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#1
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1968 Z28 cowl plenum smog tubes
Were smog tubes on a cowl plenum car the same as on a open element breather car?
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1968 LOS Rallye Green Z28 |
#2
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Re: 1968 Z28 cowl plenum smog tubes
The drivers side is but the passenger side takes a hard turn to the front on the engine to miss the bottom of the air cleaner.
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1967 Nova SS L30 1967 Chevelle L79 1969 RS Z/28 Red 1969 RS Z/28 Lemans Blue 1970 Z/28 Blue 1967 RS Convertible 1968 Camaro SS 1992 GMC Yukon 30166 miles |
#3
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Re: 1968 Z28 cowl plenum smog tubes
Use the original tube,but replace the rubber hose with a 90 degree bend. John p.s. That is what I plan to do when the time comes.
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#4
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Re: 1968 Z28 cowl plenum smog tubes
That sounds like a good idea,I have been told a certain Nova smog tube will work but just more money
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1968 LOS Rallye Green Z28 |
#5
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Re: 1968 Z28 cowl plenum smog tubes
The tube will still hit the bottom side of the breather, been their and done that, be better to get a different tube.
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1967 Nova SS L30 1967 Chevelle L79 1969 RS Z/28 Red 1969 RS Z/28 Lemans Blue 1970 Z/28 Blue 1967 RS Convertible 1968 Camaro SS 1992 GMC Yukon 30166 miles |
#6
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Re: 1968 Z28 cowl plenum smog tubes
If you use a 69 pass side tube it bends 90 deg before the valve screw on. Not correct (obviously) however it should work.
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~JAG~ NCRS#65120 68 GTO HO 4 spd Alpine Blue /Parchment 2 owner car #21783 71 Corvette LT1 45k miles Orig paint - Brandshatch Green - National Top Flight - last known 71 LT1 built. 71 Corvette LT1 42k miles Original paint - Black - black leather - only black LT1 known to exist. NUMEROUS Lemans blue Camaros, Monza Red and Daytona Yellow Corvettes & a Chevelle or two... Survivors, restored cars, & other photos https://picasaweb.google.com/lh/myphotos |
#7
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Re: 1968 Z28 cowl plenum smog tubes
I can not hink why GM would not have made a camaro specific one for this application
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1968 LOS Rallye Green Z28 |
#8
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Re: 1968 Z28 cowl plenum smog tubes
Im still learning but I would think the tube would be the same. The cowl plenum was an over the counter piece/ dealer installed and did'nt come with a smog tube. They probably assumed if you installed the cowl plenum setup you would also buy headers, therefore no interference with the smog tubes.
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#9
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Re: 1968 Z28 cowl plenum smog tubes
Plan b shorten the tube.Then the check valve will be lower. Send it to Bill and have it replated. John
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#10
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Re: 1968 Z28 cowl plenum smog tubes
I have a set of smog tubes that I acquired from Jerry MacNeish years ago. The passenger side tube is rare and built specifically for the Cowl Plenum installation.The passenger side tube sweeps 90 degreees in the direction of the tube itself pointing to the smog pump. It also starts its sweep at the firewall end of the tube to allow room for the hose to connect to the smog pump The drivers side is the same.
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