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I am currently waiting on my heads to get done from being ported and everything else. But there is a problem. The car I got the heads off of was an 89 GTA 350 TPI. I already took them to the machine shop but I am having a feeling that these arent L98 heads. and maybe some previous work was done on the car and they changed heads. does anyone know what these heads are off of. and are they worth the time and money being put into them? with a 220/230 .510/.510 114LSA cam and the egnien combo in my sig. I want to get into the 12's. what do you guys think about these heads?
I know thread is older than dirt, but I'm going to ad info since I searched for this to no avail, here's some info so the next person who searches gets what they are looking for.
14096217 Iron heads, are centerbolt. They are 1987+ (and later) and feature 72 degree center bolts. Valves are 1.94 and 1.5 with 64cc combustion chambers. The head is the same as L98 Iron head 14011083 which is why these heads were found on this car. They came from GM parts, if not a complete crate engine. The engine part number is 12353641. This 350 crate engine came with 285 hp, although I have seen them listed as making 300 hp though thats unlikely unless there was an option.
I know thread is older than dirt, but I'm going to ad info since I searched for this to no avail, here's some info so the next person who searches gets what they are looking for.
14096217 Iron heads, are centerbolt. They are 1987+ (and later) and feature 72 degree center bolts. Valves are 1.94 and 1.5 with 64cc combustion chambers. The head is the same as L98 Iron head 14011083 which is why these heads were found on this car. They came from GM parts, if not a complete crate engine. The engine part number is 12353641. This 350 crate engine came with 285 hp, although I have seen them listed as making 300 hp though thats unlikely unless there was an option.
These heads were also used on Marine 350 engines, including TBI marine engines. Power ratings were up to 320 HP depending on application. GM DID make a 300 HP crate engine with the "217" heads on it. The same engine now comes with "062" vortec heads and makes an extra 30 HP. The 330 HP 350 HO replaced the now discontinued 300 HP 350 HO.
I am currently waiting on my heads to get done from being ported and everything else. But there is a problem. The car I got the heads off of was an 89 GTA 350 TPI. I already took them to the machine shop but I am having a feeling that these arent L98 heads. and maybe some previous work was done on the car and they changed heads. does anyone know what these heads are off of. and are they worth the time and money being put into them? with a 220/230 .510/.510 114LSA cam and the egnien combo in my sig. I want to get into the 12's. what do you guys think about these heads?
So these heads will work with a TPI set-up? because I am right in the middle of polishing and porting these heads. Sure hope so. Block is 10243880
So these heads will work with a TPI set-up? because I am right in the middle of polishing and porting these heads. Sure hope so. Block is 10243880
Yes pretty much the same as 083 or L98 stock 350 TPI iron heads.It will work with a TPI setup that had centerbolt heads. I don't think they will work with say an 85-86 TPI setup which was not centerbolt.
So these heads will work with a TPI set-up? because I am right in the middle of polishing and porting these heads. Sure hope so. Block is 10243880
those heads port out very nice, did a set last year, I blended the bowls, cleaned up the casting marks, gasket matched the ports and after a 3 angle valve job and was very pleased with the flow data
Based on previous information about these 14096217 heads I know they are on my 89 IROC 350 car & thought hmmm, must bet a crate engine but it is NOT, it's a matching # block to my car. I have a feeling these 083 heads were not on ALL 350 cars & some possibly left the factory with the 14096217 heads rather than the 093 heads, bit for good measure I am going to put a set of 083 heads back on my L98
Based on previous information about these 14096217 heads I know they are on my 89 IROC 350 car & thought hmmm, must bet a crate engine but it is NOT, it's a matching # block to my car. I have a feeling these 083 heads were not on ALL 350 cars & some possibly left the factory with the 14096217 heads rather than the 093 heads, bit for good measure I am going to put a set of 083 heads back on my L98
I no this post is old but does anyone around have a set of 217 or also is it the same as I believe the number right 193 I no they're drilled. 72 degrees but I believe the 193 casting number is a swirl port tbi head These are the head numbers i have one set i just got off a tbi motor says it was an 89 with the number 14096193 I'm trying too see if they have the big exhaust stems like the 217 heads do there on my boat so i want the big exhaust stems trust me i been down this road please someone help i just keep buying motors after motor after motor trying hoping I'll get lucky and find a 4 bolt main block
I no this post is old but does anyone around have a set of 217 or also is it the same as I believe the number right 193 I no they're drilled. 72 degrees but I believe the 193 casting number is a swirl port tbi head
These are the head numbers i have one set i just got off a tbi motor says it was an 89 with the number 14096193 I'm trying too see if they have the big exhaust stems like the 217 heads do there on my boat so i want the big exhaust stems trust me i been down this road please someone help i just keep buying motors after motor after motor trying hoping I'll get lucky and find a 4 bolt main block
Based on previous information about these 14096217 heads I know they are on my 89 IROC 350 car & thought hmmm, must bet a crate engine but it is NOT, it's a matching # block to my car. I have a feeling these 083 heads were not on ALL 350 cars & some possibly left the factory with the 14096217 heads rather than the 093 heads, bit for good measure I am going to put a set of 083 heads back on my L98
Do you wanna sell the 217 heads I have 083 heads that just got done in the freaking shop resurfaced and 5 way valve job live in ny
These heads were also used on Marine 350 engines, including TBI marine engines. Power ratings were up to 320 HP depending on application. GM DID make a 300 HP crate engine with the "217" heads on it. The same engine now comes with "062" vortec heads and makes an extra 30 HP. The 330 HP 350 HO replaced the now discontinued 300 HP 350 HO.
