I wrote this before looking further into it. The roller tip on the crower rockers sit below the rocker body on top but underneath where the roller touches the valve stem the roller hangs below the body. I thought my feeler gauge was running into the rocker body but its not. Also I would of swore I had set the lash at .010 but when I checked on a cold engine recently they were between .012 and .014. Running that m21 with 3.31 gears I wanted to possibly recover a little low rpm torque. So for now Im leaving the ones at .014 and loosening the tight ones to .014.
I find it hard to just go by feel. I could get a .012 feeler in there and feel snug. But if I took a .015 or maybe even a .016 and really pushed hard I could get it in there. I found it easier to check by actually doing what Rhoads recommends. I put the feeler in there and lock it down when i can barely spin the pushrod with my fingers.
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007
(cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD
1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86'
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