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ls 1.8 rocker arms #5320205 01/11/20 07:55 PM
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spasm3 Online Happy OP
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Any one tried 1.8 rockers over the stock 1.7 on a stock LS? If so, did you have to run different pushrods? And was/is valve spring coil bind an issue on an otherwise stock cam/engine.

Curious about this on LM7 in my avalanche.


13 elantra 81k 5w30 synpwr
03 chevy avalanche 83k synpwr 5w30
17 mazda cx-5 17000 miles synpwr 5w30
Re: ls 1.8 rocker arms [Re: spasm3] #5320401 01/12/20 01:33 AM
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ls1mike Offline
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Why 1.8s? Are you trying to make more power? I have seen 1.85 make like 15 at the wheels. Not worth it. I think most people upgrade springs when they do it.


Mike
00 Trans Am WS6 5.7 LS1
17 Silverado 3500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT
Re: ls 1.8 rocker arms [Re: spasm3] #5320404 01/12/20 01:48 AM
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Ws6 Offline
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I've never seen it. Noone I know ever did it. Stock arms were fine even in heavily cammed combos.


2019 CX5 Grand Touring Reserve
Re: ls 1.8 rocker arms [Re: ls1mike] #5320538 01/12/20 08:32 AM
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Originally Posted by ls1mike
Why 1.8s? Are you trying to make more power? I have seen 1.85 make like 15 at the wheels. Not worth it. I think most people upgrade springs when they do it.



Yes , wondered now much power it added, without doing a cam swap. It seems GM got most of the low end power with the stock cam. I don't know of cams that improve low end over the stock grind. Upper rpm horse power, yes.

Thanks.


13 elantra 81k 5w30 synpwr
03 chevy avalanche 83k synpwr 5w30
17 mazda cx-5 17000 miles synpwr 5w30
Re: ls 1.8 rocker arms [Re: spasm3] #5320916 01/12/20 04:33 PM
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userfriendly Offline
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To make more power when increasing rocker ratios, retard the cam 2 or 3 crank degrees for each step.
As mentioned, a rocker ratio increase alone makes little, if any increase in power.

Re: ls 1.8 rocker arms [Re: spasm3] #5321213 01/13/20 12:45 AM
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clinebarger Offline
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No replacement for displacement, Throw in a 6.0L & be done with it. The small bore of 4.8L/5.3L blocks really hampers potencial here.

There are some tricks with cam grinds to increase low end power/torque, But the gains are minimal considering the labor & cost.

If you could find a used Magnuson Radix MP112 Supercharger kit.....That would be the easiest/cheapest way to "boost" your trucks power band where you use it most.

Turbos are cool & all, But I've never seen a true Bolt On kit!


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: ls 1.8 rocker arms [Re: clinebarger] #5321218 01/13/20 01:41 AM
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Ws6 Offline
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Originally Posted by clinebarger
No replacement for displacement, Throw in a 6.0L & be done with it. The small bore of 4.8L/5.3L blocks really hampers potencial here.

There are some tricks with cam grinds to increase low end power/torque, But the gains are minimal considering the labor & cost.

If you could find a used Magnuson Radix MP112 Supercharger kit.....That would be the easiest/cheapest way to "boost" your trucks power band where you use it most.

Turbos are cool & all, But I've never seen a true Bolt On kit!

I raced a guy once in a fbody who had a 5.3L with 243 ls1 heads, otherwise stock. I edged him out but it wasnt crazy. Had me a stock ws.6 Ls1 mn6. He blew up his Ls1 and found a Silverado to gank the 5.3 long block from, and swapped heads, is how this came to be. The difference in performance wasnt near as shocking as youd have thought.


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Re: ls 1.8 rocker arms [Re: spasm3] #5322042 01/13/20 09:14 PM
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clinebarger Offline
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You raced a guy once....Okay thumbsup


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: ls 1.8 rocker arms [Re: Ws6] #5322051 01/13/20 09:23 PM
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You can build ‘em lots of ways … one of our engineers tracks a C6 with a built 5.3L aluminum truck motor …

Re: ls 1.8 rocker arms [Re: spasm3] #5322090 01/13/20 10:25 PM
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P10crew Offline
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[Linked Image]
One of my friends texted me this pic Saturday. This is the motor for his new drag GTO.
Zoom in on the CU Inch casting numbers on the front of the block. Lmao

Re: ls 1.8 rocker arms [Re: clinebarger] #5322140 01/14/20 02:30 AM
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Ws6 Offline
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Originally Posted by clinebarger
You raced a guy once....Okay thumbsup


Do you really not just understand that they are all the same thing with a few tweaks and that a few CU really isn't t he limiting factor? What LSX vehicles have YOU owned? Any?

https://www.hotrod.com/articles/surprising-hp-numbers-stock-ls-cylinder-head-test/


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Re: ls 1.8 rocker arms [Re: Ws6] #5322402 01/14/20 12:05 PM
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Originally Posted by Ws6
What LSX vehicles have YOU owned? Any?


Never owned one......


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: ls 1.8 rocker arms [Re: clinebarger] #5322471 01/14/20 01:32 PM
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ls1mike Offline
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Originally Posted by clinebarger
Originally Posted by Ws6
What LSX vehicles have YOU owned? Any?


Never owned one......

HA!


Mike
00 Trans Am WS6 5.7 LS1
17 Silverado 3500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT
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