Hi Fast355. Do you have any other information about the 350 marine engine you’re talking about I just pulled these heads off of my boat. It was the understanding these were 260 hp engines, so what can you give me to identify the 300 horse or the 320 horse marine engine. been talking to different builders and they are not giving up compression ratios or cam specs, gonna put the Vortech 062s back on I was hoping to get more power than 260 but if I’ve already got 300 or 320 kind of pointless. are you saying that these 217 heads are just as good as the vortec 062s?
To anyone who wants to work with these heads there's a little bit of misinformation out there about them. I myself own a 350 H.O. crate motor with these heads on them, on the crate motor applications at least (may be different with marine idk) they are traditional 90 DEGREE intake bolt pattern, not 72 found on 083 heads. They require a corvette lower TPI manifold or 85-86 unit to properly bolt to the head, Any 55-86 intake manifold can be used. Chevrolet performance parts rated the crate motor with these heads at 300 horsepower
These heads use both intake patterns, on my particular crate motor they are 90 degree, but as fast355 stated below it's both patterns, the only way to tell is by looking at the heads directly, be careful when choosing an intake manifold. For anyone looking for specs on the older style 350 H.O. crate motor these heads came on they're down below in the product bulletin. 350 H.O. specs My 350 H.O. crate engine date coded '95
Last edited by leakyz28; Jan 12, 2024 at 11:27 PM.
Reason: correction
To anyone who wants to work with these heads there's a little bit of misinformation out there about them. I myself own a 350 H.O. crate motor with these heads on them, on the crate motor applications at least (may be different with marine idk) they are traditional 90 DEGREE intake bolt pattern, not 72 found on 083 heads. They require a corvette lower TPI manifold or 85-86 unit to properly bolt to the head, Any 55-86 intake manifold can be used. Chevrolet performance parts rated the crate motor with these heads at 300 horsepower 350 H.O. specs My 350 H.O. crate engine date coded '95
GM machined the same castings with both 90* and 72* bolt angles, causing the difference in information floating around. A good friend and I, David Kauffung once got into a pretty heated debate about it. Was at that point we realized we were both right, GM just offered the same castings with multiple bolt angles. The 217s I owned were on a 72*, the ones David own were on a 90*. My 72* version came off a 300 HP crate engine and it had the cast iron Bowtie Q-Jet manifold on it with the matching bolt angles. I had a TBI tuning customer about 15 years ago that put a 300 hp crate in his TBI truck and bolted the stock TBI intake right on the 217 heads on a 72* bolt angle on that engine. Just because they are on a crate engine does not mean they have a 90* bolt angle. Same goes for the marine versions as well. Some of the marine engines had the 90* angle to match up with the Mercruiser EFI intake that looked like a Ramjet. If you have a 217 head, need to physically look at the center bolts to see if they are 72* or 90*, there is no other way to know for sure which you have.
I can make either intake fit either head very easily and a tappered washer makes the bolt sit properly. No need to go out and buy a different intake when a carbide bit makes quick work out of the minor difference. Some intakes like the one that came with my Weiand 177 were slotted to run with either bolt style. I slotted an early TPI intake to fit the TBI heads on an engine and I slotted a GM TBI intake to put on my old 83 601 heads as well.
GM machined the same castings with both 90* and 72* bolt angles, causing the difference in information floating around. A good friend and I, David Kauffung once got into a pretty heated debate about it. Was at that point we realized we were both right, GM just offered the same castings with multiple bolt angles. The 217s I owned were on a 72*, the ones David own were on a 90*. My 72* version came off a 300 HP crate engine and it had the cast iron Bowtie Q-Jet manifold on it with the matching bolt angles. I had a TBI tuning customer about 15 years ago that put a 300 hp crate in his TBI truck and bolted the stock TBI intake right on the 217 heads on a 72* bolt angle on that engine. Just because they are on a crate engine does not mean they have a 90* bolt angle. Same goes for the marine versions as well. Some of the marine engines had the 90* angle to match up with the Mercruiser EFI intake that looked like a Ramjet. If you have a 217 head, need to physically look at the center bolts to see if they are 72* or 90*, there is no other way to know for sure which you have.
I can make either intake fit either head very easily and a tappered washer makes the bolt sit properly. No need to go out and buy a different intake when a carbide bit makes quick work out of the minor difference. Some intakes like the one that came with my Weiand 177 were slotted to run with either bolt style. I slotted an early TPI intake to fit the TBI heads on an engine and I slotted a GM TBI intake to put on my old 83 601 heads as well.
Very interesting that GM would machine both; I guess it's down to luck of the draw. I lucked out by having the traditional 90 degree pattern since I had a performer intake lying around that was unopened. These cylinder heads seem like with a little bit of work they are good bases to start off of for making good power. Thank you for letting me know, I corrected my post.
Last edited by leakyz28; Jan 12, 2024 at 11:24 PM.
Very interesting that GM would machine both; I guess it's down to luck of the draw. I lucked out by having the traditional 90 degree pattern since I had a performer intake lying around that was unopened. These cylinder heads seem like with a little bit of work they are good bases to start off of for making good power. Thank you for letting me know, I corrected my post.
No problem, just wanted to avoid someone reading this later from thinking all 217s were at 90* angle and having a surprise throw their way. They are a good base, they only flow a little worse than 2.02 fuelies or double humps. Not as well as Vortecs even the Mexican ones but flow well enough to have some fun on the streets.
