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Old 01-12-2009, 07:50 PM
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Default big block heads
will 73 big block heads 990's fit on a 1990 454 SS truck motor?
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Old 01-12-2009, 07:52 PM
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Yesir
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Old 01-12-2009, 08:16 PM
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your 100% sure right.
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Old 01-12-2009, 08:20 PM
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Yup, only thing is the early heads didn't have hardened valve seats, for unleaded gas
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Old 01-12-2009, 08:21 PM
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thanks
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Old 01-12-2009, 11:34 PM
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A set of L29 Vortec heads (oval port) would flow much better. I see them available sometimes in auctions or on Craigslist.
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Old 03-28-2009, 12:58 AM
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They will bolt on and work, but I seem to remember the 990's being a rectangle port intake design. The 1990 SS heads are the round 'peanut port' design. You will have to come up with the right intake!!
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Old 03-28-2009, 02:08 AM
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The 1990 Big Block is a Gen-V block and has parallel coolant flow instead of series flow like the Mark-IV blocks. It would probably be wise to research this somewhat before doing this, I don't think the Gen-V BBC has enough coolant passage in the back for series flow.
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Old 03-28-2009, 07:43 AM
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Originally Posted by Mangled03gmc
Yup, only thing is the early heads didn't have hardened valve seats, for unleaded gas
What year did the General start using hardened seats?
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