351 C 4v heads

[mrmustangconvert]

I just need to know if those heads are any good. i mean that the intake and exaust ports are huge, you can stick a tennis ball in the intake. but the heads are a d3 casting. anyways im planning on getting a 351c 2v motor and putting the heads on it and see what they will do

[TheJeanyus]

They're great at high rpms. At low rpms they have low port velocity and low end torque suffers. If you're going to put a big cam in it and rev the hell out of it, they'll be awesome. Otherwise, try to round up a set of the highly-desired Australian Cleveland heads with big valves, small(er) ports (still WAY bigger than a lot of heads), and "closed" combustion chambers.

[QWKSNKE]

That's a heavy ass motor to be sticking in a mustang

[mrmustangconvert]

so how much heaver is the 351c compared to the 351w

[LeeH]

Originally Posted by mrmustangconvert

so how much heaver is the 351c compared to the 351w

about 80#s

[coupe]

The heads will do nothing for you. But there's a big enough following for the 351C that you might stand to make some $green off of the motor and those heads.

[LeeH]

Originally Posted by TheJeanyus

They're great at high rpms. At low rpms they have low port velocity and low end torque suffers. If you're going to put a big cam in it and rev the hell out of it, they'll be awesome. Otherwise, try to round up a set of the highly-desired Australian Cleveland heads with big valves, small(er) ports (still WAY bigger than a lot of heads), and "closed" combustion chambers.

I ran Clevelands for years, Lots of myths and misinformation about them. Yes the ports are very large and not very efficient but many years ago MPG started making port tongues that raised the port floor, This increases velocity and flow. We have made alot of HP with the early closed chamber 4v heads heads, Cheap and effective. The Aussie heads are the same as the 2v Cleveland heads except they have the early 4v closed chamber, The valves in all of the 4v heads are 2.19 intake and 1.71 exhaust while the 2v and Aussie heads have 2.05 intake and 1.65 exhaust. The only exception was the 69 Boss 302 which had 2.25 intake and 1.71 exhaust.

[Craig K.]

At one time (when I was working in the motor shop) we were investigating runing a C head on a W block.

As I recall there wasn't too much you had to do (most machine shops should be able to do it), I recall have to plug one water port, and drill open another, but this was 12+ years ago, so I do not recall it exactly.

This would allow you to run those heads on a lighter W block, may be worth looking into.

[TheJeanyus]

Originally Posted by Craig K.

At one time (when I was working in the motor shop) we were investigating runing a C head on a W block.

As I recall there wasn't too much you had to do (most machine shops should be able to do it), I recall have to plug one water port, and drill open another, but this was 12+ years ago, so I do not recall it exactly.

This would allow you to run those heads on a lighter W block, may be worth looking into.

Before doing that, I would sell the C heads to someone and buy a set of nice aluminum W heads. Easier, lighter, and would probably make more power.

[SkurdalenFox]

According to the Head Flow Numbers website in the sticky at the top of this forum, a set of AFR165 heads will out flow C4v heads.

Ford Racing.com has rudimentary instructions for making a Clevor.