I understand that they are diff for the 305& 350.what effect would it have by having one from a 305 in a 350.I'm sure isn't for the better but I'am curious..?

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1991 1LE Z28 355cu 5SPD (ORIGINALLY 305 BEST E.T. 14.186@99.86mph)NO PASSES ON 355 YET.MINI RAM INTAKE,AFR 190 HEADS,10.23:1cr 24# SVO INJECTORS,BBK 52mmTB,AFPR
FULL ROLLER MOTOR,1.6 rockers MSD 6AL
AUTOMETER A/F GAGUE MARCH PULLEYS,HEDDMEN HEADERS 3IN EXH NO CATS FLOWMASTER,POWER TRAX NO-SLIP LOCKER,3:42 GEARS,LAKEWOOD LOWER CONTROL ARMS HOTCHIKS STRUTTOWER BRACE,COMPETTION ENG.SUBFRAME CONNECTORS
MALLORY TACH W/SHIFT LITE
BLACK, TINTED WINDOWS, TAIL LIGHT COVERS BIG BLOCK COWL INDUCTION HOOD,SHAVED DOOR HANDLES

67RS 327cu 92K ORIG MILES.NEWER GM HEADS HEADERS,650 HOLLEY CARB,CAM, 350 TURBO TRANS W/SHIFT KIT&COOLER 12 BOLT POSI 3.73'S MUTLILEAF SPRINGS
NEW VINYLROOF&CARPET, COWL HOOD,HIDE AWAY HEAD LITES,

 

I know it has been said that they're different, but I really have to wonder why they would be! It makes sense to me that the ESC "filter" would be different, but it doesn't seem reasonable that they couldn't use the same sensor.

 

i would like to know this also.

 

I'm just taking a WAG here, but it could be the 305 sensor is more sensitive than the 350's, due the sides of the 305's bore being further from the outside of the block.

Again, just a guess.

 

Glad to know there are others who aren't sure.Still waiting for someone who understands to help clear this up .I like to learn as much as a can

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1991 1LE Z28 355cu 5SPD (ORIGINALLY 305 BEST E.T. 14.186@99.86mph)NO PASSES ON 355 YET.MINI RAM INTAKE,AFR 190 HEADS,10.23:1cr 24# SVO INJECTORS,BBK 52mmTB,AFPR
FULL ROLLER MOTOR,1.6 rockers MSD 6AL
AUTOMETER A/F GAGUE MARCH PULLEYS,HEDDMEN HEADERS 3IN EXH NO CATS FLOWMASTER,POWER TRAX NO-SLIP LOCKER,3:42 GEARS,LAKEWOOD LOWER CONTROL ARMS HOTCHIKS STRUTTOWER BRACE,COMPETTION ENG.SUBFRAME CONNECTORS
MALLORY TACH W/SHIFT LITE
BLACK, TINTED WINDOWS, TAIL LIGHT COVERS BIG BLOCK COWL INDUCTION HOOD,SHAVED DOOR HANDLES

67RS 327cu 92K ORIG MILES.NEWER GM HEADS HEADERS,650 HOLLEY CARB,CAM, 350 TURBO TRANS W/SHIFT KIT&COOLER 12 BOLT POSI 3.73'S MUTLILEAF SPRINGS
NEW VINYLROOF&CARPET, COWL HOOD,HIDE AWAY HEAD LITES,

 

I can't believe that the 305 and 350 are constructed differently enough that they'd have to use a different sensor. Any difference in the "sound" of the knock could be compensated for by using a different ESC filter. Anyway, what I'm wondering is if I can use a knock sensor off some other SBC-powered vehicle. The junkyards have to be full of late model trucks and what-not that have these, and it would be one less thing that I'd have to buy. It is solid-state after all, it shouldn't really "wear out" over time. The one I pulled off my 305 TPI motor is really rusty, and I figured I'd start with something newer before putting the 350 in!

You know what else I'm wondering, could the IAT and CTS sensors be the same? They sure do LOOK completely identical, and they're both being used for about the same purpose..

 

I think they are the same, but when you go buy them, it'd probably be better to ask for both.

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1990 Pontiac Formula 350
Rebuilt 355
COMPCAMS 212/212 .440/.440 cam
Flowmasters 80 series.

 

Well, time to put this topic to bed.
The 350 and 305 use different knock sensors.
The 350 use Delco # 213-90
The 305 use Delco # 213-89

To top it off, the ESC changes too.

The 350 uses an ESC100
the 305 uses an ESC 105

The control module for both cars is the same.

Cheers

Richard

 

Richard, what exactly is the ESC? I know it stands for electronic spark control, but where on the car is it? It's not on either the engine or the distributor is it? I'm doing a swap between a 305 and a 350 TPI so I figure I might as well change it if possible.

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91 Z28
Come see The Vicious...

 

I believe that is the yellow box attached to the computer bracket behind the dash.

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87 Black on Black T/A
T-Tops Digital dash
5.0 TPI S/R Torquer 305 heads Summit TPI cam
204/214 @.050 .420/.442
SLP headers and catback
A4 with 3.42 gears
Fully loaded and everything usually works.

 

The yellow box is for the VSS, the ESC on my car is mounted over on the driver side firewall by the mess of relays. Its black, square, kinda thin, has like 5 or 6 wires going to it.

 

If your concerned with sensativity of the Knock sensor just wrap it a couple of extra times with teflon tape and it will decrease the sensativity (or so the book on Chevrolet high performance TPI induction I just read claims.) I have not needed to try this as I run premium with Klotz octane booster to up gas to roughly 100 octane. And it smells so good when you pull up to a light and the exhaust breezes past your nose. Oh Yeah!!