correct, the tapered 1/4 tap will start loose. If you started with a 7/16 hole and just threaded it as normal then the screw in plug would only scew in a little bit and stick out causing interference with the camshaft retainer plate and/or the timing gear. You want the plug to screw way in so its flush.
If you want, make a practice run on something you can throw away untill your convienced it will work.
http://www.pricemotorsport.com/Oil_Restrictor_Kits/oil_restrictor_kits.html
Part No. OR-01
302-351W Oil Restrictor Kit
(4) 5/16-18 Straight threaded plugs
(1) 7/16-20 Straight threaded plug
(1) 1/2-13 Straight threaded plug
(1) 3/4 Cup plug
(4) 1/4-18 Pipe plugs
******(3) 1/4-18 Pipe plugs (for the front)********
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5 second 1/8 mile
<font size=-1>[ This Message was edited by: fogged408w on 6/27/05 9:36pm ]</font>