WANTED Exhaust Manifolds
- Thread starter 88_AHB
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Are you looking for police or non-police exhaust manifolds (which are different)?
The casting numbers for '80-89 (non-police) manifolds are:
4173140 or 4173143 for Right side.
For Left side is 4095244 (with oxygen sensor hole).
I don't have any – but eBay or a local salvage yard might be of help.
BudW
The casting numbers for '80-89 (non-police) manifolds are:
4173140 or 4173143 for Right side.
For Left side is 4095244 (with oxygen sensor hole).
I don't have any – but eBay or a local salvage yard might be of help.
BudW
88_AHB
Well-Known Member
Doesn't have to be police issued manifolds,I didn't know there was a difference but I shouldn't be surprised lol. Is there a physical difference other than the casting number and the oxygen sensor?
brotherGood
Well-Known Member
Just took mine off for headers. Whatever that spring thing is on the passenger side (I just cant remember its name or function) doesnt work..it just spins freely.
Shoot. If you were close enough I'd throw in the entire dual exhaust system I took off. Just need to repair one section of pipe.
Shoot. If you were close enough I'd throw in the entire dual exhaust system I took off. Just need to repair one section of pipe.
The police 318 engines use 360 cylinder heads, intake and exhaust manifolds – which have larger ports than what 318's use.
It doesn't do that much (if anything) to install 360/police 318 exhaust manifolds onto a 318. Mainly the 318 exhaust ports on cylinder head are smaller and will still be the bottleneck. Think of blowing through a soda straw. Now crimp a area (any area). Air flow will be limited by the bottleneck – so without porting or installing 340/360 (or 318 police) heads onto a 318 – the 360/318 police exhaust manifolds wont be of much help.
On the other side of that, putting 318 exhaust manifolds onto a 340/360/318 police engine would be "crimping that straw".
I had a pair of '84 318 police exhaust manifolds - but they got lost when I moved several years back.
BudW
It doesn't do that much (if anything) to install 360/police 318 exhaust manifolds onto a 318. Mainly the 318 exhaust ports on cylinder head are smaller and will still be the bottleneck. Think of blowing through a soda straw. Now crimp a area (any area). Air flow will be limited by the bottleneck – so without porting or installing 340/360 (or 318 police) heads onto a 318 – the 360/318 police exhaust manifolds wont be of much help.
On the other side of that, putting 318 exhaust manifolds onto a 340/360/318 police engine would be "crimping that straw".
I had a pair of '84 318 police exhaust manifolds - but they got lost when I moved several years back.
BudW
88_AHB
Well-Known Member
If you're willing to part with them let me know. Are they off your AHB car?
brotherGood
Well-Known Member
They're the AHB manifolds, I dont have a use for them so I dont mind getting rid of them
BrotherGood, before they leave your possession can you record and send me (or post here) the 7-digit casting numbers off of them, please?
Thank you, BudW
Thank you, BudW
brotherGood
Well-Known Member
Sure thing
brotherGood
Well-Known Member
Many Thanks!
It looks like the Left side casting number is 4173166 ?
Can't tell if last two numbers are a "6" or an "8".
It appears the Left side cast date (not the machining date) is 4/27/85.
The Right side looks like casting number is 4173156 ?
It also looks like you might have the ultra hard to find A.I.R. pipe caps installed (maybe):
BudW
It looks like the Left side casting number is 4173166 ?
Can't tell if last two numbers are a "6" or an "8".
It appears the Left side cast date (not the machining date) is 4/27/85.
The Right side looks like casting number is 4173156 ?
It also looks like you might have the ultra hard to find A.I.R. pipe caps installed (maybe):
BudW
SharkHead
Well-Known Member
Go to car-parts.com and use the search feature-you should get lots of results starting with closest to your zip code
I had a 85 AHB.. In 97-00 and worked at a dealer and found those caps and removed ALL pollution crap..and GM crap carb..
And went with ECU and it was like nite & day difffent.. Might actually caught a criminal now..
And went with ECU and it was like nite & day difffent.. Might actually caught a criminal now..
88_AHB
Well-Known Member
Is it worth getting rid of those caps and welding something in place? Would there be a issue using these not with A.I.R.,since it has a hole below each port would it leak?
The factory caps are by far the easiest method (quick and easy).
As long as you don't live in an emissionsNazi state/community, this method works as well:
I have purchased some materials (steel and header gasket material sheets) to make a bunch of caps – but it is on my long list of “things to do”.
I bought the materials 3+ years ago, and lot looked at it sense.
BudW
As long as you don't live in an emissions
I have purchased some materials (steel and header gasket material sheets) to make a bunch of caps – but it is on my long list of “things to do”.
I bought the materials 3+ years ago, and lot looked at it sense.
BudW
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