Ian Turgeon
Cascading Inspiration
look at it like 2 colums.. theres only one in the without.
Yeah, I'm pretty sure. The surface where those holes are supposed to be is just the standard sand-cast-iron bumpy surface. No grit or grime that could cover a hole or plug. I checked both heads to be sure. However, I'm swapping valve covers this weekend (wife permitting :roll: ), I'll let you know the casting numbers afterwards.Blake said:
Ok, just heard back from Jim Sloan. He checked the original heads that came off my truck and verified that they were indeed L-35's. I'll take some pics of them and post them on my site the next time I am at his house. So its official, my 93' Ty #2170 came from the factory with L-35's. Wish I had known that before I took them off and replaced them with ported LB4's from Norm's old Syclone. No wonder the Ty got slower and picked up more knock.
Later,
Later,
Ian Turgeon
Cascading Inspiration
dourtyb said:
DOH :banghead:
B
Blake
Guest
I doublechecked both of the L-35s I doing. #10240209 in both of them. Both have the arch at the top of the intake ports. Another thing they have, and you may have to use a dental mirror to see it, is that at the end of the head on the front or rear, there is a small isosolese triangle with the short side on the surface that mates to the block. My LB4 heads have no undulations on the surface of the ends. The LB4s are just a smooth machined surface top to bottom.
Bill, I noticed this, the casting numbers may not help as the same four casting numbers were used on LB4 and L-35 heads between 92 and 93. Just how lazy can GM get?
From Huryde.com
<The '88-'92 TBI engines (LB4 type) have head casting #10144103 which is the older style TBI head that has an intake port that is rectangular in shape with no circular cutout on the top of the port & a highly restricted intake throat compared to the CPI style head .
The '93 TBI engine (also LB4 code) has the same four possible casting nos. available as the '92-'93 CPI engines that all have an 8 degree top angle cut in the ports with the top of the ports having a small circular cutout just like the CPI heads, but they have press-in rocker studs rather than screw-in rocker studs.
The use of these CPI style heads on the '93 up TBI engines is why the HP rating of this engine was raised from 160 HP to 165 HP.
The '92 TBI head is not the same as the '92 CPI head as detailed above, and there may be a few early '93 model TBI engines that were carries over from the '92 model year that still have the old style '92 back TBI heads as well. >
These would look like a LB4 externally, but come with press in studs, the arch at the top of the intake runners would also be there as the L-35s have. Don't know about the intake runner layout though could be open or restricted. That would be the only problem I see. Ask the guys that found them for you and see what they have to say. Do you remember if they had press in studs?
I'm just updating the previous post as far as when people check their trucks and give feedback. The extra hole is an obvious giveaway. If you have this, you will for certain have L-35s.
Blake
Bill, I noticed this, the casting numbers may not help as the same four casting numbers were used on LB4 and L-35 heads between 92 and 93. Just how lazy can GM get?
From Huryde.com
<The '88-'92 TBI engines (LB4 type) have head casting #10144103 which is the older style TBI head that has an intake port that is rectangular in shape with no circular cutout on the top of the port & a highly restricted intake throat compared to the CPI style head .
The '93 TBI engine (also LB4 code) has the same four possible casting nos. available as the '92-'93 CPI engines that all have an 8 degree top angle cut in the ports with the top of the ports having a small circular cutout just like the CPI heads, but they have press-in rocker studs rather than screw-in rocker studs.
The use of these CPI style heads on the '93 up TBI engines is why the HP rating of this engine was raised from 160 HP to 165 HP.
The '92 TBI head is not the same as the '92 CPI head as detailed above, and there may be a few early '93 model TBI engines that were carries over from the '92 model year that still have the old style '92 back TBI heads as well. >
These would look like a LB4 externally, but come with press in studs, the arch at the top of the intake runners would also be there as the L-35s have. Don't know about the intake runner layout though could be open or restricted. That would be the only problem I see. Ask the guys that found them for you and see what they have to say. Do you remember if they had press in studs?
I'm just updating the previous post as far as when people check their trucks and give feedback. The extra hole is an obvious giveaway. If you have this, you will for certain have L-35s.
Blake
B
Blake
Guest
Man Brian, that sucks. I wish this topic would've come up a few years ago. Would've save you some headache :-?
Blake
Blake
AH, no matter. Its got 96' Vortec heads on it now. The engine is running great, too bad there seems to be a problem with the trans now. It is SOP for the syty kingdom. Fix one thing, something else unrelated breaks. HA HA. Once again, Ty #2170 is holding the concrete down in my garage. It does do a good job though. :banghead: <-- Does a good job so describing it. Thanks Ian!
SYO237
SyTy Registry
me and ian took the ty out the other night for some prelim tuneup diacom runs..
saw the most of 5 degrees of knock even with o2, tps and esc codes all over the place...half ass ignition tuneup only.....no IC pump, stock IC lines, MATs running at almost 200 degrees....
this was running on both the JET chip the truck came with, and a custom mild 2bar chipped by BG
could this be a reason for GM giving the 5hp diffrence rating between years?
(280-285)
saw the most of 5 degrees of knock even with o2, tps and esc codes all over the place...half ass ignition tuneup only.....no IC pump, stock IC lines, MATs running at almost 200 degrees....
this was running on both the JET chip the truck came with, and a custom mild 2bar chipped by BG
could this be a reason for GM giving the 5hp diffrence rating between years?
