rocker contact pattern - Chevelle Tech
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post #1 of 14 (permalink) Old Mar 31st, 20, 7:51 PM Thread Starter
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rocker contact pattern

My pushrods for my 406 arrived today, so I installed them and checked my rocker contact pattern. I'm thinking the pattern will change slightly when the lifter pumps up, but is pretty good as is. I used Scott's method for figuring the length and the 1.6 rockers he designed for AFR heads. The sweep is .055
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post #2 of 14 (permalink) Old Mar 31st, 20, 7:55 PM
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Re: rocker contact pattern

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Originally Posted by nitrofox View Post
My pushrods for my 406 arrived today, so I installed them and checked my rocker contact pattern. I'm thinking the pattern will change slightly when the lifter pumps up, but is pretty good as is. I used Scott's method for figuring the length and the 1.6 rockers he designed for AFR heads. The sweep is .055
Well it sure looks like your efforts have paid off. Looks like a great sweep pattern. NICE!!

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post #3 of 14 (permalink) Old Mar 31st, 20, 8:37 PM Thread Starter
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Re: rocker contact pattern

Thanks, but I think Scott Foxwell deserves most of the credit. #1 for his video on proper rocker geometry and #2 for designing the rockers.
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post #4 of 14 (permalink) Old Mar 31st, 20, 11:33 PM
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Looks great to me as far as centering the roller tip, how wide is your sweep?


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post #5 of 14 (permalink) Old Apr 1st, 20, 1:38 AM
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Re: rocker contact pattern

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Thanks, but I think Scott Foxwell deserves most of the credit. #1 for his video on proper rocker geometry and #2 for designing the rockers.
Hey wait a minute! "NitroFOX" eh? Are you Scott Foxwell's advertising department???? ...just kidding. Scott seems like a great guy, and has helped me out more than he knows. Actually, I was giving you the credit for watching his vid and paying attention to it in the first place, as well as puting what the vid says into practice. That's what I meant. His vid does nothing if people don't take the time to watch it, and I know many do. Scott has done what he can, and more than most would do. He can lead us horses to water, but he cannot make us drink. That part is up to us.

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Looks great to me as far as centering the roller tip, how wide is your sweep?
I think you missed it Rick. He said it was .055"
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post #6 of 14 (permalink) Old Apr 1st, 20, 10:53 AM
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Re: rocker contact pattern

How wide is that sweep? Looks kind of wide to me..


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post #7 of 14 (permalink) Old Apr 1st, 20, 11:38 AM Thread Starter
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Re: rocker contact pattern

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How wide is that sweep? Looks kind of wide to me..
Just for comparison, I just measured the gap of the spring keeper next to it and a .046 drill bit just slides in.
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post #8 of 14 (permalink) Old Apr 1st, 20, 12:32 PM
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Re: rocker contact pattern

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Thanks, but I think Scott Foxwell deserves most of the credit. #1 for his video on proper rocker geometry and #2 for designing the rockers.
Thanks for the kind words Jeff but you did the work. Good job.

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post #9 of 14 (permalink) Old Apr 1st, 20, 12:59 PM Thread Starter
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Re: rocker contact pattern

Scott, just curious, what will change on the pattern when the lifter pumps up?
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post #10 of 14 (permalink) Old Apr 1st, 20, 1:34 PM
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Re: rocker contact pattern

That push rod geometry video is an easy to understand must view.

Much thanks to Mr Foxwell for taking the time to put it together.

Looks good to go to me Jeff. Enjoy the build.
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post #11 of 14 (permalink) Old Apr 1st, 20, 1:49 PM
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Re: rocker contact pattern

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Originally Posted by nitrofox View Post
My pushrods for my 406 arrived today, so I installed them and checked my rocker contact pattern. I'm thinking the pattern will change slightly when the lifter pumps up, but is pretty good as is. I used Scott's method for figuring the length and the 1.6 rockers he designed for AFR heads. The sweep is .055
I donít think it gets any better than that! In the ďold daysĒ twice that amount was a ďrun itĒ approach. Iíve run wider than what you show (center third mentality ) and have had no issues. Not sayin to do it that way just sayin great job.

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post #12 of 14 (permalink) Old Apr 1st, 20, 3:43 PM
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Re: rocker contact pattern

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Scott, just curious, what will change on the pattern when the lifter pumps up?
Depends on how much it pumps up but technically, if you are not getting full lift when you roll the engine over, then you're not getting the full pattern. Here's the deal, though...I developed this method so that you really don't need to roll the engine over to check the pattern. I was thinking of guys doing this in the car with full running valve train, not wanting to deal with a collapsing lifter. If you follow the video and take the time to get that initial 90* relationship as close as you can, then the rest is math. Trust the math. If you get the geometry right, the sweep is what it is. It will be as narrow as is possible, taking all other factors into account.
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post #13 of 14 (permalink) Old Apr 1st, 20, 6:40 PM Thread Starter
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Re: rocker contact pattern

The more I think about it, the lifter never does compress using your method, so pumping up isn't a factor. Just second guessing myself, I guess.
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post #14 of 14 (permalink) Old Apr 1st, 20, 6:53 PM
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Re: rocker contact pattern

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Just second guessing myself, I guess.
I know how that is. For those of us who don't do this for a living, and who aren't retired and therefore don't have the time on our hands to be doing this every single week, this engine stuff sure can put our minds into overdrive while we're trying to do things right and leave no stones unturned. Because of that, it can become easy for us to begin second guessing ourselves all over the place. Been there/done that.

But a constrast to that are guys like my friend Chris, (not a member of this board) who for the most part is a decent mechanic, but he works so fast that he often has bolts or screws left over after he completes the work, none of which he knows the origin of, other than being from the same vehicle he just finished working on.
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