[dbs1]

Planning to get started on the blown LT4 in the next few weeks. The shop that scoped it can't be sure, but think replacing the pistons and rods and honing the block may take care of it.

Car last dyno'd at 688 whp with a 9.1 lower, ported tb, rf, 45% ethanol tune, kooks, jam aux booster.

Looking to shoot for 750whp with putting in a 32% cam and porting the factory blower. What else should I be looking at doing besides the upgraded oil pump in hitting that number and living a long and healthy life?

[laynlo15]

Save the money and buy a Maggie 2650 and sell your Lt4. Easy 750 and you still get money back on your 1740 blower. Go for it.

[Joshinator99]

Originally Posted by dbs1

Planning to get started on the blown LT4 in the next few weeks. The shop that scoped it can't be sure, but think replacing the pistons and rods and honing the block may take care of it.

Car last dyno'd at 688 whp with a 9.1 lower, ported tb, rf, 45% ethanol tune, kooks.

Looking to shoot for 750whp with putting in a 32% cam and porting the factory blower. What else should I be looking at doing besides the upgraded oil pump in hitting that number and living a long and healthy life?

When you port the blower and add a cam, definitely upgrade to a 95 or 103mm TB, add RF Big Gulp, and headers.

[dbs1]

NOT doing the Maggie, unless my son wants to go to that expense and go for 850whp and all the other items needed for that.
Already have kooks LT's and planning on a bigger tb and the big gulp.

[Camaro1973]

Originally Posted by dbs1

NOT doing the Maggie, unless my son wants to go to that expense and go for 850whp and all the other items needed for that.
Already have kooks LT's and planning on a bigger tb and the big gulp.

Get the heads done too.

Cam
Heads
103mm nw
RF big gulp
Ported blower
Headers


May need better low side to run more ethanol.

[JBones81]

What are 750rwhp zl1s running 1/4?

[Gunkk]

Originally Posted by JBones81

What are 750rwhp zl1s running 1/4?

I would suspect an otherwise stock ZL1 with a) drivermod, b) trans tune, and c) rear drag pack outrun the 750hp cars which lack a, b, and c. But that's just me.

More useful answer: anywhere from high 8s to low 11s depending on the mods, driver and phase of the moon. Internal mods seem to give up to 0.4 improvement over otherwise unmodified internals.

See also: https://www.camaro6.com/forums/showthread.php?t=427506

[laynlo15]

Probably running really low 10s. My SS with 2300 Maggie made over 750 and ran its best 10.00@139 before I rebuilt the motor and did the 2650 Magge.

[IneedAZ]

Curious to why limiting yourself to a 32% fuel lobe cam? Check out the BTR cams with their 38% lobe. Extra 6% for same price range. Is your car an A10 or M6? Auto go with BTR stage 2, and M6 you could do stage 2 or 3.

[KingLT1]

LPE HPFP, 43% cam, +30 injectors if you plan on continuing to run Ethanol.

[Camaro1973]

Originally Posted by KingLT1

LPE HPFP, 43% cam, +30 injectors if you plan on continuing to run Ethanol.

He should be fine with just the cam and aux low side.

I have just a 32% cam and aux low side and I can run up to E40.

[EDFHOBBIES]

Budget rebuild with 1200 hp capability

Polish Crank $250
Summit rods SUM-LS6125927 $566
Mahle Pistons 930228370 $900 comes with rings
Rebalance Asm and ASM $2400

Ported heads $499.00 https://shop.katechengines.com/produ...er-heads-pair/ (if your only interested in 750 no need to spend the money on Inconel exh valves. Of course this is you doing disassembly and Reassembly mark the valves, buy new seals, spring compressor, and .660 lift spring retainer kit.
.660 spring kit $229 -$450 (BTR or Comp)
CHE 4920 trunnion upgrade $230
Push rods $100
Lifters Johnson, morel, or LS7 on that order (LS7 12499225) $180 to 200
LS trays 12595365 $9 to 11.00
Head Gaskets 12654622 $50 to 60 each
Camshaft GT35 with 7.85 fuel lobe L210287515 $540.00 Camshaft I like the LPE stuff with the 42% lobe and there Big Bore pump or Ryne Cunningham has his stuff that based on same lobe.
Cam phaser lock AMP Gen V lock out BTR cam phaser $50 (not a limiter)
Cam bolt 12681018 $36.00
Timing Chain C7R by Hinson HMI-C7-RCHAIN $150
Water pump Gaskets 12657430 $3 or 4 bucks ea.
LS Crank seal 12585673 $26.00
LT4 Exh gsk 12657093 $6.48 each

Optional:

Big bore pump L710166914 $1800
FIC plus 30 injectors $2200

If you do not do the LPE fuel parts get a cam with 38% and reuse the LT4 fuel parts

[HoodCheck]

Originally Posted by EDFHOBBIES

Budget rebuild with 1200 hp capability

Polish Crank $250
Summit rods SUM-LS6125927 $566
Mahle Pistons 930228370 $900 comes with rings
Rebalance Asm and ASM $2400

Ported heads $499.00 https://shop.katechengines.com/produ...er-heads-pair/ (if your only interested in 750 no need to spend the money on Inconel exh valves. Of course this is you doing disassembly and Reassembly mark the valves, buy new seals, spring compressor, and .660 lift spring retainer kit.
.660 spring kit $229 -$450 (BTR or Comp)
CHE 4920 trunnion upgrade $230
Push rods $100
Lifters Johnson, morel, or LS7 on that order (LS7 12499225) $180 to 200
LS trays 12595365 $9 to 11.00
Head Gaskets 12654622 $50 to 60 each
Camshaft GT35 with 7.85 fuel lobe L210287515 $540.00 Camshaft I like the LPE stuff with the 42% lobe and there Big Bore pump or Ryne Cunningham has his stuff that based on same lobe.
Cam phaser lock AMP Gen V lock out BTR cam phaser $50 (not a limiter)
Cam bolt 12681018 $36.00
Timing Chain C7R by Hinson HMI-C7-RCHAIN $150
Water pump Gaskets 12657430 $3 or 4 bucks ea.
LS Crank seal 12585673 $26.00
LT4 Exh gsk 12657093 $6.48 each

Optional:

Big bore pump L710166914 $1800
FIC plus 30 injectors $2200

If you do not do the LPE fuel parts get a cam with 38% and reuse the LT4 fuel parts

The LS7 lifters arent that good...88958689 is the "upgrade" for the LS7 from GM. I didn't realize these would work in a LT4 though (although I also never looked into it).

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

[KingLT1]

Originally Posted by Camaro1973

He should be fine with just the cam and aux low side.

I have just a 32% cam and aux low side and I can run up to E40.

I would advise building the setup to be able to run more then E40. Ideally I would want to get to E60. Nothing wrong with E40 but having to run that low means your fuel system is on edge of running out. I would want more window for error ideally...especially with a higher power build. Not everybody is on point with logging their car and making sure they are not running out of fuel. You and I are a exception compared to the average enthusiast.