Will 1.6RR's benifit my stock '97 LT1?
05-04-2006, 04:47 PM
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Will 1.6RR's benifit my stock '97 LT1? Out of curiosity, will 1.6 roller rockers benefit my stock LT1 with only exhaust-work done? How much gains will I get with them? I don't plan on doing this, but I'm just curious. Thanks guys.
05-04-2006, 05:17 PM
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Originally Posted by lt1 97 formula
1.6 rrs will increase your lift but you should do springs when you put on 1.6rrs. I have heard that 1.6rrs are good for around 10-15 rwhp? someone correct me if im wrong
exactly what I understood from what I've been reading, but I'm new to this and would like to know the answer in detail.
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05-04-2006, 06:51 PM
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from what i hear, the LT4 hotcam is not a good choice for stock heads. however, i am hazy in this field of knowlege so i may be wrong. so with 1.6's there is a significant increase in power? can anyone clarify this?
05-04-2006, 07:36 PM
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the LT4 hotam is fine for stock heads. if anything it's quite an old grind and pretty much just outdated. you can get much better grinds now. the only thing really going for it is the price and everyone knows about it. don't get my wrong, i have a hotcam, but i got the stupidest deal on it ever, so there was no turning it down.
the rockers don't JUST increase lift. at a certain lift, it actually increases duration. so if your peak flow is at .400" lift then you will be open at or above .400" lift for longer with a 1.6 rocker than a 1.5. i'll see if i can dig up a pic to post in just a second.
pretend the black is the cam lobe itself, purple is a 1.5 rocker, blue is 1.6, and red is 1.7 and that should explain it.
the rockers don't JUST increase lift. at a certain lift, it actually increases duration. so if your peak flow is at .400" lift then you will be open at or above .400" lift for longer with a 1.6 rocker than a 1.5. i'll see if i can dig up a pic to post in just a second.
pretend the black is the cam lobe itself, purple is a 1.5 rocker, blue is 1.6, and red is 1.7 and that should explain it.
Last edited by RoAdRaGe912; 05-04-2006 at 07:52 PM.
05-04-2006, 08:44 PM
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Originally Posted by RoAdRaGe912
the LT4 hotam is fine for stock heads. if anything it's quite an old grind and pretty much just outdated. you can get much better grinds now. the only thing really going for it is the price and everyone knows about it. don't get my wrong, i have a hotcam, but i got the stupidest deal on it ever, so there was no turning it down.
the rockers don't JUST increase lift. at a certain lift, it actually increases duration. so if your peak flow is at .400" lift then you will be open at or above .400" lift for longer with a 1.6 rocker than a 1.5. i'll see if i can dig up a pic to post in just a second.
pretend the black is the cam lobe itself, purple is a 1.5 rocker, blue is 1.6, and red is 1.7 and that should explain it.
the rockers don't JUST increase lift. at a certain lift, it actually increases duration. so if your peak flow is at .400" lift then you will be open at or above .400" lift for longer with a 1.6 rocker than a 1.5. i'll see if i can dig up a pic to post in just a second.
pretend the black is the cam lobe itself, purple is a 1.5 rocker, blue is 1.6, and red is 1.7 and that should explain it.
05-04-2006, 09:38 PM
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Originally Posted by urbanhunter44
from what ive seen in dyno sheets it's about 10-15 rwhp.
05-04-2006, 09:56 PM
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Originally Posted by zlover129
It doesnt increase duration, just lift, the ramp rate is increased though so it reaches the higher lift in the same duration, your illustration even proves that it doesnt increase duration
As you state, the ramp rate is effectively increased, so the valve will hit any specific lift value (say .050") slightly quicker, and hold it for slightly longer...ie. more duration.
05-04-2006, 10:05 PM
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I like CompCams ProMagnums, although there are a number of quality options on the market. Just about any performance parts distributor will have them...ex. Summit, Jegs, etc.
Oh yeah...your stock rockers are self-aligning, so unless you are going to install guideplates and hardened pushrods, make sure you pick up SA rockers.
Stock stud size is 3/8".
If you go with aluminum body rockers, make sure to look for a narrow-body design, or you'll have trouble getting them under center-bolt valve covers.
Be aware that you'll likely have to grind down the driptabs on the valve covers a bit to clear the rockers.
Oh yeah...your stock rockers are self-aligning, so unless you are going to install guideplates and hardened pushrods, make sure you pick up SA rockers.
Stock stud size is 3/8".
If you go with aluminum body rockers, make sure to look for a narrow-body design, or you'll have trouble getting them under center-bolt valve covers.
Be aware that you'll likely have to grind down the driptabs on the valve covers a bit to clear the rockers.
05-05-2006, 05:54 AM
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Originally Posted by 95PoloVert
Actually it does increase duration slightly at any given lift.
As you state, the ramp rate is effectively increased, so the valve will hit any specific lift value (say .050") slightly quicker, and hold it for slightly longer...ie. more duration.
As you state, the ramp rate is effectively increased, so the valve will hit any specific lift value (say .050") slightly quicker, and hold it for slightly longer...ie. more duration.