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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 02-14-2006, 04:52 PM   #1
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Default LN3 with aftermarket rockers

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I have been seriously considering the 1.72 roller rockers on seriesoneperformance and look forward to the gains, but is there any other rockers for the LN3/series one.

what gains will I see from these rockers. I am just looking for more info on this modification.

I know a cam would be a great mod but it is much more work and if I do decide to purchase a cam and install it the rockers will be that much greater.
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Old 02-15-2006, 11:58 PM   #2
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anyone? lol
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Old 02-23-2006, 05:55 PM   #3
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series one performance offers 1.8 ratio rockers (soon) will valve spring need to be changed? or will the stock spring be alright?
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Old 02-24-2006, 12:46 PM   #4
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Quote:
Originally Posted by maybe2fast
series one performance offers 1.8 ratio rockers (soon) will valve spring need to be changed? or will the stock spring be alright?
Not 100% sure... I think on the 3800 Series one engines the springs are 105-110Lb springs... But maybe a better spring for the increase in lift would be a decent idea?

I think we are .250 intake and .255 exahust for the cam... So totall lift with 1.8'* would be...

.450 Intake and .459 Exahust... Hmmm seems interesting to me as well, especially if they work with no issues on the LN3 heads....

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Old 02-27-2006, 09:28 PM   #5
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I am thinking the 1.72s might be the best without head work...

I am just not sure which ones to choose
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Old 02-28-2006, 02:04 AM   #6
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I'm not very familar with the S1 but I'm guessing there are quite a few miles on that motor so new springs would be a smart idea while you are there.
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Old 02-28-2006, 12:57 PM   #7
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can springs be done under the valve cover? if so I will for sure do new valve springs and the 1.8s

fill the cylinders with compressed air to stop the valve from falling into the cylinder.
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Old 02-28-2006, 04:24 PM   #8
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How many miles are on your engine? If mileage is on the high side, I'd replace then with stockers as long as 1.8'* don't make create coil bind with stockers. IIRC Series 1 springs are 80 lb. seat pressure @ 1.75 and a spring rate of 210 lb. @ 1.315.

If you are going to change springs I'd also do valve seals since you are already in their.
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Old 02-28-2006, 07:18 PM   #9
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well the motor has 154,xxx and runs great

you don't think the 135# would be better with bigger duration? will they hurt the motor with the added stiffness?
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Old 02-28-2006, 07:40 PM   #10
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Quote:
Originally Posted by maybe2fast
well the motor has 154,xxx and runs great

you don't think the 135# would be better with bigger duration? will they hurt the motor with the added stiffness?
135# springs will put alot of wear on your timing chain and tensioner. If your going to put stiffer springs in you should really replace the chain & tensioner because of your mileage.
If stock is 80#* are stock and your going w/ 1.8'* I would try new 90# or 105# springs.
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