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    1. #1
      Join Date
      Aug 2004
      Posts
      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
      Location
      Elizabeth City NC
      Posts
      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
      Location
      Tracy, CA.
      Posts
      1,347
      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
      Location
      Flo-rida
      Posts
      1,204
      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
      Posts
      2,314
      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
      Location
      europe
      Posts
      666
      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
      Join Date
      Sep 2006
      Location
      Henderson,NV
      Posts
      2,870
      Country Flag: United States
      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
      Location
      Flo-rida
      Posts
      1,204
      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
      582
      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
      Location
      Mesa, Az.
      Posts
      1,433
      Country Flag: United States
      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
      Location
      Flo-rida
      Posts
      1,204
      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
      Posts
      1,569
      Country Flag: United States
      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
      1972 Corvette LT1 Stock
      2006 Corvette Z06
      2011 Corvette GS convertible


    13. #13
      Join Date
      Aug 2004
      Location
      Ontario, Canada
      Posts
      2,313
      Country Flag: Canada
      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
      Posts
      254
      Country Flag: United States
      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
      Join Date
      May 2000
      Posts
      4,151
      Country Flag: United States
      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
      Posts
      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
      Join Date
      May 2001
      Location
      Mesa, Az.
      Posts
      1,433
      Country Flag: United States
      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
      Join Date
      Aug 2007
      Location
      west michigan
      Posts
      513
      Country Flag: United States
      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
      Posts
      1,303
      Don't stop at 427, go 498 on a Big Block, pretty popular size now a days on a BBC.

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