tire 10 Report post Posted April 12, 2010 (edited) clickme Correct me if I'm wrong but a casting number ending in 885 makes it a m20b25 head, thus it is probably of interest to someone here. Please please buy it before I do Edited April 12, 2010 by tastic Quote Share this post Link to post Share on other sites
E30 325i Rag-Top 2956 Report post Posted April 12, 2010 Excuse my ignorance, but are there any differences between a 320 m20 head and a 325 head? Will it bolt straight up? Quote Share this post Link to post Share on other sites
mitchE30 0 Report post Posted April 12, 2010 yes,they will bolt straight.but 885 has bigger intake size. Quote Share this post Link to post Share on other sites
e30ftw 410 Report post Posted April 12, 2010 Head isn't designed for the m20b20. The combustion chambers don't match the pistons so compression on your m20b20 will drop. But it does have bigger intake and exhaust ports. Quote Share this post Link to post Share on other sites
