? Maximum Bore 454 Bow Tie Block

Old 02-03-2009, 08:15 PM
  #1  
ashbros
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Default ? Maximum Bore 454 Bow Tie Block

I have a Mark IV Bowtie Block 454 Hy Per Series 9.8000 Deck
Numbers on Block are:10051107
4 Bolt Main
9.800 Deck Height
Siamesed Cylinders,

Anyone know what the Max Bore Size is on this block.
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Old 02-04-2009, 12:56 PM
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nofear57
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GM Performance Parts books say 4.500"
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Old 02-04-2009, 05:11 PM
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coloradoracerguy
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I had one that I bored to 4.600. Thinest cylinder wall after sonic check was .385". 4.625" is max safe.

Mark
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Old 02-04-2009, 07:23 PM
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hammertime
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Have on thats 4.625 thats limit
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Old 02-06-2009, 09:23 PM
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RonOwensRacing
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I don't think i would even try to take it out that far i had one and we bored it out to 4.460 and went thru on one cyld. and the four corners went to 4.500 .
so we went back sleeved them and i got another set of pistons and redone it .
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Old 02-07-2009, 01:26 AM
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Tod74
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Wow I think I'd sell it and get a Big M or Merlin that is already 4.5 then you have room for some rebuilds. JMO
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Old 02-08-2009, 08:37 AM
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fishmanjoe
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you will be taking away the shelf life of that sbc if you go boring it to the max.If I were you if you want big inches,go big block.FISHMANJOE
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Old 02-08-2009, 09:12 AM
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hammertime
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hmm a bit confused a gm bowtie block is used as much as dart/merlin around here for 540 + builds and tall decks are very common to use for 632s for ts/td guys. The block is good and less money then a dart.
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Old 02-08-2009, 09:34 AM
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Tod74
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Nevermind I misread the post. ops:
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Old 02-08-2009, 11:39 AM
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tcarda
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I have the same block and casting number, but mine started as a 502 and now it is a 540. How much hp can these Bowtie blocks handle?
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