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This question pertains to small block ford engines, specifically a 289. From a number of sources its been recommended to tap the oil galley holes for screw in plugs. Many say to "just run a 1/4'' tap through the hole", but the hole is larger than that required for a 1/4" npt tap. For you guys that have done this yourselves, how do you usually do it?? Thanks
 

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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)********


_________________

5 second 1/8 mile



<font size=-1>[ This Message was edited by: fogged408w on 6/27/05 9:36pm ]</font>
 

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Be sure to check the lifter bores on the front when you are through tapping. My 306 had a burr in the lifter bore after the tap ran through. A couple passes with the lifter bore hone cleaned it up nicely.
 
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