Hey all, I have a 401 I’m doing up for my 32 Tudor and I need somevalve train help and insight. To start I’m running an early isky RR3 roller cam and matching solid roller lifters. I came across a set of Tommy telescos roller tip rockers for a good deal and picked them up. Long story short I mocked up one cylinder with a pushrod length checker and it damn near looks like the pushrod is going to jump out of the cup in the rocker just rolling it over by hand. And it almost feels like I’m getting coil bind a little before I reach max lift, but there’s plenty of space between the coils of the spring. Only does it with the roller rockers. Does anyone have any firsthand experience running these? Is there anything in specific I should be looking for or inspecting? I also notice a 5/16” tip pushrod seems to fit much better than the 3/8” tip rod he says it needed. Im just curious why a 3/8” is necessary especially since it looks like it’s going to jump out of the cup when it’s at full lift. Thanks in advance for the help.
A couple of things to check- 1.6" installed spring height, and at least 0.090" valve clearance @ 10 degrees BTDC and ATDC. From the pic of the cup, a 3/8" ball looks large.
I agree a 3/8 ball looks big but I heard a 5/16 will block off the oil p***age ♂️. What exactly do you mean .090” valve clearance 10* BTDC and ATDC. Not valve lash right? Are you talking about valve to piston clearance?
Yes, valve to piston clearance. Another thing to verify is the pushrod clearance in the head hole with 3/8" pushrods. they may be dragging at full valve opening. I ***ume a minimum of .0025" valve stem to guide clearance on the intakes and .0035" on the exhaust.
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