427 vs 454

Discussion in 'Engine Topic' started by 70RS/SS396, Aug 7, 2006.

  1. 70RS/SS396

    70RS/SS396 Veteran Member

    Jul 18, 2005

    I just want to hear your opinion when it comes to street power, 427ci vs 454ci.

    Some people say that the 427ci is more aggresive, and easier to get more power of. And its tolerate more RPM because the shorter stroke.

    / Kristoffer
  2. theflash

    theflash Veteran Member Lifetime Gold Member

    Feb 27, 2004
    Podunk, CT
    No replacement for displacement. I was facing the same notion when I wanted a BB. I chose the 454, and I tell you, I couldn't imagine something reving faster than this motor, a lot more than my old sbc.
  3. 80'427

    80'427 Veteran Member

    Jan 1, 2005
    Fairbury, NE, USA
    I chose 427 cause of the cheap forged crank but now I would go 4.25 and get a 496. I would go 454 at least unless you have all the 427 pieces.
  4. Street? There is no rule against displacement, so go as big as you can. For a given maximum power, it will be nicer to drive and more tractable at part throttle. It will also idle better.
  5. muscl car

    muscl car Veteran Member Lifetime Gold Member

    the 427 has alot of racing heritage from the earlier days , a all aluminum ZL1 is actually based off of the 427 .now for me a 427 has a a certain statement or feel because of it's vast racing history
  6. 70RS/SS396

    70RS/SS396 Veteran Member

    Jul 18, 2005
    I just thought building a 427 of my 402 in the future, because I got the 396/402/427 crank now, onley thing I need is a 427 or a 454 block.
    Last edited: Aug 8, 2006
  7. lluciano77

    lluciano77 Guest

    Most old timers will tell you tell run the 427. They would also tell me to run a pop-up piston 327 instead of my 400.Times have changed. Displacement, compression, and aftermarket heads are the way to go.

    The more displacement you have, the less RPMs you need to spin. I always hear people talking about high revs. F' that. Why not make the same or more power in an RPM range that doesn't break parts? Why not make the same power or more and have a better idle quality?

    Even better, there are stroker kits for the 454 that are super cheap. I almost went big block, but I wanted to try to keep the handling characteristics of my Camaro, and make it fast.

    Here is the kit I would use if I went big block:
  8. 70RS/SS396

    70RS/SS396 Veteran Member

    Jul 18, 2005
    Yeah. I friend of mine bought a 540 ci motor to his chevelle 68. 700+ hp and VERY good idle, and its streetdriven.
    But its not cheap to buy such of things here in sweden, and if I order direct from usa, theres expensinve shippingcharge and 25% value-added tax.
  9. Damon

    Damon Veteran Member

    Nov 16, 2000
    Philly area
    454 is basically a "stroker 427." It's got ~1/4" more stroke but shares the same 4-1/4" bore. I'll take the bigger cubes any day of the week.

    Also, if you're considering aftermarket heads or the larger chamber factory heads (open chambers) you'll have a LOT easier time getting reasonable compression without using rediculous domes if you go with a larger cube motor. Almost all aftermarket heads are based off the factory "open chamber" design, and for good reason- they unshroud the valves and flow much better than earlier "closed chamber" heads. Unfortunately, that also means the combustion chambers are HUGE. Typically ~120cc. Even on a 454 it takes a BIG dome to get compression out of the toilet. On a smaller 427 you'd need even larger domes than that.

    Think it through before you decide.

    FYI- what makes an engine feel "free revving" has little to do with the bore/stroke ratio. It has everything to do with how well you match your heads and cam (and the rest of the combo).
  10. 70RS/SS396

    70RS/SS396 Veteran Member

    Jul 18, 2005
    Yeah, but I just thought I should save some money and build a 427 of my 402 suff like, crank, flexplate, harmonic balanser etc. If I should build a 454 I need another crank, felxplate, harmonic balanser etc. I cant use anything I allready got.

    Lets pretend we have one 427 and one 454. Both motors with exact same stuff.
    Cylinger heads: Brodix Race-Rite Oval port.
    Intake Manifold: Edelbrock Air-gap Performer RPM
    Camshaft: Comp Cams # 11-250-3 - 574"/578" lift 284/296 dur.
    Carb: Holley 850 cfm

    What can the difference in hp and torque be?
    Last edited: Aug 8, 2006

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