I can get a BBK 58mm (i know its too big for my even built 355 with heads etc...)... but HOW MUCH HAVE YOU GAINED WITH AN AFTERMARKET LIKE BBK???? please say what size it was to and what mods you had with it!

 

i didnt notice any major difference when i chaged the tb. i used a 58mm from bbk

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91z28 350tpi auto, runs 14.3... aim screen name nice3rdgenz
http://www.fbody.com/members/nice3rdgenz/index.htm

 

HotRod TV changed the stock throttle body out on a 4th gen, as well as reconfigure the computer programming. They said that the dyno results after the swap resulted in 25hp, or something of that magnitude. However, that is on a 4th gen.

It should make a nice difference, but then again, any bigger than stock is getting close to overkill on a stock motor. Time to weigh the options... maybe other people have real life testimony that you can read up on.

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1989 Chevrolet Camaro IROC-Z
L98 - 350c.i. TPI, rebuilt 700R4 auto w/shift kit, Dual catalyst Monza PaceSetter Cat-Back, SLP 1 5/8 Coated Headers, 3.23 Posi rear, Hypertech Thermomaster chip with 160stat, MSD 6A, March Under-Drive pulleys, AFPR, K&N's, !Air Box w/ Ram Air, moddified MAF, !TB Coolant, Spohn Dual Cat SubFrame Connectors, Alarm, Keyless entry, remote starter, 92 Z28 AeroWing, Brand New Paint (6/21/01)

Future: ZZ4 TPI w/EGR, T56, 3.42 or 3.73, Spohn strut tower brace and LCA's, Accell Universal 24# injectors

More info and pics on my webpage:http://go.to/iroc-z

AOL IMer: GPA 0point0

 

Heres my list:
Fully ported TPI intake
Fully HOGGED intake
worlds Products heads (2.02/1.60valves) $400 port job at a machine shop
ZZ3 cam (.490/.501 lift???)
forged crank
24lb injectors
adjustable fuel pressure reg.
hyperouctic pistons 9.7 comp.
rebuilt world class T 5
3.42 gears with POSI
Headers, Y pipe, !CAT, Hooker Catback
and some more im forgetting

Do you think the 58mm will hurt or help me???
SOON TO BE LT1 Conversion

 

I don't think it'll be a waist if you have a lot of torque. I you might want to try a 52mm so you don't lose low end. Unless you plan on going w/ higher gears later.

I dyno'ed w/ 356ft lbs @ the wheels. I want to loose some low end so I'm going w/ the 58mm.

PS- the lift on the ZZ4 cam is the same as the ZZ3 - .474 / .510

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Mods: ZZ4 engine w/stock TPI, adj, fuel pres. reg., MSD 8.5, HI6S ign. w/ PS-91 coil, K&N filter, TPI air foil, Hooker comp. shorties, American Thunder flows. 160* stat., TB bypass, 3"cowl, bat. relocate, AC delete, smog delet, cats gutted, stock T-5 w/ 3.42 rear, ported plenum, 24# inj., dual friction centerforce.