Aeroflow now offer a line of performance XPRO distributors for the most popular V8 engines. The bodies are machined from 6061-T6 billet aluminum utilize a chromium manganese titanium steel gear (20CRMOTI) which is suited for use with most camshafts (refer to camshaft manufacturer). These distributors are ready to run and do NOT require an external ignition box. The internal ignition module features a built-in adjustable rev limiter. Aeroflow XPRO distributors are easy to install with only 3 wires to connect with weather tight connector and wiring harness included. Simply connect power, coil negative and earth. they also come with a grey output wire that is used to send a tach signal and set your built-in rev limiter or trigger your aftermarket EFI system. Height from base of collar 233mm (9-3/16"). Total width of cap 120mm (4-3/4").