Home » Public Forums » GMCnet » Factory 455 Camsaft Specs
| Factory 455 Camsaft Specs [message #296336] |
Sun, 28 February 2016 07:23  |
dr.diesel
Messages: 85
Registered: April 2015
Location: The Haute, Indiana
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I thought for-sure I'd found this information before, but after extensive searching I'm still lost!
I'm searching for the factory 455 cam specs, I'm assuming all GMCs with the 455 had the same Cam.
Lobe Center Angle:
Intake Centerline:
Intake/Exhaust Duration:
If anyone has the same info for popular aftermarket grinds, ie Jim'sB cam that would be great also.
My goal is Dyno simulations etc.
Many thanks.
77 Kingsley
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| Re: [GMCnet] Factory 455 Camsaft Specs [message #296338 is a reply to message #296336] |
Sun, 28 February 2016 09:10  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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There were many different cams used by Olds throughout the years that the
455 was produced. Particularly if you include the Agricultural and Marine
versions, Crusader and Mercruiser, and Outboard Marine Corporation, Volvo
Penta to name a few.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Feb 28, 2016 5:24 AM, "Andy" wrote:
> I thought for-sure I'd found this information before, but after extensive
> searching I'm still lost!
>
> I'm searching for the factory 455 cam specs, I'm assuming all GMCs with
> the 455 had the same Cam.
>
> Lobe Center Angle:
> Intake Centerline:
> Intake/Exhaust Duration:
>
> If anyone has the same info for popular aftermarket grinds, ie Jim'sB cam
> that would be great also.
>
> My goal is Dyno simulations etc.
>
> Many thanks.
> --
> 77 Kingsley
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: Factory 455 Camsaft Specs [message #296349 is a reply to message #296337] |
Sun, 28 February 2016 13:13 |
dr.diesel
Messages: 85
Registered: April 2015
Location: The Haute, Indiana
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KB wrote on Sun, 28 February 2016 10:15If you go to the Melling catalog and enter your engine info, it will tell you stock and other grinds.
For the 455, that's Melling MC1287 (stock) or MTO-1 (rv grind commonly used here.)
Karen
Perfect, thank you!
77 Kingsley
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| Re: Factory 455 Camsaft Specs [message #296410 is a reply to message #296336] |
Mon, 29 February 2016 11:05 |
Chris Tyler
Messages: 458
Registered: September 2013
Location: Odessa FL
Karma: 7
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Desktop dyne is fun to play with. Its more accurate at times than others.
Regarding the cam duration though, isnt that supposed to be duration at .050? As I recall it was on mine, but may have been a different version
I believe I have the melling cam in mine [winterfeldt engine circa 2002]
May be wrong but as I recall the LSA was 110.
76 Glenbrook
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| Re: Factory 455 Camsaft Specs [message #296418 is a reply to message #296336] |
Mon, 29 February 2016 14:24 |
Chris Tyler
Messages: 458
Registered: September 2013
Location: Odessa FL
Karma: 7
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Yes. It looks like the values inputed are advertised duration, which varies widely whereas the .050 figures are consistent.
Based on a torue peak of ~ 4000 on a 455 cid, Id guesstimate it to be ~235-240 degrees at .050
76 Glenbrook
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| Re: Factory 455 Camsaft Specs [message #296422 is a reply to message #296336] |
Mon, 29 February 2016 16:42 |
dr.diesel
Messages: 85
Registered: April 2015
Location: The Haute, Indiana
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Well, although this started as fun, it's just switched to real!
A bit of background. I bought this GMC last year from the 2nd owner, he'd owned it since the late 70s. It's condition was pretty good, but had numerous exhaust leaks, a few other minor things. Well, since I've just completed the exhaust, nice and quiet, I noticed a slight bottom end knock, something that wasn't noticeable before with all the exhaust leaks. After hearing that I fired off an oil sample to Blackstone, got the bad news back today:
Engine has 102k, oil pressure is 1/2 to 3/4 the way up the mostly worthless unmarked gauge! ha ha I don't have much in the way of engine records, but given what I've been fixing over the past year the previous owner wasn't much of a mechanic.
I'm not too broken hearted about it, I'm 40 years old, plan to keep this thing till I fall over dead. Hopefully with some nice thick oil I can keep it together through the mostly local events this summer, then overhaul during the cold months.
If this was a car, I'd be tempted to rush and overhaul before spring hit, I once yanked the engine out of my 72 Olds in 30 minutes. Not as easy on this beast!
77 Kingsley
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| Re: Factory 455 Camsaft Specs [message #296430 is a reply to message #296422] |
Mon, 29 February 2016 18:42 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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dr.diesel wrote on Mon, 29 February 2016 16:42Well, although this started as fun, it's just switched to real!
A bit of background. I bought this GMC last year from the 2nd owner, he'd owned it since the late 70s. It's condition was pretty good, but had numerous exhaust leaks, a few other minor things. Well, since I've just completed the exhaust, nice and quiet, I noticed a slight bottom end knock, something that wasn't noticeable before with all the exhaust leaks. After hearing that I fired off an oil sample to Blackstone, got the bad news back today:
Engine has 102k, oil pressure is 1/2 to 3/4 the way up the mostly worthless unmarked gauge! ha ha I don't have much in the way of engine records, but given what I've been fixing over the past year the previous owner wasn't much of a mechanic.
