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Aluminum heads

This is a discussion on Aluminum heads within the Internal Engine forums, part of the LSx Technical Help Section category; Thinking about going with alluminum heads but want some opinions... Patriot Performance has suggested the following Patriot alluminum heads CNC ...

  1. #1
    Junior Member 03ChevyStepside's Avatar
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    2003 Chevy Silverado

    Aluminum heads

    Thinking about going with alluminum heads but want some opinions...

    Patriot Performance has suggested the following

    Patriot alluminum heads
    CNC Ported, hand blended, 5 degree angle,
    2.00" 1.55", & new OEM valves

    Will I notice anything with 2.00" 1.55" over what came stock? Or, should
    I consider going a little more radical?

    what are those measurements on the stock heads?

    thanks.

  2. #2
    no more 4th gen secondgearscratch's Avatar
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    Pewter
    2000 z28

    Quote Originally Posted by 03ChevyStepside View Post
    Thinking about going with alluminum heads but want some opinions...

    Patriot Performance has suggested the following

    Patriot alluminum heads
    CNC Ported, hand blended, 5 degree angle,
    2.00" 1.55", & new OEM valves

    Will I notice anything with 2.00" 1.55" over what came stock? Or, should
    I consider going a little more radical?

    what are those measurements on the stock heads?

    thanks.
    just having heads on an otherwise stock short block wont benefit you that much. adding a cam into the equation and matching it with head flow will make serious power. heads and cams is a combo that should be combined according to flow of the heads and duration of the cam lift.

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    Junior Member 03ChevyStepside's Avatar
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    2003 Chevy Silverado

    I had a comp cam with the following specs put in last year.

    .566 lift 222/224 duration 112 lsa

    and a Yank TT3000 torque converter.

    so with that cam what should I go with as far as heads go? Are the ones that Patriot suggest okay?

    Patriot Alluminum Heads
    CNC Ported
    Hand Blended
    5 degree angle
    2.00" 1.55"
    and new OEM valves

    thanks for your help.

  4. #4
    Senior Member mrr23's Avatar
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    2000 corvette

    if you have a 5.3L motor, the stock valves are 1.89/1.55 with 61cc chamber

    if you have a 6.0L motor, the stock valves are 2.00/1.55 with 70cc chambers

    it's not just the valve size, it's the porting and chamber size that makes the most difference.

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    Junior Member 03ChevyStepside's Avatar
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    thanks

    Quote Originally Posted by mrr23 View Post
    if you have a 5.3L motor, the stock valves are 1.89/1.55 with 61cc chamber

    if you have a 6.0L motor, the stock valves are 2.00/1.55 with 70cc chambers

    it's not just the valve size, it's the porting and chamber size that makes the most difference.

    I have the 5.3L 1.89/1.55
    and the heads I've chosen are 2.00/1.55

    Will I get the 30-40 hp (or perhaps even more) as I've been told? Also, will I notice any quicker acceleration especially on takeoff?

    Stock it came with 3.73 gears and everyone tells me those are fine... but I keep thinking that bigger gears, even if only slightly bigger, might be what I want?

  6. #6
    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    with tuning, you can get the 30-40 rwhp. i did a head only swap on the wife's car. after tuning 37 rwhp. on stock tune, 17 rwhp. this was on stock cam.

    honestly, do not change gears. changing them will help with initial acceleration, but cut you off on the top end of a 1/4 mile run.

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