GM parts numbers for current production heads
 

So in my search for 243 castings I came across this, you can download the magazine for yourself at Chevy Performance: High Performance Racing Parts. Also i have access to factory service manual info (torque specs, procedures, tools, fluids etc.) via alldatadiy.com well worth the expense if your going to be working on your own vehicles. If you don't want to pay and are looking for something specific like a torque spec I may be willing to look it up if you ask real nice like :hail:. For instance I learned when installing manifolds it recommends a 11ft-lbs for first pass and 18ft-lbs for second pass and applying high temp thread locker (loctite 272). https://cimg8.ibsrv.net/gimg/www.per...5330e2d266.png

Torque specs....pffft.

I use the German specs.

its all fun and games until theres aluminum sprinkles everywhere :rage::madcat::turd2: