1989 5.3/t56 swap underway
Thread Starter
Joined: Sep 2007
Posts: 533
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From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
I love that sfc/torque arm setup. I was really excited until I read the part that says "will not fit convertibles" 



I'm hopefully going to be swapping out my cross member for that new double hump one like you have next year and would like to figure out the easiest way to either use my Spohn torque arm, or get something similar to what you have and add a second set of sfc's to the car.
Good job on the car dude




I'm hopefully going to be swapping out my cross member for that new double hump one like you have next year and would like to figure out the easiest way to either use my Spohn torque arm, or get something similar to what you have and add a second set of sfc's to the car.
Good job on the car dude
Thread Starter
Joined: Sep 2007
Posts: 533
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From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
We had a blast man! The best run I had was a 9.0 but i've never raced before. It was really fun and it was a learning experience for me. I ran it about 6 times and couldn't get traction about 3 of those times!(operator error) overall, I got to drive the car there, race it, and drive it home which was exactly what I wanted to accomplish. I knew it wouldn't be a fast car but it did pretty good imo, now time to save for some go fast parts!
Joined: Sep 2005
Posts: 6,258
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From: O'Fallon, MO
Car: 1991 Z28 convertible built 3/1/1990
Engine: Cammed 6.0L LSX
Transmission: T56
Axle/Gears: custom Ford 8.8", 4.10 gears
Re: 1989 5.3/t56 swap underway
Our local track is closing down after this season, and the only run I ever got in with the swap was the one I broke the rear end on...at least you have a track close to you. I'll probably have to drive to the other side of Missouri to get in a race now.
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From: Alabama
Car: 1986 camaro
Engine: ls2
Transmission: FLT stage 6 60e
Axle/Gears: 8.8 with 3.73's
Re: 1989 5.3/t56 swap underway
We had a blast man! The best run I had was a 9.0 but i've never raced before. It was really fun and it was a learning experience for me. I ran it about 6 times and couldn't get traction about 3 of those times!(operator error) overall, I got to drive the car there, race it, and drive it home which was exactly what I wanted to accomplish. I knew it wouldn't be a fast car but it did pretty good imo, now time to save for some go fast parts! 

but ida came out but some other stuff came up. hoping to get mine completely done and run some low 7's on motor and 6's on spray.well that blows! lol the track he went to is about 45 minutes from me. and about 15-20 minutes from him.
Thread Starter
Joined: Sep 2007
Posts: 533
Likes: 0
From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
glad you had fun dude! if i could go back and do it over again on mods id do a eps pat g. camshaft, 2.5 5.3 heads, and a ported fast 90. through a stick should make over 400 at the tires on a little 5.3
but ida came out but some other stuff came up. hoping to get mine completely done and run some low 7's on motor and 6's on spray.
but ida came out but some other stuff came up. hoping to get mine completely done and run some low 7's on motor and 6's on spray.
Last edited by dynodanmanda79; Oct 9, 2010 at 08:48 AM.
Thread Starter
Joined: Sep 2007
Posts: 533
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From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
I was reading over on LS1 tech and I found this article:
http://www.carcraft.com/techarticles...ine/index.html
I've always liked the sound of the comp cams thumper, but I always thought it was an "all bark and no bite" type of cam. Even though these tests were done with a carb, the hp numbers looked pretty good for just a cam. I'm thinking about picking this cam up along will hardened pushrods, ported oil pump, LS2 timing chain, beehive springs, underdrive pulley, heads, and a FAST intake to see if I can at least reach or pass my expectations of 400 rwhp. Then i'll be upgrading to a moser ford 9" with some 3.73 gears.
http://www.carcraft.com/techarticles...ine/index.html
I've always liked the sound of the comp cams thumper, but I always thought it was an "all bark and no bite" type of cam. Even though these tests were done with a carb, the hp numbers looked pretty good for just a cam. I'm thinking about picking this cam up along will hardened pushrods, ported oil pump, LS2 timing chain, beehive springs, underdrive pulley, heads, and a FAST intake to see if I can at least reach or pass my expectations of 400 rwhp. Then i'll be upgrading to a moser ford 9" with some 3.73 gears.
