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heat riser-open or shut?

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Old

Feb 12, 2011 | 10:39 AM

#1

Thread Starter

Junior Member

Joined: Mar 2009

Posts: 37

Likes: 0

Car: 1983 Z28

Engine: 5.7

Transmission: T5

Axle/Gears: UNKNOWN

heat riser-open or shut?

I'm doing away with all my emissions and obd in my 83 z28. Just one question. Is the butterfly in the heat riser open or closed with no vacuum to it?

Old

Feb 12, 2011 | 11:15 AM

#2

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iTrader: (5)

Joined: Aug 1999

Posts: 19,282

Likes: 103

From: Lawrence, KS

Car: Met. Silver 85 IROC/Sold

Engine: 350 HO Deluxe (350ci/330hp)

Transmission: T-5 (Non-WC)

Axle/Gears: Limited Slip 3.23's

Re: heat riser-open or shut?

Quote:

Originally Posted by j.prince428

I'm doing away with all my emissions and obd in my 83 z28. Just one question. Is the butterfly in the heat riser open or closed with no vacuum to it?

Open. You can remove the butterfly or simply replace the whole business with a spacer from a TPI car.

JamesC

Last edited by JamesC; Feb 12, 2011 at 11:21 AM.

Old

Feb 12, 2011 | 12:26 PM

#3

Thread Starter

Junior Member

Joined: Mar 2009

Posts: 37

Likes: 0

Car: 1983 Z28

Engine: 5.7

Transmission: T5

Axle/Gears: UNKNOWN

Re: heat riser-open or shut?

So leaving it there not hooked up would work as well?

Old

Feb 12, 2011 | 01:57 PM

#4

Moderator

iTrader: (5)

Joined: Aug 1999

Posts: 19,282

Likes: 103

From: Lawrence, KS

Car: Met. Silver 85 IROC/Sold

Engine: 350 HO Deluxe (350ci/330hp)

Transmission: T-5 (Non-WC)

Axle/Gears: Limited Slip 3.23's

Re: heat riser-open or shut?

Quote:

Originally Posted by j.prince428

So leaving it there not hooked up would work as well?

I'd be surprised if it's not frozen open or partially open at this point. Might be worth a look.

JamesC

Last edited by JamesC; Feb 12, 2011 at 02:11 PM.

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