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Old 02-06-2020, 09:12 PM   #1
Vanspeed
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Default Domed aluminum 21 stud heads

I have a set of the aluminum heads with waterpump mount for the 21 stud and they are for flat pistons. I think they are 34-35? what years did they make them for domed pistons? I have seen them but not sure of the years. I would like them for my ‘36 LB engine but seem to be coming up empty with answers.
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Old 02-06-2020, 09:52 PM   #2
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Default Re: Domed aluminum 21 stud heads

48 and 68 prefix heads are for domed pistons, 40 prefix is for flat pistons.
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Old 02-06-2020, 09:52 PM   #3
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Default Re: Domed aluminum 21 stud heads

Both 48- and 68-prefix aluminum heads are for use with domed pistons. The numerous varieties of 40- prefix heads are for use with flat top pistons.
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Old 02-06-2020, 10:07 PM   #4
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Default Re: Domed aluminum 21 stud heads

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Thanks guys. I am in need of a set and now I know what to look for.
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