351C dyno project update

How goes the dyno project?

I do have a question. Were you able to come up with a Port-O-Sonic? I think I read in a previous post that you were waiting for one so Im not sure if you have seen one yet.

I have both the Port-O-sonic intake and a later non clover leaf 4V Torker. I was thinking from a design stand point the Torker looked like a better intake.
My Offy is a 2V that someone ported out to close to a 4v size. I think this effectively kills any taper the manifold might have had in it. What do you think?
I was also wondering what you thought about the plenum in the Port-O-sonic where it has the recessed port dividers. This goes against all modern manifold designs. I would prefer to run the offy as it is shorter than the torker more like a x-celerator.
Just wondering what you thought.
Thanks

Dan,

If you have time feel free to have some port work done on my CHI's for a before and after comparison (I'll expect a discount on the cost of the work ).

Also, I still have a professionally rebuilt, refurbished and modded Holley Ford 4180 carb sitting in it's box from Pony Carbs should you be interested in adding that to the pile?

Also an Offy DP 4V intake that you told me would help me see 40mpg on my Cleveland

Do you want me to ship any of this stuff over the pond?

Phil
79 Longchamp GTS 3061

> How goes the dyno project?

Still got a few things to finish up before the pulls begin.
I've been tied up working on my Triumph TR8 and Dave has been
finishing up some Pontiac big block work. I need to make
another trip down to drop off some additional intake manifolds
and the headers.

> Were you able to come up with a Port-O-Sonic?

Yes, I came up with a Port-O-Sonic for 2V heads.

> My Offy is a 2V that someone ported out to close to a 4v size.
> I think this effectively kills any taper the manifold might
> have had in it. What do you think?

If it was only ported near the cylinder head flange, I agree.
You need to port all the way down the intake to make any improvement.

> I was also wondering what you thought about the plenum in the
> Port-O-sonic where it has the recessed port dividers. This goes
> against all modern manifold designs.

I think that was an attempt to shorten up the longer runners but
I prefer the extended dividers, at least on taller intakes.

> I would prefer to run the offy as it is shorter than the torker
> more like a x-celerator. Just wondering what you thought.

The Torker will probably work better but the Offy is worth at test.
It's pretty easy to swap intakes on a 351C.

> If you have time feel free to have some port work done on my CHI's
> for a before and after comparison (I'll expect a discount on the
> cost of the work Big Grin).

I'll talk to Dave about it. Given your RPM range, I'd recommend
only modest port cleanup.

> Also, I still have a professionally rebuilt, refurbished and
> modded Holley Ford 4180 carb sitting in it's box from Pony Carbs
> should you be interested in adding that to the pile?
> Also an Offy DP 4V intake that you told me would help me see
> 40mpg on my Cleveland Cool

I've got a spreadbore 4V Dual Port and a square bore 2V Dual Port.
Mike Trusty thinks he has a square bore 2V Dual Port. I'll ping
him on it.

> Do you want me to ship any of this stuff over the pond?

I could use the Ford Holley 4180. I'd like to test it on
a stroker Rover V8.

Dan Jones

OK Dan,

You have my e-mail.

Let me have your shipping address again so I can get the carb off to you.

I'd like to see the 4180 on a Cleveland as well as your Rover.

The CFM works out OK on 351 cubes but undoubtedly not on a 408!

Phil