Which heads?

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66fs said:
67 273 heads flow about the same as late 360 heads, up to .400 to .500 lift about 180 cfm vs about 190 cfm. But they have the small ports so the Performer will work. There is more potential with the 360 heads. But the 66-67 273 heads are not as bad as one would think considering the compression boost. From 73cc to 65cc unmilled, or 64.7cc to 57.3 milled .040" and .038" on the intake side.
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I never seen the smaller heads flow that well.
But there is more to that picture as well.
:lol:
 
I’d stick with the 360 heads hands down. It is a no brainer here.
 
rumblefish360 said:
I never seen the smaller heads flow that well.
But there is more to that picture as well.
Click to expand...

It's kinda weird, early 273's only. Fall flat about .500 and go nowhere or down. I have seen it from more than one source. Those numbers are unported heads. Actually headers might not seal the small exhaust port on the 273 heads, although I have run 340 exhaust manifolds on the early heads. Something to check. Plus 10 cfm is good, not sure what the end result would be on his combination. He has both options available, his decision. Actually, I'd go 273 all the way, big surprise huh?
 
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rumblefish360 said:
... So! Down the block from me (Literally) is a converter shop called Pro Torque that custom re stalled and built up the OE converter. Expensive but worth it. Lots of ceiling room. Perhaps that idea is a workable solution for yourself. A capable & Local shop?
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If you don't mind me asking, how much for them to restall the Torque converter? Have you run it, what are your impressions?
 
So now I’m thinking I’m just gonna order the speed pro H116 pistons have it bored if it needs it and be done. They should get my compression where I want it correct?
 
66fs said:
If you don't mind me asking, how much for them to restall the Torque converter? Have you run it, what are your impressions?
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I’ll have to find the recipe but I think it was around $700. The job I had done wasn’t a simple re-stalling as it is now rated by them to be fine for use up to 650 HP with billet parts. I’d give more info but I’m not remembering it all well right now. It could have been done a lot cheaper of course, but I know the wife and I’m sure it is just a matter of time before I’ll be upgrading that again for more power.

Oh, LOL on the head comment. This is how I see the heads. 273 @ 180 cfm is a higher velocity through a smaller port and valve, the reverse for the 360 head. The difference is tiny and not worth a quibble over. I’d just take the higher volume of air with the larger valve & port and not care a bit about any reduction in velocity at this stage of the game. The higher rpm ceiling and power production would be the win win for me.
BsB Duster said:
So now I’m thinking I’m just gonna order the speed pro H116 pistons have it bored if it needs it and be done. They should get my compression where I want it correct?
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Oh yea! That’s the slug I sent with and installed it at zero deck height. You’ll get about 9.8-1 with open chambered heads & a .039 head gasket this way with a really good quench area. But that’s your call.

I happen to use closed chambered aluminum heads for a just shy of a 11-1 ratio and use pump gas 93.
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Just dropped off the 360 block and crank at the machine shop. It’s a good thing I decided to pull it apart, although it had all new parts in it I found a broken 3/8 drill bit in the oil pan. There was small amounts of metal that chewed up the bearings. I don’t even know how a drill bit gets into the oil pan haha. Machinest is ordering new KB Pistons rings bearings and gasket for me. Also gonna balance rotating assembly. Gonna drop the heads off for springs and good performance valve job whatever that means. I’m running the summit 6901 cam. What kind of power do you think this little engine will make?
 
Afik he gets no quench area with an open chamber head unless he uses the Icon
"
that 6901 is not as small as you might think;
276/288/114 advertised;
218/[email protected]
.441/.441lifts

actually it is the 376/288 is at .004 like a Crane- this grind is an old Cam Dynamics one
so compare it to a low lift 268 comp
but it does not slam the intake closed hard like the comp which is a good thing
I f you own it run it
if you think you need to change advance and then retard 4 degrees and see what your motor really likes
I had a Mopar Crower 218 at .050 cam with .525 lift so that one leaves a lot on the table
but then as I said it is easy on the valve train
almost like a stock 340 cam and about the same vintage duration is actually a little shorter lift about the same
why go higher with stock heads?
 
A good valve job means it should have the area where the valve touches the head made round with a Minimum of 3 angles in order to induce good low lift flow.

Power wise I see an easy 340hp.
 
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rumblefish360 said:
A good valve job means it should have the area where the valve touches the head made round with a Minimum of 3 angles in order to induce good low lift flow.

Power wise I see an easy 340hp.
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Cool if it will make 340 that will be awesome. Should be a fun car. Oh here she is.
 
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Has anyone ran these heads? Seems like a pretty good option considering what it’s gonna cost to rebuild my stock heads, and the price of aftermarket aluminum.
 
BsBDuster they offer LA and magnum. Your 360 is LA so if you get the Indy head be sure to specify LA!:steering:
 
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