[Waggs]

So I recently just bought a 2017 ZL1 w/ 29,000 mi. I was planning on keeping as was, which is a rot fab CAI, and 1 7/8” long tube headers and full exhaust. But it was running lean I guess when I bought it and cause damage in cylinder 1 around 30,000 mi.
So now i am looking at either getting a 416 ci short block from weapon x, or just sending mine off. We are also going to cam it, port and polished heads, different supercharger pulleys, go to the big gulp Roto fab CAI, and a better clutch.
Would I be better off sending my block off, or getting one from weapon x. And what kind of power should I expect.

[JSH]

Originally Posted by Waggs

So I recently just bought a 2017 ZL1 w/ 29,000 mi. I was planning on keeping as was, which is a rot fab CAI, and 1 7/8” long tube headers and full exhaust. But it was running lean I guess when I bought it and cause damage in cylinder 1 around 30,000 mi.
So now i am looking at either getting a 416 ci short block from weapon x, or just sending mine off. We are also going to cam it, port and polished heads, different supercharger pulleys, go to the big gulp Roto fab CAI, and a better clutch.
Would I be better off sending my block off, or getting one from weapon x. And what kind of power should I expect.

I would do the 416, and all of the mods necessary to take full advantage of it

[KingLT1]

The 416 imo isn't worth it unless you plan on doing a centrifugal supercharger which will net some bottom end torque back that you lose going from PD to Centri. Otherwise, you are compounding more torque on top of what the little 1.74 supercharger already makes and shifting the power curve to the left. Lehman's terms that is too much displacement for the stock supercharger. Save your money and just rebuild the 376. reuse the crank and rods...make sure to upgrade the thrust bearing. That is the weakest link in the LT engines and tend to allow the crank to walk on Supercharger builds north of 850whp.

[Joshinator99]

Originally Posted by Waggs

So I recently just bought a 2017 ZL1 w/ 29,000 mi. I was planning on keeping as was, which is a rot fab CAI, and 1 7/8” long tube headers and full exhaust. But it was running lean I guess when I bought it and cause damage in cylinder 1 around 30,000 mi.
So now i am looking at either getting a 416 ci short block from weapon x, or just sending mine off. We are also going to cam it, port and polished heads, different supercharger pulleys, go to the big gulp Roto fab CAI, and a better clutch.
Would I be better off sending my block off, or getting one from weapon x. And what kind of power should I expect.

Originally Posted by KingLT1

The 416 imo isn't worth it unless you plan on doing a centrifugal supercharger which will net some bottom end torque back that you lose going from PD to Centri. Otherwise, you are compounding more torque on top of what the little 1.74 supercharger already makes and shifting the power curve to the left. Lehman's terms that is too much displacement for the stock supercharger. Save your money and just rebuild the 376. reuse the crank and rods...make sure to upgrade the thrust bearing. That is the weakest link in the LT engines and tend to allow the crank to walk on Supercharger builds north of 850whp.

Agreed on the 376 if keeping the LT4 supercharger.

LME for the engine is the first choice. Katech does a nice job too.

[JSH]

Originally Posted by KingLT1

The 416 imo isn't worth it unless you plan on doing a centrifugal supercharger which will net some bottom end torque back that you lose going from PD to Centri. Otherwise, you are compounding more torque on top of what the little 1.74 supercharger already makes and shifting the power curve to the left. Lehman's terms that is too much displacement for the stock supercharger. Save your money and just rebuild the 376. reuse the crank and rods...make sure to upgrade the thrust bearing. That is the weakest link in the LT engines and tend to allow the crank to walk on Supercharger builds north of 850whp.

Yea, I would do whatever Pray is doing with the 416, ProCharger and other mods

[Waggs]

I do plan on going with the magnuson 2650 in the future I figured this would be a good foundation for it. But idk thats why im asking

[ZL1Atlanta]

Originally Posted by Waggs

I do plan on going with the magnuson 2650 in the future I figured this would be a good foundation for it. But idk thats why im asking

The 2650 likes the extra engine size, so if that’s definitely the plan, I’d do the 416.

[sr71bb]

Originally Posted by Waggs

I do plan on going with the magnuson 2650 in the future I figured this would be a good foundation for it. But idk thats why im asking

Well its already been posted but the BEST engine builder out there is LME and there are no close seconds. The fastest and MOST reliable streetable engines in the world. LME 416 would be the way to go with a full effort 2650. LME's precision on their engines puts them in a league of their own.

[laynlo15]

Originally Posted by Waggs

I do plan on going with the magnuson 2650 in the future I figured this would be a good foundation for it. But idk thats why im asking

I'd agree with Jason Zl1Atlanta about the 416 and the 2650. Both will handle all your wallet allows you. Plan of buying a set of drag radials for the street, you'll for sure need them. Good luck on your choice of short blocks.

[JSH]

Originally Posted by sr71bb

Well its already been posted but the BEST engine builder out there is LME and there are no close seconds.

Just because someone posts something doesn't necessarily mean it's so. I seriously doubt that there is a "best engine builder." How would we determine that? I assume we're talking LT4 engines.

As for LME, what does their LT4 engine resume look like? Do they have a bunch of national records or series championships or what? I'll concede that they're good, but doesn't Pray have most of the fastest LT4 cars?

I'm 100% sure that there's at least one Vengeance engine owner who will disagree with your LME statement. Also, Pratt Miller's GT4 engines must be as good as it gets.

How would we determine that?

[KingLT1]

Originally Posted by Waggs

I do plan on going with the magnuson 2650 in the future I figured this would be a good foundation for it. But idk thats why im asking

Had you said initially that a 2650 was in the plans I would have basically said what ZL1 Atlanta did. The 2650 will feed more cubes. I personally would do a 427 over 416 but either way it will make a stout combo.

Originally Posted by JSH

Just because someone posts something doesn't necessarily mean it's so. I seriously doubt that there is a "best engine builder." How would we determine that? I assume we're talking LT4 engines.

As for LME, what does their LT4 engine resume look like? Do they have a bunch of national records or series championships or what? I'll concede that they're good, but doesn't Pray have most of the fastest LT4 cars?

I'm 100% sure that there's at least one Vengeance engine owner who will disagree with your LME statement. Also, Pratt Miller's GT4 engines must be as good as it gets.

How would we determine that?

LME is one of the top engine builders in the Country for sure. They don't build cars, they specifically build engines for a lot of these shops. Justing Keith has the fastest 6th gen @ 7.5 1/4 mile with a twin turbo LME 39x ci LTx engine.

[2018ZL1]

Originally Posted by KingLT1

The 416 imo isn't worth it unless you plan on doing a centrifugal supercharger which will net some bottom end torque back that you lose going from PD to Centri. Otherwise, you are compounding more torque on top of what the little 1.74 supercharger already makes and shifting the power curve to the left. Lehman's terms that is too much displacement for the stock supercharger. Save your money and just rebuild the 376. reuse the crank and rods...make sure to upgrade the thrust bearing. That is the weakest link in the LT engines and tend to allow the crank to walk on Supercharger builds north of 850whp.

Yes! Make sure you upgrade that damn thrust bearing!!!!

[laynlo15]

Originally Posted by 2018ZL1

Yes! Make sure you upgrade that damn thrust bearing!!!!

It depends on the HP your going to make but if your going to have someone build a forged engine this guy is exactly right. Yes it will cost you some more bucks but it may save you later. Mine junk the thrust bearing on my Manley forged motor on my 16ss, don't know that it would have saved my motor since it broke the crank internally but do what you can now and build it right.