Ultradyne cams

[Bluefish]

Anyone ever use one of Harold Brookshire's SFT cams? I'm looking at a 294/298 276/271 on a 108 with .650/.620 lift for my 511. Currently going 10.06@134 and looking for more. This cam has the NF63 NF64 lobes. Thanks

 

[PRHeads]

I'm looking at a 294/298 276/271 on a 108 with .650/.620 lift for my 511......... This cam has the NF63 NF64 lobes.

Might want to double check those specs.

NF63 - [email protected], [email protected], .4058 lobe lift
NF64 - [email protected], [email protected], .4134 lobe lift

 

[Bluefish]

Might want to double check those specs.

NF63 - [email protected], [email protected], .4058 lobe lift
NF64 - [email protected], [email protected], .4134 lobe lift

What do you see that looks out of place? These are the specs that Tim@Bullet gave me.

 

[Budnicks]

a .4058 with a 1.5:1 ratio rocker = .6087 gross valve lift. not including lash
you had 0.650 lift mentioned

What do you see that looks out of place? These are the specs that Tim@Bullet gave me.

good luck

 

[Bluefish]

a .4058 with a 1.5:1 ratio rocker = .6087 gross valve lift. not including lash
you had 0.650 lift mentioned

good luck

I’m using a 1.6/1.5 combo.

 

[bearman]

Bluefish tell us more about the rocker combo and why please curious minds need to know. Thank you

 

[Bluefish]

I use a 1.6 rocker on intake and 1.5 on the exhaust. The exhaust gas is under high pressure when it opens and empties the cylinder without issue. The intake valve needs all the help it can get getting the cylinder filled. That's why you always see the exhaust valve smaller than the intake valve. A 1.6 rocker on exhaust side has been found to improve nothing.

 

[bearman]

Thanks for the follow up. Makes good sense to me now that I think about it.

 

[Budnicks]

I’m using a 1.6/1.5 combo.

0.4058 x 1.6 =0.64928" gross valve lift not including lash

makes a difference for damn sure 10%

 

[Bluefish]

0.4058 x 1.6 =0.64928" gross valve lift not including lash

makes a difference for damn sure 10%

I figured actual lift with lash would be about .633" on the intake.

 

[Bluefish]

Anyone ever use one of Harold Brookshire's SFT cams? I'm looking at a 294/298 267/271 on a 108 with .650/.620 lift for my 511. Currently going 10.06@134 and looking for more. This cam has the NF63 NF64 lobes. Thanks

 

[furious70]

I used a 590/613? of his 20 yrs ago with crane ductile rockers.
Only cam that big I've ever used and the only one that beat up adjusters and broke stuff. Maybe my fault, maybe the ramps on his lobes.

 

[rumblefish360]

I use a 1.6 rocker on intake and 1.5 on the exhaust. The exhaust gas is under high pressure when it opens and empties the cylinder without issue. The intake valve needs all the help it can get getting the cylinder filled. That's why you always see the exhaust valve smaller than the intake valve. A 1.6 rocker on exhaust side has been found to improve nothing.

The exhaust mention is often true and if found otherwise, IE; more lower is made, there is probably something that could be improved. A minor pick up is one thing, pick up a bunch.... that’s another.

I have a W5 small block I’m building with a NF split cam.
*I Think* I have the same lobes as well. I’d have to dig it up. It’s a slow process.
Staying tuned to this....

 

[Bluefish]

The exhaust mention is often true and if found otherwise, IE; more lower is made, there is probably something that could be improved. A minor pick up is one thing, pick up a bunch.... that’s another.

I have a W5 small block I’m building with a NF split cam.
*I Think* I have the same lobes as well. I’d have to dig it up. It’s a slow process.
Staying tuned to this....

Harolds cams are aggressive. This one has 5* more duration at .200 than my current comp cam(270/276@50 .640 110)