Intake manifold 390
#1
Intake manifold 390
I hail from the world of inline 4-bangers (have an 88 Merkur XR4Ti as my go fast project) and this cam-in-block V8 world is a bit new to me.
Been re-sealing the 390 in my 75 F250 and it came time to put the intake manifold back on (jeez its heavy...). I put silicone in the 4 corners of the valley where the cork meets the composite gaskets (both on top of and under the cork in that corner) and then put the manifold on and torque things down. I noticed the cork towards the middle of the front and back of the engine squeezing out a bit far. Loosened the bolts up enough to tuck it back under and torqued things down again. Seemed to stay in place this time so I just left it. Is this typical or is my installation procedure flawed in some way?
Been re-sealing the 390 in my 75 F250 and it came time to put the intake manifold back on (jeez its heavy...). I put silicone in the 4 corners of the valley where the cork meets the composite gaskets (both on top of and under the cork in that corner) and then put the manifold on and torque things down. I noticed the cork towards the middle of the front and back of the engine squeezing out a bit far. Loosened the bolts up enough to tuck it back under and torqued things down again. Seemed to stay in place this time so I just left it. Is this typical or is my installation procedure flawed in some way?
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That works too... letting the RTV outgas for a bit lets it become firm and less prone to squirm out. Still, repeat heat cycles and age tends to dry out the cork making it brittle and more prone to leaking.
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