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R90 head work
Posted: Tue Oct 04, 2011 6:16 pm
by 2valve
hi to all , whats 3 stage valve work mean ? what does it involve getting done ? any links / pictures / specs for the job to be done or any info at all with regarding serious head work , whats worked for you !
sorry if this has been asked before but couldnt find anything on the new forum
Re: R90 head work
Posted: Tue Oct 04, 2011 6:48 pm
by dougie
I believe it is also referred to as a 3 angle valve job.
A series of 3 cutters are used on the seat. a basic surface, a bevel sloping out to the chamber and a bevel sloping into the tract.
Re: R90 head work
Posted: Tue Oct 04, 2011 9:38 pm
by vanzen
This on a Camaro 350, but the principle will be the same;
The LS3 head uses 60-46-30-degree multiangle finishing on the seats and a 45° on the valve faces.
Some builders use 5 angles ...
Multi angle seats promote the flow (characteristics) of fuel mix into the head.
The area of actual valve / seat interface will be important, too.
Enough area will be needed to promote heat transfer, too much area restricts flow.