I have a 1979 F150 that I use for mud bogging. Last year I added headers to it and the installed glass packs. Ever since putting them on I have been extremely unhappy with the sound. It’s 3x more quite than I would have assumed it would be. I see a lot of the guys out there running straight pipe off the headers and I’m wondering how bad that actually is? I was always told that the lack of back pressure could cause you to burn valve seals. Is that true?
Don’t worry about valve seals as Ford has none! I assume you have a carburetor. Just keep an eye on the spark plug porcelain. Using no-lead fuel is tricky when reading the plug white ceramic porcelain inside the ground electrode. Make sure there is a light grey color with no round glassy specks. If the porcelain is white as snow with tiny round specks the carb is slightly lean. This sometimes happens when the exhaust back-pressure is reduced.
Your original question about excess valve heat is caused by a degree or two much total spark advance and or a lean condition. Headers actually remove heat from the valves. If you had no headers or exhaust manifold the valves and valve stems would overheat warp or burn.
If you do off road stuff and want race only mufflers, Schoenfield and Dynomax both make open straight through large diameter glass-packs. It’s totally up to you what sound you’re after. The large diameter mufflers have a deep growl. Small inside diameter glass-packs have a snotty high pitched cheap sound in my estimation.
Go to Dynomax Mufflers and listen to the sound of every muffler they sell on your sound system of your computer.
Does anybody know about mud racing in Alabama? Not the straight line mud bogging, but the obstical course style. I only know of one track that is open in Tuscaloosa county. Are there any other tracks? Where are they?
Here is a link to a forum that lists all different types of mud racing clubs
I have a 1979 F150 with a 9" lift and 38" tires that I use for mud bogging. I’ve been wondering lately how much horsepower that motor actually had when it was stock? Mine has a couple modifications such as an Edlebrock 4 barrel carb (don’t know how many cfm) and headers, but I’m really curious as to how much power it had when it was stock. Thanks in advance!!!
79 351 was around 200 hp, and almost 300 torques
We’re putting together an event in October in Philadelphia, PA thats going to have Mud Drags and other events.
Is there any Mud Bog (4×4) Groups or Clubs in that area?
I don’t know of any clubs but you can get a hold of OK Four Wheel Drive and ask for some one there. They are hosting a truck pull and mud bog in the begining of August. Phone # for them is 908-845-6973.