headers without cats
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Freshman User
Joined: Dec 2001
Posts: 28
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From: cherry hill U.S.A.
headers without cats
m79f100,i have a 302 engine we took it out of a 74 f100,its going in a 79 f100,i got a pair of dynomax headers they are not shorties,i was going to run duals with glasspacks and no cats do you think the gasgets will handel it?or any other problems because of combustion?its 2wd long bed.also i can i tell what year this engine is?thanks for any help you might have. Mark.
Senior User
Joined: Nov 2001
Posts: 144
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From: Savannah US
headers without cats
You shouldn't have any problems. Removing the cats will free up some horsepower, give you better gas mileage, and make it sound alot tougher. It won't harm anything. I would recommend using dual flowmaster mufflers. They are undoubtedly the best sounding muffler available, and they have very little back-pressure. If you do decide to use flowmasters, purchase the 2 chamber model. I have dual exhaust/flowmasters with no cats on both of my trucks, they sound VERY mean!!!!! GOOD LUCK
"Don't Laugh At This Truck Mister, Your Daughter Might Be In Here!!"
'78 F250 4x4/351w/NP435/NP205
lifted/"35 mudders
'78 F100 2wd/360/C-6/"9 inch
4bbl int+carb
"Don't Laugh At This Truck Mister, Your Daughter Might Be In Here!!"
'78 F250 4x4/351w/NP435/NP205
lifted/"35 mudders
'78 F100 2wd/360/C-6/"9 inch
4bbl int+carb
Senior User
Joined: Oct 2001
Posts: 113
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headers without cats
[updated:LAST EDITED ON 14-Feb-02 AT 06:22 AM (EST)]There should be a casting code on the block somewhere. The earlier motors had it down on the side of the block by where the starter would be. Something like a D4OE-6015-BA would be a block made in 74.
Opening up the exhaust like that may require you to fatten up the carb a touch because it is now flowing quite a bit better than it used to. Just check your plugs after you get it going and if it looks lean go up 1 or 2 steps as appropriate. 1 or 2 sizes on the primaries and 1 or 2 sizes on the secondaries is probably all it would need unless you are also doing other stuff like a cam, intake, heads.
Opening up the exhaust like that may require you to fatten up the carb a touch because it is now flowing quite a bit better than it used to. Just check your plugs after you get it going and if it looks lean go up 1 or 2 steps as appropriate. 1 or 2 sizes on the primaries and 1 or 2 sizes on the secondaries is probably all it would need unless you are also doing other stuff like a cam, intake, heads.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
headers without cats
Ben, You better not be removing them cats in central NC unless you are replacing it. If my rememberior is working correctly it is a $50,000.00 fine to remove them. I'll leave it to you and let yall split them hairs down further. I don't disagree, just reminding, because they be looking up here.
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John
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In the cool still quiet of night, you can hear chevies rusting away.
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John
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[link:www.ford-trucks.com/users/jowilker|My Club FTE Page] Member since 01 01
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NCFTO] North Carolina Ford Truck Owners Group
In the cool still quiet of night, you can hear chevies rusting away.
