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LSX-LS7 boosted springs ?

   
Old Nov 19, 2010 | 12:54 AM
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Default LSX-LS7 boosted springs ?
I have the LSX-LS7 gmpp heads ti intake sd ex on a 427 LSX boosted never ran yet so not sure on boost psi, as im wanting diff springs than the ones the heads come with, pockets are big enough for 1.55" what would be the best spring for this combo be, cam is a TS ls7 grind .656" lift
hyd caddy lifters if i remember
F1 procharger 15-18 psi
Attached Thumbnails LSX-LS7 boosted springs ?-img_0068.jpg   LSX-LS7 boosted springs ?-img_0066.jpg  
Last edited by SSLSX427; Nov 19, 2010 at 05:55 PM.
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Old Nov 19, 2010 | 08:48 AM
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I wonder how will the sodium filled exhaust valves will hold up?
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Old Nov 19, 2010 | 10:15 AM
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What rpm range are you shooting for? Anything over 7500 I would suggest going to either a solid lifter or low pump hydraulic that can handle over 500lbs of pressure.

As of now i would suggest either the pac 1294 or the pac 1371.
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Old Nov 19, 2010 | 05:49 PM
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Originally Posted by Kx69
I wonder how will the sodium filled exhaust valves will hold up?
I think I will replace them with manley extreme SS
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Old Nov 19, 2010 | 05:52 PM
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Originally Posted by TurboBuick6
What rpm range are you shooting for? Anything over 7500 I would suggest going to either a solid lifter or low pump hydraulic that can handle over 500lbs of pressure.

As of now i would suggest either the pac 1294 or the pac 1371.
7000 7200 whats a low pump hydraulic ? who makes them ?
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Old Nov 19, 2010 | 05:56 PM
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added a couple pics
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Old Nov 19, 2010 | 08:15 PM
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Morel makes them. They have a shorter stiffer spring so they will not bleed down like a street lifter. A little more money but it would be worth it for you to be able to run higher pressures.

I brain fart a few hundred times a day and can't remember the correct term but someone will chime in and correct me.
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Old Nov 19, 2010 | 08:54 PM
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Originally Posted by TurboBuick6
Morel makes them. They have a shorter stiffer spring so they will not bleed down like a street lifter. A little more money but it would be worth it for you to be able to run higher pressures.

I brain fart a few hundred times a day and can't remember the correct term but someone will chime in and correct me.
i know how you feel on the brain farts lol

thanks man
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Old Nov 19, 2010 | 10:36 PM
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From the photos it appears that the spring retainers are a different distance from the valve stem tips on the intakes vs exhausts??
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Old Nov 19, 2010 | 10:42 PM
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Originally Posted by DrX
From the photos it appears that the spring retainers are a different distance from the valve stem tips on the intakes vs exhausts??
yes the intakes are titanium so the lash cap is off they are same length inst hieght

what rockers are you using ?

gona get the t&d shaft rocker set i think
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Old Nov 19, 2010 | 10:56 PM
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Originally Posted by SSLSX427
yes the intakes are titanium so the lash cap is off they are same length inst hieght

what rockers are you using ?

gona get the t&d shaft rocker set i think
Crower stainless shaft mounts.

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Old Nov 19, 2010 | 11:00 PM
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are those ls7 offset ?
whats the cost on those ? i didnt even know crower was making any ls7 rockers
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Old Nov 19, 2010 | 11:19 PM
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LS7-ETP $1284 on their site. Not sure about anything for the GM heads.
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Old Nov 20, 2010 | 07:17 PM
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Crower is the way to go! I bet 95% of the people on here don’t know they exist. Personally, I would never go back to an aluminum rocker but that’s just me.
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Old Nov 20, 2010 | 07:30 PM
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Originally Posted by Kx69
Crower is the way to go! I bet 95% of the people on here don’t know they exist. Personally, I would never go back to an aluminum rocker but that’s just me.
I see crower has them now pn 74107 for stock ls7 which is what the LSX LS7 heads use "nice"
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Old Nov 20, 2010 | 07:35 PM
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They are very, very nice. There is not as much weight over the valve stem as you would think for a steel rocker, yet they as close to indestructible as you can get.
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Old Dec 31, 2010 | 12:18 PM
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Originally Posted by Kx69
They are very, very nice. There is not as much weight over the valve stem as you would think for a steel rocker, yet they as close to indestructible as you can get.
i ordered a set of the crowers they are nice didn't know they made for the LS7, i always have been a fan of the SS rocker as they are way stronger , last longer almost forever, and i bet they weigh less over the valve
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