dusturbd340W5] #967351 04/05/11 11:14 PM 04/05/11 11:14 PM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	As a guide the aluminum heads don't care what the shafts are as long as OD is correct but the rockers do care. Match the shafts and rockers to each other. Stock shafts and stock rockers are fine. Roller bearing rockers normally need harder/thicker wall shafts. Getting both matched by the same knowledgable vendor is best.

Re: Rocker arm shafts and aluminum heads [Re: dusturbd340W5] #967352 04/05/11 11:17 PM 04/05/11 11:17 PM
Joined: Oct 2005 Posts: 8,926 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,926 Ontario, Canada	Yes, they can be used BUT why would you want to, they're JUNK. Do yourself a REALLY big favor and splurge on a set of decent aftermarket shafts. If you use a roller rocker with a bearing on the shaft (like Harlan Sharps) then you ABSOLUTELY need hard chromed shafts. For any rocker that is either iron, aluminum or bronze bushed then a standard aftermarket shaft will suffice.

Re: Rocker arm shafts and aluminum heads [Re: Stanton] #967353 04/06/11 01:13 PM 04/06/11 01:13 PM
Joined: Aug 2005 Posts: 4,799 ILL M MLR426 master
MLR426 master M Joined: Aug 2005 Posts: 4,799 ILL	Yes you need a good set of aftermarket shafts as Stanton says. Hughes has a nice set of shafts that has the extra banana shaped oiling chamfering slots next to the oiling holes and hard chromed. logan426

Re: Rocker arm shafts and aluminum heads [Re: Stanton] #967354 04/06/11 01:49 PM 04/06/11 01:49 PM
Joined: Jan 2003 Posts: 4,767 Moved to N.E. Tennessee GomangoCuda master
GomangoCuda master Joined: Jan 2003 Posts: 4,767 Moved to N.E. Tennessee	Quote: If you use a roller rocker with a bearing on the shaft (like Harlan Sharps) then you ABSOLUTELY need hard chromed shafts. For any rocker that is either iron, aluminum or bronze bushed then a standard aftermarket shaft will suffice. Trust me, you do not want to put needlebearing rockers on chromed shafts. The needlebearings fracture the chrome and then you can guess the rest. Use hardened shafts with needlebearing rockers. You can use chrome shafts with smooth bore rockers with or without bushings. In theory, there is no difference between theory and practice. In practice, there is.

Re: Rocker arm shafts and aluminum heads [Re: GomangoCuda] #967355 04/06/11 05:54 PM 04/06/11 05:54 PM
Joined: Oct 2005 Posts: 8,926 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,926 Ontario, Canada	Quote: Trust me, you do not want to put needlebearing rockers on chromed shafts. Seems strange that the Harlan Sharp shafts are hard chromed then !!!

Re: Rocker arm shafts and aluminum heads [Re: Stanton] #967356 04/06/11 06:25 PM 04/06/11 06:25 PM
Joined: Jan 2003 Posts: 4,767 Moved to N.E. Tennessee GomangoCuda master
GomangoCuda master Joined: Jan 2003 Posts: 4,767 Moved to N.E. Tennessee	Quote: Quote: Trust me, you do not want to put needlebearing rockers on chromed shafts. Seems strange that the Harlan Sharp shafts are hard chromed then !!! Their website says "specially heat treated, heavy wall, rocker shafts." No mension of hard chrome. http://www.harlandsharp.com/bb_mopar.htm Here is what Dvorak says about shafts for H.S. rockers http://www.dvorakmachine.com/rockershafts.shtml Racerbrown, T&D and Jessel don't use chromed shafts either with their needlebearing trunion rockers. Last edited by GomangoCuda; 04/06/11 07:08 PM. In theory, there is no difference between theory and practice. In practice, there is.

Re: Rocker arm shafts and aluminum heads [Re: 1970RT] #967357 04/06/11 07:18 PM 04/06/11 07:18 PM
Joined: Jul 2005 Posts: 757 Toronto, Ont, Canada boydsdodge super stock
boydsdodge super stock Joined: Jul 2005 Posts: 757 Toronto, Ont, Canada	Don't forget to set up your valve to rocker geometry. Also you my need new hold down bolts, and push rods. I have had to raise and lower the shafts on Edelbrocks on different builds to get the rockers centered. P.S. They are not bolt on. Last edited by boydsdodge; 04/06/11 07:19 PM.

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