Sonic test or buy cheap block?
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Freshman User
Joined: Nov 2008
Posts: 28
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Sonic test or buy cheap block?
I have a block that is bored to 4.13. I'm guessing I will have to bore the block to rebuild it. I do not know if it originally was a 390 or 428 (see my last thread) I did the drill bit test and it's 15/64. That seems to be in between a 390 and 428. I have a 428 crank that is 30/20 under so I would assume the block has been bored over. All the parts seem to be from different years so who knows what is original or machined. Should I pay the $125 to sonic test or buy a 390 for $50-$75 and hope its usable?
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
You are giving up a lot of cubic inches going back to the 4.05" bore from the 428 bore of 4.03". I would spend the money on the sonic map, but then I never took the cheap route when I built my motors.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Regardless of what anyone here says, you will find a way to justify whatever you want to do, which appears to be go with the cheap block and gamble that it is good. My brother was always doing it that way and it seemed to always cost him more in the long run. Just remember, "there is no replacement for displacement" especially with a street motor.
FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
Likes: 4
From: Smith Mountain Lake, VA
Why do you think you'll have to bore the block ? Does it have grooves in the cylinder's ? Or a Big Ring ridge ? If None of the above, Check the bores for Being out of round and taper, you may get away with just a hone? If there isnt anything you cam hang a finger nail on you maybe good for just a hone and go ??
Does the block you have now, Have the extra webbing in the crank saddle ? I'd try and work with the block you have....even if you pick up a known 390 block, Its going to have to go to the Machine shop anyway, and before they touch it, It'll have to be cleaned, Magged for cracks, and spec'd...anyway !! JMO, and good luck !
~RJ
Does the block you have now, Have the extra webbing in the crank saddle ? I'd try and work with the block you have....even if you pick up a known 390 block, Its going to have to go to the Machine shop anyway, and before they touch it, It'll have to be cleaned, Magged for cracks, and spec'd...anyway !! JMO, and good luck !
~RJ
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