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  1. #1
    Join Date
    Aug 2004
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    133

    BBC 427 or LSX LS7....

    Having a hard time deciding on a engine for my car which is a 69 camaro. Im bascially deciding between a LSX LS7 crate or building a all aluminum 427 big block. Now I have all of the parts for the 427 Big block minus the 4 thousand dollar aluminum block but all of the parts are brand spanking new. Which makes me lean a little more toward the big block. Im looking for a good street/strip high fun factor motor. Any oppinions?



  2. #2
    Join Date
    Sep 2007
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    Elizabeth City NC
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    233
    you cant go wrong with a big block wish I had one. plus you got most of the parts already, go big.
    67 camaro

  3. #3
    Join Date
    Jul 2007
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    Tracy, CA.
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    For street/strip, you can't go wrong with the BB but for handling purposes, I would lean towards the LS7...IMO

  4. #4
    Join Date
    Nov 2006
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    Flo-rida
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    Big block FTW!!!!!!! lol

    An all aluminum BB would wax the floor against an LSX

    1993 Camaro Z28
    2001 Camaro Z28
    1969 Camaro


  5. #5
    Join Date
    Jun 2005
    Location
    Greenwood, SC
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    2,317
    depends on what kind of floor you're waxing.

    The big advantage to the ls7 would be that you could, at least theoretically, get the CG down low thanks to the dry sump. that plus sweet oil control and a crazy redline, plus a little less poundage, makes it a better choice for the track/handling.

    For the street...an all aluminum 427bb will be a torque monster. Torque is way more fun on the street. You've already got everything but the block.....I say your decision's pretty clear, even though I love lsx's to death.

    edit: researched engine weights a little bit...from what I read, an all aluminum 427 should weigh around 585 lbs, a traditional small block weighs around 575 lbs, and an ls7 is 458 lbs. So there is certainly an advantage to the ls. If that advantage is great enough to warrant selling everything you've got for the BB and starting from scratch is up to you.

  6. #6
    Join Date
    Mar 2007
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    europe
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    668
    go with the BBC. is it going to be EFI'd or Carb? either way, it will be way fun on the street, and plenty of fun at the strip.
    Jeff J. aka JJ

    1969 Camaro
    1952 Chevy Truck

    wir müssen Leben bis wir Sterben...

  7. #7
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    Sep 2006
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    Henderson,NV
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    You still can't and never will be able to beat the look of a big block chevy. After all it is a muscle car.
    Todd

  8. #8
    Join Date
    Nov 2006
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    Quote Originally Posted by Vegas69
    You still can't and never will be able to beat the look of a big block chevy. After all it is a muscle car.
    Yup, the look people give when they see the size of those heads

    1993 Camaro Z28
    2001 Camaro Z28
    1969 Camaro


  9. #9
    Join Date
    Aug 2004
    Posts
    583
    Why does everyone keep saying that the big block will make more torque? If they have same displacement and can accommodate the same cylinder pressures, they should be capable of equivalent torque. Heck, it has 475 ft-lbs STOCK and lingenfelter gets them to a reliable 575. Plus, you'd never have to worry about cold or off-idle stumble with EFI. I understand the look and aura arguments, and they do have validity, but from a performance standpoint, what am I missing?

  10. #10
    Join Date
    May 2001
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    Quote Originally Posted by Project69
    Big block FTW!!!!!!! lol

    An all aluminum BB would wax the floor against an LSX
    Sounds like you need to get out of you Viper and experience an LS7. And not a stock LS7! God knows that BB won't be stock.

  11. #11
    Join Date
    Nov 2006
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    You dont think i drove an LS7 vette? Before i bought the viper i test drove an 06' Z06 and a Ford GT (for the hell of it) and i took the viper because it was more fun to drive then the others.

