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Well, machine shop said they wouldn't touch it! Heh, they don't mess with "Imports". That is THE only machine shop in this local area. Looks like I'll have to find a reputable shop to ship this off to : /. Yea Star, funny thing; when I put my intake gasket against the intake ports they...

I'm heading to the local Machine Shop today, going to see if they have a flow bench and talk to them about my plans. If anything, I may just go with all oversized valves and see how close I can get the exhaust with porting/polishing, but only port the intake enough for the new valves.

It is a Group Buy Pre-89 Carbon Fibre Lip Duane made a longggg time ago :). Not sure if they are available or if it was a one time thing.

I can really hear mine open up if I rev it to 6k with the hood open :). But, if your driving its a TON louder, although not possible in your situation :(.

:rofl:, now thats a mean Tricycle. I once heard running High Octane Race Fuel could burn a hole in your pistons? Fact or Myth?

Sure! I'm still searching around to see what would be better, increased flow all across the head with 7X% Exhaust->Intake. Or, try and bring that closer to the 90% with a little less flow from the intake side overall. Choices...:1zhelp: Edit: I have yet to find some really indepth...

My Pre-89 Bumper :icon_bigg . ^Dirty grill FTL :(

Exactly what I have in mind! I was just wondering if there were any issues with only the exhaust valves being oversized.... I guess not :evil2: .

I know this subject has been beaten to death several times over, but I have yet to find the answer I am looking for. Upon searching SM and SF I have come to the conclusion that the stock head flows enough for close to 600 RWHP. However, I am currently Over-Building a 7M for a daily 600 RWHP...