My Ty's vin with L-35s

B

Blake

Guest
Guys,
Please do NOT trample over this topic with stupidity. It is very interesting that GM would do something like this. Guru Green made a good point about how silly GM would be for setting up certain volumetric efficiencies for LB4 heads and then just slap some L-35s on some of the 93 Ty's.

Here's the last five digits of my Ty's vin...... 11382
No Tooky bashing. At least we know how to identify them sans ripping the engine apart. If anyone compiles this info, can you let me know what you find out?
Thanks
PS:Thanks to the moderators for keeping the chaos/immaturity in check.
If this is in the wrong forum please feel free to move it or let me know how and where and I'll move it.
 
Daron

Daron

Active member
Re: My Ty's vin with L-35s

Lets explore this topic, but lets do it in Tech Talk.
Thanks George,
Daron
 
GAShan

GAShan

Donating Member
My 93 Ty has them too. Checked it out last night. VIN # 1208. Another 93 I checked didn't.
 
Coloty

Coloty

New member
After reading the prior locked thread and seeing the picts of what to look for................you can bet I'll be checking that out TONIGHT. I have 93 Ty #2127 which it sounds like could have L-35s on it. I can also tell you the motor has never been swapped out or even out of her resting place. I'll post the results for sure.
 
Ian Turgeon

Ian Turgeon

Cascading Inspiration
please indicate the last 4 of the vin, what # owner you are, how long you've owned it, and if there is any indication of them being swapped:

L-35s
93 ty #xxxx
3rd owner, for 4 years.
no knowlege of head swap


should help clarify and simplify this.. I'll check adam's new blue/grey tonight.

TookyCat said:
Here are some photographs.

Keep in mind, you can see this the easiest with the hood open using a flashlight and on the driver's side. Find the coolant temperature sensor (blue/green plastic weatherPack connector) between the #3 and #5 plugs, then look about 1" directly above that. If there's no hole, it's a stock SyTy head.

l35heads1.jpg

l35heads2.jpg
Click to expand...
 
2cold

2cold

New member
L-35 heads stock

L-35 heads stock

'93 Typhoon #1904
L-35 heads
owned 8 months
No obvious indication of engine replacement
no knowledge of head swap, all stock
 
Hu Ryde

Hu Ryde

Donating Member
What would be interesting is what kind of studs they have. Also what Casting # they are. Geroge, I have a extra valve cover gasket new, if you want to pull your valve cover I'll bring you the gasket tonight. Let me know. Call me on the cell because I will be out all day long.
 
D

dourtyb

New member
I'm the second owner of my 93' Typhoon #2170. I pulled the original heads off the truck quite some time ago. I'm sure they were the originals as well. I have all the paperwork documenting the maintance that was done to the truck since it was new. It now has 96' Vortec heads on it. My original heads are at Jim Sloan's house at the moment. As soon as he can dig them out he will be giving me the info we need. Casting numbers, stud types, and if they are L-35's or not. I personally don't think they were. I'm pretty sure they had press in studs and didn't have the extra threaded hole the the L-35's do. I'll let you all know what I find out.
 
N

nomoty

Still Boosted
Well my Ty has the hole. I know nothing of the history. But a regular head would be what flat across there? This may have something to do with some of my problems?
 
B

Blake

Guest
My engine is all original. Had a hell of a time tearing it apart from the tranny :evil: I am the second owner. It had 110K on it when I purchased it.
Tranny was correct app also. Owned it about....3 years.
Blake
 
Ian Turgeon

Ian Turgeon

Cascading Inspiration
93 ty 1011
adam Ribakoff
8x,xxx miles, 3rd owner.
l-35s are on there, no indication of any swaps.. the ic pump didnt even work so I dont think someone swapped heads.

this is looking rediculous.. gm :roll:
 
B

Blake

Guest
If the fueling was correct, the L-35 would be nice since they flow a bit more and you don't have to worry about the studs pulling out because they are screw in. I'm curious if the memcal change from the BBZA to the BBZB has anything to do with the head change? Anyone know when the update took place?

It looks like they only changed the
0x0357 KCLOXTH O2 sensor rich/lean threshold voltage from .350volts to .500 volt. Seems this would have richened it slightly.
If I remember correctly, the BBZA with the .350 volt setting would be telling the ecm that the truck was running slightly rich all the time telling the truck to lower the integrator. The BBZB with the .500 volt setting raises the threshold so the integrator doesn't think the truck is running too rich "as often" by average. Is this right or am I looking at it backwards? I based this on the GMP4 doc:
9.1.7.2.1 Oxygen Sensor Rich/Lean Determination -
When the oxygen sensor input voltage is greater than *KCLOXTH*, a rich air fuel ratio is
indicated. Conversely, if the oxygen sensor input voltage is less than or equal to *KCLOXTH*, a
lean air fuel ratio is indicated.
The oxygen sensor rich/lean determination logic is performed once every 25 msec.
Thanks for any help,
Blake
 
GAShan

GAShan

Donating Member
I'm not sure identifying L35 heads as having screw in studs is always correct. I haven't opened up my Ty with L35's, but the ones going on my Syclone (from a 94 full size) have push in studs. The part numbers are 10238181 and the casting numbers are A084 and A064. I think the decoding indicates production dates, these being June and August '94.
 
V6 Kompressor

V6 Kompressor

New member
Just because it doesn't have screw in rocker arm studs, does'nt mean they are not the L35 style heads... L35's came out with pressed in studs until middle to late 94 year model... 1995 was the last model year for the L35....1992 was the first...
 
B

Blake

Guest
Yeah, I just read that on Jesse's site. Seems the full size trucks and TBI trucks tended to have press in...hmmm. Would the little arch on the top of the inlets ports be a better way of identifying them? I mean, if you are at a junk yard that is...this little arch was put up there due to the poppet nozzels that were used on the CPI? Maybe not...

What about the memcal change? One have anything to do with the other?
Thanks,
Blake
 
You must log in or register to reply here.
Top