BP6D build valve options
Hey guys,
I'm looking to do a mild head shave with a BP6D. Shooting for 160-170whp. Major parts list is the following. -Squaretop -Maruha 264 degree intake VVT cam -Maruha 264 degree exhaust cam -Supertech light doubles/titanium retainers -SUBs -E85 -SuperMiata damper -Boundary oil pump Anyway, the question is, do I stick with stock valves or go with supertech +0.6mm back/undercut? Is the hp/$ there? I've been searching for days but can't find any information or results on these. Another option would be going back/undercut on the intake side only. I am avoiding going oversize as it doesn't seem to be a great payout for the headwork involved and my power goal. Any opinions? |
searched again, found my old thread. opinions?
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+1mm intake and stock exhaust size here, both ST.
Some will argue that +1 or even +2mm exh will help. My builder did not see the need for more flow there. |
I'm running +1 valves all around. The +2 might need some massaging of the valve reliefs depending on what pistons (CR) you're using.
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+1 valves increase flow at all lifts. No reason not to other than budget. +1/+2 combo balances head flow, particularly on heads with no significant porting.
+2 valves usually require larger valve reliefs on piston crowns. Industry standard for aftermarket pistons is to include reliefs only for +1 valves. |
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