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Question on LS1 heads

This is a discussion on Question on LS1 heads within the Internal Engine forums, part of the LSx Technical Help Section category; Originally Posted by shady milkman oh are you saying the 806s to a 243s ? did i misinterpreted your post ...

  1. #21
    Member c5z28's Avatar
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    Quote Originally Posted by shady milkman View Post
    oh are you saying the 806s to a 243s ? did i misinterpreted your post
    You looked to far into it, just being sarcastic.

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by c5z28 View Post
    You looked to far into it, just being sarcastic.
    ok i was going to say..."c5 is way to smart for a comment like that"

    firebirdjones...maybe ....j/k

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    Quote Originally Posted by Firebirdjones View Post
    Where that thinking came from was the different casting process the 241's used over the previous years.
    Starting with the 241's, they were cast in 2 different plants with 2 different processes. They used a sand casting at one plant that produced smoother walls and transitions, and these 241's are said to flow a tad better.

    They are identified from other 241's by a particular triangular marking near the spark plugs that are made during the casting process. Some have them, and some don't.

    So technically speaking, there are 241's floating around that are supposed to be better than other 241's, if you follow that.
    Where exactly would this triangle mark be? I kinda looked just now, it's not to easy to see the head by the spark plugs. Is it way easier to see if it's there with the heads off?

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    Quote Originally Posted by Too Fast View Post
    Where exactly would this triangle mark be? I kinda looked just now, it's not to easy to see the head by the spark plugs. Is it way easier to see if it's there with the heads off?

    go to the website in the image code if you want to read more about it, I don't need anymore bs infractions.

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    Senior Member Too Fast's Avatar
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    ^^^Thanks. So it's the big triangle casting mark. I was looking for something a lot smaller, and my heads do have this.

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    My 241's I took off had the mark, and I got lucky off ebay and my 243's have the mark also. Triangle heads are only suppose to be between 5-7hp better due to flow and such.
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    Quote Originally Posted by c5z28 View Post
    You should ask what year the heads are in the internal section, the price in the for sale section.
    Look at the 3 digit # on the top front of your heads and that will tell you the year
    #'s to look for
    806 97-98
    853 99-00
    241 01-04
    This should be stickied! very helpful

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    Quote Originally Posted by natews6 View Post
    This should be stickied! very helpful
    I'm sure it has been, the sticky's aren't as obviously visible as they could be though.

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    So the 241's are better than the 853's? If so then how much? I found a set of 241's online for $130 and I know a guy here in town that said he'd sell me a set of 243's. What would you do in this situation?

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    Quote Originally Posted by natews6 View Post
    So the 241's are better than the 853's? If so then how much? I found a set of 241's online for $130 and I know a guy here in town that said he'd sell me a set of 243's. What would you do in this situation?
    You must have missed my sarcasm on the last page. 241's ain't worth two shits to swap over if your looking for power improvements-just slightly better cast. 806,853,241 will all flow the same if you give them to a shop to be milled and ported. Get the 243's depending on the price, you would see some gains stock (10-20rwhp if you are lucky)but I would have them worked before you put them on. Give them to someone who has done them before and understands they need to be matched with the intakes we have.

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