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Old 12-26-2019, 03:33 PM
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SD421 SD421 is offline
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Default When A Crack In The Manifold Really Matters

Hi,
How serious is having a couple of cracks where they usually appear on a 1966 tripower manifold?
When do you need to replace the manifold?

Thanks,
Don

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1966 GTO

1966 421-9.3-1 comp-Race Tec 23cc Pistons
1966 Tri-Power
1967 670 Heads
Pontiac "Highlift" TriPower Cam by SpeedPro
DUR 214 Int 224 Exh @.050 - 107 ICL
LIFT .445" Int .465" Exh
Tri-Y-Headers by Tribal Tubes w/ Goerlich Mufflers
1966 Muncie Wide Ratio 4-Speed
1968-72 Chevy 12 Bolt Rear End w/ 3.73 rear gears
  #2  
Old 12-27-2019, 11:32 PM
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Dick Boneske Dick Boneske is offline
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Default

It depends on where the cracks are and how much leakage you have. They usually crack at the heat riser passage. If you have that blocked, it's a non-issue. If in the water crossover, coolant leakage would not be acceptable--but they rarely crack there.

If the cracks are in the runners, vacuum leaks will affect idle, and need to be fixed. Welding or epoxy are two options.

A used '66 intake is about $300-400. An aluminum repro costs about the same, but they have quality issues so you would need to do a careful inspection before using.
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