All Small Six Back in the Saddle

[pmuller9]

Would you consider using the Ford 300 connecting rods, 6.21" rod length with a custom piston with a 1.300" CH?
Then you could adjust the compression ratio with the piston dish volume and have good quench.

A mechanical lifter camshaft with valve lift near .600" and a .050" duration around 230 degrees on a 108 LSA would give you plenty of power.
A roller mechanical would be even better.
The compression ratio would be close to 10:1

 

[drag-200stang]

I think that to get .600'' lift on a 200/250 head, one would need to check clearance from retainer to valve seal. Taller valves may be needed and better than making a short guide shorter.

 

[pmuller9]

I think that to get .600'' lift on a 200/250 head, one would need to check clearance from retainer to valve seal. Taller valves may be needed and better than making a short guide shorter.

Yes, the valves are short.
We ran into that problem with the VI alloy head.
Manley was kind enough to make longer valves.

 

[Invectivus]

Which serpentine balancer did you go with for the 250, 4.6 ford, or the 96 (I think) big six?

 

[cr_bobcat]

Which serpentine balancer did you go with for the 250, 4.6 ford, or the 96 (I think) big six?

I want to say it was the 96 300 balancer. It fit right on like a charm. That said, I didn't try to verify timing mark lines up correctly, but that's an easy fix down the road. I believe it's a 6 rib balancer as stated in the past by someone as opposed to 8.

 

[cr_bobcat]

Would you consider using the Ford 300 connecting rods, 6.21" rod length with a custom piston with a 1.300" CH?
Then you could adjust the compression ratio with the piston dish volume and have good quench.

A mechanical lifter camshaft with valve lift near .600" and a .050" duration around 230 degrees on a 108 LSA would give you plenty of power.
A roller mechanical would be even better.
The compression ratio would be close to 10:1

I wasn't planning on changing the rotating assembly since my goal isn't a racer. I wouldn't want to make that build with an iron head anyway, I would go with either a VI or an Arg head in that case. Both options there have drawbacks that I don't want to go down currently. The roller cam is mostly a can I find a way to do this that someone with reasonable mechanical ability can do while increasing reliability and performance. Flat tappet lifters have been kind of hit or miss for awhile now from the stories I hear, couple that with the need for high ZDDP oil are making me want to get that figured out. That said, roller lifters are a LOT more expensive! LoL