what throttle body
 

On a car with 255 walbro fuel pump, ls6 manifold, 224/224 581 114 lsa cam, ls6 stage 2 heads, slp air lid, 125 shot nitrous. should i go with bbk 80mm $240, or a stock ported 78mm $180.

just port it yourself for $10 and put the $$$ some where else! that counts!
heads, tires, clutch, vert, suspencion, ...

I agree porting your own is the best method, ive heard of up to 8 hp on a dyno jet with a self ported throttle body.

CMC

home porting will do just fine...that or get jantzer or bauer to do it.....btw this belongs in the externals forum....

where would i get the new 78mm blade at, and do you guys know any instructions on how to do it

You dont need a new blade just port the reduction in size before the blade opening. www.ls1howto.com has a write up i belelive, its very simple.

CMC