Project "Butt hurt"
Project "Butt hurt" Currently building a kit for a member here, but he would like to remain anonymous. The plan is make hellcat, ZL1 and GT500 scratch their heads and say "I just got drug by a what?"
Goal is 850-900rwhp
Build is as follows:
Stainless turbo kit Keeps a/C (On3 8883 turbo, JGS 60mm gate, 3.5 to 4" DP, 5"IC, 3.5" cold side)
385ci
Block: half fill with hard bloc, splayed billet 4 bolt mains with a main girdle.
Crank: Callies Stealth 3.75"
Rods: 6" Eagle H beam rods with ARP L19 rod bolts.
Pistons: SRP -16cc dished forged pistons tool steel taperwall wrist pins - 10.3:1 scr
Custom Comp Cam 236*/246* @ .050 .600"/.610" 113 LSA cam
Comp R-series lifters
Heads: fully ported LT1 heads (LE3) 295/195 @ .600 lift
AFR hydra rev kit
Fully ported LT1 intake
AS&M Monoblade TB
Kevko Road Race Oilpan
Melling hv/hp oil pump
B&M oil cooler with thermostatically controlled fan
Dual in tank fuel pumps stock fuel lines and adjustable fpr
Injectors 120# high impedence injectors (willing to change to whatever will work)
Trans: Faceplated T56
McLeod street twin clutch
Pro 5.o shifter
Rear: Strange S60 with 35 spline detroit locker 3.54 gears
Goal is 850-900rwhp
Build is as follows:
Stainless turbo kit Keeps a/C (On3 8883 turbo, JGS 60mm gate, 3.5 to 4" DP, 5"IC, 3.5" cold side)
385ci
Block: half fill with hard bloc, splayed billet 4 bolt mains with a main girdle.
Crank: Callies Stealth 3.75"
Rods: 6" Eagle H beam rods with ARP L19 rod bolts.
Pistons: SRP -16cc dished forged pistons tool steel taperwall wrist pins - 10.3:1 scr
Custom Comp Cam 236*/246* @ .050 .600"/.610" 113 LSA cam
Comp R-series lifters
Heads: fully ported LT1 heads (LE3) 295/195 @ .600 lift
AFR hydra rev kit
Fully ported LT1 intake
AS&M Monoblade TB
Kevko Road Race Oilpan
Melling hv/hp oil pump
B&M oil cooler with thermostatically controlled fan
Dual in tank fuel pumps stock fuel lines and adjustable fpr
Injectors 120# high impedence injectors (willing to change to whatever will work)
Trans: Faceplated T56
McLeod street twin clutch
Pro 5.o shifter
Rear: Strange S60 with 35 spline detroit locker 3.54 gears
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Verdad Gallardo Lol, I hope so! I think if when he is in the 700rwhp range at lower boost he will be competitive with the cars mentioned above... if he turns it up and can hook the 850-900rwhp... not a lot of cars able to put that type of power down on the street.
The owner bought the shortblock assembled i believe, so not sure he is gonna change the pistons at this point.
As far as the cam, I did recommend he look at a different cam, and he is willing to swap it out for something more turbo specific. He is in the process of getting feedback from some vendors on here.
Jon
Z-06 Camshaft Spec Hi Jon, sure I understand the Pistons could work fine, measure Crown Thickness ?
That Camshaft, if New, a $400.00 camshaft could be sold.
I made 1250 HP (Westech Benched) on 22 .lbs with a LS-1 400 CID.
The BEST Camshaft was a used Z-06 found on Steve's shelves AFTER ALL the Comp Cam Cams tested, turbo cams, produced LOW power.
I would look for a LT OEM camshaft for this project.
Lance
That Camshaft, if New, a $400.00 camshaft could be sold.
I made 1250 HP (Westech Benched) on 22 .lbs with a LS-1 400 CID.
The BEST Camshaft was a used Z-06 found on Steve's shelves AFTER ALL the Comp Cam Cams tested, turbo cams, produced LOW power.
I would look for a LT OEM camshaft for this project.
Lance
Hi Jon, sure I understand the Pistons could work fine, measure Crown Thickness ?
That Camshaft, if New, a $400.00 camshaft could be sold.
I made 1250 HP (Westech Benched) on 22 .lbs with a LS-1 400 CID.
The BEST Camshaft was a used Z-06 found on Steve's shelves AFTER ALL the Comp Cam Cams tested, turbo cams, produced LOW power.
I would look for a LT OEM camshaft for this project.
Lance
That Camshaft, if New, a $400.00 camshaft could be sold.
I made 1250 HP (Westech Benched) on 22 .lbs with a LS-1 400 CID.
The BEST Camshaft was a used Z-06 found on Steve's shelves AFTER ALL the Comp Cam Cams tested, turbo cams, produced LOW power.
I would look for a LT OEM camshaft for this project.
Lance
Lance, thanks for the info. I'll see if the owner can check crown thickness.One of his goals was to be able to carry power between 6500-6700rpm. Not sure there is a GM LT cam that will allow for it. Considering LT heads don't flow nearly was well as LS heads, he would have to make up for the heads by using a bigger cam than a LS headed engine. Based on your testing, how did the cams stack up relative to each other (reverse split vs traditional vs single pattern)?Jon
Hello guys I'm the owner of the build in question so I will try and answer all questions, first I brought this short block already built and assembled from a member here (thanks Jason) and the crank, rods, pistons and cam were included.
