Crate LS3 525 swap in C5 opinions
06-08-2018, 02:14 PM
#41
Some Tony Mamos heads, low lash roadrace cam, proper valvetrain, proper intake, long tubes, good forged rotating assembly and youre there
Last edited by D K; 06-08-2018 at 02:14 PM.
06-09-2018, 11:15 AM
#43
Drifting
06-13-2018, 08:34 PM
#44
8th Gear
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Wow, that is really impressive how the LS3 pulls! And that is only 410 at the wheels. 465 from a crate 525 should be more than enough for the street and track day.
[QUOTE=crimlwC6;1597365235]LS7 is nearly twice as much as a crate LS3. Do whatever you want, but you ain't getting a roadrace reliable 500 hp LS6 for cheap. The best apples to apples I can give you is my car, same driver, same track:QUOTE]
[QUOTE=crimlwC6;1597365235]LS7 is nearly twice as much as a crate LS3. Do whatever you want, but you ain't getting a roadrace reliable 500 hp LS6 for cheap. The best apples to apples I can give you is my car, same driver, same track:QUOTE]
06-13-2018, 09:42 PM
#45
Melting Slicks
06-14-2018, 07:50 AM
#46
Drifting
We went the stroker 383 LS1 route in one of our tube frame cars several years ago and it turned out to be a nice torquey, easy to drive road race motor. We used a Callies Compstar crank and rods and Mahle pistons (about 2500), we had Advanced Induction port a set of our 243 heads (1000) and we used a Comp cam of about .600 lift. With about 11 to 1 compression it dynoed at 550 plus HP and 500 torque. Super flat torque curve and pulls hard to 6800 or so. Good enough to run 1:53 at Daytona and whip many higher priced motors. The 383's don't get a lot of love but I can attest that on track they can be very effective.
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yooper (06-17-2018)
06-19-2018, 10:05 AM
#48
Drifting
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63Corvette (06-19-2018)
06-19-2018, 10:07 AM
#49
Drifting
[QUOTE=Norbit2;1597401025]Wow, that is really impressive how the LS3 pulls! And that is only 410 at the wheels. 465 from a crate 525 should be more than enough for the street and track day.
Agree on all counts! 
06-20-2018, 11:57 AM
#51
Im building one right now actually...
Again, Im not saying the Gen3is better than the Gen4 in any way....jsut saying that to upgrade a stock LS6 might be a better option to upgrade to a Gen4, thats all.
I, myslf have a couple of LS6’s laying around and I like the advantage of being able to use old/cycled out Nascar technology for cheap!
It is NOT that hard to get to 500whp in a gen3 motor. Absolutely doable and relatively cheap.
Also, the LS3 is almost 10% bigger in displacement, so you start off with an extra ~50hp/tq in the LS3s favor just from displacement.
I also have parts from an old Daytona Prototype engine with offset liners to clear big valves -so it is possible to make very big power out of those engines!
Starting from scratch- I would definitely go with LS3.
Upgrading - I would stick with the LS6.
Also, of note: if you ever have an opportunity to test cathedral port and rectangular ports back to back (at the track), you will notice they feel different.
A nice set of cathedral port heads will pull very nicely out of a corner.
My $.02
06-21-2018, 07:27 AM
#52
Melting Slicks
Im building one right now actually...
Again, Im not saying the Gen3is better than the Gen4 in any way....jsut saying that to upgrade a stock LS6 might be a better option to upgrade to a Gen4, thats all.
I, myslf have a couple of LS6’s laying around and I like the advantage of being able to use old/cycled out Nascar technology for cheap!
It is NOT that hard to get to 500whp in a gen3 motor. Absolutely doable and relatively cheap.
Also, the LS3 is almost 10% bigger in displacement, so you start off with an extra ~50hp/tq in the LS3s favor just from displacement.
I also have parts from an old Daytona Prototype engine with offset liners to clear big valves -so it is possible to make very big power out of those engines!
Starting from scratch- I would definitely go with LS3.
Upgrading - I would stick with the LS6.
Also, of note: if you ever have an opportunity to test cathedral port and rectangular ports back to back (at the track), you will notice they feel different.
A nice set of cathedral port heads will pull very nicely out of a corner.
My $.02
Again, Im not saying the Gen3is better than the Gen4 in any way....jsut saying that to upgrade a stock LS6 might be a better option to upgrade to a Gen4, thats all.
I, myslf have a couple of LS6’s laying around and I like the advantage of being able to use old/cycled out Nascar technology for cheap!
It is NOT that hard to get to 500whp in a gen3 motor. Absolutely doable and relatively cheap.
Also, the LS3 is almost 10% bigger in displacement, so you start off with an extra ~50hp/tq in the LS3s favor just from displacement.
I also have parts from an old Daytona Prototype engine with offset liners to clear big valves -so it is possible to make very big power out of those engines!
Starting from scratch- I would definitely go with LS3.
Upgrading - I would stick with the LS6.
Also, of note: if you ever have an opportunity to test cathedral port and rectangular ports back to back (at the track), you will notice they feel different.
A nice set of cathedral port heads will pull very nicely out of a corner.
My $.02
If it's so "easy" maybe you can sell a zipped up package to install, kinda like frozen pizza.
The average head cam LS1/6 makes 430-440rwhp which is 500-520 at the crank. From 450 rwhp on up the higher you go the more uncommon they get. And to say it's "cheap" is a good laugh also.
LS3 is a better starting point to make power for sure, but it is widely known they are much more prone to oiling issues as grip levels rise over the LS1/6 platform.
And what series in NASCAR uses old "cycled out" LS parts? To my knowledge the truck series just started using the LS platform just recently.
The old Daytona Prototype engines didn't really have any to secrete "mojo" stuff in them, they made around 500hp at the crank if memory serves and most teams used basically stock stuff to get there.
Last edited by FASTFATBOY; 06-21-2018 at 02:01 PM.
06-21-2018, 01:18 PM
#53
Drifting
With regard to, "what Nascar series uses LS motors, the Nascar K&N Series were using LS2's with ported heads and a .600 ish lift cam. They were making 600 plus HP, twisting them about 7600. They supplanted the old 18 degree motors I believe. About 2012 Adam Andretti and AJ Henriksen brought one to race with us in SCCA/V8Stockcar at Homestead and it was FAST!
Last edited by bosco022; 06-21-2018 at 01:21 PM.
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63Corvette (06-28-2018),
bosco022 (06-22-2018)
06-21-2018, 04:13 PM
#55
Melting Slicks
06-21-2018, 04:54 PM
#56
Point being that you CAN make power ot of an LS6 although its not as easy as with an LS3 which starts off with 10% more displacement.
06-21-2018, 06:21 PM
#57
How do C5 guys go from 24 tooth reluctor to 50? tooth LS3? Is there just an add on controler box? Use C6 PCM and wiring harness? Crack open the LS3 shortblock and change the wheel on the crank?
Thanks!
Thanks!
06-21-2018, 06:57 PM
#58
Melting Slicks
06-21-2018, 06:58 PM
#59
Melting Slicks
You can't make that power on 93 octane with a 7,000 rpm redline lol....AKA a "streetcar"
Last edited by FASTFATBOY; 06-21-2018 at 07:00 PM.