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Topic Review (Newest First)

  • 12-19-2010, 08:47 PM
    Blowncat 509
    not without the tunnel ram!, (couldn't resist)
  • 12-19-2010, 07:44 PM
    gn7
    Don't be sorry. But if you look aound, that seems to be the general thought. And now, because the LS has spread ports, and the Vette motors works pretty decent, then all LSs are pretty good motors and the 8.1, by way of having a similar port shape and layout, must killers too.
    I swear, I do not remember anyone thinking that because the '69 L88 way a huge success, that someone with a 1969 3/4 ton GMC truck motor thought they had the same engine with just a camshaft away from the same HP.



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  • 12-19-2010, 07:16 PM
    matt wheeler

    496

    Sorry gn7 for geting you back on this ls thing again i just didnt see anything different with the new 496 vs the ls small block other than its a little bigger. Like i told my buddy the motor sucks sell it and put a real motor in it i know im probably going to get bashed for saying that but yes i think the ls is crap. A buddy and me run a big block altered against these ls camaros all the time we love giving them a head start and chasing them down all the time, we just run a little bracket class up the road from the house i havent seen any ls cars run that well and there are probably 20 that show up. Some of them sound good i have to admit buddy they are all sound
  • 12-19-2010, 07:08 PM
    gn7
    Look around. A LS is a LS is a LS. They are all the same. typical thread comment, I'm going to replace my BBC with an LS.
    348 where the same as 409s, 352 Fords are just a smaller 427 tunnel port or hi rise, 366 GMC truck is just like a LS6 BBC. They are all the same.
    So because the LS(all of them) is such an ass kicker, the same port design must be killer on the 8.1. We've all seen how many people have stormed the GM parts counter to get there hands on these masterpieces
    I swear, half the infatuation with the LS, is the very fact that thye call them LSs. And they clump them all together. But then, we have learned the very best BBCs came from Burbs, so maybe the very best LSs come from Ecalades



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  • 12-19-2010, 01:59 PM
    bp298
    Quote Originally Posted by gn7 View Post
    It would be like comparing a 8.1 to a Gen6 502. Not hardly, and nobody is that stupid.

    i cannot believe this! shocking!
  • 12-18-2010, 05:33 PM
    gn7
    Quote Originally Posted by Blowncat 509 View Post
    OK, can't say I have ever owned one, or even try to get more performance out of one!
    all I know is the ports are kinda like an ls, and I guess I was speculating, cuz the ls heads
    DO work well. I do know that the 8.1l in a 1 ton, flat hauls ass tho! and sucks the fuel
    accordingly- I have driven them in that aspect, and they run pretty good(in a truck)
    LS 7 These work.


    These do not


    These work


    These do not


    If they worked, at all, Raylar wouldn't include heads in the lowest HP package. They do not work. Neither do the LS cathedral heads. If they did, GM wouldn't have needed to COMPLETELY revamp the head for the LS7, 9 or made a similar head for the 6.2.



