N/A 434 LSX Build
02-06-2009, 12:28 PM
#1
N/A 427 LSX Build New motor build:
427 LSX
GMPP LSX Iron Block (w/LSX specific machining for improved oiling)
4.125" Wiseco Forged Pistons w/brushed tops - 11.6:1 SCR
Sonny Bryant 4.00" LS Crank
Oliver Billet Super Speedway 6.125" Rods
Stock GM LS7 heads - milled .015" (PSI springs/Katech Retainers .700 lift)
Stock GM LS7 intake touched up - w/ LS7 injectors
Felpro MLS Head gaskets
Custom Comp Cam - spec'ed by me:
235/250 .657/.648 115+4 - Xtreme Energy LSL for intake / Xtreme Marine HL Big Block Journal for exhaust
Morel Link-Bar Hydraulic Roller Lifters
3/8" Custom Pushrods
JP Performance Double Roller LS2 timing chain
SLP Ported Oil Pump
I will continually update this thread as the build progresses. The motor is being blue-printed and built by Billy Briggs of Briggs Performance local here in Detroit. He was the lead engine builder at W2W. Mr. Briggs has built some of the top LS motors in the country including Tom Kempf's monster turbo motor. On top of that, he is a really AWESOME guy to talk to and deal with. Thanks to everyone who recommended him.
As many of you know from my last thread my old 427 threw a rod and demolished my entire motor, so I'm not looking back. Its a really big relief to know that this motor will LAST, compared to my last motor which had so many problems.
My last cam was a 242/256 (X-er/off the books "Renegade" lobes) and was not an easy task to tune, so I'm hoping this new cam that I spec'd will have much better street manners than my old since overlap drops from 23 to 12.5, and IVC is right at 48.5 so low end torque should be optimized on these LS7 heads. Power should be similar as my old setup, but I do understand I will have more parasitic loss due to the heavier rotating assembly, but the power will be made up by the increase in compression and cubes.
Share your thoughts!
427 LSX
GMPP LSX Iron Block (w/LSX specific machining for improved oiling)
4.125" Wiseco Forged Pistons w/brushed tops - 11.6:1 SCR
Sonny Bryant 4.00" LS Crank
Oliver Billet Super Speedway 6.125" Rods
Stock GM LS7 heads - milled .015" (PSI springs/Katech Retainers .700 lift)
Stock GM LS7 intake touched up - w/ LS7 injectors
Felpro MLS Head gaskets
Custom Comp Cam - spec'ed by me:
235/250 .657/.648 115+4 - Xtreme Energy LSL for intake / Xtreme Marine HL Big Block Journal for exhaust
Morel Link-Bar Hydraulic Roller Lifters
3/8" Custom Pushrods
JP Performance Double Roller LS2 timing chain
SLP Ported Oil Pump
I will continually update this thread as the build progresses. The motor is being blue-printed and built by Billy Briggs of Briggs Performance local here in Detroit. He was the lead engine builder at W2W. Mr. Briggs has built some of the top LS motors in the country including Tom Kempf's monster turbo motor. On top of that, he is a really AWESOME guy to talk to and deal with. Thanks to everyone who recommended him.
As many of you know from my last thread my old 427 threw a rod and demolished my entire motor, so I'm not looking back. Its a really big relief to know that this motor will LAST, compared to my last motor which had so many problems.
My last cam was a 242/256 (X-er/off the books "Renegade" lobes) and was not an easy task to tune, so I'm hoping this new cam that I spec'd will have much better street manners than my old since overlap drops from 23 to 12.5, and IVC is right at 48.5 so low end torque should be optimized on these LS7 heads. Power should be similar as my old setup, but I do understand I will have more parasitic loss due to the heavier rotating assembly, but the power will be made up by the increase in compression and cubes.
Share your thoughts!
Last edited by Haans249; 02-28-2009 at 12:57 PM. Reason: building 427 now, not 434.
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Saber-1 (06-03-2022)
02-06-2009, 01:41 PM
#7
New motor build:
434 LSX
GMPP LSX Iron Block (w/LSX specific machining for improved oiling)
4.155" Custom LS7 JE Pistons - 11.6:1 SCR
Sunny Bryant 4.00" LS Crank
Oliver Billet Super Speedway 6.125" Rods
Stock GM LS7 heads - milled .015" (PSI springs/Katech Retainers .700 lift)
Stock GM LS7 intake touched up - w/ LS7 injectors
Felpro MLS Head gaskets
Custom Comp Cam - spec'ed by me:
235/250 .657/.648 115+4 - Xtreme Energy LSL for intake / Xtreme Marine HL Big Block Journal for exhaust
Morel Link-Bar Hydraulic Roller Lifters
3/8" Custom Pushrods
JP Performance Double Roller LS2 timing chain
SLP Ported Oil Pump
I will continually update this thread as the build progresses. The motor is being blue-printed and built by Billy Briggs of Briggs Performance local here in Detroit. He was the lead engine builder at W2W. Mr. Briggs has built some of the top LS motors in the country including Tom Kempf's monster turbo motor. On top of that, he is a really AWESOME guy to talk to and deal with. Thanks to everyone who recommended him.
