Generation IV Internal Engine - Max RPM LS3 Dry sump
07-23-2012, 10:35 PM
Looking to dry sump, wondering how hard i could turn a LS3 with good internals?
Ive been searching for a max, but couldnt find an answer without the oil pump being in question
07-23-2012, 10:40 PM
You can squeeze 7500 without going too expensive on the valve train and rods/bolts. 8000 I think would get a bit spendy. Looking at Jesel parts and a solid roller I think.
07-23-2012, 11:09 PM
Can the block handle 8500? been in talks with SI valves some, trying to figure out whats best in the valve train., and i would think a good 4340 crank and rods with good bolts should handle it.
Been trying to decide on a cam, going to call comp this week and pick their brains if they will let me.
Which company sales good high quality lifters to fit a LS3/7 block
I think im correct to assume the 3 and 7 are the same block now, have to recheck my part numbers though
07-23-2012, 11:20 PM
No the LS3 and LS7 blocks are different.
07-24-2012, 01:21 AM
They are a bit different. 4.125" vs 4.060" bore. For 8500 the block itself will handle it but the bearings and oiling have to be dead on. I think the race motors run looser bearing tolerances and really thick oil. At 8500 I'm pretty sure solid lifters would be required along with ultra light/strong adjustable rockers and really good springs with the lightest valves one can get. Hollow stem intake and sodium exhaust.
07-24-2012, 09:56 AM
thanks for your time, I checked and i was wrong like you all said. But i will keep you updated on how i choose to go.
07-24-2012, 02:55 PM
Someone said put a 4340 crank into a motor that comes from GM with a 4340 crank? Sometimes you wonder where the answers come from. I'm in the middle of a drysump LS3 build, went with Mahle pistons and Manley H beam rods. The rotating weight is around 100grams less than GM parts and at least twice as strong. Only problem I see with high RPM LS motor is with small scavenger section of GM oil pump, need to look into Katech oil pump and port oil restrictions in block oil passages and oil pan (especially where oil filter mounts.)
My only concern with my build right now is timing chain assembly even with C5R chain, it seems week. I may try to fab in dual roller chain setup if it will fit. Right now I doing header fabrication.
07-24-2012, 04:58 PM
07-25-2012, 12:45 AM
If someone wants a factory dry sump setup, I have a LS7 crank, nice oil pump, front cover and LS7 oil pan, $1000 would buy all of it. I decided against building a 418 motor. Staying with LS3 for present build.
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