[73BGTA]

I can’t find any info on it. But I’m considering getting it for my 455.

[PAUL K]

It's an old outdated Crane design. But pretty cool one popped up. I ran one in a 400 about forty years ago and it ran fine with a nice lope.

[73BGTA]

Originally Posted by PAUL K

It's an old outdated Crane design. But pretty cool one popped up. I ran one in a 400 about forty years ago and it ran fine with a nice lope.

Awesome.

I’m considering it because it’s a NOS cam and I wouldn’t have to worry about the new cheap cores.

But not sure if it’s too big for my stock 455 build.

[Formulas]

Gonna need some info on heads being used ... good cam for a stock 1970 #64 head 455 .... for a stock 1973 #4X head 455 ? not so much .

[performerrpm]

my glasses must be do for an upgrade....for the life of me i cannot find the duration on that cam card ...where is it? lol

come to think of it i dont even see the lsa, but looking at the .050 timing, wouldnt that cam have 0 overlap meaning its probably a little on the small side?

[steve25]

Good cam for a 455 with 9.5 comp.

If you have iron D port heads they will need to be set up for that cams lift even if you’re just running 1.5’rockers.

Vehicle wise if you have a auto trans you will want a higher stall converter and a minimum of 3.23 rear gears.

[johnta1]

my glasses must be do for an upgrade....for the life of me i cannot find the duration on that cam card ...where is it? lol

I think the area that says Lift has the duration - 298 int 310 exh?

But the advertised open/close numbers listed show something different?

[Steve C.]

Sales ad for that cam.....

https://www.ebay.com/itm/29681911800...tion=view_item

Note same serial number on the cam card


For interest try using the timing events calculator

http://www.wallaceracing.com/camcalc.php



.

[Steve C.]

Not that it relates here but a VERY early Crane catalog listing for 57-78 Chevy has the SSH-310-NC as a single pattern HFT cam.

Adv 310
.050 236
114LSA
.468 lift


.

[Jay S]

That is one of those old Crane cam cards that show the Asymmetrical closing ramps, they stopped doing that sometime in the 80s. I didn’t take time and do all the math but it roughly looks like it is 222*/232*@.050” tappet and ground on a 114* LSA with about a 110* ICL.

The top advertised number (left side column) is lobe lift (at the valve lift on the right side column with 1.5s and 1.65s). The next numbers below that are actual seat time number (310/320 @.0021” tappet with a 114 LSA and a ICL 114* (instead of the 110* that it has at .050”, which is showing the Asymmetric’s of the closing ramps on the cam. (EDIT) I missed the .0021” rating at first. It is rated at a lower seat rating than I recall. The 310/320 is very misleading. It is not a big cam


I would not use that cam on a very high compression 455, 9.5 SCR would be about max in a 455 for pump gas. If you go higher compression than that there would need to be some extra engine mods. Preferably I would say 9ish compression with a 455, and a stock stall with highway gears would be ok as long as the compression is around 9. Reminds me some of a HC01 version HO enterprise's cam that had the wider LSA, that Crane mostly has less lift.

[PAUL K]

Originally Posted by Jay S

That is one of those old Crane cam cards that show the Asymmetrical closing ramps, they stopped doing that sometime in the 80s. I didn’t take time and do all the math but it roughly looks like it is 222*/232*@.050” tappet and ground on a 114* LSA with about a 110* ICL. Then that top advertised number is lobe lift (at the valve lift on the right column with 1.5s and 1.65s). The next numbers below that are actual seat time number (310/320 @.0021” tappet with a 114 LSA and a ICL 114* (instead of the 110* that it has at .050”, which is showing the Asymmetric’s of the closing ramps on the cam. (EDIT) I missed the .0021” rating at first. It is rated at a lower seat rating than I recall. The 310/320 is very misleading. It is not a big cam


I would not use that cam on a very high compression 455, 9.5 SCR would be about max in a 455 for pump gas. If you go high than that it better have some extra engine mods. Preferably I would say 9ish compression with a 455, and a stock stall with highway gears would be ok as long as the compression is around 9 with the bigger cube combos. Reminds me some of a HC01 cam HO enterprise's cam with less lift.

Good info but the exhaust is 230 @ .050 .... It closes two degrees before TDC. It's the same exhaust lobe they used on their Blazer cam. Ironic Crane screwed around more than any company with their advertised duration numbers and they're the ones recognized for coming up with the lobe "intensity" formula. Like you said the advertised numbers make it look much larger than it is.

[Jay S]

Originally Posted by PAUL K

Good info but the exhaust is 230 @ .050 .... It closes two degrees before TDC. It's the same exhaust lobe they used on their Blazer cam. Ironic Crane screwed around more than any company with their advertised duration numbers and they're the ones recognized for coming up with the lobe "intensity" formula. Like you said the advertised numbers make it look much larger than it is.

