I have a stock bottom end LT1 and am considering buying this cam for it but I need to know if it will clear as far as piston/valve clearance

245/252
.577/576
114lsa

I figured this would be the best section for such a ?

 

I know people hate to hear this, but you need to measure it rather than make a guess. Only exception would be if you can find someone with exactly the same combo who HAS measured,

Rich

 

Well I will be running the K800 springs with this cam. Will I need to have the spring seats machined for those springs?

 

Dude that is a HUGE cam!

You should consider going smaller.

Take advantage of what the LT1 has
going for it in terms of heads/intake.

that cam is gonna wanna spin over 7k

 

What heads are you running? you will need atleast 230cc runners to even flow that cam. And the RPM range that suits that cam is so high, the stock rods wont last long if you push it and keep the rpm where it likes to be.
That cam would have an opperating range of aprox 3200-7300 rpm. So you would need a stall convert. to match it. And it wont be much fun on the street.

One of the best street cams if you dont mind solid lifters is the Duntov 30/30 grind. Or something in that range.
find something say .495 lift/ 235 deg. @.50 duration.
Such a cam would give you decent streetability, and would work with say 170cc runners. Not to mention a power range in the 2000-6000 rpm range, so you would still have some decent low end torque.

 

Well the next step is heads. I want a heads/cam 355 that can make 430rwhp

 

Comp said the power on that cam is from 3800-6800. So I'll spin it to 6,500 on the stock bottom end 4 now. Unless ya'll think that it'll handle 6,800 rpms. I know LS1's do it but that's a different motor all together. So let me know

 

Comp is not considering the LT1s intakes effect on powerband, scale the duration back about 20 degrees and tighten up the LSA 2+ degrees and then you will be ballpark for something that would actually be a good idea. The 114 on that is done to bandaid a wildly too large cam and it will make it more drivable but will also cripple it's ability to make proper power. You would be much better off with something smaller. Also to hit your power goals WORK WITH THE PORTER on cam selection or you will not hit your mark.
Mousebuilder sounds like he has a lot to learn about the LT1 as well, under .500 lift on a 235 degree cam sounds damn near flat tappet not to mention in the LT1 a 21X duration cam is usually reved past 6000rpms.

 

What I find funny though is most people that go with a CC306 a lot of times end up saying they wish they had gone bigger. It's a big cam but the whole purpose is to make some sick cam only power until I get a set of ported heads or invest in some AFR227's.