5 blade to a 7 blade well it help

[pedal2themetal]

That's the point. Now you need ... a shroud gives 3-4 times more air flow.

HI,
OK.. I ether had the gaskets on wrong or a intake leak .. I had them replaced and without a shroud its running 1/2 way between the first mark and the 1/2 way mark on the gauge just like it used to ... So its fixed without a shroud... I checked the air flow and its moving are thru the core all the way around holds paper tight ...