I'm not too broken hearted about it, I'm 40 years old, plan to keep this thing till I fall over dead. Hopefully with some nice thick oil I can keep it together through the mostly local events this summer, then overhaul during the cold months.
If this was a car, I'd be tempted to rush and overhaul before spring hit, I once yanked the engine out of my 72 Olds in 30 minutes. Not as easy on this beast!
Dennis S
73 Painted Desert 230
Memphis TN Metro
[Updated on: Tue, 01 March 2016 01:43] Report message to a moderator |
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| Re: [GMCnet] Factory 455 Camsaft Specs [message #296463 is a reply to message #296422] |
Mon, 29 February 2016 20:57 |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
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Andy,
Your sender determines the range of your oil pressure dash gauge. Yours should be any 0 to 80 psig sender. That would make each division of the dash gauge 20 PSIG with zero at the bottom. If you have half to 3/4’s then you have 40 to 60 PSIG range and that is pretty good for a 403 and if you have a 455 that is just as good. I run a mechanical pressure gauge teed off at the pressure sender as a check.
J.R. Wright
GMC GreatLaker 18 Year Member
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI 18 Year Member
78 Buskirk 30' Stretch
1975 Avion (Under Reconstruction)
Michigan
> On Feb 29, 2016, at 3:42 PM, Andy wrote:
>
> Well, although this started as fun, it's just switched to real!
>
> A bit of background. I bought this GMC last year from the 2nd owner, he'd owned it since the late 70s. It's condition was pretty good, but had
> numerous exhaust leaks, a few other minor things. Well, since I've just completed the exhaust, nice and quiet, I noticed a slight bottom end knock,
> something that wasn't noticeable before with all the exhaust leaks. After hearing that I fired off an oil sample to Blackstone, got the bad news back
> today:
>
>
>
> Engine has 102k, oil pressure is 1/2 to 3/4 the way up the mostly worthless unmarked gauge! ha ha I don't have much in the way of engine records, but
> given what I've been fixing over the past year the previous owner wasn't much of a mechanic.
>
> I'm not too broken hearted about it, I'm 40 years old, plan to keep this thing till I fall over dead. Hopefully with some nice thick oil I can keep
> it together through the mostly local events this summer, then overhaul during the cold months.
>
> If this was a car, I'd be tempted to rush and overhaul before spring hit, I once yanked the engine out of my 72 Olds in 30 minutes. Not as easy on
> this beast!
>
>
> --
> 77 Kingsley
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Factory 455 Camshaft Specs [message #296475 is a reply to message #296465] |
Tue, 01 March 2016 00:39 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Gary,
Can we assume it is the same for the Motorhome ?
On Mon, Feb 29, 2016 at 7:41 PM, Gary Kosier wrote:
> Well, I never saw any info on this question, so I'll offer my best answer.
> By way of explanation, about 36 years ago, the local Drag Strip
> acquired a new NHRA Spec Book. I managed to "acquire" their old one.
> GMC says the 455 uses camshaft #400117. Here are the
> specs NHRA has listed for this cam.
>
> Checking clearance = .008
> Intake opens = 20°BTC
> Intake closes = 58°ABC
> Overlap = 44°
> Duration = 258°
> Lift = .435"
>
> Exhaust opens =68°BBC
> Exhaust closes = 24°ATC
> Duration = 272°
> Lift = .435"
>
> Gary Kosier
> 77PB w/500Cad
> Newark, Ohio
>
>
>
>
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Factory 455 Camsaft Specs [message #296684 is a reply to message #296463] |
Fri, 04 March 2016 06:51 |
dr.diesel
Messages: 85
Registered: April 2015
Location: The Haute, Indiana
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powwerjon wrote on Mon, 29 February 2016 21:57Andy,
Yours should be any 0 to 80 psig sender.
I've been busy building my custom dash, which includes a proper oil pressure gauge. Still waiting on intake gaskets (Jim needs to move his operation to Indiana, ha ha) but I should soon have it fired up soon and we'll find out.
Given these engine work pretty hard, at 102k miles it's likely pretty tired anyhow, might as well get my rebuild plans together.
Next winter is going to be busy: new engine (likely 4.5" stroke), rebuilt tranny and 3.55 final drive.
77 Kingsley
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| Re: [GMCnet] Factory 455 Camsaft Specs [message #296685 is a reply to message #296684] |
Fri, 04 March 2016 07:12 |
dr.diesel
Messages: 85
Registered: April 2015
Location: The Haute, Indiana
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dr.diesel wrote on Fri, 04 March 2016 07:51new engine
I really wish i'd have gathered my thoughts early on. Being a big GM diesel fan (got (2) 6.5s now, built a 6.2 powered Cutlass that I drove daily for years) if I hadn't already invested a couple grand in the gasser with the headers and intake etc, I would have just gone with Manny's diesel conversion.
77 Kingsley
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