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My 5.7 L (350 cu in) L98 V8 came out of a 1989 Corvette that was wrecked. As per the owner, this engine originally came with a TPI system, but because of the lack of funds, the intake manifold was changed and a Carburetor installed. This engine has 4 bolt mains. I eventually converted it back to EFI.
I rebuilt my engine with parts from Summit because of the ring issue LT1 mentioned in his post. I had purchased a set from my favorite auto parts store but the the top ring groove had a step and the second ring groove had a bevel. The set I got from the auto parts store had bevels on both the first and second ring
So for sure, there are different rings for each application. Year make and model is not enough.
The tech at Summit told me there were different ring applications and had me clean up the piston to get the number. based on that they were able to provide me with the correct parts for my engine application. The ring groove cleaner I borrowed had three cleaning blades. One for the first ring groove( which had the step), one for the second groove( which had the bevel) and one for the oil ring groove( which was wider), with stamped "THIS SIDE UP" on the blades. Buyer beware. Not because someone says that the engine is from a particular vehicle, that may not necessarily be the case. That engine may well be an L82. Who knows.
It's not a high performance motor, it is a stock 94 lt1 out of a Pontiac firebird. Only thing that had been done that I can tell was the cam, . It wasn't in the firebird when I bought it, it was in an early 70s monte carlo.
All pistons are currently back out as I have new ones coming,.
Isc, in the lump post over in off topic you state the oil filter adapter is not correct, is this just a fitment thing for exhaust clearance? Or is there.some.other reason its incorrect? Engine had stock manifolds and no clearance issues, maybe used because of monte carlo ????
Regardless of which engine you have, with a proper rebuild it will be bullet proof. Do it right the first time and you will enjoy it for years to come.
My comment above does not count for anything since your engine is a 1994 model LT1.
The LT1 in my car came from a 94 Cadillac Fleetwood brougham. iron heads version.
It has that oil filter adapter. If you look carefully, you might find that it has plugged holes.
Some applications of this engine used an oil cooler. That is the purpose of the "adapter'.
Is your Fire Bird sourced iron headed or alloy???
Is the Lt4 cam a Camaro/Fire Bird item?
My "lump" is laid up. Diagnosis: corroded and loose fitting Coil to Opti wire. Replacement via son OTW!!!
Tis an oddity as to any other HT wire!!!! Odd "female" on both ends...
Carl
The LT1 in my car came from a 94 Cadillac Fleetwood brougham. iron heads version.
It has that oil filter adapter. If you look carefully, you might find that it has plugged holes.
Some applications of this engine used an oil cooler. That is the purpose of the "adapter'.
Is your Fire Bird sourced iron headed or alloy???
Is the Lt4 cam a Camaro/Fire Bird item?
My "lump" is laid up. Diagnosis: corroded and loose fitting Coil to Opti wire. Replacement via son OTW!!!
Tis an oddity as to any other HT wire!!!! Odd "female" on both ends...
Carl
Theres no take off for an oil cooler, its aluminum heads, the cam is designed for lt4 corvette motor, but is a drop in for lt1 as long as you swap springs but mine still has the 1.5 stock rockers, so I am unsure if springs were really changed, I have bought new lt4 springs as I will be adding the 1.6 roller rockers ( not right away, but down the line, and may as well have machine shop do the springs while there, instead of me trying to do it later with heads in situ.)
Absolutely nothing worth updating about, engine is complete, transmission is not even touched yet, but garage is over 100 degrees, window ac unit can bring it down to about 85, still too hot... nothing going to be happening until it cools down. Off to UK on Friday to visit family and spend a few days in Spain too... so, will post on this topic again in maybe October... lol
Last edited by Darrenmb; Jul 17, 2019 at 02:48 PM.
I have done 1 carburetted and 3 LT1-s. If you do it right , its bulletproof and a pistol to drive, I did a 1996 Camaro 6 speed conversion last round. It looked factory.
