L35 Casting Numbers
- Thread starter Aeroking
- Start date
gjp
another post whore
Re: L35 Casting Numbers
http://www.syty.net/forums/showthread.php?t=8722&highlight=l35+casting+numbers
http://www.syty.net/forums/showthread.php?t=8722&highlight=l35+casting+numbers
gjp
another post whore
Re: L35 Casting Numbers
from s-10 forum
CYLINDER HEADS
There have been several cylinder heads used on the 262 since it began in '85. Some of the changes appear to be minor, but most of them will create problems if the wrong head is used in the wrong place. Here's an overview year by year:
1985-'86: The 1985 and '86 engines used a 14079248 casting. It had two holes on one end and three on the other end.
1987-'91 truck, except heavy duty and '87-'93 cars: These heads were the same as the earlier ones except that they had three bolt holes on both ends. The intake surface above the ports was quite narrow; it's only about 0.250" wide. The unmachined, cast ledge on the top edge of the head was 0.600" wide. Look for c/n 14094768, 10144103, 14099067 or 12553050. All of these heads had adjustable rockers.
1992 truck with TBI and no balance shaft: These heads had a wider surface for the intake gasket even though they didn't need it because all of the tooling was changed to accommodate the new heads for the VIN "W" CFI engines that were introduced in '92. The 10144103 casting was carried over from '91, but it had the wide intake with straight ports on the top. It can be used along with any of the earlier 14094768, 10144103, 14099067 or 12553050 castings from '87 through '91.
1992-'93 truck with CFI and balance shaft: When the high output VIN "W" engine with central fuel injection was introduced in '92, the heads were redesigned for the application. They had eyebrows added to the top of the intake ports to make room for the injector nozzles, so the intake surface above the ports was increased by 0.250" for improved sealing, and the cast ledge above it was narrowed down to 0.350" to provide more room for the intake manifold.
The 10077626, 14099064, 10240209 or 10238181 castings were used, but be sure to check them over carefully because there are two versions of the 10238181 and 10240209 castings with an important difference. In '92 and '93, they came with an 8° top angle on the intake seat and a 75° throat, but that was changed to a 30° top angle with an 80° throat in '94. Separate the 8° heads from the 30° heads and use them only on the '92 and '93 engines.
Tonawanda switched to "net lash" rockers in '92, so some of these are adjustable and some aren't.
1993 truck with TBI, except heavy duty: The intake manifold on the TBI motor was modified in '93 to take advantage of the wider intake surface that was machined on the '92 and up heads, so these engines must have the heads with the wide intake and should use the castings with the 8° top angle on the intake seat.
1994-'95 truck with TBI or CFI, except heavy duty: The top angle for the intake seat was changed from 8° to 30° and the throat was opened up from 75° to 80° to give a 10% increase in intake airflow for better performance in '94. The same heads were used on both the TBI and CFI engines through '95.
Both the 10238181 and 10240209 castings were used, but they have to be visually sorted because the early ones with the 8° seat probably shouldn't be used on the '94s and '95s. If you do decide to stretch the rules and use the '93 heads on a '94-'95 engine, be sure to use them in pairs.
Some of the '94s still had adjustable rockers because Romulus didn't switch over to "net lash" until '95.
1996-'98 all trucks except heavy duty: There was another all new head introduced in '96. It had bigger intake and exhaust ports, no exhaust crossover and four angled bolts for the intake. It's an 10235772 casting. We believe it is used up through '98.
1989-'95 heavy duty truck with TBI: There have been three different heads used on the heavy duty 262 since '89.
1. 1989-'92: The original head, c/n 14099066 was used up through '91. The 10144115 casting with the wider intake surface showed up in '92 even though the narrow one still worked. Both of these castings are interchangeable.
2. 1993: The 14099070 casting came with an 8° top angle on the intake seat in '93, but it was also available with the 30° top angle in '94 and '95. Sort them accordingly and use them in pairs.
3. 1994-'95: The 14099070 casting with the 30° top angle for better airflow should be used on the '94 and '95 engines. Be sure to use them in pairs.
from s-10 forum
CYLINDER HEADS
There have been several cylinder heads used on the 262 since it began in '85. Some of the changes appear to be minor, but most of them will create problems if the wrong head is used in the wrong place. Here's an overview year by year:
1985-'86: The 1985 and '86 engines used a 14079248 casting. It had two holes on one end and three on the other end.
