Slant Six Forum
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Aluminum Head
https://slantsix.org/forum/viewtopic.php?t=17323		 Page 3 of 8
Author:  Tim Keith [ Sun May 14, 2006 12:21 am ]
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I have been reading about the Toyota 2TC/ 3TC pushrod hemispherical motors, I think those are cool little motors. Aftermarket CNC heads are available for these pushrod hemis. This motor can accept larger valves, a crossflow design won't work with a tilted slant six car, but an OEM iron head is fine for my daily drivers.

I believe the 3TC lifter galley is on the passenger side of the block. Wiseco lists 3TC pistons of 3.425 to 3.504", in the range of the Slant Six, but the I think the 3TC pistons are domed, with chamber volume nominally 63 CC. The domed its pistons might be a problem, the pattern for the 3TC is obviously the Mopar hemi. Like the hemi the 3TC responds well to a blower. I believe an overbore of more than .080 is be possible with this Toyota motor, like the slant six it is stout and overbuilt.

A raised port OEM style head might be a good compromise but it probably would require a custom intake manifold, retaining the OEM pattern is definitely the best option for broad appeal, but those who choose the head would probably want to go for custom valve train parts rather than the OEM.
Author:  zedpapa [ Sun May 14, 2006 11:40 pm ]
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it would not require custom manifolds. it would just sit 1/2" to 1" higher, however much the ports are raised. i looked up from underneath my car(while on a lift) and could see plenty of room between the hood and air cleaner.

moving the valve(s) to get maximum size is being considered. hopefully the rockers would be designed around a readily available V8 rocker to try to keep costs down. unfortunately, the valves lean to the same side as the spark plugs, which may cause an issue.

zedpapa
Author:  sandy in BC [ Mon May 15, 2006 7:41 am ]
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Raising the intake even as little as one inch becomes problematic on early A-bodies.
Author:  Tim Keith [ Mon May 15, 2006 9:45 am ]
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I looked at some 3TC in the junkyard this weekend, pretty common. That head would be cool for the basis of a race head. These old Toyotas weren't thin wall castings, they might be stronger than newer import motors. I am only interested in the valves and double rocker arms. I think the intake valves can be almost 2". The head size is more like a 1950s Dodge 270 hemi than a 426, but it definitely looks like a Mopar design. The CH is 1.3" or so, less than a slant six. I don't know what the CH might be with 7 inch rods, maybe there would be aftermarket pistons for this. It was a surprise to see this pushrod double rocker arm head on a Toyota. The head bolt pattern is close to 4", it could be adapted to the slant six block.
Author:  SlantSixDan [ Mon May 15, 2006 3:18 pm ]
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Quote:
Raising the intake even as little as one inch becomes problematic on early A-bodies.
...and very problematic (to the point of being a dealbreaker) on very early A-bodies.

Let's be careful to make sure we don't inadvertently preclude the use of any improved head on the cars most interested people will want them for...!
Author:  AndyZ [ Mon May 15, 2006 5:10 pm ]
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Quote:
Raising the intake even as little as one inch becomes problematic on early A-bodies.
Is this because of hood clearance on 60-62 A-bodies?
Author:  SlantSixDan [ Mon May 15, 2006 5:40 pm ]
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Yep, hood clearance on '60-'62 is almost nil with a stock 225. Clearance to the hood of a '63 Valiant or '63-'64 Dart isn't so wide, either.
Author:  james longhurst [ Mon May 15, 2006 5:49 pm ]
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hood clearance is tight depending on your intake combo. a side draught carb setup would probably have to be used. or a hoodscoop.

-james
Author:  Dart270 [ Mon May 15, 2006 8:06 pm ]
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FWIW, I have fit up to a 3" X14" drop base air cleaner on my 64 Dart with a Clifford or Offy 4V intake and 4bbl carb, and a 4"X14" cleaner on my TBI setup. So, I don't see a problem with a lifted port arrangement with the 63-66 cars.

Anyone buying this head would almost certainly be able to get creative with air cleaners on a 60-62 or 63-66 car. I can't imagine anyone buying one of these heads and running a stock 1bbl and air cleaner.

That said, it doesn't seem necessary to go more than about 1/2" higher on the raised ports for awesome flow.

Lou
Author:  heckshemi [ Wed May 17, 2006 10:56 am ]
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Tim Keith, you're on to something there.
I welded up two 3tc heads about three years ago. I'm still working it. I hope to have one running soon. Sorry if the picture is big.

{Large photo removed by moderator. I tried to make it smaller, but not computer literate enough, so deleted. Please limit the size of your pictures.
The site requirements are: 30k and 400 pixels wide. Thanks Charrlie_S}
Author:  dusty7t4 [ Wed May 17, 2006 12:05 pm ]
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impressive!

let us know how that puppy works

-dave
Author:  AndyZ [ Wed May 17, 2006 12:57 pm ]
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Quote:
Tim Keith, you're on to something there.
I welded up two 3tc heads about three years ago. I'm still working it. I hope to have one running soon. Sorry if the picture is big.
Image
I like that one! Rocker assembly should be interesting...or OHV?
Author:  AndyZ [ Wed May 17, 2006 12:59 pm ]
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Excuse me, Overhead Cam? not OHV
Author:  heckshemi [ Wed May 17, 2006 7:15 pm ]
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It's OHV pushrod head. Very much like a small scale early Chrysler hemi. Stock valve size is slant-like 1.62" IN, 1.42" EX. The head in the picture is machined for 1.73", 1.53" valves. Weight is 28 lbs. bare.
Image
exhaust side
Author:  Patrick Devlin [ Wed May 17, 2006 7:49 pm ]
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Very intersting, Heckshemi. What motor is that welded head going to be mated to? (a slant six!?) What are your ideas for handling the valvetrain, intake, and exhaust manifolds? Very cool project!
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