350 inch 3v

[assasinator]

So I have a 2011gt and 206,000 miles.

I’m over the coyote. 455/410

Going to build a 350 3v for torque and power.

Just want a lot of low end and max power secondary,

What spec is the biggest cam a 3v can use?

Look at my history. Not my first 5.4 3v in a mustang.

I need max lift for intake and exhaust. Going with 108 to 109 lobe sep.


Fully porting the heads, modding a 4.6 intake.

-bill

 

[Midlife Crises]

You can purchase 0.560” lift cams for the 3 valve right out of Comp Cams catalog but getting 350 cubes out of a 3 valve block is an entirely different matter.

 

[Dino Dino Bambino]

getting 350 cubes out of a 3 valve block is an entirely different matter.

A standard 5.4 3V short block has a cylinder bore of 3.552", a stroke of 4.165", and displaces 330.2ci or 5410cc.
A 5.4 3V block with 3.70" bore Darton sleeves (very expensive) and a 4.165" stroke would displace 358.3ci or 5870cc.

 

[Midlife Crises]

A standard 5.4 3V short block has a cylinder bore of 3.552", a stroke of 4.165", and displaces 330.2ci or 5410cc.
A 5.4 3V block with 3.70" bore Darton sleeves (very expensive) and a 4.165" stroke would displace 358.3ci or 5870cc.

And suffer from valve shrouding and excessive stroke to bore ratio.
If I was going to go full tilt nuts I’d start with a 5.8 4 valve.

 

[Dino Dino Bambino]

And suffer from valve shrouding and excessive stroke to bore ratio.
If I was going to go full tilt nuts I’d start with a 5.8 4 valve.

The Trinity 5.8 has the same 4.165" stroke but with a larger 3.681" bore for a displacement of 355ci or 5812cc. However that extra exhaust valve does improve higher rpm performance and allows the Trinity to rev to 7000rpm. With such a long stroke, that's already pushing the internals near the limit with a mean piston speed of 4860ft/min.

 

[Midlife Crises]

I like the spray on cylinder liner technology used on that block. Give it 4 valves and a positive displacement supercharger to fill the stroke and a 7,000 rpm limit is not a problem.