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I'm No Expert
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Discussion Starter #1
Buddy of mine found a guy selling a complete 454 needing a rebuild. He paid 700 for it and it came with a decient set of cobra OT jetboat headers... The headers look simular to the non-twist bassets, actually they have the same sleek back look that the twistys have but with out the twist. Anyway, the block is 2 bolt main which i wasnt too thrilled about but i know others have talked about making huge hp numbers on two bolt mains and he's just going to build somthing mild, my guess 300 to 400 hp range. One advantage was the heads are 049's! I'm thinking he got a pretty good deal now. This is where i'm confused though... i measured the bore and i'm getting 4.247 which is weird because shouldnt the stock bore be 4.250? Are my tools or retarded (cant be me :D )?
 

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It's what we do
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It is a stock bore. I don't think it matters at this point what measurement you get as he is going to rebuild it. I would assume he is going to get new pistons, probably .030 over, so the important thing is measuring the new pistons and specifying the new bore diameter.
New pistons gives him the ability to truley have the correct piston to wall clearance and a long service life with the heart of the engine. He has no history of what abuse this engine has seen before he bought it.... such as overheating, over reving, etc. If he is going to spend the money to rebuild it, don't cut corners by using the old pistons.
 

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I'm No Expert
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Discussion Starter #8
It is a stock bore. I don't think it matters at this point what measurement you get as he is going to rebuild it. I would assume he is going to get new pistons, probably .030 over, so the important thing is measuring the new pistons and specifying the new bore diameter.
New pistons gives him the ability to truley have the correct piston to wall clearance and a long service life with the heart of the engine. He has no history of what abuse this engine has seen before he bought it.... such as overheating, over reving, etc. If he is going to spend the money to rebuild it, don't cut corners by using the old pistons.
no, He's going to get new pistons and it's going to be bored over, but if my measurement of the bore is wrong and he buys .030 over pistons and the bore is really already .060 over that's going to suck. It's going to go to a machinest so he could tell me for sure obviously but i want to make sure this block hasnt reached it's max bore... pointless to drag a block to the machinest for nothing.
 

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I'm No Expert
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Discussion Starter #9
If you have a 4-5" micrometer, you can calibrate the dial bore gauge against it.
I dont have a micrometer that big, i'm kinda thinking what i'm getting is correct though considering i meausred with both the dial bore guage and my caliper and the difference was only .001 (caliper measured the top of the bore..)
 

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4.250 is a standard bore for a 454. It has not been bored.
 
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