Rear steam on l92 heads
still in the works (installed crossovers, but haven't plumbed the rear crossover to the front yet), but used 12605716 for the rear crossover (07+ L92), but should get some more photos of the car this week as I get some more work done on the swap
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So these pre plugged heads from the factory must be side specific hey?? One must be meant for the left side and one meant for the right. Something to watch out for if you take your heads off or whatever.
I did that on a 56 chevy for a friend.. I (well, he, at my suggestion) then milled his valley cover to fit a semi flattened tube down it, so it remained hidden as well.
we also did the front a little custom, but not blingy, so it looked OEM, and made it go into the waterpump. (drilled and tapped that as well)
came out very clean.
its not my car, so I cant just go take pics.. if im not mistaken, the car is for sale in Charlotte, NC now.
the area is where the upper radiator hose goes.
i just did a quick search and found some pics of someone else doing it:
https://ls1tech.com/forums/generatio...crossover.html
do NOT do it like that guy did.. the throttlebody cam will hit it.
instead, take the waterpump off the engine, and drill the BACK side of that upper boss. then tap it for whatever fitting you want to use.
the area is where the upper radiator hose goes.
i just did a quick search and found some pics of someone else doing it:
https://ls1tech.com/forums/generatio...crossover.html
do NOT do it like that guy did.. the throttlebody cam will hit it.
instead, take the waterpump off the engine, and drill the BACK side of that upper boss. then tap it for whatever fitting you want to use.
1. if your conversion tilts the motor at all so that the front of the engine is no longer the high point, you may need rear vents for air pocket protection.
2. if you have a max effort motor and want closer combustion chamber temps across the engine.
thats all i can think of.
really when we did it on his car, it was because of air pocket worries. the engine wasnt tilted higher in the front at all....
notice all trucks have the rears blocked... but the early LS1 cars use all 4.
do I think it causes uneven cylinder temps? yes.
do I think the temps are uneven enough to cause an issue on a normal street car? no. On a really HO engine build? maybe.
do I consider myself an expert on the subject.. no.