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advice on what heads to get

This is a discussion on advice on what heads to get within the Internal Engine forums, part of the LSx Technical Help Section category; So I was planning on doing the PRC as-cast heads from Texas Speed for my build this summer but I ...

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    Member 1998 T/A's Avatar
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    advice on what heads to get

    So I was planning on doing the PRC as-cast heads from Texas Speed for my build this summer but I saw some Ls7 heads on LS1tech, looks like valves only no rockers or springs but he is asking 300 shipped...I'd like to jump on them, what do you guys think? probably gonna run a 233/239 cam...below is the ad for the heads....

    LS7 Heads ported by Frankenstein Racing Heads - 2,300$

    Previous deal fell through, so I'm making a new post. Here's all the details.

    New, never ran LS7 heads ported by FRH.

    Stock titanium LS7 intake valves that have been tumble polished by FRH / Del West.

    Stock lash caps for the intake valves

    Manley stainless steel solid stem exhaust valves

    New spring seats

    New valve seals

    CHE bronze guides

    Rear steam ports have been drilled and tapped, and -4 fittings have been installed

    The pushrod holes have been enlarged so they can accept a 1/2" pushrod.

    Heads have been machined for shaft rockers. Stock rockers can be used with a rocker stand from All Pro, MAST or TFS. They're about 100$ for the set.

    70cc chambers

    Flow numbers
    Intake Exhaust
    0.200 154 110
    0.300 249 195
    0.400 310 215
    0.500 357 235
    0.600 382 244
    0.650 390 245
    0.700 395 257
    0.750 418 269
    Last edited by 1998 T/A; 03-26-2016 at 11:35 AM.
    98' Trans AM RIP

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    Senior Member Naaman's Avatar
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    Okay, wait: did you have a typo, or did you not see the "2" in front of the "300" for the asking price? Big difference there!
    Lid, Throttle Body, LS6 Intake, Heads, Cam, Magnaflow, LS7 Clutch, SFCs, STB, Panhard Bar, Strano Springs, Hollow Sway Bars, Poly/Roto LCAs, Konis, MGW Shifter

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    Member 1998 T/A's Avatar
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    so stupid hahaha...I must be high or something....wow...

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    $300 is a steal lol
    It's on jackstands.

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    Senior Member Naaman's Avatar
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    Quote Originally Posted by 1998 T/A View Post
    so stupid hahaha...I must be high or something....wow...
    We all have our moments!!!

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    Quote Originally Posted by 1998 T/A View Post
    so stupid hahaha...I must be high or something....wow...
    Quote Originally Posted by Naaman View Post
    We all have our moments!!!
    Quote Originally Posted by SuperSSguy View Post
    Sometimes those moments are green`ned.....Uh I mean needed!!

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    Veteran 0rion's Avatar
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    I'm admittedly behind the times these days on what people are capable of doing but to my knowledge you can't run LS7 heads on an LS1.
    Quote Originally Posted by Mean Green Z28 View Post
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    Senior Member Naaman's Avatar
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    I was under the same impression, tbh.

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    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by 0rion View Post
    I'm admittedly behind the times these days on what people are capable of doing but to my knowledge you can't run LS7 heads on an LS1.
    I didn't even look at that. You're correct, you can't.

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    Spaz is My Mentor SMWS6TA's Avatar
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    ^^Correct

    Only LQ4/9, LS2, LS3, LS7, LSA blocks can

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    Moderator 98TransAmWs-6's Avatar
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    LQ9/4 and ls2 cannot actually you need a larger bore than they are capable of to. They need a 4.100" bore. The ls3 would need to be bored out as well but IDK if it can be bored out that much. There are some small bore bore versions out there though.
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    Spaz is My Mentor SMWS6TA's Avatar
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    Quote Originally Posted by 98TransAmWs-6 View Post
    LQ9/4 and ls2 cannot actually you need a larger bore than they are capable of to. They need a 4.100" bore. The ls3 would need to be bored out as well but IDK if it can be bored out that much. There are some small bore bore versions out there though.
    Maybe that's what I had read a while back...

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    Moderator 98TransAmWs-6's Avatar
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    They are really pricey though and probably not worth it. I want to say they are in the $3000+ range. For that you can just get frh ls3 trick flows that flow better.

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    Veteran 0rion's Avatar
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    I thought even the small bore LS7's needed at least a 4.000 bore or something like that.....maybe it was 3.900 though....I don't keep up with this stuff like I used too.

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    Moderator 98TransAmWs-6's Avatar
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    No you are right I was more of talking about the ls2 and Lq9/4 Scott mentioned.

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    Spaz is My Mentor SMWS6TA's Avatar
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    advice on what heads to get

    Lq4 & 9's are 4" bore
    http://www.ls1.com/forums/f7/my-6-liter-build-174257/

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    Moderator 98TransAmWs-6's Avatar
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    I know I was saying since they don't have a 4.100 bore standard ls7 heads won't work. Small bore will.

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    Actually you can run ls7 heads on an lq engine, just need to bore. 060". Copo camaros run them with a 4.065 bore. With roughly. 030" cylinder wall clearance... I am trying to get the to fit my 4.030" lq9, intakes clear the 4.0" bore and the exhaust hit the block deck. I may have to turn the valves down to 1.59". From 1.615"
    Just an FYI...

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    Veteran 0rion's Avatar
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    there's definitely enough gains there to justify some work getting them to fit....things flow like crazy. Kinda pisses me off when I think about the work and money I put into my car and what the possiblities are now. That's why I try not to think about it when I can help it.

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    Moderator 98TransAmWs-6's Avatar
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    Pretty sure the copo is a 427 (4.125" bore x 4.0" stroke). Might be wrong but that's what I thought it was.

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