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12-02-2013, 03:01 AM
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#13 |
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Member
Join Date: Nov 2005
Location: cloquet mn
Posts: 467
Likes: 17
Liked 68 Times in 31 Posts
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Re: 487 vs. 487x heads
487/487x and 993 are all based on the same
Casting group, that is why some have dual Numbers top and bottom. As far as flow I have Seen more of a difference between individual Castings than between casting numbers, have Seen good and bad 487 or 993 just depends On the casting more than the number.
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Ron Mattson 5015 STK |
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