(280-285)
Ian Turgeon
Cascading Inspiration
actually a keith hack bbzb.SYO237 said:
does seem like theres a small leg up for the later 93's
lets narrow down where these started if possible.
Ian Turgeon
Cascading Inspiration
/0634 Phil Chivers Dallas, TX White / White mailto
hilntx@aol.com
/0704 Buddy Owens Port Orange, FL Black / Black mailto:btyphoon93@aol.com
/0750 Ryan Le Vier Fayetteville, NC White / Grey mailto:SigoNow@aol.com
/0761 Judy Edwards Prattsville, AR Black / Grey mailto:hscmed@ipa.net
/0823 Dan Wolkomir Grand Forks, ND Black / Black mailto:wolkomir@badlands.nodak.edu
/0922 Fenix Black / Black mailto:fenix@wintek.com
/0943 David Payne Mobile, AL Black / Black mailto:skintbak@aol.com
/1094 Michael Pearce Audubon, NJ Black / Black 13.29 @ 98.3 mailto:NJTyphoon@aol.com
/1045 Mr. Sumption CONFIDENTIAL Red / Gray
theres a listing of sportmachines.
hilntx@aol.com/0704 Buddy Owens Port Orange, FL Black / Black mailto:btyphoon93@aol.com
/0750 Ryan Le Vier Fayetteville, NC White / Grey mailto:SigoNow@aol.com
/0761 Judy Edwards Prattsville, AR Black / Grey mailto:hscmed@ipa.net
/0823 Dan Wolkomir Grand Forks, ND Black / Black mailto:wolkomir@badlands.nodak.edu
/0922 Fenix Black / Black mailto:fenix@wintek.com
/0943 David Payne Mobile, AL Black / Black mailto:skintbak@aol.com
/1094 Michael Pearce Audubon, NJ Black / Black 13.29 @ 98.3 mailto:NJTyphoon@aol.com
/1045 Mr. Sumption CONFIDENTIAL Red / Gray
theres a listing of sportmachines.
B
Blake
Guest
I tried emailing some of these people and the emails were out of date or they didn't own them anymore
The change happened somewhere between #650 and #1011.
This would be real nice to see where it happened. I'm pulling my eprom out of the Ty tonight to see if any changes were done to its bin. Compared to some of the others I have on file(a LOT).
Blake
The change happened somewhere between #650 and #1011.
This would be real nice to see where it happened. I'm pulling my eprom out of the Ty tonight to see if any changes were done to its bin. Compared to some of the others I have on file(a LOT).
Blake
TurboManiacal
Donating Member
SyTyArchives said:/0634 Phil Chivers Dallas, TX White / White mailto
/0704 Buddy Owens Port Orange, FL Black / Black mailto:btyphoon93@aol.com
/0750 Ryan Le Vier Fayetteville, NC White / Grey mailto:SigoNow@aol.com
/0761 Judy Edwards Prattsville, AR Black / Grey mailto:hscmed@ipa.net
/0823 Dan Wolkomir Grand Forks, ND Black / Black mailto:wolkomir@badlands.nodak.edu
/0922 Fenix Black / Black mailto:fenix@wintek.com
/0943 David Payne Mobile, AL Black / Black mailto:skintbak@aol.com
/1094 Michael Pearce Audubon, NJ Black / Black 13.29 @ 98.3 mailto:NJTyphoon@aol.com
/1045 Mr. Sumption CONFIDENTIAL Red / Gray
theres a listing of sportmachines.
Imagine my surprise to see that I'd be in the mix in this...somehow. I used to Own Ty#0750 but it went to E-Rue...then E sold it to a guy by the name of Marshall that is the current owner. Marshall is a buddy of Myclone so it wouldn't be a stretch to get them to check on the heads. I used to know the owner of Ty 0749 but he sold it to a dealership in Cali about a year and a half ago. Soon enough though...I imagine I'll get the opportunity to check on the POS replacement engine in Sy0464.
Okay, I pulled a valve cover last night, and got the casting number off my "mystery" L35 head. The number is 14099064. There is also a "F122" cast in the head, right above the casting number. Based on everything I've read, these really are L35 heads, but they don't have the knock sensor holes (which is how other people have been identifying these heads).
Any idea what's going on with these "stealth" L35s?
Any idea what's going on with these "stealth" L35s?
B
Blake
Guest
Can you guys see if the marine motor heads have the small triangle relief cast into the ends of the head? Probably need a small dental mirror and a flashlight to see. If so, this will be the only other way to check someone's engine for "stock" status at a competition without taking it apart. I'll try to get a pic of what I'm talking about.
Blake
Blake
Jim got some pics of my stock heads. I put them up on the web at:
http://www.got-boost.net/history/images/ty2170_l-35_1.jpg
http://www.got-boost.net/history/images/ty2170_l-35_2.jpg
http://www.got-boost.net/history/images/ty2170_l-35_3.jpg
I'm trying to get him to take a pic of the rocker arm stud for me as well.
Enjoy.
http://www.got-boost.net/history/images/ty2170_l-35_1.jpg
http://www.got-boost.net/history/images/ty2170_l-35_2.jpg
http://www.got-boost.net/history/images/ty2170_l-35_3.jpg
I'm trying to get him to take a pic of the rocker arm stud for me as well.
Enjoy.