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Scorpion 1054 on 291C |
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hoosieramc
AMC Addicted Joined: Jul/03/2007 Location: Indiana Status: Offline Points: 1233 |
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Posted: Apr/26/2017 at 6:52pm |
Putting Scorpion 1054 Roller rockers on a 401 with 291c heads. Came up with a pushrod length of 8 inches. I happened to have a set of Edelbrock pushrods #9637. Looks like these will work good. Can anyone verify similar results?
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69 ambassador 390
Supporter of TheAMCForum Joined: Nov/22/2009 Location: Peoria, AZ Status: Offline Points: 3539 |
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8.0 is what we usually use for that setup. Valve stem height can affect this though. On Scorpions we have had to go to Trick Flow pushrods. We have had several failures of the hardened pushrod tips on other brands. The Scorpions have very hard pushrod seats and some popular brand pushrods seem to have quality control issues in their heat treating. If you lose adjustment after running for a few hours, check the pushrod tips for wear.
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Steve Brown
Algonac, Mi. 69 Ambassador sst 390 84 Grand Wagoneer 69 Cougar XR7 65 Fairlaine 500XL 79 F-350 Super Camper Special |
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tufcj
Supporter of TheAMCForum Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Online Points: 4065 |
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Lots of variables (lobe diameter, block decked, heads shaved, rockers). I think I used a 7.9" pushrod with Crane Gold rockers in my AMX.
This is a good video: Rocker Geometry Bob tufcj Edited by tufcj - Apr/27/2017 at 10:07am |
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69 AMX
74 Javelin AMX 67 Rogue If you need a tool and don't buy it... you'll eventually pay for it... and not have it. Henry Ford |
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hoosieramc
AMC Addicted Joined: Jul/03/2007 Location: Indiana Status: Offline Points: 1233 |
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Watched the video. You made me do math! And it works. I came up with 8.0 initially. Then I used the 90 degree method and did the math. Came up with 8.1. Did a sweep check at 8.0-8.05-8.1. The 8.1 yielded the best pattern with a 3/32 sweep and was centered on the valve tip. Pretty confident I have the geometry right now. Going to order some Trick flow push rods.
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AMC RICK 401
AMC Apprentice Joined: Aug/06/2014 Location: Ohio Status: Offline Points: 207 |
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I used 8.1 push rods on my build with Scorpions but make sure you get good quality pushrods.
I had 1 set get chewed up because of the hard seat in the rockers. I went to chrome moly and works great |
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1969 SC Rambler
1974 Jeep CJ5 Dirt/Sand Drag Racer w/401 TH400 Tube Chassis Dirt/Sand Drag Racer w/401 Powerglide "We are not here for a long time but we are here for a good time" |
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