I know the biggest performance gain would be seen if I had a blower or forced induction of some kind but hasanyone dynoed changing tbs after heads/cam

 

We did a little testing up at www.woodbridgedynotech.com and in the same dyno session swapped a stock 48mm tb for a 58mm BBK on a car in the 465hp range. It was worth ~10rwhp if I recall correctly.

 

Yep, opened up before it went back together for a 58 in the future.

 

Was that 10rwhp at peak or across the whole powerband

 

From my understand on a regular 350 (not stroked or forced induction) getting a bigger TB really isn't worht the $$.....it's always debated here. I posted about 8 months ago the question (I think the title was "Bigger TB: WOrth it?" or something....do a search) and there was a TON of replies.

 

That was the gain at hp peak (not necessarily peak gain), but I do believe it gained a fair bit through the whole powerband, 6-10hp/lb-ft.

 

Thanks for the good info.

Ryan