L77 DOD lifters

[daves8]

is it needed to replace the dod stuff if you put on a blower?

I know they are not built to rev high, hence the lower cut out, would someone be playing with fire leaving them in putting a 2300 on, if the redline was kept conservative?

 

[Forg]

What's your reason for asking?

My reason for this question is that I don't think I'd be saving that money by leaving them in place, if I were already doing that much work to the car; and if you're planning on force-feeding it, you're obviously not concerned about the fuel economy.

 

[Ross Wonderley]

I'm told the accepted practice is to remove DOD if you are doing significant engine mods. It eliminates the potential for problems, and you can run a better camshaft profile.

 

[Skylarking]

The LT4 supercharged V8 is used in ZL1 Comoro and provides 485kw & 881 Nm. As I understand it, this engine has both AFM and continuously variable valve timing.

I imaging it works very well so I guess anything (L77) can be engineered to perform when one has a big GM style budget to play with.

But my understanding is that AFM has a slightly different cam profile for the cylinders that can be shut down. As such, when people want to drop a performance cam in their engine, the AFM gear is always removed as i guess it simplifies the builders job. Same seems to be the case with adding a supercharger.

But what is your engine builder recommending?