Okay, I'm either getting the edelbrock performer or RPM intake for the 350HO engine (vortec heads). Now I thought I was just going to get the normal square bore to TBI adaptor but I was just looking at all the other adaptors and they look better. I remember somebody telling me that the square to TBI doesn't look like it was completely finished. Something to do with the bore being really rough and long. Now as I look at the other adaptors on the holley page: http://www.holley.com/HiOctn/ProdLin...IA/Access.html , I notice that some even have the holes drilled to mount the TB backwards. Whatever, I'm just trying to figure out the best spacer/adaptor for my swap before I go out and buy something that is inferior.

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, Jon (91 RS too many mods to list), getting new engine in summer

 

I think I'm going to go with the normal adaptor since I'm leaning towards the performer RPM. Are there any other vortec intakes other than GM and edel?

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, Jon (91 RS too many mods to list), getting new engine in summer

 

None that I know of. Or at least that's the only ones I've seen.

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82 Z28 350, Ported #882 Heads, Performer RPM cam and intake, hedman headers,650 Demon carb,
Trans: Turbo 350 w/ 4000 stall -- Rearend 7.5 w/ Richmond 4.10's, Auburn Minispool
Best ET: 12.52@107.2
Future plans: Dart headed, Roller cammed 383 in early '01


89 RS, L03 305, Hypertech Chip,cat delete, Dynomax exhaust,K&N open element Filter,160 stat, MSD coil --Trans:700R4 Corvette Servo -- Rearend: 7.5 GM 3.42 w/ posi-lock
New Best ET: 14.91 @92.9
Bassett Racing
Mid Atlantic F Body -82 Z28 Page

 

hmm i just used the turbo city one..back when i got it last year that is what everyone said to use.

-brian

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1991 Camaro RS - Ultra Blue Metallic, T-Tops
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GM 350 HO Crate Engine - Vortec Heads, Edelbrock Intake, Holley 670 CFM TB, Edelbrock Water Pump, March Pulleys, MSD 6AL, Blaster Coil, 8.5mm Super Conductors, Cap and Rotor, Rapidfires, Hypertech Fan Switch & Chip, SLP 1 3/4" Stainless Headers, 3" Cat Back, Flowmaster 40 Series
700R4 - 2,400 Stall Converter, Vette Servo, Shift Kit, B&M Super Cooler
GM 10 Bolt -coming soon Auburn Pro Series Differential, Richmond 3.73s
Brian's 1991 RS Central NY F-Body Association
Join the Third Generation F-Body TBI Web Ring
z28boy@twcny.rr.com IM name: Z28 Boy

 

i just checked out that page..

what the hell is that one that is cooled my the engine coolant? man..i never saw that one before. anyone know anything about that bad boy?

-brian

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1991 Camaro RS - Ultra Blue Metallic, T-Tops
----------------------------------------------
GM 350 HO Crate Engine - Vortec Heads, Edelbrock Intake, Holley 670 CFM TB, Edelbrock Water Pump, March Pulleys, MSD 6AL, Blaster Coil, 8.5mm Super Conductors, Cap and Rotor, Rapidfires, Hypertech Fan Switch & Chip, SLP 1 3/4" Stainless Headers, 3" Cat Back, Flowmaster 40 Series
700R4 - 2,400 Stall Converter, Vette Servo, Shift Kit, B&M Super Cooler
GM 10 Bolt -coming soon Auburn Pro Series Differential, Richmond 3.73s
Brian's 1991 RS Central NY F-Body Association
Join the Third Generation F-Body TBI Web Ring
z28boy@twcny.rr.com IM name: Z28 Boy

 

JPrevost, those multiple hole adapters are not for mounting the TBI backwards but for flipping the adapter over if it works better for your applications. That way, you can still mount the TBI becasue the holes are already there. You must plug the 3 non-used holes in that adapter with plugs/loctite or you'll have vacuum leaks, obviously. That adapter comes with the ProJection 2DI kits, fyi.

 

So what are my options? How much is the turbo city adaptor? I'm really just curious about the heated plate and the reason why the holley TBI-square bore has that really ruff looking bore. What the hell is that? I'm going to have to call up Holley and ask.

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, Jon (91 RS too many mods to list), getting new engine in summer

 

Don't buy that turbo city piece of crap plate! It is bare steel (rust!). On mine (2" version), the opening was just a big oval that was cut out with a plasma cutter or similar and wasn't even cleaned up afterwards. My butterflies wouldn't even open because the cut started and stopped on the radius below one of the butterflies, making the cut wavy! Well, after running a 2" end mill through, I found out that the countersunk hole wasn't even 82 degrees-they just used a drill bit! What a piece of crap.

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'93 2wd truck
408 sb, vortecs, 454 TBI, Comp Cam, dual exhaust

[This message has been edited by SCRA rules! (edited February 15, 2001).]

 

Okay, so no turbocity, thanks for the input. Now would somebody tell me why the holley TBI - square bore looks like it's unfinished. I've read other posts about this and people say it's suposed to be there, I just don't see the point. Doesn't ruff = less velocity? That's the whole idea behind porting and polishing isn't it..
Okay, I'm gonna call them and I'll get and answer. Also does anybody have the bolt numbers for the adaptor plate? This is gonna be my first engine swap and it needs to be done in less than a week. Kind of pushed for time so I'm trying to get EVERYTHING ready so I'm not running around for parts.

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, Jon (91 RS too many mods to list), getting new engine in summer

 

IMO you do not have to wory about the finish on the 2" holes in an adapter plate for flow... You may/could radius the bottom egde of the adpater bores to reduce the square-edge flow turbulence but you won't really be able to feel any difference until above 6000 or so so not worth it, really.

 

On the contraire, the engine is going to see 6500 as a redline when I'm done with it. New cam, new valve springs, new torque converter and the intake manifold is going to be the performer RPM (1500-6500). I'm going for 380hp when I'm all done and it is very possible since the current cam shaft is extreamely small, small enough to pass the sniff test no problem. So, high flow is going to be a must.

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, Jon (91 RS too many mods to list), getting new engine in summer