    I think someone hates the snakes haha

    1993 Camaro Z28
    2001 Camaro Z28
    1969 Camaro


  12. #12
    Join Date
    Aug 2001
    Location
    Connecticut
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    Alum big block would be fun, but I'd push the CID a lot higher to make it worth carrying the extra weight over an alum small block. For what it's worth an old school alum small block weighs in at 355lbs. Not sure where the lsx comes in with the dry sump stuff though, it might be close.
    1968 Camaro RS/SS, LS7 with Katech mods, T56 Magnum, C6Z06 Brakes
    1968 Camaro RS Convertible project LS3/480hp/4L70E
    1962 Corvette 327-340hp stock
    2006 Corvette Z06
    2011 Corvette GS Convertible


  13. #13
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    Aug 2004
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    Since you have everything but the block, I would say go with the all aluminum big block (I love the way that sounds). It would probably be cheap enough to increase the displacement, but just how much torque do you really want?
    My choice if starting from scratch would be a LS based 427 with a wet sump. Start out with Katech's 4.125 block and you wouldn't have any trouble building big block torque, even with the wet sump oiling system.
    A crate LS7 engine would be nice, but I honestly feel you can build (or have built) a LS engine with better power and reliability for the same money. If I'm wrong, I'm sure someone will correct me.

    Ken

    SCREW IT! Build the "all aluminum big block"!
    If there is a hard way to do something, I'll find it!
    My other car is a Vega.

  14. #14
    Join Date
    Aug 2004
    Location
    Texas
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    I'm taking a break away from my Camaro project to freshen up one of my other cars. The small block in my Biscayne is getting tired, I've been referring to it as Old Smokey to my friends. After 10 years of boosted duty, it's time for the little 406 to go. I'm a firm believer that to the average onlooker, the engine makes the car (but us here know better).
    Peolpe always ask if it's a 350. Their jaws seem to drop even more when they are told it's a 406 (I don't see the big deal). I guess it's big to Mr. Joe Blow, when most engines are 5 liters or less.



    I pulled a 4-bolt 454 out of storage and scrounged up a forged crank from a GMC 366 truck engine, which will make it a 427. Shorter stroke than a 454, making for a better RPMing engine and friendlier at freeway speeds. Aluminum heads and rollerized valve train, it'll scoot.
    This toy is mainly a cruiser for me. Such a big boat is a hand-full when things get hairy. I myself have never had a big block car, I can't wait to compare the two.
    People love the small block, wait 'till they see it with the big one (with the blower).
    Go for the BB427, I am.

  15. #15
    Join Date
    Feb 2007
    Posts
    164
    Build an ally 540ci big block and stick 427 decals on it! A BBC fully dressed is a thing of beauty. They may be strong and reliable but modern engines are just fugly.

  16. #16
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    May 2000
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    Yeah, if you going to build a BBC, it only makes sense to go to a 540 or so.

  17. #17
    Join Date
    Aug 2004
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    133
    Thanks for all of the comments guys. I chose a 427ci BB because of the shorter stroke it will have and the combo I have put togather will let me rip it to 8,000 rpm. Yes I have good internals. The combo I have will make about 650 BHP. Not looking for alot of torque down low I wan't more power up high. I am currently looking at a ls7 for 9 grand but what will the complete conversion cost anybody know?

  18. #18
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    May 2001
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    Mesa, Az.
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    Quote Originally Posted by Yenko boy
    Thanks for all of the comments guys. I chose a 427ci BB because of the shorter stroke it will have and the combo I have put togather will let me rip it to 8,000 rpm. Yes I have good internals. The combo I have will make about 650 BHP. Not looking for alot of torque down low I wan't more power up high. I am currently looking at a ls7 for 9 grand but what will the complete conversion cost anybody know?
    I would say depending on how much you do your self you will probably have between 3 and 6k to install the LS7. That is a off the top ball park.

  19. #19
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    Aug 2007
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    west michigan
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    i am suprised so many people are saying a big block. I have a 454 with an aluminum top end with just under 600 horse and a friend has a ls2 that is lightly built up. while mine has more power I feel like his car is a little more fun on the street. I have been thinking about switching to a lsx motor for a little while now.

  20. #20
    Join Date
    Jul 2007
    Location
    Los Angeles, CA
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    1,313
    Don't stop at 427, go 498 on a Big Block, pretty popular size now a days on a BBC.

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