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  1. #21
    Join Date
    Jun 2017
    Posts
    219
    Quote Originally Posted by surfwagon View Post
    The LS2 manifold is a piece of crap just google upgrading from LS6.
    In the states they were plastic welding LS2 snouts onto LS6 manifolds to get the biggest intake with the best flowing factory manifold.
    If you want a better flowing manifold than the LS6 get FAST102 manifold.
    This was the last mod I did to my LS2 and the engine gained torque from bottom to top of rev range with a max gain of around 20N.M at around 4500rpm.
    There was only around 3-5kw gain in horsepower but it was the torque that was the telling part.
    Read post#3 https://ls1tech.com/forums/generatio...s-90-92-a.html
    I was thinking about what heads to put on the old girl . 241 heads on it now with the LS6 intake. 243 heads ?


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  2. #22
    Join Date
    Sep 2010
    Location
    Bondi
    Posts
    1,067
    Quote Originally Posted by Craigu View Post
    I was thinking about what heads to put on the old girl . 241 heads on it now with the LS6 intake. 243 heads ?


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    If you could pick up some 243's cheap maybe but why not just get some Higgins CNC'd 241's exchange.
    I've got Higgins 243's on my senator and combined with the Fast102 gave the car a real nice torque kick which is fine when running 4 spd auto.

  3. #23
    Join Date
    Jan 2004
    Location
    Perth, WA
    Posts
    7,830
    Quote Originally Posted by Craigu View Post
    I been told not to spend money on motor to itís time to refresh it or get new one


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    Quote Originally Posted by Craigu View Post
    I was thinking about what heads to put on the old girl . 241 heads on it now with the LS6 intake. 243 heads ?


    Sent from my iPhone using Tapatalk
    What happened to not spending money on it? Didn't last long lol
    How many kms has it done?

    243's are better than 241's but Higgins 241's are better than standard 243's....

  4. #24
    Join Date
    Jun 2017
    Posts
    219
    Hehehe


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  5. #25
    Join Date
    Jun 2017
    Posts
    219
    Quote Originally Posted by white_lie View Post
    What happened to not spending money on it? Didn't last long lol
    How many kms has it done?

    243's are better than 241's but Higgins 241's are better than standard 243's....
    The old girl as 300.000 km on clock but had cam up grade in 2015 . Donít know what else was done to motor at the time . Refresh or not . Workshop is going to keep eye on compression is ok .


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  6. #26
    Join Date
    Dec 2013
    Posts
    474
    Old post but what's the difference between Higgins 241 and 243 CNC heads? I know the difference in exhaust ports on the stock castings. I don't know if internally the 243 allow further porting that the 241 wasn't designed for. I read on an older post that once CNC'd they were essentially the same besides the casting number but then Higgins responded helpfully with their in-depth reply of, "They are different." And that was to a potential customer of $1600 heads, they didn't know I already had a set. And based on that why would you want the CNC 241 over the 243, casting number aside, given that they are the same price but seemingly different performance?
    Last edited by Aus78Formula; 2 Weeks Ago at 12:34 AM.

  7. #27
    Join Date
    Mar 2011
    Location
    VIC
    Posts
    2,265
    might be valve sizes are different but the ports can be cnc'd to basically match ?

  8. #28
    Join Date
    Jan 2004
    Location
    Perth, WA
    Posts
    7,830
    Valve sizes are the same, chamber volume is slightly different and 243's have sodium filled valves from memory. Once you start modifying/porting them, I couldn't tell you what differences there are, would depend on the porter and how you spec them up. There may be a teeny tiny difference up top that you'd need a big cam for but if going on a streeter with a reasonable sized cam, there probably wouldn't be bugger all difference in the figures thru the midrange.

  9. #29
    Join Date
    Dec 2013
    Posts
    474
    Thanks, I'd imagine they are very similar regardless. It just seemed like it was too hard to supply the information and I gave up after searching too deeply! Pretty sure mine are 241-based, just didn't like the idea of paying the same price when an even better option is next to it, regardless of if needed!

  10. #30
    Join Date
    Dec 2014
    Posts
    162
    Another head that is accessible and can be sent to Higgins is the 799 head. Easier to find at Enginemaster etc, most of a 243 head, better priced.







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