[Brad B. Hillebrand]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Brew:
The 670s are considered a little small for todays pump gas, for the most part. You'd have to be a heck of a tuner and have exactly the right cam to make them work without fear of detonation. Or you could have your pistons dished to get to a more pump gas freindly compression ratio. Mid-70s 6Xs should be fine for a 400, or a 455 for that matter. </div></BLOCKQUOTE>

What? Can you explain the 670 a little further?