Hey guys, I have a few questions about porting the stock TPI. First, if I siamese the two bores on the plenum that the TB bolts up to(or make them bigger at least), would there be any gain? I already flattened out the walls behind them. Also, how about siamesing or enlarging the outlet holes of the plenum, and then knife-edging the runners and base? The car its for has a small cam and 24 lb injectors, but nothing else (Friend's car). Any thing other suggestions?

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1990 Pontiac Formula 350
Rebuilt 355
COMPCAMS 212/212 .440/.440 cam
Flowmasters 80 series.

 

From the sound of it no, it won't help, you'ave already done what needs to be done. The base is the real plug after that the runners. And of course don't forget the log exhaust manifolds.