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Joined: Dec 2008
Posts: 719
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From: Alabama
Car: 1986 camaro
Engine: ls2
Transmission: FLT stage 6 60e
Axle/Gears: 8.8 with 3.73's
Re: 1989 5.3/t56 swap underway
I was reading over on LS1 tech and I found this article:
http://www.carcraft.com/techarticles...ine/index.html
I've always liked the sound of the comp cams thumper, but I always thought it was an "all bark and no bite" type of cam. Even though these tests were done with a carb, the hp numbers looked pretty good for just a cam. I'm thinking about picking this cam up along will hardened pushrods, ported oil pump, LS2 timing chain, beehive springs, underdrive pulley, heads, and a FAST intake to see if I can at least reach or pass my expectations of 400 rwhp. Then i'll be upgrading to a moser ford 9" with some 3.73 gears.
http://www.carcraft.com/techarticles...ine/index.html
I've always liked the sound of the comp cams thumper, but I always thought it was an "all bark and no bite" type of cam. Even though these tests were done with a carb, the hp numbers looked pretty good for just a cam. I'm thinking about picking this cam up along will hardened pushrods, ported oil pump, LS2 timing chain, beehive springs, underdrive pulley, heads, and a FAST intake to see if I can at least reach or pass my expectations of 400 rwhp. Then i'll be upgrading to a moser ford 9" with some 3.73 gears.
Thread Starter
Joined: Sep 2007
Posts: 533
Likes: 0
From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
I was thinking either a 9" or a 12 bolt, what do you recommend? would a 12 bolt be strong enough? would it be as strong as a 9"? I'll have to look up an 8.8, i'm new to all this rear end stuff lol. Also do you know if that guy with the thumpr in his 5.3 had to get a vacuum reserve canister? i've heard a few stories where the thumpr cam doesn't produce enough vacuum for power brakes being it's on a 109 LSA.
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From: Alabama
Car: 1986 camaro
Engine: ls2
Transmission: FLT stage 6 60e
Axle/Gears: 8.8 with 3.73's
Re: 1989 5.3/t56 swap underway
I was thinking either a 9" or a 12 bolt, what do you recommend? would a 12 bolt be strong enough? would it be as strong as a 9"? I'll have to look up an 8.8, i'm new to all this rear end stuff lol. Also do you know if that guy with the thumpr in his 5.3 had to get a vacuum reserve canister? i've heard a few stories where the thumpr cam doesn't produce enough vacuum for power brakes being it's on a 109 LSA.
Supreme Member

Joined: Jul 2003
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From: any clime or place...
Car: 1987 Camaro SC, 1999 Z28
Engine: GMPP 350HO, LS1
Transmission: Built 700r4/EDGE 3200, T56
Axle/Gears: 3.42 Eaton 7.625, 3.42 Zexel Torsen
Re: 1989 5.3/t56 swap underway
T56=S60
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From: Hou. TX
Car: 86 TA, 91 B4C
Engine: 5.3, 4.8
Transmission: 4L80 4000, T56
Axle/Gears: 4.30 M12, 23.42 10 bolt
Re: 1989 5.3/t56 swap underway
I have a Moser 12 bolt, the stock GM 12 bolts can be strong, but nothing like Moser and Strange. The 12 bolt from either will last forever, LMR has gone 7s in the quarter on a 12 bolt, broke a ring and pinion onve from tire shake, but i have seen 9 inch breake axles from tire shake, nothing you can do about that.
I am in the 450 RWHP area i imagine and after launching my 12 bolt at 5100 and beating it to death, a T56 wont hurt one, especially a mild engine, i will be hitting mine with n2o soon as well and i have no doubt that it will not have an issue.
