Kecmp
Member
the heads on my 1965, 273 has a casting number of 2465315-2 with hydraulic lifters. Are these the correct heads or are they from a 318 engine?
273 correct heads?
- Thread starter Kecmp
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Those are 64-65 273 heads...
You may want to consider swapping to a 66 and later 273/318 head with the more common intake bolt angle and size... Then you would have a better choice of intake manifolds to upgrade to...
Although hydraulic lifters can be fitted to those heads, they originally came with solid lifters with adjustable rockers
Kecmp
Member
Thanks to all of you. ...the reason why I was questioning if the heads were correct was because they have hydraulic lifters. So is it correct that the 273 came with adjustable rockers originally? Or did some come direct from the factory with hydraulic lifters.
Up through around 67 they came with adjustable rockers. I believe that changed in 68/69 which was the last year for the 273.
Yep!
Wyrmrider
Well-Known Member
so do you have the adjustable rockers and matching pushrods?
do you know if you have a solid or hyd cam?
how can you tell?
pushrods are different solid vs hyd
and
hyd with adj vs non adj (318 style) rockers
do you know if you have a solid or hyd cam?
how can you tell?
pushrods are different solid vs hyd
and
hyd with adj vs non adj (318 style) rockers
Kecmp
Member
I do not have adjustable rockers, and the push rods are hollow. The cam I have no idea. My big concern was if the heads were from a 318. According to Avispa the numbers on the heads are for a 273.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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318LAs didn't come to A-bodies until 1967 and after that, 318heads were the same as 273 heads. So IMO , I wouldn't worry about what they mighta come on. The heads don't care about the valve gear or the lifters.
However the 64/65 273 heads are an orphan with the intake-bolt oddity, no biggie on a lo-performance build, nor on a higher if you already have a matching intake.
On a concours build well then the 315s are correct for 64/65, as the 273 was the only V8 engine available in an A-body.
66 was a kindof transition year.
However the 64/65 273 heads are an orphan with the intake-bolt oddity, no biggie on a lo-performance build, nor on a higher if you already have a matching intake.
On a concours build well then the 315s are correct for 64/65, as the 273 was the only V8 engine available in an A-body.
66 was a kindof transition year.
MOPAROFFICIAL
Oogliboogli
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Oogliboogli
Nah actually... they had casting 920 heads 1967... then they also had a closed chamber 318 truck head with a water heated cross over which you could block and run on any la motor casting 234 heads..being a water cross over..that means blind exhaust ports instead of one on each head having a hole in the bowl.
You can buy a set here..
68-74 Chrysler 5.2L 318ci V8 - Truck - 234 Cylinder Head
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There's the #315 head for 64 and 65. There is also a # 080 head for those years. In 66 there was a #178 (early)
#234 (late) and also the late #920 head which was used late in 66 and into 67. In 68 when 273's went open chamber and hydraulic cam, they shared the #675 head with the new LA 318.
#234 (late) and also the late #920 head which was used late in 66 and into 67. In 68 when 273's went open chamber and hydraulic cam, they shared the #675 head with the new LA 318.
nm9stheham
Well-Known Member
Thanks..! Something new to learn all the time. This one had escaped me. I assume standard 318 ports?
Now I wonder of these were used with the lower compression truck 318 pistons that you can find listed.
The 2658234 heads were also a late 1966 273 head.
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Oogliboogli
Which is why the #234 came on 67 model year 318's in trucks, motorhomes.
MOPAROFFICIAL
Oogliboogli
Truck or industrial only.
Thanks, I'll mark my book.
273-4brl Dart
Member
Can you give me a reply to porting heads/intake?
273-4brl Dart
Member
Can you give me a reply to porting heads/intake?
I have a 69 273. Wanting to do Edelbrock MPI fuel injection. Edelbrock says it will only fit 340/360 heads. Are the intake runners different on the 340/360 than the 273/318? I am contemplating using the 234 head, and having harden seats installed.
"Start a Conversation" with Justin. He is in CA, so he is 3 hours behind us. 273/318 intake ports are smaller than 340/360 heads. Skip the hard seats until you need them.
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Oogliboogli
If the injectors are in the manifold. you'll need to open the 273 intake port windows up to a 360 gasket size and that can be done but cant be blended as deep in the roof area because the casting won't allow it. That's probably what they mean by necessitating the bigger port. Yep, I'm in ca.
On my 73 318 block I have cast iron heads 2843675. These were used on 67 318s and 68-69 273s with 2-bbl carbs. 1.78 intake/1.50 exhaust. Small chambers 62-64cc, small ports. I had Basko Engines in Gilbert AZ open valves to 1.94/1.60, polish bowls, used lightweight valves, 320 springs. They did not port match because of some ports having a bolt hole boss near the opening that would force air to center and reduce flow in those ports. Said the gain wouldn’t be worth what he would charge. The guy has a dozen Wallie trophies in his office for winning races as a driver and a builder so I trust him. I added PRW adjustable 1.5 roller rockers and used .027 Cometic steel gaskets. .030 over, dish pistons, Edelbrock Performer and 600CFM carb, Comp Cams 270H with 224 duration @ .050 lift, .470 lift. 8.75 calculated compression, dyno showed 300 hp 350 tq. Not bad for an old Frankenengine.
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