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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   572 tall deck cam (https://www.offshoreonly.com/forums/general-q/364903-572-tall-deck-cam.html)

chris302 02-10-2020 05:24 PM
Originally Posted by GPM (Post 4724738)
Is the cam bearing journal all chewed up or am I seeing things ?
Jounals are fine. Several lobes have edges cut into lobes and what looks like stress cracks.

chris302 02-10-2020 05:35 PM
Originally Posted by GPM (Post 4724737)
Any chance that's to .020 number, not the .050.
  • Advertised Exhaust Duration: 296
  • Advertised Intake Duration: 288
  • Assembly Lubricant Included: No
  • Basic Operating RPM Range: 3200-6,500
  • California Proposition 65: WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
  • Cam Type: Solid Roller
  • Camshaft Gear Attachment: 3-Bolt
  • Camshaft Material: Billet Steel
  • Camshaft Series: Puller and Mud Race
  • Engine Family: Chevrolet 396-454 c.i. 8 Cylinder (1967-1996)
  • Exhaust Duration at .050 inch Lift: 261
  • Exhaust Valve Lift: 0.68
  • Grind Number: 288AR-8
  • Intake Duration at .050 Inch Lift: 253
  • Intake Valve Lift: 0.68
  • Lifter Style: Solid Roller
  • Lifters Included: No
  • Lobe Separation: 108
  • Title: Puller/Mud Race/Oval Track 251/260 Solid Roller Cam Chevrolet Big Block 396-454
  • Usage: Strip
  • Valve Springs Required: Yes

ICDEDPPL 02-10-2020 06:14 PM
okay that makes more sense , 253/261 still shouldn`t be running out of steam so early thou .
Something `s not right

chris302 02-10-2020 06:31 PM
Originally Posted by ICDEDPPL (Post 4724776)
okay that makes more sense , 253/261 still shouldn`t be running out of steam so early thou .
Something `s not right
comp catalog shows 2 spring options on this cam this is the on i believe are in now
Camshaft Type
OEM
Camshaft Type
Roller
Quantity
Sold as a set of 16
Coated
No
Damper Spring Included
Yes
Number of Springs Per Valve
Dual
Valve Spring Style
Standard
Outside Diameter of Outer Spring (in.)
1.539
Position
N/A
Inside Diameter of Outer Spring (in.)
1.125
Spring Type
Double
Inside Diameter
0.731 in.
Outside Diameter
1.539
Spring Rate
490 lbs./in.
Inside Diameter of Inner Spring (in.)
0.731
Manufacturer's Part Number:
26097-16
Shipping Weight:
5.71
Package Height:
3.7
Package Depth:
2.9
Package Width:
13.5
The other is 734 lb. In Pressure
my thought is it needs the bigger spring.

chris302 02-10-2020 06:34 PM
Camshaft Type
Hydraulic
Camshaft Type
Mechanical
Quantity
Sold as a set of 16
Coated
No
Damper Spring Included
No
Number of Springs Per Valve
Dual
Valve Spring Style
Standard
Outside Diameter of Outer Spring (in.)
1.57
Position
N/A
Inside Diameter of Outer Spring (in.)
1.12
Spring Type
Double
Inside Diameter
0.796 in.
Installed Height (in.)
1.95
Installed Pressure (lbs.)
190
Open Height (in.)
1.2
Open Pressure (lbs.)
747
Spring Rate (lbs./in.)
743
Outside Diameter
1.57
Spring Rate
753 lbs./in.
Inside Diameter of Inner Spring (in.)
0.796
Coil Bind Height
1.1 in (27.94 mm)
Manufacturer's Part Number:
944-16
Shipping Weight:
5.58
Package Height:
13.6
Package Depth:
2.9
Package Width:
3.7

sutphen 30 02-10-2020 07:11 PM
Originally Posted by ICDEDPPL (Post 4724725)
That is a lot of duration (288/296) and it start to fall on it`s face at 5000rpm?
That thing should pull till 6500+ , wonder what`s going on there.
Mine is blown ,548ci. 247/254 , still making power at 6200, stalls at 6400 , starts to drop off at 6500rpm.
merlin 320 heads,,those heads suck.
you'd be better off w/ cheap chinesium heads or EQ320's.

GPM 02-10-2020 07:42 PM
Originally Posted by chris302 (Post 4724771)
  • Advertised Exhaust Duration: 296
  • Advertised Intake Duration: 288
  • Assembly Lubricant Included: No
  • Basic Operating RPM Range: 3200-6,500
  • California Proposition 65: WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
  • Cam Type: Solid Roller
  • Camshaft Gear Attachment: 3-Bolt
  • Camshaft Material: Billet Steel
  • Camshaft Series: Puller and Mud Race
  • Engine Family: Chevrolet 396-454 c.i. 8 Cylinder (1967-1996)
  • Exhaust Duration at .050 inch Lift: 261
  • Exhaust Valve Lift: 0.68
  • Grind Number: 288AR-8
  • Intake Duration at .050 Inch Lift: 253
  • Intake Valve Lift: 0.68
  • Lifter Style: Solid Roller
  • Lifters Included: No
  • Lobe Separation: 108
  • Title: Puller/Mud Race/Oval Track 251/260 Solid Roller Cam Chevrolet Big Block 396-454
  • Usage: Strip
  • Valve Springs Required: Yes
That's great but you're running a 572

GPM 02-10-2020 07:46 PM
Originally Posted by chris302 (Post 4724769)
Jounals are fine. Several lobes have edges cut into lobes and what looks like stress cracks.
Guessing not enough spring pressure and the lifters are bouncing off of the lobes. Could be the pushrods flexing. Maybe call someone like Bullet, tell them what you want to do and have them spec the cam, lifters and springs.

chris302 02-10-2020 08:53 PM
Originally Posted by sutphen 30 (Post 4724787)
merlin 320 heads,,those heads suck.
you'd be better off w/ cheap chinesium heads or EQ320's.
i agree, but not in the budget right now.

flashgordon 02-11-2020 05:47 AM
Originally Posted by hogie roll (Post 4724713)
I haven’t used them, but I like the idea of bushing lifters. Less weight and low or no fallout from a failure that could take out an engine.
if you are talking about the red zone isky lifters,,yes i was told them are bullet proof....
but they are taller than normal lifters.
i found this out the hard way ,,,lifters were crashing into my intake valley baffle ,,,destoyed it baffle
i caught it before got really bad ,,,thankfully mu eix filters caught all the metal.
i did a post on this.
so i removed intake valley baffles.
https://cimg9.ibsrv.net/gimg/www.off...77c0339d06.jpg


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