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Old 12-12-2016, 06:56 PM
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HawkX66 HawkX66 is offline
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Default Well, this sux. So much for my 502...

As usual, a deal that is too good to be true is... So there were a few things that weren't adding up on my new motor after I pulled the cam to replace it with a cam with a fuel pump lobe. I decided to pull a head to verify a few things for myself and not trust what the builder told my friend. It turns out, everything internal is basically stock GM otc rebuild truck crap. 2.09/1.72 valves, not 2.19/1.88. The cam lift I measured to be ~.462/.462. Yes, that's after multiplying it by the 1.7 rocker ratio... Stock 4.250 stroke so it's a 494ci, not a 502 or 508. I'm out of my mind right now. I do believe my friend didn't know. I'm ready to give the whole thing back, but he offered to set me up with some good aluminum heads and a brand new Howard or Lunati cam of my choice from the "builder". The lower end all looks brand new and it's a seriously beefy 4 bolt main, 489ci. .020 over.
The only thing I'm worried about is that I have flat top pistons. Most aluminum heads have 110-120cc chamber volume. I don't think that would work with flat tops no matter their volume for compression would it?
Considering it's "only" $2,500 for what will end up being a good motor with a little more of my labor, what would you do? I'm thinking the smart thing to do is give them a chance to make it right. What about the pistons though?

Current pistons:



New double roller:

<a href="https://flic.kr/p/NT1KYv" rel="nofollow" target="_blank">

Lower end:

[url=https://flic.kr/p/Nj4zV6]</a>
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