Help on Performer rpm heads / Valve Springs

[Dave Bilyk]

Hi guys, I need some tech help here from you engine guru's, I was just completing changing to roller lifters with matching cam 302 engine and setting up valve train when I found I didn't quite understand valve spring requirements.

My Roller Lifter Edelbrock #2221 camshaft data requires 110lb closed and 320lb open at lift of .575"
http://www.jegs.com/photos/300/350/350-2221camcard.jpg

According to the head data my #60229 heads are for Flat Tappet and have #5825 springs

For Hydraulic Roller camshafts, the heads would be #60225 with #5845 springs , (same heads?)

http://www.jegs.com/InstallationInstructions/300/350/350-60225.pdf

So what do I do here?, according the the data I have seen, my existing spring loads don't seem too wide of the mark, while the #8245 seem too high, but I can't seem to find definitive information. Are there differences I haven't seen here, do I need to change springs and if so to what?

regards and thanks
Dave

 

[Robert May Eng.]

I cant get the links to work but what you are looking at is the recommended spring pressure at the correct installed height. Then check them again at recommended lift. You can only do this with a proper valve spring gauge, A cheapy will do the job ( http://www.summitracing.com/parts/pro-66834/overview/) . If you dont get this right you could end up with coil bind or inadequate spring pressure at max lift.

Bob

 

[Dave Bilyk]

Thanks Bob, I messed up the links, they should work now.

I need some tech help here from you engine guru's, I was just completing changing to roller lifters with matching cam 302 engine and setting up valve train when I found I didn't quite understand valve spring requirements.

My Roller Lifter Edelbrock #2221 camshaft data requires 110lb closed and 320lb open at lift of .575"
Cam Data Sheet

According to the head data my #60229 heads are for Flat Tappet and have #5825 springs

For Hydraulic Roller camshafts, the heads would be #60225 with #5845 springs , (same heads?)

Heads Installation sheet

So what do I do here?, according the the data I have seen, my existing spring loads don't seem too wide of the mark, while the #8245 seem too high, but I can't seem to find definitive information. Are there differences I haven't seen here, do I need to change springs and if so to what?

regards and thanks
Dave

 

[Robert May Eng.]