I just bought a 1995 XJS coup this time. Im going to go at least ls-2 this time. The LT-1 is just long in the tooth albeit a cheaper install to do.
Never could get the GM cruise to work properly though.
Just checking back in and been following this thread as it goes.
Although not an XJ6, I thought you might want to have a look at our (nearly) completed 88 XJSC with 2002 Camaro LS1 and 6speed manual trans. The car is up and running and even with a basically stock LS1 (325hp) and the 3.54 gears (from late XJS rear end with OB brakes) the car is a rocket. Great shifter action, factory level clutch pedal effort, etc. I can only imagine what it would be like with a few LS modes like cam, porting, tuning, etc.,. getting up and over the 400 hp mark. In the pic below the only thing left to do is the AC hookup...That air intake BTW is a California legal high flow setup from K&N - brings in nice cool air from in front of the AC condenser....
Part of the big bump in performance of the car in general is the weight loss using the LS. I had it over at the smog shop where they have a scale and it came in at 3315 lbs with a 1/4 tank of gas and a 180 lb driver inside. That's approximately 400 lbs lighter than a stock V12 automatic XJS. I would expect a 150 lb or so weight savings using an LS in an XJ6...
While we have worked with several hundred customers on LS-Jag conversions over the years, this is actually our first in house manual-trans XJS conversion. I am really happy with the results... And all of this info goes back into the brain trust to be available for customers interested in doing the same thing on their cars.
One note- the engine will get some nice top covers to hide the wiring, fuel rails, etc.,. so the final look will be even cleaner than here.
For anyone interested, the whole buildup is here (Jaguar Specialties) and I am adding new installments periodically-
(since the XJ6 and XJS are so similar, nearly everything shown in that buildup would also apply to an XJ6 S1-2-3)
I have done 1 carburetted and 3 LT1-s. If you do it right , its bulletproof and a pistol to drive, I did a 1996 Camaro 6 speed conversion last round. It looked factory.
I just bought a 1995 XJS coup this time. Im going to go at least ls-2 this time. The LT-1 is just long in the tooth albeit a cheaper install to do.
Never could get the GM cruise to work properly though.
Last edited by JaguarSpecialties; Jul 19, 2019 at 12:21 PM.
Andrew, right now Im trying to sort out the interior and get new wheels & tires as cashflow allows. Just installed a homelink rearview with camera this weekend. Carpet ,console cover etc. Im definitely going ls and 6 speed manual . I will contact you when I get closer to this stage.
No real updates on swap progress due to heat, however, motor is totally finished as I am.able to fiddle with that hy wheeling into laundry room which is air conditioned, and I just got my pcm.back from Moe Bailey at Moehorsepower. He retuned it to delete the vats, egr, and evap systems , adjusted the vss circuit for my rear end and tire size, adjusted shift points and line pressures and retuned for the lt4 hotcam and 1.6 rockers.. he was having a sale on mail.order tunes as theres a big lt1 shootout coming up. Got all that done for 100 bucks!
Just recieved all the hardware for the swap from suncoast, I will be doing the swap over the holiday season as I get quite a bit of down time being in construction... so watch this space for updates and I'm sure, questions.....
This is going to take so much longer than anticipated... I got the hood off and the supports out and decided that was enough for the day!! ADD is a bitch... lol
I recall those days... I flipped my hood/bonnet and put it on the top of my car. A double fold wool blanket under it. It became the receptacle of a lot of the kit that I used in my swap. Progress seen as the parts there became ;less and less.. I did have a few in the trunk/boot. Plus two other stacks. One of Cadillac parts that came with my engine package. some I never used!!! And in another stack, jaguar stuff that would not be used... Still have some that as well.
That might be OK for the likes of a mere Ford or Chevy, Carl, but Certainly Not a Jaguar!
They have Standards of dress and grooming which Frown upon appearing in Public not fully clothed.
Go out without a hood?
The very Idea!
(';')
