another j head question

Thanks BJR...I've been around all kinds of shops for about 20+ years..I've never seen a head "vaccum tested". It makes good sense, just never saw it...lol.


63, if your heads started at 61cc, they had already been milled a bit. I'd guess around .050" to go from 72-71cc to 61 ccs. Do I understand right you took off and additional .060? I havent cut small block heads that far ever. I cut big blocks to .100, and that's thin, but you have 5 bolts around the holes. Small blocks dont. If BJR had no issues, maybe you're fine. I'd bolt them on at this point anyway (you spent the $$ on them), but that's too thin on the decks to me. Be careful about the head bolt length too. They may now be too long like you worried about. And your valve train geometry will be WAYY off. Make sure you correct it.