Lt1 conversion
Thread Starter
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
Originally Posted by C4CBF
Yeah I found the same thing, since I am in no real big hurry I have been collecting the necessary parts for the install. Didn't he say the end of June he would be picking back up?
Instructor
Joined: Apr 2004
Posts: 166
Likes: 4
From: Moneta, VA
Not sure yet, I have less than 100 miles on it so far and it isn't running all that well. Considering I changed just about everything at once I'm going to need some time to sort this out.
If I was to do it again, I would do a LT1 block as well and avoid most of these problems.
I could have kept the A/c but it hasn't worked for years so I figured I could use the room and save some weight.
With the EGR bosses removed the large distributer fits fine.
If I was to do it again, I would do a LT1 block as well and avoid most of these problems.
I could have kept the A/c but it hasn't worked for years so I figured I could use the room and save some weight.
With the EGR bosses removed the large distributer fits fine.
Drifting
Joined: Nov 2005
Posts: 1,361
Likes: 0
From: Downriver Mi.
Originally Posted by gear-head2
Not sure yet, I have less than 100 miles on it so far and it isn't running all that well. Considering I changed just about everything at once I'm going to need some time to sort this out.
If I was to do it again, I would do a LT1 block as well and avoid most of these problems.
I could have kept the A/c but it hasn't worked for years so I figured I could use the room and save some weight.
With the EGR bosses removed the large distributer fits fine.
If I was to do it again, I would do a LT1 block as well and avoid most of these problems.
I could have kept the A/c but it hasn't worked for years so I figured I could use the room and save some weight.
With the EGR bosses removed the large distributer fits fine.
Racer
Joined: Jul 2004
Posts: 389
Likes: 2
From: Howard Beach, NY
I just did the conversion myself. It really wasn't that bad.
I'm using sportsman II heads so I had to have extra material welded to the edges of the intake as well
I did convert to a small distributor, i was able to get the harness from some TPI parts place in maryland, maybe someone can help me out with the name
Bolting the manifold up to the early-style heads was a pain in the *** with the 2 middle bolts! i had to clearance the snot out of the intake with a air grinder
what else... let's see.. the AIR pump bracket had to be ground down a tiny but to make room for the throttle linkage. i used an lt-1 fuel pressure regulator
i managed to get the entire intake set up already converted for like $450 shipped, which included fuel lines and the regulator.
i havent had it running yet, for some reason the stupid thing wont start
here's a picture of it mostly installed:
I'm using sportsman II heads so I had to have extra material welded to the edges of the intake as well
I did convert to a small distributor, i was able to get the harness from some TPI parts place in maryland, maybe someone can help me out with the name
Bolting the manifold up to the early-style heads was a pain in the *** with the 2 middle bolts! i had to clearance the snot out of the intake with a air grinder
what else... let's see.. the AIR pump bracket had to be ground down a tiny but to make room for the throttle linkage. i used an lt-1 fuel pressure regulator
i managed to get the entire intake set up already converted for like $450 shipped, which included fuel lines and the regulator.
i havent had it running yet, for some reason the stupid thing wont start
here's a picture of it mostly installed:
Instructor
Joined: Apr 2004
Posts: 166
Likes: 4
From: Moneta, VA
Originally Posted by MR NICE
Any news on how it's running now?Were you able to run the stock fpr with the HEI ?Did you have to shorten accel cable?if so how?Have you had any leaks or dist. problems? thanks
When I disassembled the intake, I had a few bolts that were loose. I did not use any lock-tight but plan on using it when I reassemble this time.
I was also using a FelPro 1205 gasket which is rubber vs. the stock metal composite. This may have contributed to my failure.
I shortened the throttle cable by making up a replacement end from a 1/4" bolt and then tack welding the end onto the cable.
Dist is working fine.
Hope this helps.
Drifting
Joined: Nov 2005
Posts: 1,361
Likes: 0
From: Downriver Mi.
What about the FPR? I have a fuel rail that connects on the drivers side,can the stock LT1 FPR be used with the hei and the rail I have?The egr boss will be ground.Thanks
Last edited by MR NICE; Jun 22, 2006 at 09:13 AM.
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Melting Slicks
Joined: Aug 2004
Posts: 2,907
Likes: 229
From: Oakbank Manitoba
Originally Posted by MR NICE
What about the FPR? I have a fuel rail that connects on the drivers side,can the stock LT1 FPR be used with the hei and the rail I have?Thanks
Ken
Instructor
Joined: Apr 2004
Posts: 166
Likes: 4
From: Moneta, VA
With my conversion, I am not sure from what car my fuel rail can from but it was a driver side exit. I had to just rotate/flip the supply line to exit the pass side. That puts the schrader valve pointing down and make it unusable to relieve fuel pressure. Then I massaged the mounting bracket for the FPR so the regulator sits straight up instead of angled. This allows the big dist to clear everything.
Instructor
Joined: Apr 2004
Posts: 166
Likes: 4
From: Moneta, VA
Hi,
Everything with the intake is working out ok.
I learned a few more leasons though:
1. definitely need to locktite the intake bolts or they may loosen up
2. need to also have locks on the header bolts or they fall right out
3. LT intakes have dedicated idle passages - need to add an idle bleed hole in the middle of the l98 throttle body so that most of the idle air goes through this passage.
4. The standard l98 airfoil blocks the off too much of this iac air passage, I saw a 50 count change in my IAC valve with and without the air foil.
5. 6000 rpm is really nice on the track, changes the whole character of the car.
But I am still playing with the IAC and the chip. It doesn't idle very good and runs rich.
I have a dyno tune appointment in August to get these sorted out.
Dave
Everything with the intake is working out ok.
I learned a few more leasons though:
1. definitely need to locktite the intake bolts or they may loosen up
2. need to also have locks on the header bolts or they fall right out
3. LT intakes have dedicated idle passages - need to add an idle bleed hole in the middle of the l98 throttle body so that most of the idle air goes through this passage.
4. The standard l98 airfoil blocks the off too much of this iac air passage, I saw a 50 count change in my IAC valve with and without the air foil.
5. 6000 rpm is really nice on the track, changes the whole character of the car.
But I am still playing with the IAC and the chip. It doesn't idle very good and runs rich.
I have a dyno tune appointment in August to get these sorted out.
Dave
Instructor
Joined: Apr 2004
Posts: 166
Likes: 4
From: Moneta, VA
Hi Mr. Nice;
In addition to the LT1 intake, I added to following goodies:
Dart Pro-1 Heads 180cc
Comp Cams 8-466-8 cam
Hooker Headers 2149
Comp Cam Pro Magnum 1.5 rockers
Kennedy DynoTune Chip
ZR1 Oil Cooler
AC Delete
In addition to the LT1 intake, I added to following goodies:
Dart Pro-1 Heads 180cc
Comp Cams 8-466-8 cam
Hooker Headers 2149
Comp Cam Pro Magnum 1.5 rockers
Kennedy DynoTune Chip
ZR1 Oil Cooler
AC Delete
