Why no LS7 shortblocks using stock rotating assy?
Why no LS7 shortblocks using stock rotating assy? Looking around, a few places out there are using the LS7 block or other, same bore, sleeved blocks to run 427's. So far, I've yet to see anyone building a 427 shortblock using the stock crank, rods, pistons, etc. (i.e. a full stock rotating assembly)
What is the reason for this? Are these parts not available? Are they too expensive? Are they crap?
What is the reason for this? Are these parts not available? Are they too expensive? Are they crap?
On The Tree
Joined: Aug 2004
Posts: 152
Likes: 0
If you're going to spend several+ grand on a block alone, why not spring the extra couple for a quality, long stroke rotating assembly?
That would be like buying a new Escalade without air conditioning to save a few bucks.
That would be like buying a new Escalade without air conditioning to save a few bucks.
TECH Regular
Joined: Nov 2005
Posts: 459
Likes: 0
From: Arlington, TN
On average the LS7 block goes for what 3k just for a bare block. compare that to the LS2 block or the L92 block which go for well under 2k.
The Ti Connecting rod's are expensive as well compared to a set of forged rods (Calies, Eagle, and even Lunati's are cheaper then the LS7's Ti Rods).
The LS7 crank is for dry sump (external pump) and most aftermarket cranks are for internal wet sump setups (then again so are LS1's LS2's most of GM's Gen 3/4 motors).
If you want to drop a 427 into a 4th gen Fbody and still be able to use most of the LS1 parts that came with the car (or aftermarket parts made for that car) you would probably need to use a crank made for the wet sump. Then you cold use the LS1 Fbody style pans, LS6 or L92 oil pumps, etc.
Right now the guys over at ls1gto are putting together a LS7 GTO for a fallen member. They are having the cross member tweaked/torched/cut to work with the LS7's external oiling setup. It would have been easier to just drop in a 4" LS1 stroker crank and have the rotating assembly balanced to the new crank (since the crank had to come out of the motor anyway to have a 24x timing wheel installed.
This way they wouldn't have to touch the cross member and could use alot of the material that the gto came with originally (oil pan and cam cover) and use a higher flowing L92 oil pump and still have a wet sump setup that would look very close to stock (both looking under the hood and looking from the bottom with the skid plate off).
Oh yeah I forgot about the balancer, yeah your LS1 based balance may not fit on the longer snout of the LS7 crank. Well it would fit but it would not line up with the other pulleys for your motor.
In a couple of months when GM is suppose to reduce the price of the LS7 bare block you will probably see more assemblies (aftermarket crate engines) based on it.
The Ti Connecting rod's are expensive as well compared to a set of forged rods (Calies, Eagle, and even Lunati's are cheaper then the LS7's Ti Rods).
The LS7 crank is for dry sump (external pump) and most aftermarket cranks are for internal wet sump setups (then again so are LS1's LS2's most of GM's Gen 3/4 motors).
If you want to drop a 427 into a 4th gen Fbody and still be able to use most of the LS1 parts that came with the car (or aftermarket parts made for that car) you would probably need to use a crank made for the wet sump. Then you cold use the LS1 Fbody style pans, LS6 or L92 oil pumps, etc.
Right now the guys over at ls1gto are putting together a LS7 GTO for a fallen member. They are having the cross member tweaked/torched/cut to work with the LS7's external oiling setup. It would have been easier to just drop in a 4" LS1 stroker crank and have the rotating assembly balanced to the new crank (since the crank had to come out of the motor anyway to have a 24x timing wheel installed.
This way they wouldn't have to touch the cross member and could use alot of the material that the gto came with originally (oil pan and cam cover) and use a higher flowing L92 oil pump and still have a wet sump setup that would look very close to stock (both looking under the hood and looking from the bottom with the skid plate off).
Oh yeah I forgot about the balancer, yeah your LS1 based balance may not fit on the longer snout of the LS7 crank. Well it would fit but it would not line up with the other pulleys for your motor.
In a couple of months when GM is suppose to reduce the price of the LS7 bare block you will probably see more assemblies (aftermarket crate engines) based on it.
Okay, so the crank is incompatable with wet sump. That pretty much explains it. If the crank isn't used, then the rods, pistons, etc can't easily be used.
Thank you, Bring The Noise. I knew I had heard that before but couldn't find it in any search.
Thank you, Bring The Noise. I knew I had heard that before but couldn't find it in any search.
Originally Posted by Start2Fabrication
If you're going to spend several+ grand on a block alone, why not spring the extra couple for a quality, long stroke rotating assembly?
Launching!
Joined: Mar 2004
Posts: 231
Likes: 0
From: Exton, Pennsylvania
Originally Posted by black_knight
As above, it's not a quality issue.
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yea.. titanium rods are sub par :roll eyes:
fact is that the LS7 parts are so good they are priced out of the range of most people. Forged H or I beam rods are actualy cheaper and as stated LS7 crank dosent work with wet sump.
fact is that the LS7 parts are so good they are priced out of the range of most people. Forged H or I beam rods are actualy cheaper and as stated LS7 crank dosent work with wet sump.
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Originally Posted by Start2Fabrication
even if it could be done, putting stock parts into a premium block isn't a waste of time? My point stands.
People, if you don't know what you're talking about, don't post up replies to threads like this.
Originally Posted by GMW-CSL
It's easy to modify the awsome, bullet-proof, relatively cheap, LS7 crank to run it wet-sump.
Staging Lane
Joined: Aug 2006
Posts: 91
Likes: 0
From: under the hood
Originally Posted by black_knight
It is? Who has done this and what did it cost? Do you know a machine shop that is offering this?
