I would recommend getting the later 1980's 258 cylinder head, intake and exhaust manifold. Those 258's had 9.2:1 compression. Then you could do the Chevy 1.94/1.50 valve conversion, using the undercut stems for more low/mid range air flow. Picks up an easy 30 HP in breathing on a stock 258 in my '83 spirit GT. FYI, on a stock bore engine, I had the exhausts cut down to 1.45" diameter. Sincerely, Greg Taylor :) <>< And the testimony is this, that God has given us eternal life, and this life is in His Son. He who has the Son has the life; he who does not have the Son of God does not have the life. - 1 John 5:11-12 --------------------------------- Never miss a thing. Make Yahoo your homepage. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://splatter.wps.com/pipermail/amc-list/attachments/20080221/982b2ca4/attachment.htm _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list