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Re: Block notching a Hemi for a roller cam
[Re: Paul_B]
#488128
10/04/09 04:14 PM
10/04/09 04:14 PM
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Joined: Jul 2005
Posts: 1,247
Fremont, CA.
Topcat
OP
pro stock
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OP
pro stock
Joined: Jul 2005
Posts: 1,247
Fremont, CA.
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Quote:
Solid roller or hydraulic roller? The grinding required for the hydraulic roller cam in a hemi isn't for the faint of heart...
I and another member are both interested in doing a solid roller cam. Mine a 472, his a 572.
I'm starting to think now it might be pretty expensive to do it. So I would like to know any details if possible.
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Re: Block notching a Hemi for a roller cam
[Re: Stanton]
#488130
10/04/09 04:16 PM
10/04/09 04:16 PM
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Joined: Jul 2005
Posts: 1,247
Fremont, CA.
Topcat
OP
pro stock
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OP
pro stock
Joined: Jul 2005
Posts: 1,247
Fremont, CA.
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Quote:
Depends on the amount of lift and the rocker ratio. A lot of lift moves the pushrod closer to the block as the valve approaches its maximium lift. Likewise, a rocker ratio is changed by moving the pushrod (adjusting screw) closer to the rocker shaft - thus moving the pushrod closer to the block.
Is there a basic rule of thumb that if going over so much lift .___? then notching is required?
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Re: Block notching a Hemi for a roller cam
[Re: Topcat]
#488131
10/06/09 07:36 PM
10/06/09 07:36 PM
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Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
torkrules
I'm neurotic
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I'm neurotic
Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
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Quote:
Quote:
Depends on the amount of lift and the rocker ratio. A lot of lift moves the pushrod closer to the block as the valve approaches its maximium lift. Likewise, a rocker ratio is changed by moving the pushrod (adjusting screw) closer to the rocker shaft - thus moving the pushrod closer to the block.
Is there a basic rule of thumb that if going over so much lift .___? then notching is required?
You will also need to open the holes up in the heads as well. You will also have to do some relieving in the head gaskets or Cometic have gaskets without holes.
If you are using a mega block, depending on the lifters, you may need to relieve the lifter bosses to clear the link bar.
The 440 does not have this problem as the push rods are straight and their are no push rod holes in the block or head.
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Re: Block notching a Hemi for a roller cam
[Re: Topcat]
#488132
10/06/09 08:54 PM
10/06/09 08:54 PM
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Joined: Nov 2003
Posts: 2,503
Illinois
CRE2004
super gas
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super gas
Joined: Nov 2003
Posts: 2,503
Illinois
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Quote:
Quote:
Solid roller or hydraulic roller? The grinding required for the hydraulic roller cam in a hemi isn't for the faint of heart...
I and another member are both interested in doing a solid roller cam. Mine a 472, his a 572.
I'm starting to think now it might be pretty expensive to do it. So I would like to know any details if possible.
If it was extensive grinding, it was most likely a hydraulic roller. They require a lot of pushrod clearancing. Most street/bracket solid rollers go in with little to no grinding depending on the combination of parts used. Anything with a hemi is expensive.
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