how big can i go, will any machinest do it, how much would it cost, and how much more power would it add?


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Trent
---Car---
89 Firebird/305 L03 TBI A4/t-tops
Open Element Edelbrock Aircleaner w/ K&N air filter/Summit Chrome Valve Covers
Edelbrock TES headers 3" out/flowmaster American thunder 3" exaust/Catco cat
---Stero---
Pioneer DEH-P730 Premium
Infinity 2way 4652 4x6's/Pioneer 4way ts-a6985 6x9's
profile cl640 110x4

 

Cost between $40 and $80 to do it.The machinist needs to take the time to index the bores so that the bore is exactly in the middle. The walls are very thin. Mine is 1.98
". I don't think it will make much of a difference on an LO3.If you go to some better heads or a 350 then maybe.......bob


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91 camaro RS convert,GM crate 350 with LT1 cam,edelbrock 6085 heads,9.5:1 comp, edelbrock TBI intake bored to 2", 65# injectors,454 TB, Command perforance custom chip(still tunning) ,dual fan conversion,
ultimate TBI mods,TBI spacer,SLP 1 5/8 headers,
3"cat back,Flowmaster,
T-5, centerforce 2 clutch, 3.42 torsen posi,alston SFC's,Global West LCA relocation brackets, edelbrock STB

 

Yeah, I really don't think it's worth it unless you couple it with the 454 or Holley throttle body and a nice pair of heads and some PROM tuning.

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1992 Camaro RS (Auto) 5.0L TBI
-
Performance mods
NOS (125 HP shot), Dynomax cat-back exhaust, Hedman headers, no cat, custom high beam delete ram air w/ K&N, MSD 6A ignition, MSD 8.5mm plug wires, LT1 camshaft
Soon to be installed:
Edelbrock Perfomer TBI intake, B & M 2200 RPM stall torque converter, Trans Go shift kit, World Products Torquer heads, Ed Wright Fast Chip

Audio
Sony Xplod CDX-M610 head unit, Pioneer 2-way 4x6 front speakers, Pioneer 3-way 6x9 rear speakers, 12 inch Pioneer VCCS PRO subwoofer, QLogic sealed box, Kicker ZR360 amplifier, Lightning Audio 1 farad capacitor

Other
Macewen White Faced Gauges/Shift overlay, A-pillar gauges (Phantom oil pressure, Air/Fuel), 180* thermostat, Window Tint, chrome valve covers, xenon headlights

 

I heard that you can't bore the Edelbrock intake out to 2" like the 454 TBI is. Is that true or am I just full of it?

 

I thought it wasn't possible either but RSsilver did it.

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-Tas
'89 Formula WS-6

305, TBI, 700R4, P.A.W. 14x3 open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips, Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248)
Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options

 

Bringing this back from the dead ....
I know you can't bore one out to 2 inches cause i have one in the shop now a guy tried to have bored and hit the water jacket on the right side bore , I got it off ebay for 25 bucks and its costing 90 to have a sleeve installed.

 

I'd say you got the short end of a casting difference.
I've heard it being done before...

 

consider using a holley tbi manifold. it is 2.00 bore. ebay?

 

Mines been bored out to 50mm and I haven't had a single problem. So NO the walls aren't to thin to do this, Maybe if the manifold was bored out larger than this you might have a problem. Plus there have been MANY people on this board that have done it.

 

Add me to the list of people that have bored them to 2.00".

I would go with Vortecs and a 2" bore marine intake, lol.

 

my gmpp tbi vortec intake is ok, bored it to 50mm

 

My hand is also raised for hitting 2" on the Edelbrock unit. Perhaps earlier castings had thinner walls.

The Holley unit may be your better option. Buying and modifying the Edelbrock unit will come at around the same cost, if not more, than the Holley unit. The downside is that the Holley unit is not 100% interchangeable with the stocker like the Edelbrock unit is. No big deal though and everything is pretty simple to hook up with standard fittings.