Anybody else rockin the 305?

[Bearcat91]

My 400 was a 305 tbi 5 speed and I loved ever bit of it! Got 20 mpgs high way would smoke the hell out of the tires but was slow as hell Haha

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[glfirefighter144]

i'm glad y'all have 305s smoking tires, my 98 350 won't, it kinda just squats and goes, maybe i need a less performance tire on it, my firestones just don't slip much, but i guess the G80 helps with that too

 

[gm muscle]

Stock 5.3 vs stock 5.7? I haven't seen it. Let me know what you guys are doin'!

 

[VorTecxas]

Stock 5.3 vs stock 5.7? I haven't seen it. Let me know what you guys are doin'!

Not much, really. The Sierra in my sig didn't have much done to it when it had the 350 in it, it's all here -
http://www.gmt400.com/forum/showthr...ds-quot-with-dyno-results&p=363847#post363847

The other one was my '98 SCLB 2WD 3/4 ton against my cousins '03 SCLB 2WD 3/4 ton, they had about the same mileage on them too, around 120,000. That one just had dual flowmasters, other than that it was bone stock.

 

[VorTecxas]

i'm glad y'all have 305s smoking tires, my 98 350 won't, it kinda just squats and goes, maybe i need a less performance tire on it, my firestones just don't slip much, but i guess the G80 helps with that too

That's weird, something's not right, or your tires are just really sticky. The '97 Tahoe I just picked up has the 3.42 G80 as well, and it breaks the 255/70s loose instantly. The only one I had that wouldn't spin was the '99 Yukon I just sold. I didn't have it long enough to figure out why, but it ran perfect and got great mileage.

 

[glfirefighter144]

That's weird, something's not right, or your tires are just really sticky. The '97 Tahoe I just picked up has the 3.42 G80 as well, and it breaks the 255/70s loose instantly. The only one I had that wouldn't spin was the '99 Yukon I just sold. I didn't have it long enough to figure out why, but it ran perfect and got great mileage.

I Don't know either, but I get around 20 MPGs and its not a hot rod, so it don't get treated rough very often, so it doesn't bother me, the 96 on the other hand can be a handful if given too much skinny pedal and its 3.42s and 315s

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[OlSmokie]

My '90 has the 305. I thought about a bigger engine but I would like to keep my truck original and the 305 does everything I ask of it.

 

[98chevyz71]

My 400 was a 305 tbi 5 speed and I loved ever bit of it! Got 20 mpgs high way would smoke the hell out of the tires but was slow as hell Haha

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that makes me want a 305, 20 mpg wow

 

[glfirefighter144]

that makes me want a 305, 20 mpg wow

A 2wd 350 Vortec is capable of 20+, just requires a feather foot and highway driving i.e. no interstate

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[98chevyz71]

A 2wd 350 Vortec is capable of 20+, just requires a feather foot and highway driving i.e. no interstate

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the best ive got is 18mpg highway with my 4x4 350 vortec