Simply ask the builder what the bearing clearances are and that will guide you as to what grade (5W-30, 10W-40, etc.) to choose. Keep in mind that also depending on what group (IV, V, etc.) oil you choose to run can also have varying characteristics. For example, a group V 5W-30 can be similar to a 10W-30 group II or IV oil.
Use a WIX filter and if you don't know your bearing clearances, I'd go with Redline 10W-30 during the summer. The 5W-30 for winter - presuming you change your oil every spring and fall.
Last edited by anguilla1980; 04/18/2112:22 AM.
http://www.TheFOAT.com/92GTA 1969 Pontiac Firebird w/BP 461ci stroker kit, 670 heads & XE274H cam. Primer black with black interior. 1992 Pontiac Trans Am GTA w/SLP Performance Package. Dark Jade Grey Metallic, grey leather, T-Tops.
