So to flycut for 2.02 and 1.60 valves you should use cutter-valves in approximately 2.06+ and 1.64+? What size valves should be used if flycutting in this method?
A 2.08 valve wouldn't be too big, I had a set of LS6 heads with 2.08 valves. A 2.08 valve would be a good choice to cut a relief for a 2.05 valve. On my car, we just used the stock size valves and ended up going in and hand finishing them with some sandpaper and a small grinding stone because of what Predator-Z said - I wanted to make damn sure there was no chance the valves would hang up in a valve float situation.
__________________ '98 NBM Formula M6/ Hooker Super Comps w/TSP True Duals/ lid/custom 85/85 FAST/ CNC Ported 241's/ Streetsweeper 228/232 on a 111 LSA/ Six Speeds Inc. Stage 4 T-56/ Hurst Billet Plus with chopped stick/ Monster Level 3 clutch/ S60 w/ 4.30s and a spool www.michiganspeed.com
I finally got around to doing this over the past weekend. Worked like a charm. TEA threw in an old 2.04 valve they had lying around when I had them do a VJ on my heads and I used that. I only cut the intakes .040
Thanks for the tip.
One question..... how smooth do the reliefs really nead to be??
__________________
Chuck
85 Iroc drag car, 572 BBC, 5.88 @ 121 mph N/A, so far
98 Z. Lid, kooks LTs 3600 yank, custom cam ready for install.
I finally got around to doing this over the past weekend. Worked like a charm. TEA threw in an old 2.04 valve they had lying around when I had them do a VJ on my heads and I used that. I only cut the intakes .040
Thanks for the tip.
One question..... how smooth do the reliefs really nead to be??
take few minutes to sand em or file down the sharp edges. leave a bullnose finish on the sharp edges. as smooth as possible
