sorry but ive never had the privlge of owning a w block engine....
might want to email bob..... he probaly knows most everything there is to know about 348/409s
------------------
www.xframeimpala.com
68 4x4 short fleetside deluxe cab 327 air
56 big window short stepside 235 dual 1 brls
64ImpalaSS 327
70 C10 LWB fleetside custom/10 350/TH350