As many of you know from my last thread my old 427 threw a rod and demolished my entire motor, so I'm not looking back. Its a really big relief to know that this motor will LAST, compared to my last motor which had so many problems.
My last cam was a 242/256 (X-er/off the books "Renegade" lobes) and was not an easy task to tune, so I'm hoping this new cam that I spec'd will have much better street manners than my old since overlap drops from 23 to 12.5, and IVC is right at 48.5 so low end torque should be optimized on these LS7 heads. Power should be similar as my old setup, but I do understand I will have more parasitic loss due to the heavier rotating assembly, but the power will be made up by the increase in compression and cubes.
Share your thoughts!
434 LSX
GMPP LSX Iron Block (w/LSX specific machining for improved oiling)
4.155" Custom LS7 JE Pistons - 11.6:1 SCR
Sunny Bryant 4.00" LS Crank
Oliver Billet Super Speedway 6.125" Rods
Stock GM LS7 heads - milled .015" (PSI springs/Katech Retainers .700 lift)
Stock GM LS7 intake touched up - w/ LS7 injectors
Felpro MLS Head gaskets
Custom Comp Cam - spec'ed by me:
235/250 .657/.648 115+4 - Xtreme Energy LSL for intake / Xtreme Marine HL Big Block Journal for exhaust
Morel Link-Bar Hydraulic Roller Lifters
3/8" Custom Pushrods
JP Performance Double Roller LS2 timing chain
SLP Ported Oil Pump
I will continually update this thread as the build progresses. The motor is being blue-printed and built by Billy Briggs of Briggs Performance local here in Detroit. He was the lead engine builder at W2W. Mr. Briggs has built some of the top LS motors in the country including Tom Kempf's monster turbo motor. On top of that, he is a really AWESOME guy to talk to and deal with. Thanks to everyone who recommended him.
As many of you know from my last thread my old 427 threw a rod and demolished my entire motor, so I'm not looking back. Its a really big relief to know that this motor will LAST, compared to my last motor which had so many problems.
My last cam was a 242/256 (X-er/off the books "Renegade" lobes) and was not an easy task to tune, so I'm hoping this new cam that I spec'd will have much better street manners than my old since overlap drops from 23 to 12.5, and IVC is right at 48.5 so low end torque should be optimized on these LS7 heads. Power should be similar as my old setup, but I do understand I will have more parasitic loss due to the heavier rotating assembly, but the power will be made up by the increase in compression and cubes.
Share your thoughts!
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02-06-2009, 02:12 PM
#9
IF you don't have an LSX block yet, in a couple weeks, if I make the decision to go another route, a local guy said he wants to buy my LSX block. If he doesn't take it when I'm ready to get rid of it, it'll be for sale. $1695 + shipping, I paid $1995 for it. Its already been completely checked, its a perfect one.
Thanks! If you had it last week I would probably have driven out to pick it up, but I already got my LSX block on Tuesday.
Lets not worry about the cost of this build guys, as its not astronomical. The parts are yes, but people who know people had found some people trying to get rid of some parts. I'm just posting for all interested in discussion.
02-06-2009, 04:28 PM
#16
02-07-2009, 09:20 AM
#17
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02-07-2009, 03:15 PM
#18
Here is why it blew: https://ls1tech.com/forums/generatio...7-carnage.html
02-07-2009, 05:58 PM
#19
I just checked out those cams just now. It does look very similar to the one I spec'ed, but it uses LSL lobes for both the intake and exhaust. I wanted to pick up a softer exhaust lobe than the one above to improve driveability (slower ramp rates, better valve control, slightly less lift) and increase lower end torque, and thats why I went with the BBC Marine HL lobe for exhaust. I also went with the narrower ICL to also build more torque with a IVC closer to 48 as i was explained by PatrickG, and with a wider LSA for less overlap at 50thou lift.
Last edited by Haans249; 02-07-2009 at 06:17 PM.