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Post  AL Q on November 25th 2013, 11:20 pm

Harland sharp lists a different part # for scj heads. I'm wondering what the difference is ?
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Post  rmcomprandy on November 26th 2013, 11:29 am

AL Q wrote:Harland sharp lists a different part # for scj heads. I'm wondering what the difference is ?
Length of the lever arm from the stud hole and angle of the pushrod cup.

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Post  AL Q on November 26th 2013, 11:36 am

Will the different lever arm affect the lift of the valve?
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Post  rmcomprandy on November 26th 2013, 11:56 am

AL Q wrote:Will the different lever arm affect the lift of the valve?
NO ... unless you want more than a 1.73/1 ratio will provide. The SCJ heads NEED these, (or Crane geometry), rocker arms on the intake side; especially with big diameter springs. The exhaust side is not a problem with either rocker.

Personally, I buy both sets and split them. I use the S4073 on one side and the S4005 on the other side of all the Big block Ford heads..

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Post  AL Q on November 26th 2013, 11:59 am

Exactly the info I was looking for, thank you Randy
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