Ahhh got ya Duane!
Didn't know if you had access to CNC equipment!
In that case I'd run the digitising probe over the stock pully and generate the code based on that so it's 100% accurate.
Figgie: I went for the Shimless buckets and Ti retainers as it all adds up ;)
I'm not saying you have to do it this way for high RPM but it makes life on all of the components a little easier if you can pull the weight out.
Boost will act on the backside of the Intake valve reducing the...
Duane: Easy way around this if you're not planning on production would be grab a piece of HSS and grind it to suit the existing pully then plunge cut them.
All you need are the groove centres 0 first cut then move the topslide xx and plunge the next groove and so on.
Colin: The stock retainers and locks are pretty storng parts and should be fine even with upgraded springs.
I changed mine out for lighter components so I can rev it harder than stock redline.
Jon: Good post! :)
Colin: Usually to get more HP you'd turn the motor faster so stiffer springs are needed to keep the valves under control but in our case we turn the boost up.
This in turn acts on the back of the Intake and tries to unseat the valve add to this the stock springs have very little seat pressure...
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