Chevy 4.8L

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NathanY

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Anyone know about them? good, bad, ugly? New truck has one, and I like it so far. Pulls the $h!t out of my boat. Fiesty little motor.
 
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bluewater19

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Re: Chevy 4.8L

4.8, 5.3, 5.7, 6.0 All good motors from the same family. Early ones had problems with noisey rods/pistons at start up. Real solid performers!
 
ehenry

ehenry

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Re: Chevy 4.8L

I have a 4.8 in a 2003 Z71. It seems to be a good engine. Pulls anything i want to hook to it and cruises well on the highway.<br /><br />Does anyone know what 4.8 equates to in cubic inches? 305, 283 maybe the old Chevy 307?
 
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TilliamWe

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Re: Chevy 4.8L

bluewater, just want to clarify this statement, so noone will be confused:<br /><br />
4.8, 5.3, 5.7, 6.0 All good motors from the same family.
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that 5.7 is the one in the 1997-2004 Corvette. Not the same 5.7 that Mercruiser etc use in marine. So, not the "old" 350 chevy of small block Chevy fame.
 
Bob_VT

Bob_VT

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Re: Chevy 4.8L

The 5.3 (aka 5300) is the old 327 (actually 323 cu in).<br /><br />The 4.8 is 292 cu inch.<br /><br />The 4.3 V-6 is the same motor with 2 cylinders taken off (262 Cu inch).<br /><br />The 6.0 is 366 cu inches.<br /><br />And the monster 8.1 is 494 Cu in.<br /><br />Roughly 1 liter = 61.0237441 cubic inches<br /><br />The bigest improvement has been the aluminum heads and individual coil packs.<br /><br />Bob
 
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TilliamWe

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Re: Chevy 4.8L

Bob Bob Bob, where is Bondo when i need him? :( I will counter the misinformation, yet again:<br /><br />
The 5.3 (aka 5300) is the old 327 (actually 323 cu in).
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Wrong The 327 small block Chevy & the 5.3 Vortec Chevy are not even close to being the same motor.<br /><br />
The 4.3 V-6 is the same motor with 2 cylinders taken off (262 Cu inch).
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Wrong Again the 4.3 V-6 is a 350 Chevy with two less cylinders<br /><br />8.1 may indeed be 494 cu in, but Mercruiser markets it as a 496 cubic inch.<br /><br />I'm not picking on you Bob, but the "new" Chevrolet "Vortec" engines are very different than the small block Chevies that started in 1955.
 
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DJ

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Re: Chevy 4.8L

Agree with: TilliamWe.<br /><br />The ONLY resemblance between new GM engines. and engines of old. is the displacement-stretched, for marketing----ONLY! They're "ancient technology"-pushrods, etc, by todays standards). You would not buy a foriegn car with the same.<br /><br />Dream on-ALL. The old engines, you're favorites, wouldn't stand a snowballs chance of meeting '04, '06', '08' emissions standards, on a long shot.<br /><br />If you want to smell "pure gas" emissions, go for outboard, motorcycle or automotive-pre-1973.<br /><br />I'm with ya.
 
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TilliamWe

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Re: Chevy 4.8L

To answer Nate's original question:<br /><br />
Anyone know about them? good, bad, ugly?
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It's the same as a 5.3, just smaller displacement & lower horsepower & torque figures.
 
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TilliamWe

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Re: Chevy 4.8L

285hp @ 5600rpm and 295 lb-ft @4000rpm<br /><br />5.3 has 295hp @5200rpm and 330 lb-ft @ 4000rpm.<br /><br />Please note the 5.3 can vary by 15hp & 5 lb-ft of torque depending on the vehicle it is in. The numbers should be accurate for their installation in a 1500 series pickup.<br /><br />I am getting these numbers here:<br /><br /><br /> http://media.gm.com/division/2005_prodinfo/powertrain/specs/05_truck_engine_specs.html#lr4
 
all thumbs

all thumbs

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Re: Chevy 4.8L

I have the 4.8 in an 04 Z71. have it about a year now. Nothing that i can say bad about it. Highway 18 mpg or better depending on speed. city 14.5 mpg. Pulling trailer, all open highway,16.5mpg.
 
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bluewater19

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Re: Chevy 4.8L

tilliam we,<br />You are right on, <br /> I should have said LS-1 5.7 <br />These motors are great. And keeping with gm tradition alot of the parts interchange. Put a set of ported 5.3 or 6.0 heads on a LS-1 and holy cow were back to hot rodding just like the 60's!
 
Bob_VT

Bob_VT

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Re: Chevy 4.8L

TilliamWe... I guess I should have worded that the new motors are the newer generation ones but basically derived from the older ones.<br /><br />Like a family tree. I was trying to keep in in layman terms.<br /><br />I don't feel picked on :) <br /><br />Bob
 
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TilliamWe

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Re: Chevy 4.8L

Bob, almost a big enough branch to make a whole new tree. <br />The main differences between the new engines & the small blocks of old are:<br />1) Deep skirt block vs short skirt block<br />2) 8 headbolts ( I think it's only 8) vs 12 check those numbers please<br />3) Valve arrangement (IEIEIEIE vs IEIEEIEI)<br />4) Distributerless individual coil ignition<br /><br />The main similiarities are:<br />1) 4.4 inch bore center spacing<br />2) OHV cam-in-block pushrod valve train<br />3) GM makes them
 
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