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The D16A1 is the USDM motor in the generation 1 integra. Its rated at 113hp for 86-87 and 118hp for 88-89. The JDM DOHC ZC is rated at 130HP. They are virtually the same motor minus a few differences, really the head. The camshafts have a slightly higher lift duration which accounts for the 12hp difference along with the factory 4-2-1 headers. The bolts on the valve cover are located on the outside versus the inside.

The USDM D16A1:


http://www.angelfire.com/nj3/chaos325/enginepics/d16a1.jpg

The JDM DOHC ZC:

Code:
Code:

http://www.angelfire.com/nj3/chaos325/enginepics/zc.jpg

I just tracked down and swapped over the headers and camshafts.
 

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Chaos325 said:
The D16A1 is the USDM motor in the generation 1 integra. Its rated at 113hp for 86-87 and 118hp for 88-89. The JDM DOHC ZC is rated at 130HP. They are virtually the same motor minus a few differences, really the head. The camshafts have a slightly higher lift duration which accounts for the 12hp difference along with the factory 4-2-1 headers. The bolts on the valve cover are located on the outside versus the inside.

The USDM D16A1:


http://www.angelfire.com/nj3/chaos325/enginepics/d16a1.jpg

The JDM DOHC ZC:

Code:
Code:

http://www.angelfire.com/nj3/chaos325/enginepics/zc.jpg

I just tracked down and swapped over the headers and camshafts.
These motors may be similar but will NOT fit in the same car.
D16a1 will fit 84-87 Civic/CRX
JDM DOHC ZC will fit 88-91 Civic/CRX
JDM DOHC ZC will also fit 92-00 with wiring changes and a different dizzy.

The mounts, tranny and axles from these motors are different, making it very difficult to swap them into the wrong years of cars.
 

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This one's for you, Duck.
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Yup, the civic ZCs have the VC bolts closer to the plug holes. The integra ZCs have them along the outside of the VC
 
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brown top ZC or d16a1 will fit in a 84-87 civic/crx

black top ZC or d16a1 will fit in 88-91 civic/crx
 

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zc87crx said:
brown top ZC or d16a1 will fit in a 84-87 civic/crx

black top ZC or d16a1 will fit in 88-91 civic/crx

wrong..any d16a1 will fit into an 84-87 crx/civic whether its a black (88-89 teg motor) or brown top (86-87 teg motor). these will not fit into 88-91 crx/civics.
the 1g browntop zc will fit into 84-87 crx/civics, the 2g jdm zcs will only fit the 88-91's. the parts are mostly interchangeable..mostly all but the blocks.
 

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all integra ZC and d16a1's have the valve cover bolts on the inside.....

Civic zc's have them on ythe outside and do not bolt onto the 86-89 integras..


86-87 integras need a browntop Zc with only come one way....These happen to also bolt into the g1 Crx's and g3 civics.....
 
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