Stevo86

I don't mean stress on the bottom end I mean stress on the valvetrain, because the valves are opening more there is that much more stress put on the springs, followers, etc. The car won't run like crap but it won't really start making power. Think of a car with a higher rpm cam like a two stroke. With aftermarket cams the term "powerband" really comes into play. Basically the operating range of a cam is when it will start making good power to when it will start to drop off.

Valve reliefs are notches cut, cast, or forged into the piston tops to allow space for the valve when it is open. Modular motors are "interference" engines which means if they are not timed properly or if the cam has too much lift it is possible to run pistons in to valves. As an example I have a MHS stage 2.5 cams and my pistons had to be forged with reliefs so that I don't have any interference. You need to verify that before you purchase your cams otherwise you will be scrapping a brand new engine.

Dragonus18

I asked the manufacturer and they said that they have no PTV (piston to valve) issues at all. Does that mean I'm ok? Is it safe to say that before the car gets into its powerband that it'll run like stock or a little worse?

Stevo86

Probably and no it will run fine

Dragonus18

Stevo, I heard that with a blower cam that it'll lower my boost but I'll be still making the same amount of power. Is this true? If so how is this possible?

Stevo86

Because stock cams and heads are more restrictive therefore more air gets backed up and the PSI is raised. Think of a garden hose, with the end unplugged more water flows but at less pressure. Put your finger over the end and less water comes out but at higher pressure.

Dragonus18

So if I changed the heads to say the trickflow twisted wedge 44cc heads than I would experience the exact same effect of lowering the psi but keeping the same power?

Dragonus18

Bump!

Dragonus18

Bump!