Question about 1.8 roller rockers
Question about 1.8 roller rockers Currently my car has patriot stage one heads, gm hotcam, and full bolt on (I didn't pick the cam, I bought the car this way). My question is, if I add 1.8 roller rockers my understanding is it will increase the lift. Will this free up horsepower/ how much, will it need to be returned, do I need better springs (have LS6 currently), and which roller rockers offer good longevity?
Thanks
Thanks
Currently my car has patriot stage one heads, gm hotcam, and full bolt on (I didn't pick the cam, I bought the car this way). My question is, if I add 1.8 roller rockers my understanding is it will increase the lift. Will this free up horsepower/ how much, will it need to be returned, do I need better springs (have LS6 currently), and which roller rockers offer good longevity?
Thanks
Thanks
Yes you will need better springs. Lift is one part of the equation, but also the roller tips will be heavier over the valve, so you'll need a better spring to compensate. The easy thing is to throw in a set of BTR dual plats. That's kind of the go to for a milder build.
There are lots of rollers with good longevity. Best combination of price performance and durability right now is probably TSP.
You need to check coil bind and are the heads machined so that the retainer does not crash into the valve seal. New springs a good idea. Not sure what lift you are going from and too you may be fine but check anyway.
I use the Comp Cams Ultra Pro-magnums. You'll need spacers for the valve covers to clear the 1.8's.
KW
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Joined: Jun 2016
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From: Central Cal.
I'm using those rockers too, no spacers needed with stock valve covers. I've got the non-adjustable ones though, if you get the individually adjustable ones they probably stick up higher.
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Teching In
Joined: Feb 2020
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From: Goshen
I have a somewhat similar question, if any of y’all can help me make sure I’m getting my math right. I’ve been slowly collecting parts here and there for a build as funds were available. Picked up a set of 1.82 rockers a little over a year ago, and recently got a cam off a buddy of mine when he decided to go with a turbo. Cam has .600 lift. Had some 862 heads machined by prc/Texas speed, and I went ahead and picked up their dual spring coils. Coil bind was listed at 1.015”, so the 1.82 rockers would bottom those out right? Even 1.7 ratio would be 0.005 past the bind limit, so I would need something 1.6:1 or less correct?
Been trying to chase down a decent answer all week, wanted to make sure I was squared away before I put it all together and learned a lesson the hard way.
Been trying to chase down a decent answer all week, wanted to make sure I was squared away before I put it all together and learned a lesson the hard way.
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Verdad Gallardo I have a somewhat similar question, if any of y’all can help me make sure I’m getting my math right. I’ve been slowly collecting parts here and there for a build as funds were available. Picked up a set of 1.82 rockers a little over a year ago, and recently got a cam off a buddy of mine when he decided to go with a turbo. Cam has .600 lift. Had some 862 heads machined by prc/Texas speed, and I went ahead and picked up their dual spring coils. Coil bind was listed at 1.015”, so the 1.82 rockers would bottom those out right? Even 1.7 ratio would be 0.005 past the bind limit, so I would need something 1.6:1 or less correct?
Been trying to chase down a decent answer all week, wanted to make sure I was squared away before I put it all together and learned a lesson the hard way.
Been trying to chase down a decent answer all week, wanted to make sure I was squared away before I put it all together and learned a lesson the hard way.
Unless your installed height is really low, like at 1.600
Teching In
Joined: Feb 2020
Posts: 6
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From: Goshen
Not being a jerk, trying to be clear.... the CAM LOBE has .600 lift??? Or the total valve lift is .600? Most of the time, it's the valve lift, so with the ratio figured in, the actual lobe lift is .353. In which case with your 18.2's, the gross lift would be 642, so nowhere near coil bind.
Unless your installed height is really low, like at 1.600
Unless your installed height is really low, like at 1.600
spring install height is 1.810”
closed spring pressure 160lb at 1.810”
open spring pressure 415lb at .660”
OK, that's gross valve lift. So that .600 number already includes the rocker ratio. If you jump to 1.82, your lift will go to .640 range. Will be fine.
Teching In
Joined: Feb 2020
Posts: 6
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From: Goshen
ive had major issues with valve float in the last year, ive had two do lifters twice and lost a cam because of it. i dont know everything but i try to share my experiences/knowledge because id hate to see someone else have to go through the same thing. my recommendation would be to run stock rockers with a trunion upgrade. Or if you really want to run the roller rockers change springs. i was running those exact springs with a 1.7 yella terra roller rocker and had major float at 6500. after doing some home work on here it was apparent i wasnt the only one running into this problem running roller rockers. i swapped out the yella terras for a bone stock set of stock rockers and it extended my rpm range, however it never completely eliminated the float just moved it to a higher rpm but any float is not good and the valves ended up hitting the pistons somewhere around 7300, bending a pushrod and collapsing a lifter. when i had a stock ls6 cam i ran yella terra 1.8 roller rockers and pac 1211x springs, it valved floated on me around 7000 one night and developed a very minor tick, 2 weeks later the cam and 2 lifters were wiped out. this time im not playing around, i have a set of pac 1208x springs waiting to go in. theyre kinda overboard but i cant take a chance of this happening again.
Teching In
Joined: Feb 2020
Posts: 6
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From: Goshen
Man that sounds like a kick in the nuts... I picked up this block practically bare, been piecing it together with parts as I go. Got tempted by the shine things 😅
But based on your story and others I’ve been hearing, looks like I’m going to have to try and offload these rockers. Not even sure what the stock ratio was for a 2000 Silverado 1500... but to be on the safe side I think I’ll look into some 1.5 rockers and go from there. At this point I just want her to run reliably, and not kick the bucket within the first year 🤷🏻♂️
But based on your story and others I’ve been hearing, looks like I’m going to have to try and offload these rockers. Not even sure what the stock ratio was for a 2000 Silverado 1500... but to be on the safe side I think I’ll look into some 1.5 rockers and go from there. At this point I just want her to run reliably, and not kick the bucket within the first year 🤷🏻♂️
Man that sounds like a kick in the nuts... I picked up this block practically bare, been piecing it together with parts as I go. Got tempted by the shine things 😅
But based on your story and others I’ve been hearing, looks like I’m going to have to try and offload these rockers. Not even sure what the stock ratio was for a 2000 Silverado 1500... but to be on the safe side I think I’ll look into some 1.5 rockers and go from there. At this point I just want her to run reliably, and not kick the bucket within the first year 🤷🏻♂️
But based on your story and others I’ve been hearing, looks like I’m going to have to try and offload these rockers. Not even sure what the stock ratio was for a 2000 Silverado 1500... but to be on the safe side I think I’ll look into some 1.5 rockers and go from there. At this point I just want her to run reliably, and not kick the bucket within the first year 🤷🏻♂️
In a grossly overgeneralized definition, I would say how quickly the lobe goes from 0 tappet lift to full lift and then back to 0.
Comp publishes their lobe master catalog for guys like us to be able to better choose a camshaft. I planned on using heavy springs, valves, and rockers which carry a lot of inertia. So I chose lobe from Comp’s catalog which were meant for heavy valvetrain components at sustained RPM (ex: offshore marine applications).
Comp publishes their lobe master catalog for guys like us to be able to better choose a camshaft. I planned on using heavy springs, valves, and rockers which carry a lot of inertia. So I chose lobe from Comp’s catalog which were meant for heavy valvetrain components at sustained RPM (ex: offshore marine applications).