I took it to my local engine builder and had him go thru it and he half filled it with hard blok, installed the main girdle on top of the splayed billet main caps and re align honed the mains. He is also installing deck plugs and re-decking the block he also found that one of the cylinders has a problem that won't cleanup with just a re-hone so we're going to bore it .040 over and install new pistons.
For those asking why 4032 instead of 2618 material for the pistons it's because this is a mostly street car and I don't want to deal with the "cold piston slap" of 2618s. I asked my builder about this and we're also coating "everything" in the engine piston crowns/skirts/underside, rods, crank (counterweights and journals)combustion chambers, valve faces and entire exhaust ports as well as all of the turbo parts. Once coated I don't see a problem with the 4032s.I will also be running the 24x ignition, and meth injection.
For the person asking if the ported stock heads could support this power, here is something from Ai's website
"FI's 9 Second LT1 Street Car! - Forced Inductions has pounded the rollers with 1012 rwhp / 909 rwtq SAE with their PTK 88mm Turbo setup on an ordinary budget Eagle 355 rebuild. This street terror runs our 200 cc ported GM LT1 castings, a 218/218 .544/.544 cam, 12 bolt rear end, and a D&D T56 6-speed. This is a full weight street car with a 3680lb raceweight! With Jose @ FI's experience its run a best of 122mph in the 1/8th and 9.871 @ 156.74 mph in the quarter! The fastest LT1 powered LT1 F-body ever! Click here for a timeslip of this record setting pass!"
However I also have a set of cnc ported AFR 210s and a Victor EFI intake with a Nitrous Outlet LT1 boost elbow and a Monoblade tb that we are going to use since new pistons have to be brought now anyway.
As for the cam my engine builder is going to flow the heads and spec out a billet hyd roller turbo cam for me.
End result however much rwhp/rwtq it makes it makes but I won't be chased home or afraid to come out and play with all the big dogs, LOL and I am very much a person who is willing to listen and take some of the advice of those that have already done it so I am by no means a know it all a$$.
So any suggestions or ideas are always welcome, thanks guys!
I took it to my local engine builder and had him go thru it and he half filled it with hard blok, installed the main girdle on top of the splayed billet main caps and re align honed the mains. He is also installing deck plugs and re-decking the block he also found that one of the cylinders has a problem that won't cleanup with just a re-hone so we're going to bore it .040 over and install new pistons.
For those asking why 4032 instead of 2618 material for the pistons it's because this is a mostly street car and I don't want to deal with the "cold piston slap" of 2618s. I asked my builder about this and we're also coating "everything" in the engine piston crowns/skirts/underside, rods, crank (counterweights and journals)combustion chambers, valve faces and entire exhaust ports as well as all of the turbo parts. Once coated I don't see a problem with the 4032s.I will also be running the 24x ignition, and meth injection.
For the person asking if the ported stock heads could support this power, here is something from Ai's website
"FI's 9 Second LT1 Street Car! - Forced Inductions has pounded the rollers with 1012 rwhp / 909 rwtq SAE with their PTK 88mm Turbo setup on an ordinary budget Eagle 355 rebuild. This street terror runs our 200 cc ported GM LT1 castings, a 218/218 .544/.544 cam, 12 bolt rear end, and a D&D T56 6-speed. This is a full weight street car with a 3680lb raceweight! With Jose @ FI's experience its run a best of 122mph in the 1/8th and 9.871 @ 156.74 mph in the quarter! The fastest LT1 powered LT1 F-body ever! Click here for a timeslip of this record setting pass!"
However I also have a set of cnc ported AFR 210s and a Victor EFI intake with a Nitrous Outlet LT1 boost elbow and a Monoblade tb that we are going to use since new pistons have to be brought now anyway.
As for the cam my engine builder is going to flow the heads and spec out a billet hyd roller turbo cam for me.
End result however much rwhp/rwtq it makes it makes but I won't be chased home or afraid to come out and play with all the big dogs, LOL and I am very much a person who is willing to listen and take some of the advice of those that have already done it so I am by no means a know it all a$$.
So any suggestions or ideas are always welcome, thanks guys!
Last edited by 97Z28SS; Jan 4, 2018 at 12:56 PM.
Just for comparison, mine, 388 Cu in, factory LT4 heads/intake, 11lbs of boost, so far 710 rwhp with a turbo, made a best of 722 rwhp supercharged with app 14lbs of boost, going to keep it at 15lbs and see what she makes, rowing the gears and hitting the rev limiter, so far 10.37 @ 137 mph..
Just for comparison, mine, 388 Cu in, factory LT4 heads/intake, 11lbs of boost, so far 710 rwhp with a turbo, made a best of 722 rwhp supercharged with app 14lbs of boost, going to keep it at 15lbs and see what she makes, rowing the gears and hitting the rev limiter, so far 10.37 @ 137 mph..
The key is a good set of heads/intake.