Tom,
In lieu of a rulebook here is your answer. Yes, a V4/BGL class does exist. The listed record of 102 should be in the V4F/BGL class. This record was overlooked when the V4F class was expanded this year.
A little research will have to be done but, I feel confident that the class is open.
No turbos allowed.
DW
Wow my first post on here and I'm bringing up a thread that's 3 months old!
Anyways, I would like to make a bit of an addition to what Mr. Warner has mentioned. You can in fact run turbos on vintage engines IF you're not running in a vintage body class. For example:
V4/BGR - No turbos allowed
V4/BGS - Turbos allowed
We (my dad, brother, and I) had plans on running a turbo setup on our flathead four-banger that we had in Cree's lakester but a rod let go during our record run (142 mph on a flatty four is pretty good, eh?). Oh well... maybe next year.