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So I got about everything I need to topswap my l36 just need the crank and the main wire harness but to hook up the l67 fuel rail am I gonna need the lines that came off the donor car? Or will it hook up to my existing ones ? I tried searching to see what other people did I couldn’t find nothing. Also, does anyone know if the rocker arms and pushrods are interchangeable on the l36 and l67?
 

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The fuel lines will need modifications. The ends are the same size and type but join the rail at a different angle.
The rocker arms and pushrods are the same from each engine but now is a good time for some 1.9’s unless you plan to change the cam shaft later on.
 

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The fuel lines can be tricky to make them line up with an L67 rail. I've had a couple that carefully permitted a smooth re-connection, while I've also used the Dorman kits from the parts store to change to a straight end with ~12" of new line. Important thing to get right for safety, so take your time and make sure it's a clean install with whatever you do (can even get fancy and go -6AN braided stainless adapted to the hard lines near the frame, with GM fittings up top, if you want).
 
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So I got about everything I need to topswap my l36 just need the crank and the main wire harness but to hook up the l67 fuel rail am I gonna need the lines that came off the donor car? Or will it hook up to my existing ones ? I tried searching to see what other people did I couldn’t find nothing. Also, does anyone know if the rocker arms and pushrods are interchangeable on the l36 and l67?
Crank should b the same lines id go aftermarket rails if u got it 2 spend that way u gain 3/4" in height 4 if u decide to IC later on..
 

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I think he means "crank pulley" (harmonic balancer) for the L67 SC belt drive.

Aftermarket rails are a great suggestion, if you have $300-400 (or get lucky and find used for sale, like I did a few years ago). If ZZP isn't in stock, the Aeromotive rails seem decent to build off of, but you'll need to setup your own lines and regulator.
https://www.jegs.com/i/Aeromotive/027/14131/10002/-1
 

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So I got about everything I need to topswap my l36 just need the crank and the main wire harness but to hook up the l67 fuel rail am I gonna need the lines that came off the donor car? Or will it hook up to my existing ones ? I tried searching to see what other people did I couldn’t find nothing. Also, does anyone know if the rocker arms and pushrods are interchangeable on the l36 and l67?
The wiring harness for the L36 and L67 is identical except for one wire that goes to the BBV (boost bypass valve) . As for the fuel lines; Russell make an adapter end that clips right onto the rail. I use #6AN stainless braided line on mine
 
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