1987-'91 truck, except heavy duty and '87-'93 cars: These heads were the same as the earlier ones except that they had three bolt holes on both ends. The intake surface above the ports was quite narrow; it's only about 0.250" wide. The unmachined, cast ledge on the top edge of the head was 0.600" wide. Look for c/n 14094768, 10144103, 14099067 or 12553050. All of these heads had adjustable rockers.
1992 truck with TBI and no balance shaft: These heads had a wider surface for the intake gasket even though they didn't need it because all of the tooling was changed to accommodate the new heads for the VIN "W" CFI engines that were introduced in '92. The 10144103 casting was carried over from '91, but it had the wide intake with straight ports on the top. It can be used along with any of the earlier 14094768, 10144103, 14099067 or 12553050 castings from '87 through '91.
1992-'93 truck with CFI and balance shaft: When the high output VIN "W" engine with central fuel injection was introduced in '92, the heads were redesigned for the application. They had eyebrows added to the top of the intake ports to make room for the injector nozzles, so the intake surface above the ports was increased by 0.250" for improved sealing, and the cast ledge above it was narrowed down to 0.350" to provide more room for the intake manifold.
The 10077626, 14099064, 10240209 or 10238181 castings were used, but be sure to check them over carefully because there are two versions of the 10238181 and 10240209 castings with an important difference. In '92 and '93, they came with an 8° top angle on the intake seat and a 75° throat, but that was changed to a 30° top angle with an 80° throat in '94. Separate the 8° heads from the 30° heads and use them only on the '92 and '93 engines.
Tonawanda switched to "net lash" rockers in '92, so some of these are adjustable and some aren't.
1993 truck with TBI, except heavy duty: The intake manifold on the TBI motor was modified in '93 to take advantage of the wider intake surface that was machined on the '92 and up heads, so these engines must have the heads with the wide intake and should use the castings with the 8° top angle on the intake seat.
1994-'95 truck with TBI or CFI, except heavy duty: The top angle for the intake seat was changed from 8° to 30° and the throat was opened up from 75° to 80° to give a 10% increase in intake airflow for better performance in '94. The same heads were used on both the TBI and CFI engines through '95.
Both the 10238181 and 10240209 castings were used, but they have to be visually sorted because the early ones with the 8° seat probably shouldn't be used on the '94s and '95s. If you do decide to stretch the rules and use the '93 heads on a '94-'95 engine, be sure to use them in pairs.
Some of the '94s still had adjustable rockers because Romulus didn't switch over to "net lash" until '95.
1996-'98 all trucks except heavy duty: There was another all new head introduced in '96. It had bigger intake and exhaust ports, no exhaust crossover and four angled bolts for the intake. It's an 10235772 casting. We believe it is used up through '98.
1989-'95 heavy duty truck with TBI: There have been three different heads used on the heavy duty 262 since '89.
1. 1989-'92: The original head, c/n 14099066 was used up through '91. The 10144115 casting with the wider intake surface showed up in '92 even though the narrow one still worked. Both of these castings are interchangeable.
2. 1993: The 14099070 casting came with an 8° top angle on the intake seat in '93, but it was also available with the 30° top angle in '94 and '95. Sort them accordingly and use them in pairs.
3. 1994-'95: The 14099070 casting with the 30° top angle for better airflow should be used on the '94 and '95 engines. Be sure to use them in pairs.
dgoodhue
BuSTeD 4.3
Re: L35 Casting Numbers
http://www.syty.net/forums/member.php?u=3518
He appears to check the forum semi regularly
http://www.syty.net/forums/member.php?u=3518
He appears to check the forum semi regularly
Captain Morgan
Moderated User
Re: L35 Casting Numbers
like i sent you in my PM, Im 95% sure they are LB4 heads.
retract your bid on eBay, they are advertised falsely and go find yourself a REAL set of L35's
like i sent you in my PM, Im 95% sure they are LB4 heads.
retract your bid on eBay, they are advertised falsely and go find yourself a REAL set of L35's
Captain Morgan
Moderated User
Re: L35 Casting Numbers
I just hate for you to get hosed on eBay from someone trying to pass of stock shitty heads as L35's.
maybe he'll want to buy the 4 sets of LB4's i have out in my shop :roll:
no offense taken, I did give myself 5% chance of being incorrect :lol:Aeroking said:
I just hate for you to get hosed on eBay from someone trying to pass of stock shitty heads as L35's.
maybe he'll want to buy the 4 sets of LB4's i have out in my shop :roll: