How much HP can 454 block handle?
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How much HP can 454 block handle?

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    Senior Member jrider44's Avatar
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    Default How much HP can 454 block handle?

    I want to build a blown 496. I have a stock 454ci 4 bolt main block. How much horsepower can this block handle and be reliable, considering I use quality internals?
    1978 Hawaiian Party Cruiser
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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by jrider44 View Post
    I want to build a blown 496. I have a stock 454ci 4 bolt main block. How much horsepower can this block handle and be reliable, considering I use quality internals?
    Are you thinking pump gas or blown nitro?

    I ran a GM truck (tall deck) block .100" over bore, 4.250" stroke, 505 cubic inches, with 15 psi boost for 6 years in a ski race boat,,, took it apart, inspected everything, honed the block and put it back together with new rings and bearings. At that boost level, it may have been around 1000 HP.

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    Senior Member jrider44's Avatar
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    Blown pump gas for my 26' Hawaiian party cruiser. I would like about 700 horse. It's not a race boat, but like most of us I love to run hard once in a while
    1978 Hawaiian Party Cruiser
    Stevens V-drive(sold to bbollig55)
    Spico V-drive

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    Senior Member CNC BLOCKS's Avatar
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    On OEM blocks its best to sonic test the cylinders before anything is done to make sure you have a good foundation to start with.

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    Senior Member jimclauss's Avatar
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    Quote Originally Posted by jrider44 View Post
    I want to build a blown 496. I have a stock 454ci 4 bolt main block. How much horsepower can this block handle and be reliable, considering I use quality internals?
    Race or pleasure boat?

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    Led
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    some say 1000ish is pushing the limits, others will have experiences with more hp that will last for years, u will be fine, IMO the block failure can be determined by the quality of guts inside it, and appropriate installation.

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    steelcomp was here
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    Quote Originally Posted by jrider44 View Post
    Blown pump gas for my 26' Hawaiian party cruiser. I would like about 700 horse. It's not a race boat, but like most of us I love to run hard once in a while
    700hp, 6500rpm, decent parts, the block is fine. If it's a two bolt, I'd invest in a set of studs.
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    Senior Member tkriley13's Avatar
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    My first blown motor was a .030 over 454 block (461) it went 12 years and almost 400 hours of beating the crap out of it.. cylinder wall started to spilt my first season racing and by the end of the season it splitted the whole way and even the good crank,2 rods,2 pistons inside couldnt take a cylinder full of ming water...
    I just wish I knew what I know now cause I may have been able to save the old girl instead of taking her to the dump... BTW - I ran 15Ibs of boost and 35 degrees of timming all the time and everything else looked great except the damaged area..
    I think their fine to use if you have a good core but machine work will cost $1000.00 bucks or so if you dont have a good 4 bolt main core its better to add a little more money and get something better..IMO

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