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Hi walt. That tool looks a bit like mine - except it looks like it probably works a bit better, and on the exhaust side too. One thing I did with mine was to braze another piece of the steel under the lever just where the valve adjuster hits. This doubled the distance I could compress the valve before the tool hits the case.
Thinking back on my previous track engine with a broken valve spring, yes it is the top end that noticeably suffers. I guess with half the closing force it gets to a point where the valve cant follow the cam adequately - varying with the spring strength and cam lift. In the region of 5-6000rpm I can recall a flattening of power.
I think my current issue derives from rings now.
Thanks for the pics - I am going to make one up like that next time I have the valve covers off.
Yes, I'd like to see Johns fingers too. I could barely depress my exhaust valves with a socket and extension bar - and I dont think I have high rate race springs.
regards
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
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