Questions about larger cams
11 Second Club
Joined: Feb 2003
Posts: 5,524
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From: The South
The S-cam looks very similar to the MS3 based on the numbers @ .05, but a slightly wider LSA (115 vs 113).
There is a decent amount of info available if you search. The X3 will fit under stock heads, even on a 112, but it is close. I believe the X4 will fit on a 114.
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The G5X series cams are all traditional splits.
There is a decent amount of info available if you search. The X3 will fit under stock heads, even on a 112, but it is close. I believe the X4 will fit on a 114.
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The G5X series cams are all traditional splits.
!LS1 11 Second Club
Joined: Apr 2003
Posts: 7,133
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From: Miami
Originally Posted by s346k
i'd be curious to see that powerband on the s-cam, it would probably pull to ~7,000 having a relatively smooth, flat curve.
https://www.horsepowerengineering.co...YNOCAMONLY.jpg
Last edited by SouthFL.02.SS; Jan 9, 2006 at 02:21 PM.
wow, didn't carry like i thought it would. the x3 is similar in size (except the difference in lsa) and it pulls higher than that. hell, even the x3 on 112 dynos i have seen pull higher. eh? s-cam would still be a nice street cam.
Originally Posted by Element
Also, on any of these larger cams - the G5x4, something like that - is flycutting necessary?
i would guess that the x4 would fit without flycutting on any lsa. i think the "base" x4 is on a 111. the t-rex is advertised at 242/248 on a 110, more like 244/249 109 lsa from the cam cards i've seen...so theoretically the x4 would fit with much room to spare.
11 Second Club
Joined: Feb 2003
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From: The South
Originally Posted by s346k
on all the cams i have mentioned - no flycutting is needed with stock heads.
i would guess that the x4 would fit without flycutting on any lsa. i think the "base" x4 is on a 111. the t-rex is advertised at 242/248 on a 110, more like 244/249 109 lsa from the cam cards i've seen...so theoretically the x4 would fit with much room to spare.
i would guess that the x4 would fit without flycutting on any lsa. i think the "base" x4 is on a 111. the t-rex is advertised at 242/248 on a 110, more like 244/249 109 lsa from the cam cards i've seen...so theoretically the x4 would fit with much room to spare.
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Hm...from what you guys have said, I'm pretty much looking at the MTI S and the LG G5x3. Also, might be thinking about the T-Rex - according to TR, valve clearance is only a concern with modified heads - when I get around to heads, I'd have more than enough money to pull the pistons and have the flycut, so that's not a big concern. Right now, I'm pretty much split 50/50 on the T-Rex and the G5x3.
Really, what is the best way to look at a cam and determine if valve clearance is going to be, or could be, an issue?
Really, what is the best way to look at a cam and determine if valve clearance is going to be, or could be, an issue?
Originally Posted by blkZ28spt
The S-cam looks very similar to the MS3 based on the numbers @ .05, but a slightly wider LSA (115 vs 113).
Originally Posted by Element
Hm...from what you guys have said, I'm pretty much looking at the MTI S and the LG G5x3. Also, might be thinking about the T-Rex - according to TR, valve clearance is only a concern with modified heads - when I get around to heads, I'd have more than enough money to pull the pistons and have the flycut, so that's not a big concern. Right now, I'm pretty much split 50/50 on the T-Rex and the G5x3.
Really, what is the best way to look at a cam and determine if valve clearance is going to be, or could be, an issue?
Really, what is the best way to look at a cam and determine if valve clearance is going to be, or could be, an issue?
Originally Posted by blkZ28spt
That kind of thinking can get you in trouble. There is a lot more to it than simply the numbers @ .05. Example: The G5X3 is often said to not fit under stock heads on a 112. It does, but it's close and LG apparently didn't want to take the chance that someone would install it off ever so slightly, miss a shift, etc and have problems. The X3 is a good bit smaller than the T-Rex....
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
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From: BFE
Originally Posted by s346k
i was merely thinking...if i had any question about ptv clearance i would use the clay method of checking. i am aware of what is involved in cam selection and what's required to make it work properly. only speculation..
Dial indicator measurement is the way to do it.
the G5X4 is also smaller than the TREX. i believe as far as stock heads are concerned, the TREX is about the biggest you would want to do. the TREX is a 242/248 .608/.612 110 lsa.
Originally Posted by s346k
if you have a stick car, valve clearance is essential due to the simple fact that it will be much easier to plant a valve in your piston if you miss a shift. springwear is the only other negative i can see. as far as the x3 and t-rex go, the t-rex is much larger and would require more attention to tuning and general setup (gears, tire, etc). both cams should pull to 7k, so don't be afraid of high rpm use to get the most out of either cam.
I'm really looking harder at the T-Rex now, because it seems like it'd offer more potential with aftermarket heads, because of the lift numbers, although the G5x4 looks pretty damn good in that area, also. When I swap to a different set of heads, I'll just have the pistons pulled, spec'd, and flycut accordingly. I'll definitely be using either Crane 921s or PP Duals, although that'll take a bit more research for me to decide on. Definitely a hell of a lot bigger cam than I started out wanting - the 224/224
Well, the problem is solved - I can get a T-Rex, used, for a really damn good price, and since it was down to that or the G5x4, T-Rex it is. Now to start buying the rest of the valvetrain stuff.
