I`ve been on this discussion group for about a week now,and you really
seem to know your stuff.I know a bit myself,but not as much as you.So I
got a question for you,or anyone else.
I have a `97 1/2 ton with the 5.7 and 3.73 gears.
I was thinking about putting headers,and cold air intake on,and a new
mass air flow sensor.What kinda gains,or losses could I see? Any input
bad or good,would be fine.
On Sat, 31 Jan 2004 20:17:12 -0600 (CST), email@example.com (Bill S)
use full length headers, shorties are worthless (i.e. the gain isn't
worth the trouble of installing them)
again, they're pretty much worthless and you get stuck with a sh*tty
filer (K&N). if you've got the skills, incorporating a NACA duct into
the hood or functional cowl induction will actually net you something
again, wasted money. unless you get a turbo or a blower on it, the
MAF will flow plenty for the 350.
the biggest bang for the buck you could do would be to drop in a 4.10
gear set. it'll cost you somewhat in the mileage dept, but the gains
you get in towing and acceleration are well worth it.
also, if you're truck is an auto and doesn't have an external
transcooler, go out and buy the biggest one you can find and install
I`d love to do a blower,but don`t have the cash.
As far as the headers that`s exactly what I was thinking.
Do you really think I will notice a big difference from 3.73`s to
I was kinda thinking not really,but I`m no mechanic.
I'm going to echo Bret's advice with the exception of the 4.10's. Full
length headers, and don't go bigger than 2.5" pipes if you're running new
pipe as it'll kill your torque. You already have a cold air intake as the
intake point is at the front of the truck. MAF is unecessary; you only need
a modified MAF if you're using a forced air induction system (blower or
4.10's are gunna net you 10% more rear-end rotations per rotation of the
engine, which will increase launch speeds, but not all that much. A good
set of headers plus X or H crossover, true duals and good mufflers will net
you more bang for the buck. The gear change will run about $200 for the
riung and pinion and maybe $300 for installation, which is not for the
ill-equipped DIY'er. You can run headers, crossover and duals yourself for
less than that.
I already run Flow Master Mufflers,with stock size exhaust pipes,but
duals. Should I run bigger exhaust than stock? How big is stock?
Also,I should leave the stock air induction,but change the mass air
flow sensor? Is that correct?
Read my post again dude, I thought it was pretty clear. Leave the air
intake system alone, no need for modified MAF, headers with X or H crossover
would be great. Leave the pipes you already have run, just add some headers
and a crossover.
A 10% increase in rear-wheel rotations per engine rotation doesn't directly
convert to an extra 10% HP and ft/lbs at the rear wheels, plus, it's gunna
hurt his fuel economy.
A nice set of headers + crossover will help his fuel economy and net him the
same if not more FLYWHEEL horsies and ft/lbs and cost less than a rear-end
I think we're gunna have to agree to disagree on this one bud!
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