99 completely stock 454 upgrades

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454cid

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Found it by digging through my Ebay feedback..... I couldn't find the label I cut out of the box for this particular item.

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Dravec

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I didn't know the 350 got one..... it's probably the same fan. The 454 does use a different clutch, Though. The 454 clutch uses 4 bolts like my Buick engines.
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BNielsen

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Poke through here and get some ideas; the bare minimum for a 454 should be tune and exhaust imo...

Vortec 454 Thread

And on the topic of fans; the S10 fan is a direct bolt on. It's what I've got on my truck, and when it spins up it'll go from 210+ to almost 170 in like, 2 minutes of driving.
 

Schurkey

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Totally stock?

CUT THE MUFFLER OFF, use two aftermarket mufflers, one for each pipe.

The OEM muffler is wildly restrictive. The inlet is 2 3/4" diameter; but the inlet pipe is necked-down inside the muffler case.

Friend of mine with a '97 K2500 7.4L claims that replacing the muffler made more difference than replacing the iron manifolds with Gale Banks headers.
 

BNielsen

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I'm guessing it's way quieter too.
A bit quieter; you can hear it in the cab when it's spinning up but outside it's not screaming like the old metal fan.

Totally stock?

CUT THE MUFFLER OFF, use two aftermarket mufflers, one for each pipe.

The OEM muffler is wildly restrictive. The inlet is 2 3/4" diameter; but the inlet pipe is necked-down inside the muffler case.

Friend of mine with a '97 K2500 7.4L claims that replacing the muffler made more difference than replacing the iron manifolds with Gale Banks headers.
This x1000
 
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