But whatever you want, 12 bolt, 9 inch or Dana 60, but the 9 inch and Dana are over kill for anything on the street i believe.
I am in the 450 RWHP area i imagine and after launching my 12 bolt at 5100 and beating it to death, a T56 wont hurt one, especially a mild engine, i will be hitting mine with n2o soon as well and i have no doubt that it will not have an issue.
But whatever you want, 12 bolt, 9 inch or Dana 60, but the 9 inch and Dana are over kill for anything on the street i believe.
Thread Starter
Joined: Sep 2007
Posts: 533
Likes: 0
From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
Sweet thanks for the advice guys, This car will be more of a daily driver with an occasional weekend warrior status so I think a 12 bolt will be sufficient enough. I've got a 2008 Chevy Cobalt as my daily driver right now, I bought it brand new with 23 miles on it and 2.5 years later it has 54,000 miles from driving it everyday to work and school so i'm looking to switch it up between the 2 cars from now on.
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Joined: Dec 2008
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From: Alabama
Car: 1986 camaro
Engine: ls2
Transmission: FLT stage 6 60e
Axle/Gears: 8.8 with 3.73's
Re: 1989 5.3/t56 swap underway
Sweet thanks for the advice guys, This car will be more of a daily driver with an occasional weekend warrior status so I think a 12 bolt will be sufficient enough. I've got a 2008 Chevy Cobalt as my daily driver right now, I bought it brand new with 23 miles on it and 2.5 years later it has 54,000 miles from driving it everyday to work and school so i'm looking to switch it up between the 2 cars from now on.
but yeah i believe the 12 bolt will work great! my friend has one in his procharged trans am. only thing he told me tonight was they were bad about leaking from the center chunk?? his doesnt leak but thats just what i was told by him.. Supreme Member
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From: Hou. TX
Car: 86 TA, 91 B4C
Engine: 5.3, 4.8
Transmission: 4L80 4000, T56
Axle/Gears: 4.30 M12, 23.42 10 bolt
Re: 1989 5.3/t56 swap underway
Well, mine is used and i have a cover gasket leak, i think anyway, might be from the trans leaking before i fixed it. Pinion is fine.
Thread Starter
Joined: Sep 2007
Posts: 533
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From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
Ok, took my car to outback steakhouse in Destin Friday night to eat with the family, I was on my way home and my car all of a sudden lost fuel pressure, and of all places it happens on the mid-bay bridge. Talk about being scared shitless when all the cars are passing by about 6 inches from my car
, so my dad had to tow me home with his truck. Got looking at it last night and this morning, relay is good and i've got power going through, fuse is good, and I can hear the fuel pump run but no fuel pressure showing on my fuel pressure regulator
, and I also made sure there is gas in the tank. So now I've gotta take the tank down and see what's going on, I have a feeling that either the strainer fell off or my pump took a dump for some reason, Jegs says I have 3 years to return the pump if it is defective.
, so my dad had to tow me home with his truck. Got looking at it last night and this morning, relay is good and i've got power going through, fuse is good, and I can hear the fuel pump run but no fuel pressure showing on my fuel pressure regulator
, and I also made sure there is gas in the tank. So now I've gotta take the tank down and see what's going on, I have a feeling that either the strainer fell off or my pump took a dump for some reason, Jegs says I have 3 years to return the pump if it is defective. Supreme Member
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From: Hou. TX
Car: 86 TA, 91 B4C
Engine: 5.3, 4.8
Transmission: 4L80 4000, T56
Axle/Gears: 4.30 M12, 23.42 10 bolt
Re: 1989 5.3/t56 swap underway
It is also possible that the rubber hose that connects the pump to the fuel line fell off.
Thread Starter
Joined: Sep 2007
Posts: 533
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From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
Senior Member
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Posts: 655
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From: NH
Car: 1967 Firebird P.T.
