Quote:
Originally Posted by Shownomercy
Can you prove that? Its not a carb so therefore you can't go "too" big. Isn't changing plenum volume, isn't changing runner length, so how exactly would a bigger TB hurt anything?
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Because the opening allows more air at a given throttle opening you loss the proper metering of air entering the intake plenum, in addition, this larger opening can hurt air velocity at WOT. Just like putting a big carb on an engine that can't use the extra air flow, even if you go smaller jets. It is as important to have the proper velocity in the intake as it is proper volume and the shorter runners and flow of the LT1 heads need that for proper distribution and RPM range they operate at.
When I had heads, small cam ( Lingenfelter 211/219 cam) and shortie headers I was making 337 RWHP, At E-town I went from a 52 to 58 TB and lost 2 tenths. After 3 runs, I switched back to the 52 and the car picked right back up.
As far as changing the intake, not that hard. Only thing that could be tricky is you either disconnect the fuel lines, or unbolt the fuel rails and hold them out of the way. be careful not to damage the O-rings on the injectors too.
I always use the Felpro gaskets. Make sure you clean the block and intake very well. And as stated already, don't skimp on the RTV. I actually dimpeled my intake and block so the RTV can't push out or move.