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Old 02-23-2018, 05:31 PM   #1
Dragsinger
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Default Education, Chevrolet LS engine mechanical roller valve train

Racers,

Help me begin my education of the LS engines mechanical roller valve train.

Questions:

*considering the LS3/L92 rectangular-port head.What is required for valve springs and rockers to accommodate adjustable rockers and .750" range lift?

*This engine will spin in the 7800 RPM range and make around 700 horse. It will be carburated with a powerglide, dedicated, trailered, serious drag race package.

I am not interested in a non-adjustable, hydraulic valve train.
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Old 02-24-2018, 01:30 AM   #2
Dragsinger
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Default Re: Education, Chevrolet LS engine mechanical roller valve t

For future reference, the LS series has many options and all the parts and modifications we are accustomed to with the generation 1 SBC are also available for the LS series. Mechanical, link bar roller lifters, adjustable & shaft rockers, valve springs to accommodate.750" lift. Also, Brodix, Dart, and GM offer a number of race head packages.
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Old 02-25-2018, 09:16 AM   #3
rx dealer
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Default Re: Education, Chevrolet LS engine mechanical roller valve t

The block must have the lifter bores bushed to help control the oil flow to the top of the valve train. If you don't you will flood the top end of the engine. The valve springs are critical. I went from having a "recommended" valve spring #860 open to a weaker valve spring that is #90 less. The heavy spring was making the valve to bounce after closing. I spent the extra money to put these parts on a spintron and that was my proof. Rocker shaft is a must ( Jesel / T&D ). Luke

Last edited by rx dealer; 02-25-2018 at 09:18 AM.
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Old 02-25-2018, 07:44 PM   #4
L79racer
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Default Re: Education, Chevrolet LS engine mechanical roller valve t

Im running a LS3 based 418. Stock block and sleeves. Trick flow genx 255 heads by TEA. low lash solid roller by cam motion. morel lifters, jesel shaft rockers. pac 1238X springs, manton push rods. I have not bushed the lifter bores. Running a glide with it. Shifting 8000. Making over 700 hp.
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Old 02-25-2018, 07:49 PM   #5
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Default Re: Education, Chevrolet LS engine mechanical roller valve t

L79, you are in the area of what I have in mind. Thanks for the note
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Old 02-26-2018, 12:59 PM   #6
JRyan
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Default Re: Education, Chevrolet LS engine mechanical roller valve t

That's a pretty good street/strip set up that L79 racer is using. Should be very low maintenance a shouldn't break the budget. The LS platform is such a great platform to work with. Decent springs, good lifters and a nice cam profile they'll turn 7500 with stock rotating assembly's.

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