LQ4 370 Piston/Rod Questions
05-10-2017, 08:59 AM
#1
LQ4 370 Piston/Rod Questions Machine shop has to take my LQ4 to .030 over to clean up the cylinders. Ive been shopping for about 24 hours for a good direct replacement for the piston but have that the GOOD replacements require a 6.125" rod as opposed to the stock 6.098" rod.
Id like to stay under $800 for rod and piston combos but am not having any luck. Is this how it is or am I missing something?
I need to keep as close to stock compression ratio of 9.45:1 as possible.
I'll take any advice or help I can get.
Id like to stay under $800 for rod and piston combos but am not having any luck. Is this how it is or am I missing something?
I need to keep as close to stock compression ratio of 9.45:1 as possible.
I'll take any advice or help I can get.
05-13-2017, 08:20 PM
#2
TECH Fanatic
iTrader: (5)
DSS flat top 5cc forged from Tick $399, Scat 6.125" I-beams from the WS6store, $298
I just did this with a 6.0 .030 block I had laying around, assembly at the machine shop being balanced right now. Mahle file fit rings from Summit, $111, all of these items shipped for free and are an upgrade over the OEM stuff, the rods have 7/16 ARP bolts, bushed for floating pins, have hollow dowels to positively locate the caps. The pistons are a hardy 500 grams ea. and have deep valve reliefs so just about any common shelf cam is going to work without PTV issues . This is about $806 for a semi forged bottom end. If you can do better, let me know.
I just did this with a 6.0 .030 block I had laying around, assembly at the machine shop being balanced right now. Mahle file fit rings from Summit, $111, all of these items shipped for free and are an upgrade over the OEM stuff, the rods have 7/16 ARP bolts, bushed for floating pins, have hollow dowels to positively locate the caps. The pistons are a hardy 500 grams ea. and have deep valve reliefs so just about any common shelf cam is going to work without PTV issues . This is about $806 for a semi forged bottom end. If you can do better, let me know.
Last edited by 64post; 05-14-2017 at 09:44 AM.
05-15-2017, 07:30 AM
#3
Machine shop has to take my LQ4 to .030 over to clean up the cylinders. Ive been shopping for about 24 hours for a good direct replacement for the piston but have that the GOOD replacements require a 6.125" rod as opposed to the stock 6.098" rod.
Id like to stay under $800 for rod and piston combos but am not having any luck. Is this how it is or am I missing something?
I need to keep as close to stock compression ratio of 9.45:1 as possible.
I'll take any advice or help I can get.
Id like to stay under $800 for rod and piston combos but am not having any luck. Is this how it is or am I missing something?
I need to keep as close to stock compression ratio of 9.45:1 as possible.
I'll take any advice or help I can get.
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Homer_Simpson (12-25-2021)
05-15-2017, 08:43 AM
#4
DSS flat top 5cc forged from Tick $399, Scat 6.125" I-beams from the WS6store, $298
I just did this with a 6.0 .030 block I had laying around, assembly at the machine shop being balanced right now. Mahle file fit rings from Summit, $111, all of these items shipped for free and are an upgrade over the OEM stuff, the rods have 7/16 ARP bolts, bushed for floating pins, have hollow dowels to positively locate the caps. The pistons are a hardy 500 grams ea. and have deep valve reliefs so just about any common shelf cam is going to work without PTV issues . This is about $806 for a semi forged bottom end. If you can do better, let me know.
I just did this with a 6.0 .030 block I had laying around, assembly at the machine shop being balanced right now. Mahle file fit rings from Summit, $111, all of these items shipped for free and are an upgrade over the OEM stuff, the rods have 7/16 ARP bolts, bushed for floating pins, have hollow dowels to positively locate the caps. The pistons are a hardy 500 grams ea. and have deep valve reliefs so just about any common shelf cam is going to work without PTV issues . This is about $806 for a semi forged bottom end. If you can do better, let me know.
Also, the more I sat around and researched the more Im comtemplating full forged lower and slightly better parts.
05-16-2017, 01:19 AM
#5
TECH Fanatic
iTrader: (5)
Yeah but a full forged bottom end requires a 4340 crank and that won't be cheap, even in stock stroke. The stock cranks are stout as hell hi nodular iron and are commonly used in FI applications with 800+RWHP, got to ask yourself if it's worth it. If so, just buy a complete balanced rotating assembly.
05-17-2017, 03:36 PM
#7
DSS flat top 5cc forged from Tick $399, Scat 6.125" I-beams from the WS6store, $298
I just did this with a 6.0 .030 block I had laying around, assembly at the machine shop being balanced right now. Mahle file fit rings from Summit, $111, all of these items shipped for free and are an upgrade over the OEM stuff, the rods have 7/16 ARP bolts, bushed for floating pins, have hollow dowels to positively locate the caps. The pistons are a hardy 500 grams ea. and have deep valve reliefs so just about any common shelf cam is going to work without PTV issues . This is about $806 for a semi forged bottom end. If you can do better, let me know.
I just did this with a 6.0 .030 block I had laying around, assembly at the machine shop being balanced right now. Mahle file fit rings from Summit, $111, all of these items shipped for free and are an upgrade over the OEM stuff, the rods have 7/16 ARP bolts, bushed for floating pins, have hollow dowels to positively locate the caps. The pistons are a hardy 500 grams ea. and have deep valve reliefs so just about any common shelf cam is going to work without PTV issues . This is about $806 for a semi forged bottom end. If you can do better, let me know.
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05-17-2017, 05:15 PM
#8
We have the stock hyper e pistons for both pressed and floating pin with std or file fit rings VERY cheap in 4.030. We also sell alot of the mahle power pak pistons which come in a 4.030 in alot of pin/rod length combos. They run $635 - $725 for rings pistons and pins. mahle recently came out with a brand new ring set. 1mm 1mm 2mm std oil. Its a serious ring for the price!
We also have quite a few stock/ forged rod options also.
We also have quite a few stock/ forged rod options also.
