Topic Options
Rate This Topic
#92643 - 10/10/17 08:05 PM Help ID Chevy Cams
chevy2inreno Offline
Active BB Member
**

Registered: 08/26/02
Posts: 59
Loc: Reno, Nv.
I just picked up two cams with a bunch of 230-250-292 parts but can't tell what they are. I was told they are mechanical. The Crane looks like a HMV-272 but also look like it's been stamped twice, is it a regrind?

Looking to get specs and best application on both.

Thanks




Top
#92644 - 10/11/17 05:58 AM Re: Help ID Chevy Cams [Re: chevy2inreno]
CNC-Dude #5585 Offline
Active BB Member
****

Registered: 09/27/08
Posts: 3249
Loc: N. Georgia
I wouldn't worry about a double stamp, regrinds usually have the original numbers obliterated with a series of XXXXX's over them. Are these cams ground on 194-250 blanks or 292 blanks. That can deter how they are used somewhat?
_________________________

Inliners International Advertiser

Top
#92649 - 10/11/17 05:34 PM Re: Help ID Chevy Cams [Re: CNC-Dude #5585]
chevy2inreno Offline
Active BB Member
**

Registered: 08/26/02
Posts: 59
Loc: Reno, Nv.
They're both 194-250 cams.

Top
#92650 - 10/11/17 05:39 PM Re: Help ID Chevy Cams [Re: chevy2inreno]
chevy2inreno Offline
Active BB Member
**

Registered: 08/26/02
Posts: 59
Loc: Reno, Nv.
I pulled this info on the Isky cam off Summit Racing:

Brand:Isky Racing Cams
Manufacturer's Part Number:231525
Part Type:Camshafts
Product Line:Isky Oval Track Solid Flat Tappet Camshafts
Summit Racing Part Number:ISK-231525

Cam Style: Mechanical flat tappet
Basic Operating RPM Range: 2,000-6,000
Intake Duration at 050 inch Lift: 228
Exhaust Duration at 050 inch Lift: 228
Duration at 050 inch Lift: 228 int./228 exh.
Advertised Intake Duration: 268
Advertised Exhaust Duration: 268
Advertised Duration: 268 int./268 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.525 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.525 in.
Valve Lift with Factory Rocker Arm Ratio: 0.525 int./0.525 exh.
Lobe Separation (degrees): 109
Intake Valve Lash: 0.025 in.
Exhaust Valve Lash: 0.025 in.
Grind Number: 525-A

But this one is a 525-B, is there a difference?


Edited by chevy2inreno (10/11/17 05:39 PM)

Top
#92652 - 10/11/17 06:04 PM Re: Help ID Chevy Cams [Re: chevy2inreno]
chevy2inreno Offline
Active BB Member
**

Registered: 08/26/02
Posts: 59
Loc: Reno, Nv.
OK, looks like I found the info on the Crane:

Part Number: 204541 Grind Number: H-272-2 (REPLACES HMV-272-2)
Engine Identification:
Year Range Make Cyl Description
62-84 Chevy 6 Good low to mid range torque, good idle, daily usageand off road, towing, performance and fuel efficiency,2600-3000 cruise RPM, 8.75 to 10.5 compression ratioadvised.
Engine Size
194-250 C.I.
Valve Setting: Intake - 0 Exhaust - 560 Hot/Cold - HOT
Lift: Intake @Cam 3027 @Valve 530 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 3200 @Valve 560
Rocker Arm Ratio 1.75
Cam Timing: TAPPET @ 0.004
Lift: Opens Closes ADV Duration
Intake 25.0 BTDC 67.0 ABDC 272
Exhaust 75.0 BBDC 29.0 ATDC 284
Spring Requirements:
Part Number 99838
Loads Closed 112 LBS @ 1.65 or 1.65625
Open 327 LBS @ 1.12
Recommended RPM range with matching components
Minimum RPM 1800
Maximum RPM 5400
Valve Float 6000
Cam Timing: TAPPET @0.05
Lift: Opens Closes Max Lift Duration
Intake 1.0 BTDC 35.0 ABDC 107 216
Exhaust 51.0 BBDC (3.0)BTCD 117 228

Top
#92653 - 10/11/17 06:04 PM Re: Help ID Chevy Cams [Re: chevy2inreno]
chevy2inreno Offline
Active BB Member
**

Registered: 08/26/02
Posts: 59
Loc: Reno, Nv.
Now, which would be best for a 250 with 307 pistons, lumped head and a 4 speed in my 63 Nova?

Top
#92656 - 10/11/17 08:06 PM Re: Help ID Chevy Cams [Re: chevy2inreno]
tlowe #1716 Offline
Active BB Member
****

Registered: 04/01/04
Posts: 3141
Loc: Dysart, Iowa
I guess the question would be: How much would you put up with a temper mental engine?
The second cam looks to be hydraulic lifter, maybe you could use some Rhoads lifters to calm it down some. It will have a pretty good idle with standard lifters.
The 1st cam is a smaller grind and should idle great. Only problem is the solid lifters.
_________________________
12 PORT ADVERTISER
Information and parts http://www.12bolt.com


Top
#92660 - 10/12/17 04:50 PM Re: Help ID Chevy Cams [Re: chevy2inreno]
panic Offline
Active BB Member
**

Registered: 01/11/05
Posts: 1475
Loc: Hempstead, Long Island, NY
Part of the decision should be your "crawl ratio", which is 1st gear X axle ratio.
If the product is 10 or more (2.52:1 Muncie X 4.11:1 axle = 10.4), either cam will probably be acceptable.
If the product is substantially smaller (2.20:1 close ratio box X 3.08:1 axle = 6.8) the milder cam will be easier to live with. If you choose the hotter cam a heavy flywheel will make stop lights less annoying.

Top
#92662 - 10/13/17 09:30 AM Re: Help ID Chevy Cams [Re: panic]
Lifeguard Offline
Active BB Member

Registered: 02/17/14
Posts: 433
Loc: Rockford, IL
Originally Posted By: panic
Part of the decision should be your "crawl ratio", which is 1st gear X axle ratio.
If the product is 10 or more (2.52:1 Muncie X 4.11:1 axle = 10.4), either cam will probably be acceptable.
If the product is substantially smaller (2.20:1 close ratio box X 3.08:1 axle = 6.8) the milder cam will be easier to live with. If you choose the hotter cam a heavy flywheel will make stop lights less annoying.


Yeah, my factory 3.50:1 Saginaw x 2.73:1 axle = 9.3.

Top
#92687 - 10/16/17 12:11 PM Re: Help ID Chevy Cams [Re: chevy2inreno]
chevy2inreno Offline
Active BB Member
**

Registered: 08/26/02
Posts: 59
Loc: Reno, Nv.
Thanks for all the input. Helps a lot.

Top

Moderator:  nln6pinto, will6er 
Who's Online
4 registered (70Nova, efi-diy, stock49, will6er), 38 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Newest Members
Thomas79, octane103, schwoch1, Gregory Sheets, Eric Matwey
6001 Registered Users