273 heads on a (1977) 318 block

[Arend Huisman]

Hi! I just bought a 318 block of 1977. I want to put on my 273 heads (1964) on it. I know we will have to adjust the bolts because of the different angle.
I just wondered if i can use the regular (flat) pistons of the 318 or can i expect to get problems with the valve clearance?

Wishing you a very good new year!

Arend

 

[toolmanmike]

It should be no problem with valve clearance unless you are running a super high lift cam.

 

[Dana67Dart]

I agree with Mike. The 8.9:1 compression were flat topped and the 10.5:1 we're domed with valve reliefs

I don't recall the flat topped ones haveing cuts

 

[NoCar340]

One of my previous cars (1972 Charger Rallye) had 273 heads on its numbers 318 when I bought it. There were no issues of any kind. Even without valve reliefs, the pistons are so far down the hole at TDC (about .080") you'd need a fairly significant cam to crash the valves.

 

[MOPAROFFICIAL]

Hi! I just bought a 318 block of 1977. I want to put on my 273 heads (1964) on it. I know we will have to adjust the bolts because of the different angle.
I just wondered if i can use the regular (flat) pistons of the 318 or can i expect to get problems with the valve clearance?

Wishing you a very good new year!

Arend

It doesn't matter if the heads are closed chamber or open chamber the valves are in the same location and height/distance from the deck. There'll be no problems with the valves interfering with the Pistons the only interference you could have is if you use some crazy pop-up Dome piston that wasn't shaped right for that chamber. The factory high compression Pistons are shaped specifically for that chamber and would not be a problem either.

 

[Arend Huisman]

Thanks for your info, that's good news. I just realized that when i use the original 273 intake manifold, there shouldn't be any problem with the bolting on because of different angles. Am i right?

 

[toolmanmike]

Thanks for your info, that's good news. I just realized that when i use the original 273 intake manifold, there shouldn't be any problem with the bolting on because of different angles. Am i right?

The 64/65 manifolds have smaller bolt holes and at a odd angle compared to the 66and newer. Some member's have hugged out the holes and used some beveled washers to make it work.

 

[MOPAROFFICIAL]

Thanks for your info, that's good news. I just realized that when i use the original 273 intake manifold, there shouldn't be any problem with the bolting on because of different angles. Am i right?

You're opening post you state you are aware of the differnce in bolt angle n size.

 

[RustyRatRod]

Thanks for your info, that's good news. I just realized that when i use the original 273 intake manifold, there shouldn't be any problem with the bolting on because of different angles. Am i right?

I would just find an appropriate later manifold. But that's just me.

 

[Arend Huisman]

You're opening post you state you are aware of the differnce in bolt angle n size.

I thought i was aware of the different bolt angle and in my mind it were the bolts of the heads. Later on i realized that it's about the bolts that are in the intake manifold.
Well, that's what i think now. That would be no problem because i plan to use the 64 intake manifold as well as the 64 heads.

 

[toolmanmike]

I thought i was aware of the different bolt angle and in my mind it were the bolts of the heads. Later on i realized that it's about the bolts that are in the intake manifold.
Well, that's what i think now. That would be no problem because i plan to use the 64 intake manifold as well as the 64 heads.

So a 2 barrel then

 

[Arend Huisman]

So a 2 barrel then

yes, more interested in low torque and economy than high performance