 Engine Compatibility? |
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| VWTortuga336 |
 Dec 19 2014, 07:44 AM
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#1
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Member  Group: Members Posts: 285 Joined: 5-October 14 From: Kansas City, Missouri Member No.: 17,979 Region Association: None  |
I think I know the answer to this, but I want to confirm before I make a purchase - are engines interchangable between years? I know there are displacement differences, compression differences, etc. I'm wondering about fitting a later engine into an earlier car.
Specifically, will a GC code from a '75 fit in my '74? |
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| 76-914 |
Dec 19 2014, 07:56 AM
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#2
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,490 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California 
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Yes and yes.
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| Mark Henry |
Dec 19 2014, 09:04 AM
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#3
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Not much difference, GC often have smog holes in the heads that need to be plugged, '75-76 exhaust sucks so backdate with -'74.
Any used runner /4 engine check the exhaust studs for damage. |
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| VWTortuga336 |
Dec 19 2014, 09:13 AM
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#4
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Member Group: Members Posts: 285 Joined: 5-October 14 From: Kansas City, Missouri Member No.: 17,979 Region Association: None |
Thanks for the info. I'll be using the exhaust setup that came off my thrashed '74 engine.
Are the exhaust studs difficult to replace? What do the smog holes need to be plugged with? |
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| bandjoey |
Dec 19 2014, 09:32 AM
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#5
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bandjoey Group: Members Posts: 4,923 Joined: 26-September 07 From: Bedford Tx Member No.: 8,156 Region Association: Southwest Region |
The exhaust might not fit. I think it's 1.8 and 2.0 that r the same. 1.7 different. I know someone more knowledgable will confirm or correct.
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| SLITS |
Dec 19 2014, 09:35 AM
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#6
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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  |
QUOTE(VWTortuga336 @ Dec 19 2014, 07:13 AM)  Are the exhaust studs difficult to replace? What do the smog holes need to be plugged with? If the injector tubes are still in the head, you can use a 3/8" NPT pipe cap. I forget the thread pitch on them, but a bolt can be screwed into them. Remember, they go into the exhaust port so you don't want it sticking into the stream very far. Last method is to have them welded from the inside. |
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| mepstein |
Dec 19 2014, 10:08 AM
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#7
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914-6 GT in waiting Group: Members Posts: 19,238 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(bandjoey @ Dec 19 2014, 10:32 AM) The exhaust might not fit. I think it's 1.8 and 2.0 that r the same. 1.7 different. I know someone more knowledgable will confirm or correct. 1.7 / 1.8 are the same. 2.0 differes. Use the heat exchangers with correct muffler and either one will work. They must be used as a pair. |
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| stevegm |
Dec 19 2014, 10:42 AM
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#8
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Advanced Member Group: Members Posts: 2,111 Joined: 14-July 14 From: North Carolina Member No.: 17,633 Region Association: South East States
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QUOTE(mepstein @ Dec 19 2014, 11:08 AM) QUOTE(bandjoey @ Dec 19 2014, 10:32 AM) The exhaust might not fit. I think it's 1.8 and 2.0 that r the same. 1.7 different. I know someone more knowledgable will confirm or correct. 1.7 / 1.8 are the same. 2.0 differes. Use the heat exchangers with correct muffler and either one will work. They must be used as a pair. I concur. The 2.0 heat exchangers are straight, whereas the others curve up a little. Therefore, you have to use 2.0 heat exchangers with a 2.0 exhaust. I have a few sets of 2.0 heat exchangers if you need them. I don't think I have a 2.0 muffler. |
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