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OK, this is a good one. Here's my dilemma.

302 Roller block with a 1968 timing cover and water pump. Every time I spin the motor to 7,000 it blows out the back gasket of the water pump.

Here's what I have done.

1. Verified the timing cover is NOT warped.
2. Replaced pump 3 times.
3. Using the correct silicone to seal the gaskets.
4. Torqued bolts to specs

Anyone had a simular issue?

Some workarounds that I have thought of are underdrive pulleys or changing to a "BOSS 302" style pump and radiator.
 
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