Mkos1980

iTrader: (8)

stock TB or get the 52TB?

nicksL98

iTrader: (6)

Depends on what cam you are running.. 52 mm would be okay for stock 350.. that is what i HAD, anything bigger and i would go get a 58mm tb. I have a 58 for sale BTW, email if interested.

Blade

Hey I'm interested! How much ? Email me at wind95@hotmail.com

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92 Z28 L98 350
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Ported and polished heads, ported stock TPI base, ported plenum, Comp Cams XR270HR-10 cam (lift .495/.502 duration 218/224 lobe separation 110), Edelbrock TES headers, LT4 valve springs, Crane AFPR, Flowmaster catback with LT1 style tips, MSD coil & wires...

"Take that auto, drop it in first, hold the brakes, stomp the gas and grin from ear to ear! :-)

Hunter Motorsports

A 52mm Throttle Body is good for the baddest of 350's. They flow 850+ cfm on average and that is dry flow. Larger motors like 383's can see an improvement from a 58mm TB, but it is a small improvement. The big throttle bodys make big numbers like "1000 cfm" and this impresses people and they buy. A stock throttle body with an airfoil will support 400+ horsepower on a 350 engine. The new 502 bigblock crate motor from G.M. makes over 500 HP with a 48mm TPI throttle body. Yes thats right, 500+hp with the same throttle body that comes stock on YOUR tuned port F-Body.

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Karl Hunter
Hunter Motorsports
Vancouver, B.C. CANADA

Blade

Yeah but I betcha if they put a BIGGER TB on that 500 horsepower beast it will make 520! LOL

scotty d

Karl from hunter mortersports, thanks for putting the larger TB question to rest. i have read just about every TPI performance book thats been printed and they all share the same feeling about different sized TB's. i almost fell victem to the belief that bigger is better but after research relized it would be a waste of money that i could have been saving for new heads.

Grim Reaper

Yes, more people should consider heads as one of their first mods. If you add up all the money to change the base, runners and TB, you would have spent damn near as much money as a decent set of heads and won't have the same performance gain.