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Subject: 454 LSF vs LS6

Original Message
Name: dan oneill
Date: November 26, 1997 at 11:09:16
Subject: 454 LSF vs LS6
Comment:
70 LS6 versus LS5, whats the diff., and which one is better; thanks dan

Response Number 1
Name: Rich
Date: November 26, 1997 at 13:53:47
Subject: 454 LSF vs LS6
Reply:
The ls5 is a, if I can remember right, a 390 hp big block. It has a hydraulic cam, oval port heads,& about 9:1 compression. i can't remeber off hand if it has a steel crank or not, but i think it is a 4-bolt block.
The ls6 has a solid lifter cam, large rectangle port heads, 11:1 compression(10.25:1 in 1971), a steel crank, 4-bolt main, 7/16" rod bolts, forged pistons,&, a 450hp output rating(425hp in 1971).
The ls6 packs more punch & reliability than the ls5 but it also comes with it's share of headaches. unless you have 4.11:1 rearend gear ratio, it drives with a soggy feeling on the bottom end. so you'll need at least a 2500 stall converter. it is also a real pain in the butt to make anything hook up decently w/out breaking anything.But it does make for one hellacious power plant.
I currently have an ls6 in my 63 chevy pickup. It won't hook up for anything but it hauls ass and does killer burnouts. hope this helps.

Response Number 2
Name: Rich
Date: November 26, 1997 at 14:00:51
Subject: 454 LSF vs LS6
Reply:
The ls5 is a, if I can remember right, a 390 hp big block. It has a hydraulic cam, oval port heads,& about 9:1 compression. i can't remeber off hand if it has a steel crank or not, but i think it is a 4-bolt block.
The ls6 has a solid lifter cam, large rectangle port heads, 11:1 compression(10.25:1 in 1971), a steel crank, 4-bolt main, 7/16" rod bolts, forged pistons,&, a 450hp output rating(425hp in 1971).
The ls6 packs more punch & reliability than the ls5 but it also comes with it's share of headaches. unless you have 4.11:1 rearend gear ratio, it drives with a soggy feeling on the bottom end. so you'll need at least a 2500 stall converter. it is also a real pain in the butt to make anything hook up decently w/out breaking anything.But it does make for one hellacious power plant.
I currently have an ls6 in my 63 chevy pickup. It won't hook up for anything but it hauls ass and does killer burnouts. hope this helps.

Response Number 3
Name: M. Jones
Date: November 26, 1997 at 19:27:51
Subject: 454 LS5 vs LS6
Reply:
1970: LS5 was 454/360 hp 2 bolt main with forged steel crank. Heads had 2.06/1.72 valves 100 cc.
Cast iron intake with a Rochester 4BBL
1970: LS6 was 454/450 hp considered by many to be the alltime most powerful Chevrolet engine available to the general public. 4 bolt main with forged steel crank. Heads had 2.19/1.88 valves 109 cc. Aluminum Intake with Holley 4BBL
Both had cast iron Heads
1971: LS5 454/365hp same as above

1971: LS6 454/425hp same as above slightly different heads 118 cc

1972: LS5 454/270hp

1972: LS6 none

Hope I didn't miss anything.
In the case of which one is better, I'd take the LS6. But both are great engines in my opinion.


Response Number 4
Name: alanf
Date: November 27, 1997 at 10:13:27
Subject: 454 LSF vs LS6
Reply:
Dan,

Which is better depends upon an individual's unique needs. If one wants the most total horsepower and torque which includes heavier duty parts to support it, an LS6 is the obvious choice.

However, for everyday streetability, an LS5 is a very potent performer. The LS5 has hydraulic valve lifters (vs mechanical for the LS6) and oval port heads (vs larger rectangular ports)which yields better low-speed (RPM) responsiveness. The LS6 makes its power in a higher RPM band.

In terms of rareness, there were fewer LS5 Chevelles/El Caminos than the LS6 counterpart.

I hope you find this usefull.


Response Number 5
Name: alanf
Date: November 27, 1997 at 10:17:19
Subject: 454 LSF vs LS6
Reply:
AAAGGGHH! Sorry, s/b "useful".

Response Number 6
Name: John Mozingo
Date: December 20, 1997 at 21:05:02
Subject: 454 LSF vs LS6
Reply:
I'm currently looking at a 1970 Chevelle SS454 for sale at a car lot. I only got a brief look at it. It seems to have a new engine,3 speed automatic, fairly new black paint w/white stripe, new tires and Crager s/s wheels all the way around. Looks clean from the outside.Started it up and it sounded quiet and smooth. Sounded like a new motor. Interior was original and needed replacing. He wanted $4,000 cash for it. What would be an easy way to tell if it has the original motor and is it worth $4000.00 like it's sitting? I see $3,000 to 5,000 more to go to make it sweet. Anybody can help me, I'll appreciate it. John j1340@flash.net

Response Number 7
Name:
Date: May 28, 1998 at 10:04:24
Subject: 454 LSF vs LS6
Reply:
The LS6 Is a 454CI engine with a factory rating of 450HP. It has 11.25 to 1 compression with a radical cam and mechanical lifters. It's a 4 bolt main with a forged and nitrided crank. The pistons and rods are also forged. This is one of the meanest factory engines of all time but neads a different intake manifold for it to truly perform. The LS5 is a 454 and came with a rating of 390HP or 360 HP. Some where 4bolt, some where 2bolt. The crank and pistons where cast.

Response Number 8
Name: L89
Date: May 29, 1998 at 18:48:33
Subject: 454 LSF vs LS6
Reply:
LS-5 1970 454CI, 360HP or 390HP, 4 or 2 bolt
main block, steel crank, cast pistons and rods,
hydraulic cam, cast iron low-rise intake,
10.25-1 compression, Rochester Quadrajet, closed
chamber oval port heads

LS6 1970 454CI 450HP+ 4 bolt main block,
forged nitrited crank, forged 7/16 rods, closed
chamber rectangular port heads, mechanical cam,
aluminum low-riser intake, Holley 4 barrel
800CFM, 11.25-1 com


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