I'm considering buying a ported 52mm tb, the companies hp gains seem unrealistic- 50+hp on a mild modded 350 tpi. How much inprovement can I really expect? Here is what I have. Balanced 355 with kb 10:1 pistons, comp cam 210/220/480/480/112, cast l98 heads polished exhaust ports/ chambers, z28 valve springs, comp roller
tipped rockers, slp intake runner & airfoil, cold air intake with k&n,
custom programmed ecu (map) 1 5/8" headers, 2 1/2" dual exhaust (no cats) flowmaster 40's, eaton 3.42 posi, 700r4 B&M 2500 stall, transgo shift kit.
The motor isn't making power over 4500rpm. Is a 52mm tb a good investment?

Thanks for any info

 

as far as i've heard they won't help much

 

you will notice more gain if you change out your intake manifold first to a high flow model. that is way more of a bottleneck than your throttle body. you mentioned slp runners buy a dremel and port the crap outa those things. in short the throttle body is the least of your worries right now.

and if you like the long tube set-up like me tell all of those stealth and mini ram guys to shove it. i'm guessing there just dying to put in there opinion.