Engine: LS3 4" Strkr 422ci
Transmission: MN12 6 speed
Axle/Gears: 3.73 8.5" 10 Bolt Eaton
Re: 1989 5.3/t56 swap underway
Hey Dan is there a difference between vette and f-body water pumps? i looked up one for each on autozones website as a reference and they come up with the same part #?? just wanted to confirm. thanks man
Thread Starter
Joined: Sep 2007
Posts: 533
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From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
I'm pretty sure the water pump is the same for both accessory drives, and the brackets are the only real difference. IIRC, the vette accessories sit further back than the camaro accessories but you can still use the same water pump for both.
Thread Starter
Joined: Sep 2007
Posts: 533
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From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
Pulled the tank down today and found out that the fuel pump is good, the 2" piece of rubber hose that connects between the fuel pump and the hard line pick-up tube had turned to jello and came off the pump. Don't know what caused that piece of hose to go bad but popped a new one in and it runs great now. Amazing how a 2" piece of rubber hose can leave you stranded.
Re: 1989 5.3/t56 swap underway
Sounds like submersible hose wasnt used, just plain EFI hose
Gasoline eats rubber like no other, just turns to goo. Standard EFI hose is rated for the pressure and has a coating on the inside of the line to protect it from the chems in the fuel. When you have an intank pump, the hose gets submerged so fuel gets on the outside where there is no teflon coating. Submersible is rated for the EFI pressure and coated inside and out with teflon to prevent breakdown. Be careful when using braided SS hose too like An6. It is simply sleeved in the steel on the outside then standard EFI hose on the inside. It will do the same if submerged
On the outside of the hose look for SAE rating 30R10. That means double coating and rated for EFI pressure. You should be able to get it at any parts store
http://www.gates.com/brochure.cfm?br...ocation_id=541
Gasoline eats rubber like no other, just turns to goo. Standard EFI hose is rated for the pressure and has a coating on the inside of the line to protect it from the chems in the fuel. When you have an intank pump, the hose gets submerged so fuel gets on the outside where there is no teflon coating. Submersible is rated for the EFI pressure and coated inside and out with teflon to prevent breakdown. Be careful when using braided SS hose too like An6. It is simply sleeved in the steel on the outside then standard EFI hose on the inside. It will do the same if submerged
On the outside of the hose look for SAE rating 30R10. That means double coating and rated for EFI pressure. You should be able to get it at any parts store
http://www.gates.com/brochure.cfm?br...ocation_id=541
Thread Starter
Joined: Sep 2007
Posts: 533
Likes: 0
From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
Sounds like submersible hose wasnt used, just plain EFI hose
Gasoline eats rubber like no other, just turns to goo. Standard EFI hose is rated for the pressure and has a coating on the inside of the line to protect it from the chems in the fuel. When you have an intank pump, the hose gets submerged so fuel gets on the outside where there is no teflon coating. Submersible is rated for the EFI pressure and coated inside and out with teflon to prevent breakdown. Be careful when using braided SS hose too like An6. It is simply sleeved in the steel on the outside then standard EFI hose on the inside. It will do the same if submerged
On the outside of the hose look for SAE rating 30R10. That means double coating and rated for EFI pressure. You should be able to get it at any parts store
http://www.gates.com/brochure.cfm?br...ocation_id=541
Gasoline eats rubber like no other, just turns to goo. Standard EFI hose is rated for the pressure and has a coating on the inside of the line to protect it from the chems in the fuel. When you have an intank pump, the hose gets submerged so fuel gets on the outside where there is no teflon coating. Submersible is rated for the EFI pressure and coated inside and out with teflon to prevent breakdown. Be careful when using braided SS hose too like An6. It is simply sleeved in the steel on the outside then standard EFI hose on the inside. It will do the same if submerged
On the outside of the hose look for SAE rating 30R10. That means double coating and rated for EFI pressure. You should be able to get it at any parts store
http://www.gates.com/brochure.cfm?br...ocation_id=541
I guess it wasn't rated to be submerged in fuel. I'll stop by Autozone and see if they have that fuel hose there and drop the tank again and replace it with that. I wonder if the ethanol in the fuel nowadays is another reason why it got ate up so bad? Last edited by dynodanmanda79; Nov 23, 2010 at 11:20 AM.
