When did FORD improve 4.6/5.4 heads?
#16
My 99 E-350 has 146,000 on it, the 5.4 had the plugs swapped at 97,000 miles, I've not had one issue with them yet, but MPG has greatly deceased lately.
Thread
Thread Starter
Forum
Replies
Last Post
Katmandu
Modular V8 (4.6L, 5.4L)
262
03-07-2018 10:32 AM
lil'ford
1987 - 1996 F150 & Larger F-Series Trucks
10
01-21-2015 01:22 PM
csangster
Modular V8 (4.6L, 5.4L)
2
04-07-2009 07:23 PM