GM 5.3 'Ultimate' Engine Build
#1
GM 5.3 'Ultimate' Engine Build
Hello All,
I'm a mechanic and tuner from the car world who has recently come to the world of trucks-
I have a 2002 'burban 5.3L 'Z' motor (flex fuel) that we added a Procharger to about 6 months ago- (the truck already had headers, true dual exhaust, hypertech tuning, throttle body spacer etc.)
This week injector #7 went bad and I burnt a hole in #7 piston under full boost (8psi).
So now the motor comes out and my questions begin:
#1- Where can I find forged pistons for this engine? Have any of you had them made yet? I haven't called JE or CP yet to see if they have already made them.
#2 Does anybody have any idea what the actual difference is between the LM7 and the L59 engines?
#3- Fasteners- i have a big budget for this build and would like to put on any ARP fasteners I can find for the rods, heads and mains- anybody know what fits from other GM motors?
#4- has anyone over-bored these motors? Can I go out to a 5.7L piston size?
Thanks Guys,
I look forward to talking with you more and showing you how this beast turns out!
I'm a mechanic and tuner from the car world who has recently come to the world of trucks-
I have a 2002 'burban 5.3L 'Z' motor (flex fuel) that we added a Procharger to about 6 months ago- (the truck already had headers, true dual exhaust, hypertech tuning, throttle body spacer etc.)
This week injector #7 went bad and I burnt a hole in #7 piston under full boost (8psi).
So now the motor comes out and my questions begin:
#1- Where can I find forged pistons for this engine? Have any of you had them made yet? I haven't called JE or CP yet to see if they have already made them.
#2 Does anybody have any idea what the actual difference is between the LM7 and the L59 engines?
#3- Fasteners- i have a big budget for this build and would like to put on any ARP fasteners I can find for the rods, heads and mains- anybody know what fits from other GM motors?
#4- has anyone over-bored these motors? Can I go out to a 5.7L piston size?
Thanks Guys,
I look forward to talking with you more and showing you how this beast turns out!
#6
Hello All,
...This week injector #7 went bad and I burnt a hole in #7 piston under full boost (8psi).
So now the motor comes out and my questions begin:
#1- Where can I find forged pistons for this engine? Have any of you had them made yet? I haven't called JE or CP yet to see if they have already made them.
#2 Does anybody have any idea what the actual difference is between the LM7 and the L59 engines?
#3- Fasteners- i have a big budget for this build and would like to put on any ARP fasteners I can find for the rods, heads and mains- anybody know what fits from other GM motors?
#4- has anyone over-bored these motors? Can I go out to a 5.7L piston size?
Thanks Guys,
I look forward to talking with you more and showing you how this beast turns out!
...This week injector #7 went bad and I burnt a hole in #7 piston under full boost (8psi).
So now the motor comes out and my questions begin:
#1- Where can I find forged pistons for this engine? Have any of you had them made yet? I haven't called JE or CP yet to see if they have already made them.
#2 Does anybody have any idea what the actual difference is between the LM7 and the L59 engines?
#3- Fasteners- i have a big budget for this build and would like to put on any ARP fasteners I can find for the rods, heads and mains- anybody know what fits from other GM motors?
#4- has anyone over-bored these motors? Can I go out to a 5.7L piston size?
Thanks Guys,
I look forward to talking with you more and showing you how this beast turns out!
#1) 5.3 forged pistons unsure, also, consider Mahle. Myself, I love the 5.3.
#2) If L59 is the flex fuel vers. of LM7, it's got bigger injectors
#3) ARP has em that fit LS motors.
#4) Yes on both counts.
Welcome.
Nice plug Ben.
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#9
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There is no good reason, even if you have a free 5.3l block to build a forged bottom end one rather than boring it to 3.9" (ls1 type cubes). Staying with a 5.3l bore is really bad decision in every way.
Pickup a 6.0 block otherwise and its a better choice for all intensive purposes.
Pickup a 6.0 block otherwise and its a better choice for all intensive purposes.