427 vs 454 build up

Discussion in 'High Performance Modifications' started by theflash, Dec 14, 2004.

  1. theflash

    theflash Veteran Member Lifetime Gold Member

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    Feb 27, 2004
    Podunk, CT
    The dark side has been calling me for a long time. I'm thinking of builing one of the two. The goal is to get some killer horse power and maintain some street ability. The car will see the track maybe once a year, and then mostly cruise nights. This wont be a daily driver, but will be taken to work on a nice day.

    I'd like your opinions on which you would choose and how you would build it. I have always been partial to the 427 (just liked the way it sounds vs 454 for some reason). And that it is a faster, and higher reving motor. Hood clearance is not an issue, and I'd like to keep the budget within reason (no outrageous race parts). I plan on keeping my current drivetrain, with the exception of maybe a TH400. If need be, add a Currie 12 bolt or 9 inch to the wish list.

    One question about heads to start. I hear the AFR (not that I am set on these) SBC heads have raised exhaust ports, is this true with the BBC heads as well? Just considering header clearance. TIA
     
  2. Don't worry about the headers as much as the whole picture. [​IMG]

    The only thing that would sway me away from a 427 is the cost of the pistons being a bit more than 454 pieces. Other than that, everything else is the same, except the crank.

    Heads.....I hear lots of different things....so I guess its a pic and choose sorta thing. Edelbrocks are ok too from what I hear (cheaper than AFR's).
     
  3. Mike-78 Z-28

    Mike-78 Z-28 Veteran Member

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    Mar 4, 2003
    ElDorado Arkansas
    Depends on what block and crank you have to start with.If you don't have a crank go the 496 route and put the 427 stickers on it.If you have a 454 build it and see why they discontinued the 427.

    ------------------
    1978 Z-28 purchased new by me -$6750
    Click here to view present state photo
    Look above for glory days.
    1994 Formula
    1982 350 S-10
     
  4. ZS10

    ZS10 Moderator Lifetime Gold Member

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    Jan 18, 2003
    BC, Canada
    I built a 427 just for nostalgia. Those three numbers have been synonamus with with 'hi-perf' since they were first built.

    No disrespect to anyone, but 454 triggers the image of a rusted out, 8:1, 220 hp, half-ton truck. But, know that all other things being equal, inches wins.

    As far as higher revving, bah! Either way, just put the rev limiter to 6500 and hope your shorts stay clean.

    ------------------
    73RS/LT/427
     
  5. Mike-78 Z-28

    Mike-78 Z-28 Veteran Member

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    Mar 4, 2003
    ElDorado Arkansas
    You got that right!427 is no doubt a magic number.

    ------------------
    1978 Z-28 purchased new by me -$6750
    Click here to view present state photo
    Look above for glory days.
    1994 Formula
    1982 350 S-10
     
  6. craggar

    craggar Veteran Member

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    Jul 28, 1999
    edmonton
    I'm another who likes the sound of 427.I built mine because I got a deal on the pistons.If I was going from scratch I would build a 454 or 496.
    My combo is
    10.5/1
    Edelbrock heads
    Victor Jr intake
    Was a Hyd. roller .617/.630,248/254 Dur.
    The car runs mid 11's all day leaving it in drive with the exhaust on and is great on the street.
     
  7. theflash

    theflash Veteran Member Lifetime Gold Member

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    Feb 27, 2004
    Podunk, CT
    Sounds pretty close to what my goal is (the deeper in the 11's the better [​IMG] ). Thanks for all the input guys, I'd still like to hear more opinions and ideas. Also, how do you make a 496? Is it a different crank, or rods, or what?

    BTW, did I mention I might put a blower on this [​IMG]
     
  8. craggar

    craggar Veteran Member

    5,769
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    Jul 28, 1999
    edmonton
    My combo will run deeper in the 11's if you drop the exhaust and shift manually.When i went to Mission it ran 11.teens at sea level with the exhaust on.
     
  9. ddeennis

    ddeennis Veteran Member

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    Feb 12, 2003
    winfield
    well you could go the cheap.....nostalgia...way and build slobbering radical running 427 bbc.

    i did but in a 396 version.

    850 holley
    victor jr intake
    stock closed chambered '390 heads with porting and bigger valves installed
    roller rockers.
    solid 1969 ZL-1 cam 262/273 @ .050"
    11.7 to 1 compression.
    cheap summit headers
    tci 10" stall braked stalled at 4500 rpms
    4.56 gears
    in street trim thru the mufflers in a 3600lbs car 12.10's at 114 mph 7200 rpms

    slicks thru the mufflers mid 11's at 115 to 116 mph.....

    it was radical for the street i think but the cool factor was high from others......."what you got in that thing" "damm that sounds tough" "holy craap"

    oh and thats when im filling it up with 87 octane fuel.......yes it ran on that and was even raced ......throw in some premium fuel and a shot of 104 octane booster and hit the nitrous 150 hp shot and click off some stupid 10 sec runs.......cheap easy and fast.......keep it simple.....ran that combo pretty much the same for about 5 years......2 bolt main stock bottom end with the factory bolts from the 1970 block....oh did i mention it was unbalanced as well.....no big dollars used parts thru out

    ------------------
    1980 z28 3900lbs daily driver,414ci bbc,13.505 @107.19 mph w/2.15 60ft. 2.73 gears in street trim.

    1981 camaro "the race car" as the kids say. 454 .060 over 13 to 1 comp.roller cam,nitrous, 4500 stall and 4.56 gears...severe traction issues,10.80's to low 11's @ 126mph....under recontruction on chassis

    1986 ford pick-up "the tow rig" runs a slow 18.00 flat at 75 mph in 1st and second gear only.
     
  10. theflash

    theflash Veteran Member Lifetime Gold Member

    10,967
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    Feb 27, 2004
    Podunk, CT
    How did you ever get that to run with that low an octane and that high a compression?
     

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