these heads have great flow numbers and flow sheets included flow at .800 390 on intake and 265 on exhaust. heads are fresh ready to run with manley valves titanium retainers and nextek roller springs set up to handle up to .830 lift. intake is matched to the heads and also ported 1400.00 for everything. heads were done by modern cylinder head in michigan. will split the shipping cost,heads are complete and ready to bolt on!