I believe group 41 is the one that is correct for non-vented applications.
Interstate Battery now sells the MTP-91, which is also correct and a
replacement for the MT-66, and is vented with a tube on top. That battery is
what goes into all Vanagons I sell or drive. When comparing CCA's, be sure
you are comparing the ratings at the exact same temperatures, some
manufacturers like to brag up their batteries by rating them at a higher
'cold' temperature, thereby achieving more CCA.

Karl Mullendore
Westy Ventures
1987 Syncro Westfalia 1.9TD
1985 Transporter singlecab

----- Original Message -----

> >650 CCA is pretty good, although you can get ones up to 900 now I think
(I
> doubt
> >in the group 42 though).  Be sure to check what temperature the CCA
rating is
> at.
> >I think it's standard, but see if it's -30 or -25 or what have you.
>
> CCA is measured at 0 degrees fahrenheit (found this out today) and 650 CCA
seems
> to be about
> all I can get in Group 41 or Group 42 --- some of places I've
> called seem to think that Group 41 is the size and the local Interstate
> Battery dealer says a Group 91 will fit too. This is probably in Bentley
but
> my Bentley is down the street in the van --- I need an office copy (on CD
> maybe..)