 backdate 76 GC heads to 73-74 GA or GB heads |
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| SuperDave |
 Mar 3 2009, 12:09 PM
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#1
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Newbie  Group: Members Posts: 5 Joined: 6-January 09 From: Oklahoma City area Member No.: 9,907 Region Association: Southwest Region  |
I'm a newbie here. I've tried searching pelican and here to no avail. My apologies if this has been covered before...
I am very close to buying a 76 2.0 to replace the 1.7 in my 72. The 2.0 still has the original heads and emissions equipment. I've read enough to know the emissions equipment made the car run hotter and less efficiently and my state (Oklahoma) doesn't require it so I'm planning on removing the air injection. Three questions: Are 73-74 heads a bolt-on for the GC engine? If so, would I gain anything by replacing my 76 heads with GA/GB heads or should I just fill in the holes like was discussed in a recent thread? I've heard the valve sizes are different between 73-74 and 75-76 heads, but haven't been able to verify this. True or false? Thanks! David |
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| SLITS |
Mar 3 2009, 12:36 PM
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
Nothing I have seen or read indicates any valve size difference on the 2.0 heads.
Only difference I know of is the lack of breather ports and the addition of air injection holes in the exhaust ports. Air injection holes can be plugged or welded up. Breather ports can be added as the boss is still cast into the heads. I've swapped them back an forth. In other words , save your money and work with the late heads. Now, there is a big difference between 2.0L BUS heads and 2.0L 914 heads. |
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| SirAndy |
Mar 3 2009, 12:40 PM
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#3
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Resident German Group: Admin Posts: 41,675 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(SLITS @ Mar 3 2009, 10:36 AM)  Nothing I have seen or read indicates any valve size difference on the 2.0 heads. Only difference I know of is the lack of breather ports and the addition of air injection holes in the exhaust ports. Air injection holes can be plugged or welded up. Breather ports can be added as the boss is still cast into the heads. I've swapped them back an forth. In other words , save your money and work with the late heads. Now, there is a big difference between 2.0L BUS heads and 2.0L 914 heads. (IMG:style_emoticons/default/agree.gif) with Schlitz ... PS: (IMG:style_emoticons/default/welcome.png) |
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Posts in this topic
SuperDave backdate 76 GC heads to 73-74 GA or GB heads Mar 3 2009, 12:09 PM
SuperDave Dang, that was fast! Thanks....
I knew about ... Mar 3 2009, 01:10 PM type47 Breather ports are little pipes that allow relief ... Mar 3 2009, 02:18 PM SirAndy Btw. some people have had success by adding a port... Mar 3 2009, 02:23 PM r_towle No one has explained why some have the head breath... Mar 3 2009, 02:58 PM
SirAndy
No one has explained why some have the head breat... Mar 3 2009, 03:07 PM SuperDave
[quote name='r_towle' post='1140879' date='Mar 3 ... Mar 3 2009, 04:23 PM hcdmueller L-Jet cars don't have them. The breather syst... Mar 3 2009, 04:23 PM type47
L-Jet cars don't have them.
hmmm, my ... Mar 4 2009, 09:07 AM Bleyseng :agree: Mar 3 2009, 07:27 PM wertygrog how can one tell the difference between 2.0L bus a... Mar 3 2009, 08:09 PM bobhasissues
how can one tell the difference between 2.0L bus ... Mar 3 2009, 08:49 PM hcdmueller
L-Jet cars don't have them.
hmmm, my ... Mar 4 2009, 03:23 PM SuperDave
[quote name='type47' post='1141175' date='Mar 4 2... Mar 4 2009, 10:12 PM |
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