[Saberscar223]

Alot of you have given me really good advice and here are my final options for Engine integrity when adding a Magnesun 2650. My goal is 700-750whp.

Plan A: I add the Magnesun 2650 and too high psi Port Injection and leave internals stock. Since I have a bigger cam as well I'm hoping Id be able to run full E85 on this setup.

Plan B: I add the Magnesun 2650, TSP drop in pistons and the LT4 fueling system and run 93.

Plan C: I just add the Magnesun 2650, keep the boost low and run 93, Ive been told that would be safe with the bigger cam and its also the cheapest option.

[Katech_Mike]

Originally Posted by Saberscar223

Alot of you have given me really good advice and here are my final options for Engine integrity when adding a Magnesun 2650. My goal is 700-750whp.

Plan A: I add the Magnesun 2650 and too high psi Port Injection and leave internals stock. Since I have a bigger cam as well I'm hoping Id be able to run full E85 on this setup. - This will likely not last long. 700RWHP+ is asking from trouble with stock bottom end

Plan B: I add the Magnesun 2650, TSP drop in pistons and the LT4 fueling system and run 93. - Stock cam will limit you to 650-675RWHP

Plan C: I just add the Magnesun 2650, keep the boost low and run 93, Ive been told that would be safe with the bigger cam and its also the cheapest option. - LT1 fuel system will further limit the power output. 525RWHP range from memory

See above in red.

[KingLT1]

Originally Posted by Katech_Mike

See above in red.

He already has an aftermarket cam.

[18.2SS.1LE]

Originally Posted by Saberscar223

Alot of you have given me really good advice and here are my final options for Engine integrity when adding a Magnesun 2650. My goal is 700-750whp.

Plan A: I add the Magnesun 2650 and too high psi Port Injection and leave internals stock. Since I have a bigger cam as well I'm hoping Id be able to run full E85 on this setup.

Plan B: I add the Magnesun 2650, TSP drop in pistons and the LT4 fueling system and run 93.

Plan C: I just add the Magnesun 2650, keep the boost low and run 93, Ive been told that would be safe with the bigger cam and its also the cheapest option.

Go with plan A, you'll have room to grow with the port injection if you decide to put some drop ins and a low side fuel system down the road. You'll be at the limit with that power on the SBE, especially with the torque the 2650 makes down low. Have someone reputable tune it!

[GreyGhost702]

I don't have any experience with the port injection systems, but I'm fairly certain even the 1LE pump won't support both DI & Port Injection on its own. Either beefing up the in-tank setup or running an Aux system is likely necessary.

I think your plan B is the best bet if you're on a strict budget. Would like to see Pistons AND Rods in that plan, though. Rods take quite a beating on PD setups. The OE rods have been proven to be soft, some shops have taken apart engines that hadn't failed but had rods that were tweaked. Though, probably softened up by detonation, which wouldn't happen if there's enough fuel and good fuel. It wouldn't hurt to have some fresh bearings to punish as well. The LT4 system will support some E and that's going to let you make consistent power as well.

[2023TwoSS]

Originally Posted by GreyGhost702

I don't have any experience with the port injection systems, but I'm fairly certain even the 1LE pump won't support both DI & Port Injection on its own. Either beefing up the in-tank setup or running an Aux system is likely necessary.

I think your plan B is the best bet if you're on a strict budget. Would like to see Pistons AND Rods in that plan, though. Rods take quite a beating on PD setups. The OE rods have been proven to be soft, some shops have taken apart engines that hadn't failed but had rods that were tweaked. Though, probably softened up by detonation, which wouldn't happen if there's enough fuel and good fuel. It wouldn't hurt to have some fresh bearings to punish as well. The LT4 system will support some E and that's going to let you make consistent power as well.

1LE fuel pump? I think u mean LT1 fuel pump.

[m6-lt1]

Originally Posted by 2023TwoSS

1LE fuel pump? I think u mean LT1 fuel pump.

No he meant 1LE. The SS 1LE has the same in tank fuel pump as the LT4.

[Joshinator99]

Originally Posted by Saberscar223

Alot of you have given me really good advice and here are my final options for Engine integrity when adding a Magnesun 2650. My goal is 700-750whp.

Plan A: I add the Magnesun 2650 and too high psi Port Injection and leave internals stock. Since I have a bigger cam as well I'm hoping Id be able to run full E85 on this setup.

Plan B: I add the Magnesun 2650, TSP drop in pistons and the LT4 fueling system and run 93.

Plan C: I just add the Magnesun 2650, keep the boost low and run 93, Ive been told that would be safe with the bigger cam and its also the cheapest option.

Plan A for now but keeping the boost low and the power in the 625-650 WHP range that way your stock bottom end lives. Enjoy the car and continue to save for a real bottom end…then turn it up.

[Megahurtz]

With the stock LT1 pistons, a 2650 is a waste of money. You would be better off doing an LT4 conversion and keeping boost under 9psi and running some sort of ethanol blend.

[GreyGhost702]

Originally Posted by 2023TwoSS

1LE fuel pump? I think u mean LT1 fuel pump.

Originally Posted by m6-lt1

No he meant 1LE. The SS 1LE has the same in tank fuel pump as the LT4.

Exactly. If OP intends to use port injection, the HPFP is more or less irrelevant. The LT1 HPFP is more than enough for driving purposes with any engine/FI combo on any fuel/E blend. The Tank or Aux pumps will be the heavy lifters wherever the DI-PI handoff ends up. But I have no experience with PI/Aux Fueling so maybe there's deeper rules to the base fuel system, but that's how THPSI explained it to me.

I feel for the OP. FI DI cars are money pits. Blowers are expensive. DI fueling is expensive. PI retrofitting is expensive. Compared to any of that, forged internals are cheap! And shit can still go wrong even when you're doing everything right.

The LT4 fuel system is very stout, will support an E blend, and won't break the bank. (~$1600 if he has the LT4 in-tank already) You won't be able to max out a maggie on it, but you pulley right and let it make what it makes safely/consistently. As long as you're doing forged rods & pistons in that build, it's a step in the right direction.

If you're on a mods budget & making a car payment, it's all you're going to think about every time you take the car out. At least forged, you can remember it can withstand an "oops" or two, and it's now built for FI.

Alternatively, sell the SS and buy a ZL1. In terms of costs to modify, you're starting with a better base and a ton of power potential without the need to dig into engine internals to get there, and a fuel system to support most of it. It's also an immediate upgrade over an SS. In terms of car note, clearly the ZL1 is a hefty price tag. But there are a slew of them out there in the $40-50k range and varying milage but under 60k/mi. If the average SS payment was $500/mo, assuming positive equity + cash, a ZL1 would land about $200-$250/mo more.

[KingLT1]

The 2650 is really overkill until you get north of 800-850whp. Yes it does have superior cooling, but for a 700-750whp power goal, I would find a used ported LT4 blower(put a 2.7 upper with 7" lower), LT4 fuel system and run a E60 blend. You will need a JMS booster for the low side pump. Your stock bottom end with that BTR 225 cam will be fine around 700-750 on E50-60. Jenetty has done a ton of those builds with his own cam. Or put a P1x or ECS setup on it.