[quote="swampedge"]The radiator is an aluminum 28” crossflow I used in my 454 build several years ago. My passenger side exhaust manifold flange touches the heat shield so I will modify that area and my valve cover is better than an inch off of the firewall. I center my engines off of the radiator with the shroud in place measuring side to side the fan from face of radiator and equal distance in the shroud to fan tip. Level across the top and 8* down the Buick 350’s are 7* down.
I’ve installed a factory Buick 350 radiator and reproduction shroud. The engine could be moved 2” further forward so that half of the LS fan would be in the shroud but the fan clutch would only be 1/4” away from the radiator.
You can see shiny areas above each bolt hole. Those bosses were removed so I could clock the transfer case up and even though this is a passengers side drop it required a drivers side drop clocking ring.
I made this tool from a lawn mower trailer hitch ball. Cut the stem and drilled a hole and welded it to an air chisel arbor. I needed to clearance the floor pan under the passengers seat a bit so this planished it nicely. Lot better than a three pound hammer.
This is how high the output is so that it clears the factory cross member.
The truck is getting a four inch lift so the shaft should clear fine.
You can see the output in the above pic. The front differential housing is in the front of the pic.
More pics of firewall clearance in relation to exhaust manifolds
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Below is heat shield clearance to front output flange, you may have to trim this to clock the transfer case high enough, I did.
Next image shows transmission spacer.
Next image is the load spreader required as one hole you have to drill opens up edge of large dowel hole in middle of cross member. I think that large hole is there to locate cross member in the die that shapes the cross member.