Re: 1989 5.3/t56 swap underway
Alcohol does not play well with others
Generally the short length of line that comes with a pump kit will be the right stuff or the seller would constantly get an earful of how often their pumps die
Generally the short length of line that comes with a pump kit will be the right stuff or the seller would constantly get an earful of how often their pumps die
Thread Starter
Joined: Sep 2007
Posts: 533
Likes: 0
From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
I agree but for some reason they must've shoved a piece of regular efi hose in, but i'm going to order a piece of that hose this weekend and throw it in
Senior Member
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From: NH
Car: 1967 Firebird P.T.
Engine: LS3 4" Strkr 422ci
Transmission: MN12 6 speed
Axle/Gears: 3.73 8.5" 10 Bolt Eaton
Re: 1989 5.3/t56 swap underway
Dan if you had to do this again, the swap, same parts/car etc, how long would it take you if you had all the parts ready to go, (*from engine/tran out to new engine/trans in and driving)?
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From: Alabama
Car: 1986 camaro
Engine: ls2
Transmission: FLT stage 6 60e
Axle/Gears: 8.8 with 3.73's
Re: 1989 5.3/t56 swap underway
Working on it straight for 2 weeks would prop. Do it. Thats giving alot of smoke breaks for those who smoke.
Senior Member
iTrader: (8)
Joined: Mar 2008
Posts: 655
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From: NH
Car: 1967 Firebird P.T.
Engine: LS3 4" Strkr 422ci
Transmission: MN12 6 speed
Axle/Gears: 3.73 8.5" 10 Bolt Eaton
Thread Starter
Joined: Sep 2007
Posts: 533
Likes: 0
From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
Agreed, It takes alot of work to do this swap. I'm hoping after the first of the year i'll be able to buy a cam and some other things to throw on the car, right now is just a bad time to be spending money on my car with Christmas coming lol.
Thread Starter
Joined: Sep 2007
Posts: 533
Likes: 0
From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
Update! I finally took my car to Adam's Automotive to get some dyno runs in before I do my cam swap. I finally got my promotion at work so I have a little more money to throw around now, though I am still saving money for my wedding in October. I've already bought my valve springs, I still need to buy a timing chain set, oil pump, cam, and pushrods, hopefully i'll be buying all of these soon. Has anyone had any experience with the LS2 timing chain? Supposedly it's a pretty heavy duty chain but I've heard about some slack in the chain, seems that most people are buying a damper and drilling/tapping the block for the damper if it didn't already come drilled/tapped. Do you guys think the slack in the chain will be ok? or not? If not, what's a good single roller chain to use?
Anyways, here are some pictures of the car on the dynojet machine, my best run was the 3rd and final run, I made 270hp and 311 ft. lbs of torque. It's about 10 hp less than what I was expecting, I wasn't expecting big numbers but i'm still pretty happy with the car.



Here's the links to all 3 dyno runs:
http://www.youtube.com/watch?v=MpcJy...el_video_title
http://www.youtube.com/watch?v=lRDyd...el_video_title
http://www.youtube.com/watch?v=Z5Irh...feature=relmfu
And here's the graph for my best run:
Anyways, here are some pictures of the car on the dynojet machine, my best run was the 3rd and final run, I made 270hp and 311 ft. lbs of torque. It's about 10 hp less than what I was expecting, I wasn't expecting big numbers but i'm still pretty happy with the car.



Here's the links to all 3 dyno runs:
http://www.youtube.com/watch?v=MpcJy...el_video_title
http://www.youtube.com/watch?v=lRDyd...el_video_title
http://www.youtube.com/watch?v=Z5Irh...feature=relmfu
And here's the graph for my best run:
Last edited by dynodanmanda79; Apr 5, 2011 at 07:11 PM.
Senior Member
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Posts: 655
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From: NH
Car: 1967 Firebird P.T.
