Since changing transmissions, as posted in a different thread, I've really noticed the limitations of the stock intake above 4200. I've been researching the TPIS and FIRST intake setups. I have the factory head that was ported for 2.02/1.60 valves on a block bored .020. My question is, will I see any intake benefit with that head setup?

 

From what I've read in the past, particularly with Orr's experiences, is you will see a gain even on a stock short block. The heads aren't limiting the rpm that low, so an intake that opens higher rpm up should give you a gain. Eventually I'll be changing my stock intake to a ported and somewhat siamesed setup in attempt to raise the average numbers up all across the board even if it doesn't raise the rpm band into the 5k range.

 

Actually the car can slow down and it will need a new tune esp with a miniram. Is the car an auto or stick? If its an auto you will need to up the shift points at WOT as well

 

I went from a 700R4 to a T5

 

My LTR TPI setup with nothing more than an airfoil and Edelbrock 3817 base to match my Vortec heads pulled all the way up to 5,500-6,000 rpm without falling off much. Was not a big cam either. Just a production 203/210 @ .050 LT4 cam and 1.6 rockers. I would say your stock valve springs are giving up.