1.7 Roller Rockers
07-13-2009, 02:33 AM
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1.7 Roller Rockers So I have a set of 1.6 roller rockers I was going to install, but I found a REALLY good deal on a set of 1.7 roller rockers - will these fit under the stock valve covers?
Here are the roller rockers in question - I also noticed it says for Chevy Small Blocks 265-400, is that right for the LT1?
http://cow95.rhqu4.servertrust.com/p..._p/scp1025.htm
I was going to be putting in a CC503 and Crane Valve Springs too.
Here are the roller rockers in question - I also noticed it says for Chevy Small Blocks 265-400, is that right for the LT1?
http://cow95.rhqu4.servertrust.com/p..._p/scp1025.htm
I was going to be putting in a CC503 and Crane Valve Springs too.
Last edited by Counted Out; 07-13-2009 at 03:13 AM.
07-13-2009, 06:02 PM
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Best thing to do is: if he will do it. Take one of his 1.7's off and put it on your car and see how far it travels at max lift. Some times the rr will travel to far off the push rod and can cause damage, once it slipped off. And just remember that with NSA you will need to buy guide plates to make sure they stay aligned.
07-13-2009, 06:38 PM
#7
Best thing to do is: if he will do it. Take one of his 1.7's off and put it on your car and see how far it travels at max lift. Some times the rr will travel to far off the push rod and can cause damage, once it slipped off. And just remember that with NSA you will need to buy guide plates to make sure they stay aligned.
well, we cant exactly do that cuz hes in arizona and im in north carolina lol
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07-13-2009, 06:47 PM
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Best thing to do is: if he will do it. Take one of his 1.7's off and put it on your car and see how far it travels at max lift. Some times the rr will travel to far off the push rod and can cause damage, once it slipped off. And just remember that with NSA you will need to buy guide plates to make sure they stay aligned.
What makes me nervous is the 1.6's say this:
Chevrolet V-8 305-350
Self Aligning 3/8 Vortec
Self Aligning 3/8 Vortec
Chevy V-8 265-400
Small Block Chevy
Small Block Chevy
07-14-2009, 04:31 PM
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Cost. yes the 1.7's cost about the same as 1.6's. But the springs to handle the extra lift is another story. Its been a rule of thumb to have .025 more lift in a spring (over max lift) as a safety buffer. Most people think of running 918's when they do a cam swap. That give you .600 lift take away .025 and you have .575.
Plus the 1.7rr is starting to catch on with the LT1. With LSX tech getting better, and time passing, more and more parts are found to be interchangable with little or no modifications. Look back at springs before the LSX motor debuted. A spring that could handle .600 was a pricey thing (and considered High Performance part). And since the LTX platform is a Gen 2 motor, and it wasnt around long enough and people didnt have time to see what would work. LSX came along with its .600+ lift cams, meant supply and demand came into effect. Causing prices to go down and high spring rates to emerge.
It used to be something back in the day for a DD car to have over .600 lift with 1.6rr. Now it is a common thing. I mean 1.8's are common on an LS1. Just waiting for someone to mount some of these on an LT1.
07-14-2009, 05:10 PM
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So it wouldn't be safe to run the CC503 and Crane Dual Springs?
If I know the lift on 1.5 Roller Rockers, how do I find out the lift on 1.7's?
I think ss.slp.ls1 did the math for the CC503 for me, but I'm curious to how to get those numbers.
If I know the lift on 1.5 Roller Rockers, how do I find out the lift on 1.7's?
I think ss.slp.ls1 did the math for the CC503 for me, but I'm curious to how to get those numbers.
07-14-2009, 05:14 PM
#16
Divide the lift by 1.5 and multiply by 1.7, that's it.
.503/1.5*1.7 = ~.570
.510/1.5*1.7 = .578
Also many times you will get the lobe lift spec along with you advertised cam specs. The lobe lift for the CC503 is .335/.340. Just multiply those lifts by whatever ratio rocker you are using to get max lift.
So the lift with 1.7 rr's would be ~.570/.578
07-15-2009, 07:55 PM
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This all sounds great, but why not just go with a bigger cam if your searching for more lift? I could understand this if you were stock or pushing shelf cams, but most of us that are this worried are running custom cams right?
07-15-2009, 08:12 PM
#18
Nobody answered my question though.. Why havent many people gone with 1.7 rockers. They have to be worth some kind of power? They take the stock cam from .450 to .510 compared to .480 with 1.6's. Anybody run these on a bolton car?