Engine: LS3 4" Strkr 422ci
Transmission: MN12 6 speed
Axle/Gears: 3.73 8.5" 10 Bolt Eaton
Re: 1989 5.3/t56 swap underway
Nice run Dan, i know your going for 400hp and a cam swap is gonna give you a nice jump in power. i meant to ask you, i never did, did you use an LM7 or an L33 5.3? I'm starting to wonder if i should just throw a cam and springs in mine Before i put it in the car...
Thread Starter
Joined: Sep 2007
Posts: 533
Likes: 0
From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
Nice run Dan, i know your going for 400hp and a cam swap is gonna give you a nice jump in power. i meant to ask you, i never did, did you use an LM7 or an L33 5.3? I'm starting to wonder if i should just throw a cam and springs in mine Before i put it in the car...
Joined: Sep 2005
Posts: 6,258
Likes: 6
From: O'Fallon, MO
Car: 1991 Z28 convertible built 3/1/1990
Engine: Cammed 6.0L LSX
Transmission: T56
Axle/Gears: custom Ford 8.8", 4.10 gears
Re: 1989 5.3/t56 swap underway
It's pretty typical that your first two runs are considerably lower than the 3rd or 4th run. I don't know why, I'm sure someone here can explain it.
My first run was 18rwhp less than my 3rd run, and the torque was 22 less on the first run than the 3rd run. (the runs are not in order on the dyno sheet, the way they are on the sheet is 2nd, 4th, 3rd, 1st in that order lol)
My first run was 18rwhp less than my 3rd run, and the torque was 22 less on the first run than the 3rd run. (the runs are not in order on the dyno sheet, the way they are on the sheet is 2nd, 4th, 3rd, 1st in that order lol)
Thread Starter
Joined: Sep 2007
Posts: 533
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From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
Very nice Nick! That's good to hear that i'm not the only one, maybe someone has an explanation to this. I'm hoping to get close to 350 hp and if I get frisky and want more power, i'll just see about swapping in a 6.0 for bigger displacement and power. I'll just throw the 5.3 in the Malibu then!
Thread Starter
Joined: Sep 2007
Posts: 533
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From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
Small Update: Just bought a FAST 90 mm intake from a buddy who had it on his LS2 GTO, bought it for $200 with the dbw throttle body. I have no use for the dbw throttle body so I have a few potential buyers on LS1tech right now. Took the shell off and cleaned it up pretty good on the inside, I still want to repaint the shell, someone who had it before shaved the FAST logo off and painted it black, I might paint it black or go with a dark grey metallic like my LS1 intake is painted. I won't be installing it until I get my cam so I can get the computer tuned for the cam and the new intake at the same time. Hopefully I'll be buying my cam, oil pump, timing set, etc. by the middle of May. Here are some pics:






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Posts: 6,258
Likes: 6
From: O'Fallon, MO
Car: 1991 Z28 convertible built 3/1/1990
Engine: Cammed 6.0L LSX
Transmission: T56
Axle/Gears: custom Ford 8.8", 4.10 gears
Re: 1989 5.3/t56 swap underway
Best deal ever! Wow that's insane! Nice catch!
Junior Member
Joined: Jun 2009
Posts: 57
Likes: 0
From: Carlisle, PA
Car: 91 Camaro RS
Engine: LH6 5.3
Transmission: T56
Axle/Gears: 3.43 LSD
Re: 1989 5.3/t56 swap underway
What if you could bore the 5.3 and get better flowing heads? There is nothing like having the smallest motor and blowing someone elses doors off.
I do believe though that with the cam and better intake you could def. be looking at numbers probably higher than 300hp.
I do believe though that with the cam and better intake you could def. be looking at numbers probably higher than 300hp. Senior Member
iTrader: (8)
Joined: Mar 2008
Posts: 655
Likes: 2
From: NH
Car: 1967 Firebird P.T.
