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862 vs. 241...

This is a discussion on 862 vs. 241... within the Internal Engine forums, part of the LSx Technical Help Section category; Need to shut a teenager up about the difference in the way they flow. Googled it to no avail. Anyone ...

  1. #1
    She-Member jrbonds's Avatar
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    2002 WS6
    1965 Mustang

    862 vs. 241...

    Need to shut a teenager up about the difference in the way they flow. Googled it to no avail.

    Anyone know where I could find this information?

    He put 862 heads on his LS1 to "bump" up his compression.
    Last edited by jrbonds; 07-01-2013 at 07:54 AM.

  2. #2
    Sold: LS1 '85 El Camino ls1camino's Avatar
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    2000 Grand Prix GTP
    2000 Trans Am WS6 M6

    Casting Number 706 and 862
    Head: 1999+ 4.8L / 5.3 Liter Truck
    Material: Aluminimum
    Part Number:
    12559862
    12561706
    Combustion Chamber Volume: 61.15cc
    Compression Ratio: 9.5:1
    Intake Port Volume: 200cc
    Exhaust Port Volume: 70cc
    Intake Valve Diameter: 1.89 inches
    Exhaust Valve Diameter: 1.55 inches

    Stock Head Flow Numbers
    Chamber 61.15 cc----0.100--0.200--0.300-- 0.400--0.500---0.550---0.600
    Intake 200 cc----------63 ---128----179-----210----218----221-----226
    Exhaust 70 cc----------54 -- 93 ----121----145-----163----168----174

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    Casting Numbers 241, 806, 853
    Head: 1997+ LS1 5.7 Liter Passenger Car
    Material: Aluminimum
    Part Number:
    12559806 (1997-98) Chambers = 69cc
    12559853 (1999-00)
    12564241 (2000-03)
    Combustion Chamber Volume: 66.67cc
    Compression Ratio: 10.1:1
    Intake Port Volume: 200cc
    Exhaust Port Volume: 70cc
    Intake Valve Diameter: 2.00 inches
    Exhaust Valve Diameter: 1.55 inches

    Stock Head Flow Numbers
    Chamber 66.67 cc------0.100--0.200---0.300---0.400---0.500---0.550--0.600
    Intake 200 cc------------67----122-----178-----215-----219-----223---227
    Exhaust 70 cc------------52-----97-----133-----156-----170-----76----180

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    He's actually right...due to the smaller combustion chamber, he actually bumped his compression slightly.

    While this is the case, all of the work he put into doing that with stock 862 heads is barely worth the gain. He would have been better off slightly milling and porting the intake and exhaust ports as well as having LS1 sized valves installed. As you can see the 5.3 heads have smaller valves and are probably hurting his gains If he just swapped heads and nothing else he didn't gain much.

  3. #3
    She-Member jrbonds's Avatar
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    Thank you so much!!!!!

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    2000 Grand Prix GTP
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  5. #5
    Visualize°Design°Create SSwt00SS's Avatar
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    '12 Silver SS 1SS
    '00 Black SS #8617

    agreed...imo, running a 5.3 head vs. a ported/milled 5.7 head is a step backwards for the reasons ls1camino detailed above.

    sure, he may have 'bumped/increased' the c/r but running the smaller head he definitely is not getting the most potential for time, money invested, etc. with that set-up.

  6. #6
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    Impulse Blue Metallic
    2004 GTO

    I have an 04 gto with 241 heads. I found a set of 5.3 heads off a Chevy truck for $100... Is it worth it to get them cnc'd vs having the ls1 heads cnc'd?

  7. #7
    Former Mopar Man 2002ssslp's Avatar
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    Silver & Blue
    02 Camaro SS, 04 GTO

    Quote Originally Posted by jesselee83189 View Post
    I have an 04 gto with 241 heads. I found a set of 5.3 heads off a Chevy truck for $100... Is it worth it to get them cnc'd vs having the ls1 heads cnc'd?
    I thought the 2004 GTO had 243 heads
    My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
    My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 3200 Yank, 75k

  8. #8
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    Impulse Blue Metallic
    2004 GTO

    Nope... 241... 05-06 ls2 gto had the 243s

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