273 Comando Head ??

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TerraBella

TerraBella

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Anyone know what the numbers on 273 Comando heads mean? stamped/casted inside by the rockers 2465 315 1 on both heads and also o3265 on one and 03175 on the other.
having some weird head gasket issues on them. this is on my 1965 273 comando Barracuda
any help !!
Thanks in advance!!
 
Hi TerraBella,

2465315 is the correct casting number for all '64 & '65 273 heads. Note that the only difference between the Commando and regular 273 head is the valve springs. Here's what I have for production LA heads trough '86 or so:

LA Small Block Cylinder Head Casting Numbers and Spec's
Through 1986 (From How to Rebuild Your Small-Block MOPAR
by Dob Taylor & Larry Hofer HPBooks 1987):

Engine Year Casting Intake/Exhaust CC
====== ======== ======= =========== ====
273 64-65 2465315 1.78" / 1.50" 57
273 66 2536178 1.78" / 1.50" 57
273/318 67 2658920 1.78" / 1.50" 57
273/318 68-74 2843675 1.78" / 1.50" 60
318 75-83 3769973 1.78" / 1.50" 63
318 77-86 4027163 1.78" / 1.50" 63
318 77-84 4027593 1.78" / 1.50" 63
318 FB 85-86 4323302 1.78" / 1.50" 62.6
318 Police 83-86 4323345 1.88" / 1.60" 75.1
340 68-71 2531894 2.02" / 1.60" 63
340 TA 70 3418915 2.02" / 1.60" 65
340 72 3418915 1.88" / 1.60" 65
340 73 3671587 1.88" / 1.60" 65
360 71-72 3418915 1.88" / 1.60" 65
360 73-74 3671587 1.88" / 1.60" 65
360 75-76 3769974 1.88" / 1.60" 65
360 76 3671587 1.88" / 1.60" 65
360 77-86 4027596 1.88" / 1.60" 65
360 77-86 4021051 1.88" / 1.60" 65
 
and 03=march, 26th and 17th, 5=1965, when the heads were cast. also a 273 has a small bore, so u do not want to use a large gasket like an 8553pt fel pro. find something smaller. and the 3418915 was also on 70-71 2.02" / 1.60" 340
 
Good luck finding a smaller gasket. It's been documented here many times the small gasket is not manufactured by the large vendors anymore. You will either use the larger diameter gasket or pay big bucks to have one custom made by Cometic. Mopar makes a thin gasket which will help to keep your CR up.
 
THANK YOU great info keeps me from runnung in circles!!

CPDave said:
Hi TerraBella,

2465315 is the correct casting number for all '64 & '65 273 heads. Note that the only difference between the Commando and regular 273 head is the valve springs. Here's what I have for production LA heads trough '86 or so:

LA Small Block Cylinder Head Casting Numbers and Spec's
Through 1986 (From How to Rebuild Your Small-Block MOPAR
by Dob Taylor & Larry Hofer HPBooks 1987):

Engine Year Casting Intake/Exhaust CC
====== ======== ======= =========== ====
273 64-65 2465315 1.78" / 1.50" 57
273 66 2536178 1.78" / 1.50" 57
273/318 67 2658920 1.78" / 1.50" 57
273/318 68-74 2843675 1.78" / 1.50" 60
318 75-83 3769973 1.78" / 1.50" 63
318 77-86 4027163 1.78" / 1.50" 63
318 77-84 4027593 1.78" / 1.50" 63
318 FB 85-86 4323302 1.78" / 1.50" 62.6
318 Police 83-86 4323345 1.88" / 1.60" 75.1
340 68-71 2531894 2.02" / 1.60" 63
340 TA 70 3418915 2.02" / 1.60" 65
340 72 3418915 1.88" / 1.60" 65
340 73 3671587 1.88" / 1.60" 65
360 71-72 3418915 1.88" / 1.60" 65
360 73-74 3671587 1.88" / 1.60" 65
360 75-76 3769974 1.88" / 1.60" 65
360 76 3671587 1.88" / 1.60" 65
360 77-86 4027596 1.88" / 1.60" 65
360 77-86 4021051 1.88" / 1.60" 65
Click to expand...
 
VICTOR REINZ 611061500 is about the smallest bore listed for new head gaskets at 4.162 now. Most all others are generic 4.180
 
pishta said:
VICTOR REINZ 611061500 is about the smallest bore listed for new head gaskets at 4.162 now. Most all others are generic 4.180
Click to expand...
Here is a very popular one for 273. It is quite thin compressed.
Fel-Pro Performance Head Gaskets 1008 Mr Gasket 1121G is even thinner and smaller by .040
This is an old thread but worth reviving.
 
Last edited:
That sounds like the Go to gasket for a 273! Too bad they are sold in singles....a few didnt seal but who knows what they were trying to seal: rust, warpage, poor torque. I guess when you go to a graphite coated steel shim gasket, your bound to have a few issues. slather them up with copper coat and cinch em up...pray.
 
clifftt said:
Good luck finding a smaller gasket. It's been documented here many times the small gasket is not manufactured by the large vendors anymore. You will either use the larger diameter gasket or pay big bucks to have one custom made by Cometic. Mopar makes a thin gasket which will help to keep your CR up.
Click to expand...


When it comes to the 273 ...
When ordering custom head gasket bore size...note the chamber are usually a hair bigger than the actuall 3.65 bore possibly because they were already in the works for the 318la predecessor... either way the chambers are already bigger than the bore by a notable amount and a gasket too close to the actual 3.65 bore size could hang into the chamber once installed and act like a step/stair case into the bore.

So measure the chamber width across the valve center, they are closer to 3.8" +inches
 
MOPAROFFICIAL said:
When it comes to the 273 ...
When ordering custom head gasket bore size...note the chamber are usually a hair bigger than the actuall 3.65 bore possibly because they were already in the works for the 318la predecessor... either way the chambers are already bigger than the bore by a notable amount and a gasket too close to the actual 3.65 bore size could hang into the chamber once installed and act like a step/stair case into the bore.

So measure the chamber width across the valve center, they are closer to 3.8" +inches
Click to expand...
Let me see if I can find the photo's I took of the original shim gaskets on a 273 head.
 
This is a 66 #920 head and original steel shim 273 head gaskets.


stock head gasket on 920.jpg
 
Last edited:
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