Hi Lyndon My 91 S10 runs a 97 vortec 4.3 outa a full size 4X4 Using a 730 ecm with a modified ANHT cal. works great :peter ---------------------------------------------------------------------------- To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes) in the body of a message (not the subject) to majordomo at lists.diy-efi.org