I know what 112 LSA is, but what's the plus 2 mean? Might be a stupid Q.

+2 degrees?

Thanx.

I'm posting because I'd like to see the full answer too, but I think it has something to do with the number of degrees of advance. I'm sure I've read it before; did you search?

it has 2 degrees of advance ground in it...when you install the cam gears up dot to dot, you will already be +2 advanced

It means the cam's intake lobe centerline is at 110 degrees (aka 2 degrees of built-in advance).

The majority of LS1 cams are ground 4 degrees advanced. Whoever specced that cam was probably going for more peak/high rpm power.

Mike

so if +4 is common, bayer has +2 for peak, whats a +1 do? asking because thats whats on mine.

also, with built in advance, does a nitrous control box compensate for the extra advance?

+1 would give you more high end and make the cam peak later as compared to +4.

My cam is acutally installed -6 or so due to the fact that it's a small cam in a large motor. The cam was kept small to keep mid power and drivability, but then retarded to act like a big cam and make it peak higher. That's why the power still peaks at 6000 even though it's a 238/240 cam in a 408.

Spark Advance and camshaft ICL vs LSA are two different things.

Mike

I think the nitrous control box advance you are referring to is spark advance not valve timing.


Ok. I get ya. The 112 LSA for example would have a narrow power band. The +2 just bumps the peak power up a little more due to valve timing advance.

If I ever get a advanced cam, I'll be extra careful to check PTV clearance.

Thanx y'all..

AFAIK you advance a cam to move the power band down the rpm range and you retard a cam to move the power band up the rpm range.

Most LS cams are +2 to +4 to give them better low end power.

+2 isn't anything abnormal so I wouldn't worry about PTV clearance myself. My cam is 112+2 and I have ~.590 lift and 226 duration. No PTV clearance issues.