i have pin hole in exhaust manifold, need to replace('03 f-150). should i replace with stock manifold or upgrade to header type? what's ur opinion.
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Answer #1pushrod March 17, 2013, 22:33Master
Cant fix stock manifold by welding or brazing? I would replace with stock as both would have to be replaced otherwise, to run right. Think they only use V engines in this one so need to use stock or both. Wish they still had the 4.9
best engine for a truck i know of, Inline = a bunch of torque! What was the last year for the 4.9, 98-99?
Replyarturo08, March 18, 2013, 12:38Master
99. a buddy had one. well with the age of the ride and the mileage i was thinking of doing both anyway. if 1 is going, the other may be just behind. this is triton v8 4.6. 300,000 kil. and still tons of torque. had to replace exhaust last fall so upgraded to true dual exhaust. found spark plug and coil boot cooked on number 6. trying to balance the burn. mechanic buddy of mine tells me that these types of trucks usually show this tendancy off the left bank. my theory is it's the exhaust set up. picked up an extra boost for torque after modification. just curious to see if you had an opinion about completing the upgrade. i worry if i do, y pipes may crack with the hot and cold. i live in northern b.c. canada.
Replypushrod, March 18, 2013, 15:24Master
Does it still have the Y pipe? You stated true dual exhaust.
Replyarturo08, March 18, 2013, 21:09Master
no. got rid of the y pipe. figured that was part of the cooked boot problem on the left bank. just play'in a theory so both pipes are designated(way more torque on the high way). the y pipe i was referring to was a style of header i was lookin at. more of a long tube style header.
Replypushrod, March 18, 2013, 21:14Master
Heat/cold fluctuation aint going to hurt the header!
Replyarturo08, March 19, 2013, 00:00Master
thx for your input. made up my mind for me.