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#1
01-16-2023, 06:56 PM
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New engine
I'm into a 72 Grand Prix with a freshly built 71 455. Intake was leaking at the exhaust crossover. Pulled the intake to replace the gaskets and get it sitting correctly. Only one bolt torqued. The man that built the engine has since retired and was a professional engine builder. I can't believe that he missed the cracks in this head, casting 66. Owner dropped off a pair of 96's this morning that I'm going to have rebuilt to go on the 456.
I've gotten used to go behind other shops work to correct things.
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1971 GTO,72 400, stock bottom end, 670 heads, Lunati BMII cam, headers, iron intake Q-jet, four speed. Best 60 ft 1.806in 2004. Best 1/8th mile e.t. 8.46 with 3.55 open rear 85 Grand Prix, 70 400, casting 62 heads stock rebuild, Turbo 350 trans 78 800 cfm Q-jet modified as per Cliff Ruggles book. 87 F350 6.9 4 speed dually A poor man has poor ways. |
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#2
01-16-2023, 07:03 PM
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What you’re seeing is normal, it’s simply the parting line where the two halves of the mold come together. It’s quite common actually.
Those are not cracks, your heads don’t need to be replaced. Just use a small dab of ultra grey sealer to prevent oil from migrating into the intake ports.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#3
01-16-2023, 07:13 PM
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That one runs clear to the pushrod tube. One port (I tried to get it in the picture) had been welded. The other head is perfect.
__________________
1971 GTO,72 400, stock bottom end, 670 heads, Lunati BMII cam, headers, iron intake Q-jet, four speed. Best 60 ft 1.806in 2004. Best 1/8th mile e.t. 8.46 with 3.55 open rear 85 Grand Prix, 70 400, casting 62 heads stock rebuild, Turbo 350 trans 78 800 cfm Q-jet modified as per Cliff Ruggles book. 87 F350 6.9 4 speed dually A poor man has poor ways. |
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#4
01-16-2023, 07:14 PM
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No matter what the 96 heads will wake up that 455 with a nice 1-point bump in compression.
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#5
01-16-2023, 07:22 PM
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Quote:
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“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell |
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#6
01-16-2023, 07:58 PM
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Quote:
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