Do GT-40 Y heads take Tapered seat or Gasket Type plugs?

Hey guys Im Installing a BLower for a friend of mine that has a 93 F-150 4x4 and his motor is a 331 Stroker with GT-40 Y heads..He is running Tapered seat plugs but Im wondering if they should be Gasket type like Most aluminum heads use..Im needing to Go 2 or 3 steps colder a Plug for this motor so thats why Im needing to know...Please let me know if you know for sure..Thanks guys..

BTW, Anyone know what happened to the Corral.net? :shrug:


Jeff
 
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