LS2 valve clearance question.. and other ones as well.
02-09-2006, 12:53 PM
#1
LS2 valve clearance question.. and other ones as well. Thanks in advance for any thoughts on this.
I am building an LS2 crate motor for my '68. Haven't worked with an LS2 before but I assume most of what holds true for an LS1 works for an LS2 as well.
I was Westech and they had a concern about valve clearance in my proposed combo. I really didn't think the cam I chose would be a problem but I thought I would toss on here to see what you guys thought.
What I am running:
Stock LS2 crate motor
COMP 230/232 .588/.595 114+2 camshaft
AFR 225cc LS1 Cylinder Heads with 72cc chamber assembled with 2.08" / 1.60" Valves, dual coil valve springs(.600" max lift), and Titanium retainers.
FAST intake and the vette 90mm flybywire TB. Oh, and I have some custom stepped long tube headers.
Anyone see any problems with this combo? Keep in mind this is not a drag car but more of a road race deal so I need good mid and low end power.
Also, what size are stock LS2 injectors? (28lbs?) and do you think they are large enough to get the job done.
I appreciate any input. Thanks!
Oh, anyone have any experience with these COMP rockers? They want me to run them..
Comp Cams LS1 Pro-Magnum Rocker Arm Kit, 5/16" guide plates, 1.85 ratio (Kit includes rocker arms, 5/16" flat guide plates, rocker arm studs & poly-locks)
I am building an LS2 crate motor for my '68. Haven't worked with an LS2 before but I assume most of what holds true for an LS1 works for an LS2 as well.
I was Westech and they had a concern about valve clearance in my proposed combo. I really didn't think the cam I chose would be a problem but I thought I would toss on here to see what you guys thought.
What I am running:
Stock LS2 crate motor
COMP 230/232 .588/.595 114+2 camshaft
AFR 225cc LS1 Cylinder Heads with 72cc chamber assembled with 2.08" / 1.60" Valves, dual coil valve springs(.600" max lift), and Titanium retainers.
FAST intake and the vette 90mm flybywire TB. Oh, and I have some custom stepped long tube headers.
Anyone see any problems with this combo? Keep in mind this is not a drag car but more of a road race deal so I need good mid and low end power.
Also, what size are stock LS2 injectors? (28lbs?) and do you think they are large enough to get the job done.
I appreciate any input. Thanks!
Oh, anyone have any experience with these COMP rockers? They want me to run them..
Comp Cams LS1 Pro-Magnum Rocker Arm Kit, 5/16" guide plates, 1.85 ratio (Kit includes rocker arms, 5/16" flat guide plates, rocker arm studs & poly-locks)
02-09-2006, 01:55 PM
#2
I have personal seen that a MTI X1 cam (230 227 112lsa) has some P to V clearance problems.
A friend of mine had the X1 cam in his vette and wanted me to pull the cam out of his short block so he could sell it. (He got a MTI 427 installed)
I noticed that all 8 cyl had very faint lines that you could just feel with your finger nail where all the intake valve locations were.
Just my opinion, I'd go with a 228 230 114+2 cam, should be good for some low and mid power.
I believe they do come with 28lb injectors, might want to go up a size, SVO 30lb?
Some people have problems with 1.8 or 1.85 rockers with certain cams, I think it has something to do with ramp rates.
A friend of mine had the X1 cam in his vette and wanted me to pull the cam out of his short block so he could sell it. (He got a MTI 427 installed)
I noticed that all 8 cyl had very faint lines that you could just feel with your finger nail where all the intake valve locations were.
Just my opinion, I'd go with a 228 230 114+2 cam, should be good for some low and mid power.
I believe they do come with 28lb injectors, might want to go up a size, SVO 30lb?
Some people have problems with 1.8 or 1.85 rockers with certain cams, I think it has something to do with ramp rates.
02-09-2006, 02:04 PM
#3
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Such low compression?
I don't think you;ll have problems, but Westech should be plenty capable of checking just in case. And you'll be past the "max lift" on those springs with those rockers.
I don't think you;ll have problems, but Westech should be plenty capable of checking just in case. And you'll be past the "max lift" on those springs with those rockers.
02-09-2006, 09:43 PM
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I do believe Comp recommends 1.75 rockers with any of there cam's that are over the 230 range.
You could go with a 224 size cam and use the 1.85 rocker's or you can go with a 230 and 1.75's the max lift will be about the same (thats the point of longer rocker arms you use a smaller cam to get the same amount of lift on the valve).
You could go with a 224 size cam and use the 1.85 rocker's or you can go with a 230 and 1.75's the max lift will be about the same (thats the point of longer rocker arms you use a smaller cam to get the same amount of lift on the valve).
02-09-2006, 09:51 PM
#6
Originally Posted by Bring the Noise
I do believe Comp recommends 1.75 rockers with any of there cam's that are over the 230 range.
You could go with a 224 size cam and use the 1.85 rocker's or you can go with a 230 and 1.75's the max lift will be about the same (thats the point of longer rocker arms you use a smaller cam to get the same amount of lift on the valve).
You could go with a 224 size cam and use the 1.85 rocker's or you can go with a 230 and 1.75's the max lift will be about the same (thats the point of longer rocker arms you use a smaller cam to get the same amount of lift on the valve).
I will find out more tomorrow.. maybe the cam was ground for 1.85 rockers..
02-10-2006, 11:45 PM
#7
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Of course Comp wants you to buy rockers. I'd stick with stock ones or go straight to Jesels. I was saying that the rockers will increase lift past your '.600" max-lift' springs.
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02-14-2006, 10:57 AM
#8
Originally Posted by RyanJ
Of course Comp wants you to buy rockers. I'd stick with stock ones or go straight to Jesels. I was saying that the rockers will increase lift past your '.600" max-lift' springs.
1.75's would put me just over .600 (.614 and .609 I believe)..
