Yes its alum. I'm in the process (very tedious) on match machining the girdle/top of the main caps for dowels. All 14 have to align. 3/4 done but not a job I'd want to do again any time soon.
In between this working on a buddy's TJ to sort out how to put a 4200 in it instead of the 355 sbc he is thinking of installing.
51 GMC 4.2 turbo Can't solved today's problems using the same technology/thinking that created them