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Help with cam selection...

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Old Jan 30, 2016 | 09:46 PM
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Default Help with cam selection...

I just recently ordered a 418 LS3 based short block for my C5Z. But I really can't decide on a cam. In my LS6 I had the Vengenace Racing Vindicator cam. Made 456rwhp cam and exhaust only. That's a pretty aggressive cam so I guess I'm looking for something just as aggressive or if not a bit more. I was looking at their 'SumBich' cam for the LS7 but would that be too much for a 418? Should i go custom grind? What are you running in your 418s? It's not a daily so I'm not worried about drivability too much. I just want to go all out.
I have a FAST102 and matching Tb on the way. I plan on ordering Trickflow 235s. Probably milled down about -2 cc to raise compression a bit. Since I'm most likely going with a big cam i believe that lowers dynamic compression and i shouldn't have a problem running pump gas on a 11:5 or 12:1 setup. Pistons have -4cc valve reliefs. And i have no idea on gasket thickness yet. I think i would also like a short travel link bar lifter setup. But i would like some opinions on that as well. Would the SumBich be too much? If so what do you recommend? I'm a bit new at this. I just know that i want an insane C5Z
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Old Jan 31, 2016 | 10:45 AM
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Without a doubt, go for a custom spec'd cam unless you know of a proven design for your build that meets YOUR needs. I used Martin Smallwood when he was at Tick Perf, but there's several others that can spec a cam for you.

Last edited by petsur; Jan 31, 2016 at 10:46 AM.
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Old Jan 31, 2016 | 06:01 PM
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Originally Posted by Johnny5898
I just recently ordered a 418 LS3 based short block for my C5Z. But I really can't decide on a cam. In my LS6 I had the Vengenace Racing Vindicator cam. Made 456rwhp cam and exhaust only. That's a pretty aggressive cam so I guess I'm looking for something just as aggressive or if not a bit more. I was looking at their 'SumBich' cam for the LS7 but would that be too much for a 418? Should i go custom grind? What are you running in your 418s? It's not a daily so I'm not worried about drivability too much. I just want to go all out.
I have a FAST102 and matching Tb on the way. I plan on ordering Trickflow 235s. Probably milled down about -2 cc to raise compression a bit. Since I'm most likely going with a big cam i believe that lowers dynamic compression and i shouldn't have a problem running pump gas on a 11:5 or 12:1 setup. Pistons have -4cc valve reliefs. And i have no idea on gasket thickness yet. I think i would also like a short travel link bar lifter setup. But i would like some opinions on that as well. Would the SumBich be too much? If so what do you recommend? I'm a bit new at this. I just know that i want an insane C5Z
Just because the cam is "big" doesn't mean it will lower the DCR. A narrow LSA and some ground in advance can get the DCR pretty high even with a lot of intake duration. You're adding stroke too...which will up the DCR vs stock stroke....all else being equal. Like petsur mentioned, having a pro spec you a cam may be the best money you can spend.
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