What real world experiences have you guys had with upgraded valve sizes on a SBM with a 3.940 bore and small port heads?
"Conventional wisdom" says that 2.02's suffer from shrouding. Yet plenty of guys have slapped J heads onto 318's. (Biggest hurdle there is getting over the miserable compression ratio that combo typically yeilds)
I've got some 1.88's/1.6 which I had planned to fit to some 318 heads. But I'm wondering if it's worthwhile to take the next step. (2.02) Cam will be an XE 274.
Since I'll likely be getting the guides done too, I might even go to 5/16 stems if I go bigger than the 1.88's I've already got.
What thoughts have you?
