Fast intake and coolant crossover
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I got same thing but use the truck 2port crossover in rear and ls6 in front.
Connect them with brass t. Parts store rad.overflow tubing.
Problem solved.
Just a tip for the valley plate cover and fast intake.
I took a countersink to the plate and tapped the m8 threads in block for 5\16-24.
I got the countersink allen bolts for about .20¢ each.
Not all the bolts need it. Just the ones interfering with intake body.
I spent less than 5$. And didnt pay for the fast button heads.
Done it for few other folks who bought intakes without bolts.
Can also use 5/16-24 button heads, if not countersunk bolts
Thr m8x1.25 pitch is very close to the 5/16-24.
Mine been on for 6yr and been on different engines
In my car.