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  • 12-18-2010, 04:13 PM
    djunkie
    Quote Originally Posted by Blowncat 509 View Post
    OK, can't say I have ever owned one, or even try to get more performance out of one!
    all I know is the ports are kinda like an ls, and I guess I was speculating, cuz the ls heads
    DO work well. I do know that the 8.1l in a 1 ton, flat hauls ass tho! and sucks the fuel
    accordingly- I have driven them in that aspect, and they run pretty good(in a truck)
    I've been in a few boats with the 496 HO motor. Seems to run well. They sound like they have a lot of camshaft in them the way they idle. I just can't believe the money they cost new. Just seems ridiculous.
  • 12-18-2010, 04:07 PM
    Blowncat 509
    OK, can't say I have ever owned one, or even try to get more performance out of one!
    all I know is the ports are kinda like an ls, and I guess I was speculating, cuz the ls heads
    DO work well. I do know that the 8.1l in a 1 ton, flat hauls ass tho! and sucks the fuel
    accordingly- I have driven them in that aspect, and they run pretty good(in a truck)
  • 12-18-2010, 04:03 PM
    djunkie
    Quote Originally Posted by gn7 View Post
    Its not the shape of the port I dislike. Its the fact that stock don't work. Ask Raylar? Ask Raylar? Their smallest kit includes new heads. What does that tell you. If the stock heads are that good, they would leave them. The motor is behind the eight ball upgrade wise. If the heads worked so well, they could support most of, if not all of the available upgrades for the thing. They can't. They make those heads, because it needs heads, badly. After exhaust, you better get to the heads, because for any other improvements youn are going to need tham except possibly a Whipple set for 5lbs.
    N/A750 hp home build 496 MKIVs are as common as dirt. Don't even think trying to get there with a 8.1 for any where near the same money.
    The only reason I smack talk the cathedral heads on the LS is because everybody points to flow of the LS7 and 9s and says wow. And then turns around and builds a LS1 OR 3 as if its the same engine. And its not even close.
    It would be like comparing a 8.1 to a Gen6 502. Not hardly, and nobody is that stupid.
    660hp Pump gas 496 with a single 850 and only spinning it to 6k rpm.
    And for about the same price as these used 8.1's are going for.
  • 12-18-2010, 03:52 PM
    gn7
    Quote Originally Posted by Blowncat 509 View Post
    the cathedral style intake ports on the 8.1 liter, kinda like GN7'z favorite LS motors
    actually flow very well! that funky lookin' chit actually works, ask RAYLAR! just sayin'....
    Its not the shape of the port I dislike. Its the fact that stock don't work. Ask Raylar? Ask Raylar? Their smallest kit includes new heads. What does that tell you. If the stock heads are that good, they would leave them. The motor is behind the eight ball upgrade wise. If the heads worked so well, they could support most of, if not all of the available upgrades for the thing. They can't. They make those heads, because it needs heads, badly. After exhaust, you better get to the heads, because for any other improvements youn are going to need tham except possibly a Whipple set for 5lbs.
    N/A750 hp home build 496 MKIVs are as common as dirt. Don't even think trying to get there with a 8.1 for any where near the same money.
    The only reason I smack talk the cathedral heads on the LS is because everybody points to flow of the LS7 and 9s and says wow. And then turns around and builds a LS1 OR 3 as if its the same engine. And its not even close.
    It would be like comparing a 8.1 to a Gen6 502. Not hardly, and nobody is that stupid.



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  • 12-18-2010, 08:02 AM
    Blowncat 509
    seems like the XR drives these days don't last as long as a stock bravo, due to the
    crappy quality gears in the uppers--just don't last with any power! been reading up on
    this on OSS- AND talked to Brian @ B&D Marine about it......
  • 12-18-2010, 07:52 AM
    BigSteve
    The 496 motor w/ exhaust mods gave 50 more hp

    The good part, of this package is 6 years of factory and extended warranty

    Even going with Bravo XR drive you will kill them over time

    A pair will push a 28 daytona 105mph
  • 12-18-2010, 07:33 AM
    Blowncat 509
    the cathedral style intake ports on the 8.1 liter, kinda like GN7'z favorite LS motors
    actually flow very well! that funky lookin' chit actually works, ask RAYLAR! just sayin'....
  • 12-17-2010, 08:49 PM
    gn7
    Quote Originally Posted by matt wheeler View Post
    I guess the jerking around could come from a aggressive cam profile but i dont think they put anything special in these motors did they. I have seen some people just throwing whipple blowers on them and that just dont sound like a good idea i bet they have cast junk pistons in them and that just sounds like something bad waiting to happen. I looked at a set of heads the other day and the intake ports look like crap kinda like one of those LS junk motors is that the new big thing puting heads on motors that are called performance engines that cant flow shit
    The very first 425 hp had forged crank and pistons. GM dropped that right away when they and Merc decided they were never going to get into ramping them up. The only diff between the later ones was a camshaft and a different mapping in the ECM Biggest issue with a blower on them is the damper has no key in it. It just pressed on and bolted. Whipple made a device to put on the snout and run a drill down the snout, creating a half round key slot and using a dowel in a matching machined damper hub. Better than nothing. But they didn't recomend more than 5lbs of boost on the motor, and the original damper set up seemed to handle that OK. As for the heads, Raylar heads have a near perfect finish on them, but I just don't know if the motor and available aftermarket justifies them. Its just to bad that the thing got dropped before it had a chance. I think it didn't help that the size was a little bit of disappointment, and you could duplicate the size, and thru a shorter stroke, with a junk yard BBC and it would perform better.

    He should be able to sel it though. Lots of people thinking of repowering instead of a new boat, and there are few that may upgrade from a ill advised SBC when originally purchasing.



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