Then its settled the x/j flow about 220 cfm in stock 2.02 form, dulich did a flow on a stock x way back and it was over 220 cfm flowed more than a BB 906 head, those x/j's are a big reason the 70/71 demon dusters were mid to low 14 sec cars stock.
Just be careful about flow numbers. According to the Shady Dell web pages the stock J-heads with 2.02 valves flowed 200.8 CFM and the 576 LA heads Hughes tested flowed 212 CFM and the magnums 209. As a comparison the as cast 2.02 Iron Ram head flows 247 cfm on the Hughes bench.
I don't know where the numbers previously sited came from but it was not from the Hughes or Shady Dell web page.
And as I previously stated the variation from flow bench to flow bench can be quite significate so the only real comparison that can be made is tests performed on the same bench.