Engine: LS3 4" Strkr 422ci
Transmission: MN12 6 speed
Axle/Gears: 3.73 8.5" 10 Bolt Eaton
Re: 1989 5.3/t56 swap underway
Nice Deal Dan! best deal ive found so far for my swap in comparison to prices is my LS1 F-body oil pan, found one in FL for $25 bucks with the pickup!
Thread Starter
Joined: Sep 2007
Posts: 533
Likes: 0
From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
Yeah $200 was pretty low, it was a friend of mine's intake and he took it off of his GTO and it's been sitting at his parent's house for about a year and he wanted to get rid of it. I told him they usually go for $400-$500 used with no throttle body, so he said "$200 sound good then?" I said ok but you can keep the throttle body and make $100-$150 off of it, well he said screw it and gave me the throttle body with it! This is also an early wedding gift he says! maybe that's why he gave me such a good deal on it!
Thread Starter
Joined: Sep 2007
Posts: 533
Likes: 0
From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
Junior Member
Joined: Jun 2009
Posts: 57
Likes: 0
From: Carlisle, PA
Car: 91 Camaro RS
Engine: LH6 5.3
Transmission: T56
Axle/Gears: 3.43 LSD
Re: 1989 5.3/t56 swap underway
I know today I must have blown a seal... sadly I am thinking head gasket cus I am burning both oil and coolant in large amounts. I wanna stick with the 305 and bore it, a slightly bigger cam and heads but it is out of my price range. So I might be stuck with the simple rebuild and bigger cam for now. I am hoping to get atleast 200hp at the wheels... I might be pushing it though.
Senior Member
iTrader: (8)
Joined: Sep 2010
Posts: 732
Likes: 0
From: Cincinnati, Ohio
Car: '89 GTA
Engine: 5.7L LS1
Transmission: 4L60E
Axle/Gears: 9 bolt 3.27
Re: 1989 5.3/t56 swap underway
Before I put the motor in my car I stuffed an ls2 chain into it with my stock timing gears. There is a little bit of free play in it, but less than my 80k chain. However if I had to do it again I would probably grab a set with gears that was made to fit snugly into an ls1. Hopefully my dyno time will be in the next couple of weeks so I can see if it helps or hurts it.
Re: 1989 5.3/t56 swap underway
Ok, took my car to outback steakhouse in Destin Friday night to eat with the family, I was on my way home and my car all of a sudden lost fuel pressure, and of all places it happens on the mid-bay bridge. Talk about being scared shitless when all the cars are passing by about 6 inches from my car
, so my dad had to tow me home with his truck. Got looking at it last night and this morning, relay is good and i've got power going through, fuse is good, and I can hear the fuel pump run but no fuel pressure showing on my fuel pressure regulator
, and I also made sure there is gas in the tank. So now I've gotta take the tank down and see what's going on, I have a feeling that either the strainer fell off or my pump took a dump for some reason, Jegs says I have 3 years to return the pump if it is defective.
, so my dad had to tow me home with his truck. Got looking at it last night and this morning, relay is good and i've got power going through, fuse is good, and I can hear the fuel pump run but no fuel pressure showing on my fuel pressure regulator
, and I also made sure there is gas in the tank. So now I've gotta take the tank down and see what's going on, I have a feeling that either the strainer fell off or my pump took a dump for some reason, Jegs says I have 3 years to return the pump if it is defective. Thread Starter
Joined: Sep 2007
Posts: 533
Likes: 0
From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Thread Starter
Joined: Sep 2007
Posts: 533
Likes: 0
From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: 1989 5.3/t56 swap underway
Not much to update here, just been doing some small things, finally got my FAST intake sanded smooth and painted, had a guy make me a FAST decal to put back on the intake since the previous owner shaved the emblem off. Still saving money for the wedding in October, can't wait for it to be over then I can go back to buying my goodies! lol




Thread Starter
Joined: Sep 2007
Posts: 533
Likes: 0
From: Crestview, FL.
Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42




