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The 904 kit increases displacement enough to provide more room in the cylinder for bigger valves which opens this motor up to higher Tq numbers at lower RPMs
I wonder how much bigger valves really would add IRL. I've got >57 lb ft out of my 904 with the OEM "small" ones. I honestly doubt (but I could be wrong) they would make so much difference. And when you think of the cost involved...
Dunno...I guess if your doing head work and really want to maximize biger valves is the way to go.
He had also mentioned that when doing MUCH bigger motors like the 1087 you need to go with bigger valves (as high as 6mm over) as well as SUB (Shim Under Bucket) to accomodate the aggressive cams.
The 904 stuff will cost a pretty penny if you decide to tweak it to max BUT anything bigger just gets ridiculous with the amount of modifications needed to squeeze those mods out.
SOLD: 07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq
NEW: 19 Goldwing Tour DCT
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