Would it be more cost effective to have the 081s worked or buy a pair of bare S/R? What kind of flow could a first timer get out of the 081s, sticking with 1.84/1.5? If it's cheaper to get the 081s worked, does anyone in the chicago area know of a place that does a good job for decent prices? Site or # would be great, thanks.

 

The S/R's will need some work, at least in the bowl area. World leaves them pretty rough.

But, they already have 1.94" intake valves, screw-in rocker studs, and typically a little better casting quality.

 

Well if work will be required either way, how hard is it for a first timer to do? I'm looking for maybe 215 cfm @ .450, up from the 186 stock.

 

When I ported mine, it was the first set I had done. I followed the Standard Abrasives Do It Yourself Porting Guidelines, practiced on one cylinder worth of a stock head. You probably don't need to do everything they show (such as gasket matching), but the bowl area benefits greatly from their suggestions. I don't have flow numbers, however.

The things I'd do differently would be using carbide burrs for the major material removals instead of all sanding rolls, and "airfoiling" the guides.