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Old April 11th, 2006, 02:03 PM   #7
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Are these Alum. or cast heads???

If alum, ignore the rest

If they are cast and you have a true 10.5:1, you will have to pull some timing.

That is too much compression for pump gas and cast heads, especialy if those are reworked stock heads, they have a poor combustion chamber design are prone to detionation.

You can try some colder plugs, set timing too about 30-32 total and add a little fuel.

Good luck,

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