I recently bought my 04 gto with an lq9 6.0 swap. I knew it was cammed but the owner didint know what cam it had when I bought it. After replacing the clutch and rear main seal I saw the back of the camshaft from the rear of the engine. I looked up the part number stamped and found it was a Howard’s cam

Here’s the specs:

howards cam rattler

Cam Style:

Hydraulic roller tappet

Basic Operating RPM Range:

2,200-6,500

Intake Duration at 050 inch Lift:

226

Exhaust Duration at 050 inch Lift:

234

Duration at 050 inch Lift:

226 int./234 exh.

Advertised Intake Duration:

275

Advertised Exhaust Duration:

282

Advertised Duration:

275 int./282 exh.

Intake Valve Lift with Factory Rocker Arm Ratio:

0.525 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio:

0.525 in.

Valve Lift with Factory Rocker Arm Ratio:

0.525 int./0.525 exh.

Lobe Separation (degrees):

109

My question is, will this cam work well with my centrifugal supercharger that I’m installing? Or will it hinder any performance?

I don’t know the hp yet. I've got one of those powerdyne bd11s, yeah I know, not the best but it came with the car. I think it has a 10lb pulley. I installed a monster lt1 clutch kit. Other than that I believe everything else is stock on the drivetrain unless I discover more stuff that the previous owner forgot to tell me about.

I think it would work great if the lobe separation wasn’t so tight.

You have a leak somewhere. Probably the bov.

Trust me I’ve checked everything, from pressurizing the intercooler to 30psi to check for leaks, bypassing intercooler all together,then removing vacuum line to bov so it stays shut, then removing bov all together and running straight to the throttle body, each time I logged it with an obd scanner to find MAP readings of kpa along with a mechanical vac/boost gauge. Each time I had 102 kpa of pressure in the manifold. The blower definitely works and pushes a lot of air. I guess the cam I have really is keeping me from building boost idk.

i seriously do not see it being the cam. Even if it was a limiting factor you’d still get a few psi. What supercharger are you using?

Can you delete the blow off valve temporarily? You’ll need to do process of elimination. Maybe the blower is too small for your engine but I doubt that would keep you from seeing at least a little boost. Are you using a 2 bar map? Is the ve table scaled for higher than 105kpa? Are you using a boost guage? Are you running real rich? What’s your timing at? Who’s tuning it? Can you by pass the intercooler? Do you have an intake leak? A lot of aftermarket intakes require you use flatter bolts in the valley cover. If you don’t it holds the intake up ever so slightly. I had this happen to me once not knowing. Did you block off all of the vent vacuum ports or put check valves in the ones that need it? My throttle body had a fitting that connected a hose from the valve cover to the throttle body for crankcase evacuation. I had to block that off and vent the crankcase into a filtered catch can. Can you post pics of your install and setup?