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Discussion Starter · #1 ·
Can any one help me choose the right valve springs for this camshaft:

Part Number: 138551 Grind Number: SR-238/350-2S-12 IG
Engine Identification:
Start Yr. End Yr. Make Cyl Description
1967 Up CHEVROLET 8 FAIR IDLE, MODERATE PERFORMANCE USAGE, GOOD LOW AND MID-RANGE TORQUE AND HP, MARINE PERFORMANCE, MILD BRACKET RACING, AUTO TRANS W/ 3000+ CONVERTER, 3400-3800 CRUISE RPM, 10.5 TO 11.5 COMPRESSION RATIO ADVISED. BASIC RPM 3000-6500
Engine Size Configuration
396-454 C.I. V

Valve Setting: Intake .020 Exhaust .020 HOT

Lift: Intake @Cam 350 @Valve 595 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 362 @Valve 615
Rocker Arm Ratio 1.7

Cam Timing: TAPPET @.015
Lift: Opens Closes ADV Duration
Intake 37 BTDC 71 ABDC 288 °
Exhaust 85 BBDC 31 ATDC 296 °

Spring Requirements: Triple Dual Outer Inner
Part Number 99876
Loads Closed 190 LBS @ 1.950 or 1 61/64
Open 447 LBS @ 1.380
Recommended RPM range with matching components
Minimum RPM 2800
Maximum RPM 6600
Valve Float 7200

Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 12 BTDC 46 ABDC 107 238 °
Exhaust 60 BBDC 6 ATDC 117 246 °

Should I use the ones the manufactorur recomends?
Can I choose any other brand of spring to this camshaft? If so, which other should I go for?

Thanks for any help :)
 

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Premium Member
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2,709 Posts
I just checked the Crane catalog and the # 99876 is the recommended spring for that cam,its a dual spring with a dampener,manufacturers usually know what spring works with each cam and Crane has been doing it for quite a while.I'm sure there's lots of other manufacturers springs that will work,but you'll probably be OK with those ones.
Guy
 

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Premium Member
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113 Posts
Discussion Starter · #4 ·
Can I use this springs on that camshaft?

crancams 927-16
1.539 Nascar Valve Spring
Seat Load 197 @ 1.950
Open Load 543 @ 1.250
Coil Bind 1.175
Rate (Lbs./In.) 494
 

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Premium Member
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2,709 Posts
It probably wouldnt be a good idea to use second hand springs on your big block.Cars make for an expensive hobby I agree,but when it comes to valvetrain components you want to make absolutely certain you have matched parts.Use the manufacturers recommended springs and also its a good idea to check installed height and seat and open pressures.
Guy
 
G

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L88,

I ain't ragging on you, but rather pointing out kinda the way it is over here.

If we take a chance and we use different springs and a cam goes bad and TFB come's outta the cam manufacturer's mouth when we go back bitchin' about it..

Sorry, didn't mean to offend.

Have a nice day..

pdq67

PS., and here is how I compare springs.

First I need the spring rate which is just this;

Rate = lift pressure - seat pressure/seat height - lift height.

Then to find lift pressure you take seat pressure + (lift x rate)!

I hope this will help you to find what you can use and don't forget that you can use +/- .050" locks to vary seat height to raise or lower seat pressure as well as retainers also come in various heights and such.....

You just use the seat + the (.050" x rate) to get to changes in seat pressure here is all..........

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