Update: Valvetrain and Lash Caps
Thread Starter
Race Director
Joined: Dec 1999
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From: Forked River NJ
Update: Valvetrain and Lash Caps
As an update to my post a few days ago.
http://forums.corvetteforum.com/c3-t...n-experts.html
I got the lash caps and mocked up the valvetrain again to check the pushrod length and conatct pattern on the valve. Now the caps are .080 thick so I figured I would need at least .050 longer pushrods. Mocked it up and the checker told me I needed a pushrod .060 longer. Before the caps it told me I needed about .045 longer. It looks like it does not go hand it hand as the valve gets longer the pushrod needs to go longer at the same rate. Anyway here is my latest contact pattern with the same pushrods as before. Looks pretty good. The picture is not as good due the the caps being a darker color than the valve tips. Also a picture of the cap on the valve tip. Some suggested be careful the cap does not rest on the valve keeper. As you can see it is not close at all. The caps are right from AFR. I now need to shim the springs to the correct height for the correct spring pressure. I just need to order them. Not a good local speed shop around here. It looks good here. I'll run it like this.
http://forums.corvetteforum.com/c3-t...n-experts.html
I got the lash caps and mocked up the valvetrain again to check the pushrod length and conatct pattern on the valve. Now the caps are .080 thick so I figured I would need at least .050 longer pushrods. Mocked it up and the checker told me I needed a pushrod .060 longer. Before the caps it told me I needed about .045 longer. It looks like it does not go hand it hand as the valve gets longer the pushrod needs to go longer at the same rate. Anyway here is my latest contact pattern with the same pushrods as before. Looks pretty good. The picture is not as good due the the caps being a darker color than the valve tips. Also a picture of the cap on the valve tip. Some suggested be careful the cap does not rest on the valve keeper. As you can see it is not close at all. The caps are right from AFR. I now need to shim the springs to the correct height for the correct spring pressure. I just need to order them. Not a good local speed shop around here. It looks good here. I'll run it like this.
Race Director
Joined: Apr 2000
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Looks good, I run lash caps with solid roller cams until AFR came out with odd sized valve stem diameters that didn't fit the lash caps I bought from Comp so I don't have the lash caps on my 427ci 
Team Owner
Joined: Apr 1999
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
That looks good to me!
I had an engine that the underside of the roller tip CC 1.6 RR's were touching the edge of the spring retainers. Lash caps were the answer to extending the valve stem tip for additional clearance.
I had an engine that the underside of the roller tip CC 1.6 RR's were touching the edge of the spring retainers. Lash caps were the answer to extending the valve stem tip for additional clearance.
Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
