Torque of 312


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By Flying Jester - 16 Years Ago
What kind of torque output can I expect from a 312? It's not especially high performance, but it has some sort of special headers and a 4bbl carburettor.
By mctim64 - 16 Years Ago
Good torque!  The numbers can change from car to car but factory specs for the '56 T-Bird 312 show 324 @ 2600.
By Flying Jester - 16 Years Ago
Thanks, that's around what I was planning for.

But 2600 RPM! The Y-Block would have made a better marine engine that the chevy small block! What kind of RPM do you guys normally run your cars up to? And what what kind of final ratio do T-birds normally have?
By speedpro56 - 16 Years Ago
With good valve springs and push rods a decent cam going to 5000 rpms should be easy, however I would recommend balancing the assembly for longevity. If this is done then 6000 + rpms can be achieved if you want it. If you're looking at doing something like this keep in mind the engine has to breath good and that means good heads Gs or 113s, intake 1957 and later 4V etc. Hope this helps.Cool
By Ted - 16 Years Ago

Here’s the link to the thread showing the dyno sheet posted by Al for the his 312.  Good torque numbers.

http://www.y-blocksforever.com/forums/Topic1046-4-1.aspx

By Noob - 16 Years Ago
I hadnt seen Al's post before, thanks Ted for posting link.

Would it have made a difference whether the displacement was achieved largely overboring a 292 block versus a lesser boring of a 312... assuming neither block suffered badly from core shift.? I have a .020 over 312 block, which I was planning the next build around, but I also have a .040 292 block with some room left. So, any reason to use one over the other?

Also, when Al references "stock rockers", would that mean small or large ratio... I assume small ratio, and wonder if larger ration would have contributed postively to breathability/flow?

Thanks... Brian

By bird55 - 16 Years Ago
"Also, when Al references "stock rockers", would that mean small or large ratio... I assume small ratio, and wonder if larger ration would have contributed postively to breathability/flow?"


Stock rockers were at the time rebuilt NAPA small ratio rockers. Because I had them on hand. Higher ratio would probably help.
By bird55 - 16 Years Ago
Just to clarify, this was a 292 bored and stroked, not a 312. My preference, actually.

Stroking makes the torque. Torque is what you feel, not horsepower.
By Flying Jester - 16 Years Ago
I've heard that before, about the torque, but it went:

"Torque wins races, Horsepower sells cars"

My 312 is bored to 332, actually. Plus full headers and enlarged exhaust valves.
By RB - 16 Years Ago
As Jerry Christianson so eleganty puts it: Y Block .... torque of a locomotive, RPM of a die grinder
By gritsngumbo - 16 Years Ago
RB (12/8/2009)
As Jerry Christianson so eleganty puts it: Y Block .... torque of a locomotive, RPM of a die grinder


That's FUNNY!