Author Topic: 69 L78 Heat Riser  (Read 449 times)

Bigfish45

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69 L78 Heat Riser
« on: June 05, 2021, 03:57:57 PM »
I'm getting ready to remove the headers and order all the parts to install exhaust manifolds on my L78 car. I would like to hear some of your opinions on the heat riser, because I'm undecided on whether to install one or not? Are there any pros or cons on having the heat riser in place? They make a spacer to go in it's place. I can remember having one on a BB 70 Chevelle back in high school and the thing rattled. Any advice would be appreciated. Thanks

x66 714

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Re: 69 L78 Heat Riser
« Reply #1 on: June 05, 2021, 04:22:22 PM »
My car has it's original. The car has 157k miles. I cleaned it really good & put it back in during restoration. Same with my smog....Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO. Purchased March 1976
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E. Purchased April 1981

bertfam

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Re: 69 L78 Heat Riser
« Reply #2 on: June 05, 2021, 05:26:21 PM »
Depends on where you live. If you're in an area that gets cold (or you plan on getting the car judged) you'll need it. If not, you can either get the spacer or an original riser and REMOVE THE FLAPPER.

Ed
Ed "Bert" Bertrand
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rich69rs

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Re: 69 L78 Heat Riser
« Reply #3 on: June 05, 2021, 08:46:50 PM »
The main points have been covered.  I had bad luck with current product offerings  getting stuck in a relatively short time.  I replaced mine with a spacer.  If you go with a spacer or remove the flapper, you’ll probably need to let the car warm up some (15-30 secs or so) if it is cold . 

Throwing my heat riser out in the snow was one of the best reliability improvements I made - judging considerations were not an issue for me.

Richard
Richard Thomas
1969 RS

BillOhio

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Re: 69 L78 Heat Riser
« Reply #4 on: June 07, 2021, 12:54:33 PM »
I cut the flap off my Z and left the rod.  Looks right but nothing in there.  spacer probably cheaper tho
1969 Z28, Burgandy, numbers matching, 12,900 miles
1968 RS 327 4 speed
1967 Plymouth GTX Hemi, 4 speed, dana
1961 Chrysler 300G convertible