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Heads Question.

This is a discussion on Heads Question. within the Internal Engine forums, part of the LSx Technical Help Section category; Anybody use these heads before or know anything about them? They are from Speed Inc RHS PRO ACTION™ LS Cathedral ...

  1. #1
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    Heads Question.

    Anybody use these heads before or know anything about them? They are from Speed Inc

    RHS PRO ACTION™ LS Cathedral Port Aluminum Cylinder Heads

    Chamber 62cc

    Intake runners 225cc

    Max lift of .600

    intake valve 2.020

    exhaust valve 1.600

    i read the description and did some searching didnt really find out what i wanted to know. Looking for hp/torque gain info. i know the compression ratio is gonna be higher than a set of 243's. Any info (other than the obvious) would be appreciated.
    Last edited by black04gto; 11-17-2013 at 04:59 PM.

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    I was just on the RHS site and do not even see a listing for a cathedral port head. They have an LS7 style rectangular port head for our engines, but that was it -- only one to choose from.

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    I ordered them off the Speed Inc website but you can google it and they come up on other sites also such as performanceparts.com

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    I checked Speed's site after I posted that and did see them. Kind of odd.

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    i can explain why you didnt see them on rhs website. they were discontinued.

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    That makes sense. Any luck on finding an approximate power number?

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    Quote Originally Posted by pajeff02 View Post
    That makes sense. Any luck on finding an approximate power number?
    A copy of the flow chart would speak volumes, such as how the mid lift flow numbers are, and a rough idea of the peak power they would support.

    As to how much gain on your own combo is anyones guess with way too many variables to consider.

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    Couldnt get Them So I Ended Up Getting A Set From Prc. Stage 2.5 Cnc Ls6 Heads.With 60Cc Combustion chambers

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    When are you starting on the swap?

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    i started Saturday. Got the passenger side done already, doing the driver side today. i dropped one of my new Arp head bolts and it apparently landed in a blackhole in my engine bay. So im on hold till more bolts get here. I ordered some more last night so they will get here late today or tomorrow. Also putting on an Awespeed OTRCAI while im at it. All told im trying to get up near 400rwhp

  11. #11
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    make sure you clean every drop of coolant and grim out of those holes. Trust me I know.....



    This time around I'll be installing the heads on the engine stand.

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    Wait What Happened

  13. #13
    Spaz is My Mentor SMWS6TA's Avatar
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    this is from coolant in the head bolt hole. I thought I had cleaned all up and must have missed this one.

    Anyways it blew a nickle size chunk of aluminum into the crank






    this is what else it did.....


    #8 cyl



    still haven't figured out what this came from but was in the oil pan as well




    #7 cyl




    #8 piston



    #7 piston





    plus 3,6,7,8 rod bearings spun, 3 & 6 main bearings spun and gouged the crank.




    All of this because I bounced off the rev limiter.....while doing a burn out (long story)



    No one every accused me of doing something half ass....
    Last edited by SMWS6TA; 11-25-2013 at 12:40 PM.

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    Holy bawllss!!

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    Thread chasers and long q tips are your best friend. Compress air is too. Just make sure those holes are dry and clean.


    this isn't like the old SBC's that the bottom holes are in coolant. LS blocks are a completely dry block when it comes to head & intake bolt holes.

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    yeah ive been using a thread chaser and cutips like mad to get it dry. didnt know why it was so important but damn.

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    If there is oil or coolant in the bolt holes it cannot compress as you install the bolt and the pressure build up can crack the block. The service manual warns about this and, as Scott said, make sure the holes are clean and dry before assembly.

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