VR 1 Dino
oil for break in and then go to
Amsoil synthetic . We have similar engines except mine is 482 cubes and aluminum block , solid roller etc and I do go to 6700 rpm every now and then .
Blair Patrick did my engine ( lives fairly close to me ) and he recommends and uses either VR1 20W-50 and more recently ,
Amsoil full
synthetic after break in .
Amsoil was the
oil all contestants had to use at the last Engine Masters competition , which Blair won again with his prepped 390 FE .
He told me that when they pulled his engine down for inspection , there was zero wear and he just put the bearings etc back in .... said he was impressed with the
oil.
One thing I like is the max temp on that oil . On the track , I sometimes see 220 degrees and the Amsoil loves high temps . I`m in SC and we see Summer temps in my area in the upper 90`s fairly often .
I use Amsoil Signature Series
synthetic 5W-50 as recommended , hard to find sometimes but worth it .