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LT4 question

This is a discussion on LT4 question within the LT1 forums, part of the Vehicle Specific category; this is what has been done to it .. Engine: -355 LT1 w/LT4 Hotcam, stock heads, and 1.6RRs -Racetronics 32# ...

  1. #1
    Senior Member snaggeltooth's Avatar
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    LT4 question

    this is what has been done to it ..
    Engine:
    -355 LT1 w/LT4 Hotcam, stock heads, and 1.6RRs
    -Racetronics 32# injectors, 52MM TB w/ airfoil, K&N CAI
    -EWP, Underdrive pulleys, MSD Coil, Taylor 8mm wires
    -Pacesetter LTs, Custom 3'' exhaust w/E Cut-out and Dynomax Ultra-Flo
    So how much HP you think that is making over a stock LT1 and how much would worked heads help.???
    Ohh it has had a custome tune at a local shop ...

  2. #2
    Senior Member 5.0THIS's Avatar
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    Through a 6 speed... 330-345rwhp.

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    Member side2000's Avatar
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    you'll gain some substantial gains from LT1 to 4 heads, those LT1 valves are pretty small. the LT4 heads still aren't that great, some aftermarket heads or some ported LT4's with big valves would be the way to go.

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    Senior Member snaggeltooth's Avatar
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    LT4 heads would = how much $$ .. Would they be a basic bolt up ??

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    Member side2000's Avatar
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    well to buy them from GM is too much for what they are. i think a set is 14-1500 from summit. they would be basic bolt-up but you need LT4 manifold unless you wanna modify the one you have (not worth it). what's your budget look like?

    the LT4 heads would be a good base for the cam you have, but respond better to a little work, they have 2.00/1.55 int/exh valves which could stand to be replaced.

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    Senior Member snaggeltooth's Avatar
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    Quote Originally Posted by side2000 View Post
    well to buy them from GM is too much for what they are. i think a set is 14-1500 from summit. they would be basic bolt-up but you need LT4 manifold unless you wanna modify the one you have (not worth it). what's your budget look like?

    the LT4 heads would be a good base for the cam you have, but respond better to a little work, they have 2.00/1.55 int/exh valves which could stand to be replaced.
    with waht 5.othis said .. 350 RWHP is a good place to be for me .. vs at least $1200 ... thanks for the info ..

  7. #7
    Senior Member 5.0THIS's Avatar
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    porting the LT1 heads is a better bet than trying to get LT4 heads.

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    Kenne-Bell Killer Cayenne97's Avatar
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    Quote Originally Posted by 5.0THIS View Post
    porting the LT1 heads is a better bet than trying to get LT4 heads.
    IF...money is an object. If money isn't, LT4's will give you more flow and more power over any built LT1 - period.

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    Senior Member 5.0THIS's Avatar
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    Quote Originally Posted by Cayenne97 View Post
    IF...money is an object. If money isn't, LT4's will give you more flow and more power over any built LT1 - period.

    If I was that concerned with an extra 10-20 cfm that the LT4 heads offer over LT1 heads at any given stage, I wouldnt be fucking around with factory heads anyway.

  10. #10
    Kenne-Bell Killer Cayenne97's Avatar
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    Quote Originally Posted by 5.0THIS View Post
    If I was that concerned with an extra 10-20 cfm that the LT4 heads offer over LT1 heads at any given stage, I wouldnt be fucking around with factory heads anyway.
    GTP LT4 race heads flow about 320 cfm out of the box. Show me an LT1 head that is within 10-20 cfm of that. Fully ported LT1 heads flow good, but not as well as LT4's. LT4's have the potential to make more power in a higher range.

  11. #11
    lt4 hot cams kinda soft especially if you are gunna stroke and get decent bottom ends that can handle some extra rpms

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    Senior Member 5.0THIS's Avatar
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    Quote Originally Posted by Cayenne97 View Post
    GTP LT4 race heads flow about 320 cfm out of the box. Show me an LT1 head that is within 10-20 cfm of that. Fully ported LT1 heads flow good, but not as well as LT4's. LT4's have the potential to make more power in a higher range.


    I probably would never run a factory casting head CLAIMING to flow 320 cfm. I'm betting they're paper thin. Besides, put those GTP heads on several different flow benches and I bet they dont flow 320. Simply, I dont believe their heads flow that well.

    And like I said, if I wanted to make that big of power, I'd have a thick deck ported AFR head and boosted motor and be done with it. 99% of people just wont see the added benefit of LT4 over LT1 heads.

  13. #13
    Senior Member bigrondownhiller's Avatar
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    Quote Originally Posted by Cayenne97 View Post
    GTP LT4 race heads flow about 320 cfm out of the box. Show me an LT1 head that is within 10-20 cfm of that. Fully ported LT1 heads flow good, but not as well as LT4's. LT4's have the potential to make more power in a higher range.
    At what lift do they flow that?

  14. #14
    Kenne-Bell Killer Cayenne97's Avatar
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    Quote Originally Posted by 5.0THIS View Post
    I probably would never run a factory casting head CLAIMING to flow 320 cfm. I'm betting they're paper thin. Besides, put those GTP heads on several different flow benches and I bet they dont flow 320. Simply, I dont believe their heads flow that well.
    GTP heads have always lived up to their claims and are arguably what some consider one of the top LTX heads on the market. And what would lead you to believe their flow numbers are bogus? Sounds pretty wacky if you ask me.

    Quote Originally Posted by 5.0THIS View Post
    99% of people just wont see the added benefit of LT4 over LT1 heads.
    Probably because 99% of people won't choose to take an LTX that far naturally-aspirated. But some will. I have a few friends myself that have, N20LT4 being one example that made well over 500rwhp naturally-aspirated with a set of 227 LT4 heads. LT4 > LT1.

    Quote Originally Posted by bigrondownhiller View Post
    At what lift do they flow that?
    .600.

  15. #15
    Senior Member 5.0THIS's Avatar
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    Quote Originally Posted by Cayenne97 View Post
    Probably because 99% of people won't choose to take an LTX that far naturally-aspirated. But some will. I have a few friends myself that have, N20LT4 being one example that made well over 500rwhp naturally-aspirated with a set of 227 LT4 heads. LT4 > LT1.

    Yeah, and if I wanted a good head I'd go with an AFR aftermarket head, because they have more potential. At that point who gives a fuck what LTx port it is.

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    Quote Originally Posted by 5.0THIS View Post
    Yeah, and if I wanted a good head I'd go with an AFR aftermarket head, because they have more potential. At that point who gives a fuck what LTx port it is.
    oo, i care ,i care!

  17. #17
    LTX N20LT4's Avatar
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    Quote Originally Posted by Cayenne97 View Post
    N20LT4 being one example that made well over 500rwhp naturally-aspirated with a set of 227 LT4 heads. LT4 > LT1.
    Yup, 509rwhp w/ 215cc runners (not 227, damn Cayenne ). That car was a blast to drive, amazing midrange and top-end pull!

  18. #18
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    Quote Originally Posted by N20LT4 View Post
    Yup, 509rwhp w/ 215cc runners (not 227, damn Cayenne ). That car was a blast to drive, amazing midrange and top-end pull!
    what size bottom end? redline?

  19. #19
    LTX N20LT4's Avatar
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    Quote Originally Posted by side2000 View Post
    what size bottom end? redline?
    It was a 385, just under 7000.

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    very nice.

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