How much does the Stealthram Base need to be milled to fit under a stock firebird hood?

 

You don't have to if you don't mind clearancing the hood braces.

 

I have a mill at my disposal and would rather not clearance the hood bracing.

 

Then you need to install and measure because each engine sits at a different height due to age and material of the engine mounts.

 

I reduced the total height of the assembled intake by a 1/2" and it fits under a stock Firebird hood, there's approximately 1/8" to 3/16" of clearance but the hood closes without coming into contact with each other. The base at the plenum mounting sureface was milled down a 1/8", the plenum at the base mounting surface was milled down 1/8" and the top of the plenum was milled down 1/4". Also since the motor sits facing up at a 3 degree angle the plenum at the TB mounting surface was milled down 1/8" farther lowering the overall height. After doing all this the hood closes but I had an issues with the thermostat housing coming into contact with the bottom of the TB, I bought one of , figured out how I need to clock it then I JB welded the two pieces together and milled off the appropriate amount of the water mounting flange, I will say this is still untested as the car isn't running yet but there still seems a good amount of material left of the base thickness to resist warping, we'll see

 

Nice! Do you happen to know how thick the base of the thermostat housing needs to be? I just installed an HSR and having some issues with the housing and might need to do something similar.
From the picture you posted it seems you’re not using the Holley fuel rails? You might have an issue with the throttle body linkage hitting your fuel rail fittings.

 

I don’t remember the thickness of the base, I was shooting for overall height, I measured the distance between the housing mounting surface and the bottom of the TB minus an 1/8” and that was the goal, your distance may vary
I am not using the Holley fuel rail, I’m using a Professional Products SBC kit, this picture shows the clearance better.

 

Those fuel rails are nice, specially having the crossover right in the middle I should of used something like that for my setup instead. Thanks

 

Yeah that’s one of the reasons I’m using this rail kit I was anticipating an issue with the Holley fuel rail cross over being in front because of the lower profile of the intake.

 

If you would have posted the picture with the rails you used 1-2 weeks ago I would have tried to do what you did instead of trying to make Holley rails work. I didn’t have the Holley metal crossover tube, so I had to make my own crossover and yes everything gets in the way.