TSP Stage 4 LS3 235/248 .649"/.615" Camshaft
05-19-2017, 12:08 PM
#42
That IS my opinion. Trust but verify. Vendor says it fits. great. I'm still measuring, and if I'm convinced the cam is what I want, then I'm flycutting if the clearance isn't there. That's no different than degreeing a cam when you install it to verify the ICL. But i'm not going to flame a vendor for something like this. I'll flame them if it's ground wrong and they don't make it right, but I've never had something like that happen with any of the ls1tech vendors.
BTW - it can't truly be a drop in cam - the lift is too high for stock springs. That alone should warn you it's not drop in...
BTW - it can't truly be a drop in cam - the lift is too high for stock springs. That alone should warn you it's not drop in...
Is the crank ground correctly?
Is the timing set accurate (loose/tight)?
Stable valve events (possible lofting and float)?
Are your trunnions going to eat themselves in 5000 miles?
Did you use skinny budget pushrods (that are going to flex and bend)?
and on and on...
The fact remains that the onus is on YOU, not some vendor, to do YOUR due diligence when building YOUR engine.
05-19-2017, 12:53 PM
#46
They said "drop in", but they were referring to PTV, not valve springs. Of course you have to change valve springs, and I'm sure they would not recommend running this cam with stock valve springs. That would just be silly. Why anyone would even think that "drop in" means cam only with no springs is beyond me!
05-19-2017, 01:24 PM
#48
They said "drop in", but they were referring to PTV, not valve springs. Of course you have to change valve springs, and I'm sure they would not recommend running this cam with stock valve springs. That would just be silly. Why anyone would even think that "drop in" means cam only with no springs is beyond me!
05-19-2017, 09:26 PM
#50
Calling an engine an LS3 does NOT imply it is bone stock. They are stating to check
PTV clearance because it needs to be checked, because of POTENTIAL clearance issues.
Assuming a baseline is a bone stock engine is your error. In a performance part install, assume nothing! You are changing conditions and/or characteristics of an engine, stock or not. As Darth says, "Be prepared to mod your car in order to mod your car."
PTV clearance because it needs to be checked, because of POTENTIAL clearance issues.
Assuming a baseline is a bone stock engine is your error. In a performance part install, assume nothing! You are changing conditions and/or characteristics of an engine, stock or not. As Darth says, "Be prepared to mod your car in order to mod your car."
Any cam manufacturer should be able to tell you this. They have to be using something as a baseline dimension for design and manufacturing. They all use the cam cam bearing sizes as a baseline don't they? You do not see a disclaimer on every cam telling you to check cam bearing siz before installation do you?
05-20-2017, 10:00 AM
#51
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Originally Posted by joyridin'
That is baloney. I have a bone stock brand new crate engine sitting here. Will the cam fit as far as PTV or not? Simple question.
Any cam manufacturer should be able to tell you this. They have to be using something as a baseline dimension for design and manufacturing. They all use the cam cam bearing sizes as a baseline don't they? You do not see a disclaimer on every cam telling you to check cam bearing siz before installation do you?
Any cam manufacturer should be able to tell you this. They have to be using something as a baseline dimension for design and manufacturing. They all use the cam cam bearing sizes as a baseline don't they? You do not see a disclaimer on every cam telling you to check cam bearing siz before installation do you?
Do I understand that's the difference between pulling the heads and not pulling them? Yes. It's also the difference between hoping you're ok and knowing you're ok. Especially if you plan to abuse the motor.
Also, at 0.035" clearance, I'd still flycut. The rods stretch at high rpm approx 030 iirc.
