[FMile Pontiacs]

Hey guys,
I stumbled across this old Ultradyne camshaft that is in usable shape. I have found a number stamped on the back.
The number is 37947. I assume this is the part number. Do you all have any idea what the specs are for this camshaft?

I have also posted in the race section.

[mgarblik]

I have several Ultradyne catalogs. The number you posted is not enough. Typically Ultradyne cams would hand engrave lots of important information either on the front of the cam #1 bearing journal as you face it. or across the back of the #5 bearing journal. Typically it would say UD for Ultradyne, then the duration, then the LSA would also be listed. Sometimes they would list the lift, but generally not. As I said, I have a master catalog of everything they made up to the time of Harold Brookshire's death. Be happy to look up with more info.

[FMile Pontiacs]

The information stamped on the back of cam, #5 cam bearing jounal

37947
274/284
370.571

thanks. Joe

[Steve C.]

UltraDyne Master List

http://www.bulletcams.com/Masters/ultradynemasters.html

And if interested the Pontiac page from a old UltraDyne catalog:

http://web.archive.org/web/200303250..._camshafts.htm

(see HOME on the link for more info )


.

[FMile Pontiacs]

thanks steve, what I have must be a custom grind with the 274/282 adv. dur because it isn't listed on the master list nor the old UltraDyne list
I couldn't find anything for the # 370.571 or the #37947 so I may not use this came not knowing the specs. Thank you for the information you sent. Joe

[TedRamAirII]

I suppose someone could get that cam, and with a Degree wheel and dial indicator, then you would have the all the spec.

["QUICK-SILVER"]

Originally Posted by FMile Pontiacs

274/284

Originally Posted by FMile Pontiacs

thanks steve, what I have must be a custom grind with the 274/282 adv. dur because it isn't listed on the master list nor the old UltraDyne list

274, 284 and the 282 are there. H10, H18 and H25.
http://web.archive.org/web/200301140.../hydraulic.htm

Subtract base circle OD from base/lobe measurement to see if lift matches up.

Like Ted said to get lobe sep and verify what's what.

Clay

[FMile Pontiacs]

Thanks for the info...I think that is just what I needed.

[Skip Fix]

Hard to beat a good UD cam!

[Tom Vaught]

Just an assumption based on what everyone posted but to me the camshaft looks like a "optimized" Harold B RA-IV Hydraulic Camshaft.

Tom v.

[Steve C.]

In the link I posted above within the Pontiac section....

"Need a replacement for your worn-out RamAir IV cam? This one makes more power. Can use 1.65s for .515 valve lift."

282/290-114

.

[Skip Fix]

The 288/296 has 231/239 @ 0.050 like the RAIV and performs pretty darned good also.

[Steve C.]

Regarding a "RAIV" substitute with the two UltraDyne hyd flat tappet cams mentioned here and noted below should bring out some interesting comments and emotions


282/290 114 LSA .468/.468 233/241

288/296 110 LSA . 485/.507 231/239


.

[Stan Weiss]

Did you ever uses this cam before?

Do you know if it is hydraulic or solid lifter?

Flat tappet or roller?

If the 274/284 is duration then is it seat-to-seat or 0.050"

R63 310 274

R64 320 284

Stan

[FMile Pontiacs]

Stan it is a hydraulic cam. a friend ran it in a 69 400 4 speed gto. I was thinking it may also be a good cam to use in my 70 gto 455 with casting number 96 d port heads with
headers, modified turbo 350 transmission and 355 rear end. It should be pump gas engine.

[FMile Pontiacs]

Duration is 274/282

[68WarDog]

Originally Posted by FMile Pontiacs

Duration is 274/282

Is that the advertised or 0.050 duration?

[FMile Pontiacs]

advertised 274/282 and 226/233 0.050