Here is the cam card for 2221

•
CAMSHAFT:
Performer RPM Roller Hydraulic
• PART #2221
• ENGINE: Ford 289-302 V8
• RPM RANGE: 1500-6500
•
CAUTION:
Do not use dual valve springs. Use recommended
valve springs with closed pressure of 110 lbs., open pressure of
320 lbs, and lift of .575”. Use stock ratio rocker arms only.
Duration at .004" Lift: Intake 298° Exhaust 302°
Duration at .050" Lift: Intake 227° Exhaust 234°
Lift at cam: Intake .325" Exhaust .325"
Lift at valve: Intake .520" Exhaust .520"
Timing at .050 Lift: Open Close
Intake 6° BTDC 41° ABDC
Exhaust 54° BBDC 0° ATDC
Centerlines:
Lobe Separation: 112° Lobe Centerline: Int: 107° ATDC
Exh: 117° BTDC
• CAUTION:
Use Edelbrock Performer-Link Timing Chain and Gear
Set #7811 or Accu-Drive gear drive #7892. Do not use late
model timing chain and gear sets that are designed for emission-
controlled engines. These timing sets are machined in a retarded
position and are not recommended for this camshaft installation.
Edelbrock Timing Sets feature three keyways for specified timing
selection. Use "0" position for most applications.
©2010 Edelbrock Corporation
Rev. 4/10 - AJ/mc
•
CAMSHAFT:
Performer RPM Roller Hydraulic
• PART #2221
• ENGINE: Ford 289-302 V8
• RPM RANGE: 1500-6500
•
CAUTION:
Do not use dual valve springs. Use recommended
valve springs with closed pressure of 110 lbs., open pressure of
320 lbs, and lift of .575”. Use stock ratio rocker arms only.
Duration at .004" Lift: Intake 298° Exhaust 302°
Duration at .050" Lift: Intake 227° Exhaust 234°
Lift at cam: Intake .325" Exhaust .325"
Lift at valve: Intake .520" Exhaust .520"
Timing at .050 Lift: Open Close
Intake 6° BTDC 41° ABDC
Exhaust 54° BBDC 0° ATDC
Centerlines:
Lobe Separation: 112° Lobe Centerline: Int: 107° ATDC
Exh: 117° BTDC
• CAUTION:
Use Edelbrock Performer-Link Timing Chain and Gear
Set #7811 or Accu-Drive gear drive #7892. Do not use late
model timing chain and gear sets that are designed for emission-
controlled engines. These timing sets are machined in a retarded
position and are not recommended for this camshaft installation.
Edelbrock Timing Sets feature three keyways for specified timing
selection. Use "0" position for most applications.
©2010 Edelbrock Corporation
Rev. 4/10 - AJ/mc
•
CAMSHAFT:
Performer RPM Roller Hydraulic
• PART #2221
• ENGINE: Ford 289-302 V8
• RPM RANGE: 1500-6500
•
CAUTION:
Do not use dual valve springs. Use recommended
valve springs with closed pressure of 110 lbs., open pressure of
320 lbs, and lift of .575”. Use stock ratio rocker arms only.
Duration at .004" Lift: Intake 298° Exhaust 302°
Duration at .050" Lift: Intake 227° Exhaust 234°
Lift at cam: Intake .325" Exhaust .325"
Lift at valve: Intake .520" Exhaust .520"
Timing at .050 Lift: Open Close
Intake 6° BTDC 41° ABDC
Exhaust 54° BBDC 0° ATDC
Centerlines:
Lobe Separation: 112° Lobe Centerline: Int: 107° ATDC
Exh: 117° BTDC
• CAUTION:
Use Edelbrock Performer-Link Timing Chain and Gear
Set #7811 or Accu-Drive gear drive #7892. Do not use late
model timing chain and gear sets that are designed for emission-
controlled engines. These timing sets are machined in a retarded
position and are not recommended for this camshaft installation.
Edelbrock Timing Sets feature three keyways for specified timing
selection. Use "0" position for most applications.
©2010 Edelbrock Corporation
Rev. 4/10 - AJ/mc
•
CAMSHAFT:
Performer RPM Roller Hydraulic
• PART #2221
• ENGINE: Ford 289-302 V8
• RPM RANGE: 1500-6500
•
CAUTION:
Do not use dual valve springs. Use recommended
valve springs with closed pressure of 110 lbs., open pressure of
320 lbs, and lift of .575”. Use stock ratio rocker arms only.
Duration at .004" Lift: Intake 298° Exhaust 302°
Duration at .050" Lift: Intake 227° Exhaust 234°
Lift at cam: Intake .325" Exhaust .325"
Lift at valve: Intake .520" Exhaust .520"
Timing at .050 Lift: Open Close
Intake 6° BTDC 41° ABDC
Exhaust 54° BBDC 0° ATDC
Centerlines:
Lobe Separation: 112° Lobe Centerline: Int: 107° ATDC
Exh: 117° BTDC
• CAUTION:
Use Edelbrock Performer-Link Timing Chain and Gear
Set #7811 or Accu-Drive gear drive #7892. Do not use late
model timing chain and gear sets that are designed for emission-
controlled engines. These timing sets are machined in a retarded
position and are not recommended for this camshaft installation.
Edelbrock Timing Sets feature three keyways for specified timing
selection. Use "0" position for most applications

Here is the edelbrock chart for the recommended valve spring in the heads you have . Notice they recommend the chevy ls1 spring for the use of this cam in the heads you have No 5768. http://www.edelbrock.com/automotive_new/mc/valvetrain/springs_retainers.shtml

Edelbrock.com - Edelbrock Total Power Package® Systems - Performer RPM Power Packages - 1500 to 6500 RPM.

So as the correct valve spring is 5768 I would go with that. The spring recommendations on the cam card you were looking at are for the standard windsor heads which have a different installed height not 1.800".

Bob

 

[Dave Bilyk]

Thanks Bob, I appreciate your help, I never found that, but interestingly it shows "5768, 5825" and 5825 are the ones I already have in the #60229 heads which suggests I don't need to change I think.

regards

 

[Jac Mac]

Dave, measure your springs at those installed /full lift heights and ensure they meet the pressures specified or exceed them, use the retainers & spring seat in use when you do this and ensure that there is sufficient clearance from coil bind at the full lift setting, this is essential with any roller cam to ensure the lifter stays in contact with lobe during the open cycle, any loss of lobe contact will lead to early lifter/lobe failure. Hope the lifters you have chosen have provision for lobe/roller oiling.

 

[Robert May Eng.]

Thanks Bob, I appreciate your help, I never found that, but interestingly it shows "5768, 5825" and 5825 are the ones I already have in the #60229 heads which suggests I don't need to change I think.

regards

I would check with edelbrock because one part number relates to a flat tappet spring and the other a roller cam.

bob