I thought I accounted for the -2. 178+54=232* by the cam card. Maybe I need a cup of coffee though. That whole cam card looked like Greek when I first looked at it. lol

[Steve C.]

"Ironic Crane screwed around more than any company with their advertised duration numbers and they're the ones recognized for coming up with the lobe "intensity" formula"


Intensity was a Harvey Crane invention and he had the hydraulic Intensity as the difference between .004" and .050".

It has been stated 0.004” is the accepted estimate of internal deflection in a hydraulic lifter when the valve starts to open.

Edit..... In addition Harold Brookshire stated both Harvey and he design Unsymmetrical cams, where the opening side and the closing side are different everywhere except at the nose.
This now can involve the difference in intensity on the opening and closing sides of the cam lobe.


.

[PAUL K]

Originally Posted by Jay S

I thought I accounted for the -2. 178+54=232* by the cam card. Maybe I need a cup of coffee though. That whole cam card looked like Greek when I first looked at it. lol

Everything looks Greek before that first cup of coffee..... I think you are correct. Man last night I was coming up with 230.

[73BGTA]

Originally Posted by Formulas

Gonna need some info on heads being used ... good cam for a stock 1970 #64 head 455 .... for a stock 1973 #4X head 455 ? not so much .

.030 4X heads thats about it.

Originally Posted by steve25

Good cam for a 455 with 9.5 comp.

If you have iron D port heads they will need to be set up for that cams lift even if you’re just running 1.5’rockers.

Vehicle wise if you have a auto trans you will want a higher stall converter and a minimum of 3.23 rear gears.

What will have to be done to the heads? screw in studs im guessing?

Originally Posted by Jay S

That is one of those old Crane cam cards that show the Asymmetrical closing ramps, they stopped doing that sometime in the 80s. I didn’t take time and do all the math but it roughly looks like it is 222*/232*@.050” tappet and ground on a 114* LSA with about a 110* ICL.

The top advertised number (left side column) is lobe lift (at the valve lift on the right side column with 1.5s and 1.65s). The next numbers below that are actual seat time number (310/320 @.0021” tappet with a 114 LSA and a ICL 114* (instead of the 110* that it has at .050”, which is showing the Asymmetric’s of the closing ramps on the cam. (EDIT) I missed the .0021” rating at first. It is rated at a lower seat rating than I recall. The 310/320 is very misleading. It is not a big cam


I would not use that cam on a very high compression 455, 9.5 SCR would be about max in a 455 for pump gas. If you go higher compression than that there would need to be some extra engine mods. Preferably I would say 9ish compression with a 455, and a stock stall with highway gears would be ok as long as the compression is around 9. Reminds me some of a HC01 version HO enterprise's cam that had the wider LSA, that Crane mostly has less lift.

Sounds like a good fit for my engine then. I'm between this and an 068 but Im weary of the new cam cores.

[PAUL K]

Originally Posted by 73BGTA

Sounds like a good fit for my engine then. I'm between this and an 068 but Im weary of the new cam cores.

You'd be light years ahead by getting a modern designed cam and having it Nitrided. Neither of those cams are designed to build cylinder pressure by today's standards and that is what a low compression 455 is going to want.

Don't blame you for being skeptical but after all the dust settled "soft" lifters turned out to be the real issue.

[Steve C.]

"We should also go through some information about opening and closing points as well. Each cam company calls out valve opening and closing points differently.
For example, a Comp Cams timing card >> will indicate opening and closing points at 0.006 inch of tappet lift.
Crane delivers the opening and closing points at both 0.004 inch and 0.050 inch of tappet lift."

Source:
https://www.motortrend.com/how-to/14...camshaft-info/

This article was from 2003
Keeping in mind the Crane cam card presented here is VERY old and way before that timeline.
So maybe the statement regarding Crane using 0.004 inch is not always correct.
Note the cam card states "Timing checked with dial indicator at a tappet lift of .0021

Also the Wallace calculator for timing events states to Use Advertised Durations - usually at .006"


.

[steve25]

Anytime your cam is pumping more then .425” lift and you’re running the needed spring pressure for a Hipo cam, then yes screw in rocker studs are needed .

Also once your cam’s valve lift gets to .460” or greater then besides the needed springs the valve guides need to be machined for more retainer to seal clearance and while that’s getting done top the guides for the use of positive seals.

This is what you’ll end up with.

One question I have about your heads since they do not have screw in studs is does this set of 4X heads have the needed 2.11” intake valves ?

[performerrpm]

Originally Posted by johnta1

I think the area that says Lift has the duration - 298 int 310 exh?

But the advertised open/close numbers listed show something different?

i thought might be the lobe lift since across from it , the lift with rockers are shown.

[performerrpm]

Originally Posted by Jay S

I thought I accounted for the -2. 178+54=232* by the cam card. Maybe I need a cup of coffee though. That whole cam card looked like Greek when I first looked at it. lol

maybe u need sone fresh glasses like this guy...lol