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Articles and Publications |
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| · Tech Tips · Reference Material · | 01.19.2007 |
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A & LA Small Block Valvesprings
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| "A" Engine Valve Springs |
| Part Number |
Inst. Ht. |
Description |
O.D. |
Wire Dia. |
Lift Range |
Material |
Retainer |
| *P4286813 |
1.65"/1.70" |
Single/damper |
1.39" |
.185" |
.390"/.450" |
Chrome-van |
P4452033/P4286573 |
| *P4120249 |
1.67"/1.70" |
Single/damper |
1.50" |
.206" |
.430"/.500" |
Chrome-van |
P4452033 |
| *P5249847 |
1.68"/1.70" |
Single/damper |
1.50" |
.207" |
.480"/.535" |
Chrome-sil |
P4452033 |
| *P3614542 |
1.67"/1.70" |
Dual/damper |
1.45" |
.185" |
.500"/.610" |
Chrome-sil |
P4452033/P4286573 |
| *P3412068 |
1.68"/1.70" |
Dual/damper |
1.46" |
.191" |
.520"/.620" |
Special |
P4452033 |
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See the Engine Book P5249704 for spring pressures
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| "A" Engine Valve Springs (Long Valves) |
| Part Number |
Inst. Ht. |
Description |
O.D. |
Wire Dia. |
Lift Range |
Material |
Retainer |
| *P3690933 |
1.83"/1.86" |
Single/damper |
1.53" |
.224" |
.440"/.500" |
Chrome-van |
P4452033/P4286573 |
| *P5249848 |
1.86"/1.87" |
Single/damper |
1.55" |
.216" |
.480"/.540" |
Chrome-sil |
P4452033/P4286573/P4007178 |
| *P2806077 |
1.83"/1.86" |
Dual/damper |
1.52" |
.215" |
.500"/.610" |
Chrome-van |
P4529823/P4007178 |
| *P4876064 |
1.86"/1.88" |
Dual/damper |
1.60" |
.216" |
.590"/.640" |
Chrome-sil |
P4286573/P4007178 |
| *P5249864 |
2.00"/2.02" |
Single/damper |
1.55" |
.216" |
.460"/.550" |
Chrome-sil |
P4452033/P4286573 |
| *P2946353 |
1.99"/2.00" |
Dual/damper |
1.59" |
.224" |
.520"/.700" |
Special |
P4286573/P4007178/P4120785 |
| *P5249849 |
2.00"/2.02" |
Dual/damper |
1.55" |
.216" |
.650"/.750" |
Chrome-sil |
P4286573/P4007178/P4120785 |
| *P4007536 |
2.00"/2.02" |
Triple |
1.62" |
— |
.640"/.745" |
Chrome-sil |
P4120783/P4286775 |
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See the Engine Book P5249704 for spring pressures
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Notes:
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Chrome-van stands for chrome-vanadium; chrome-sil for chrome silicon.
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All valve springs are sold individually.
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On W7 heads and others with x-long valves, like the 5.40" length, the typical installed spring height is 2.00", so only the springs listed above for the 1.99" thru 2.02" installed heights can be used.
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With a single spring, the damper is installed inside the main spring; with a dual spring, the damper is installed between the inner and outer springs. There are no dampers in the triple springs.
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Retainers - the ones listed are the basic recommendation. Check the actual retainer listing for other options - added installed height, materials, lock size.
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*Not legal for sale or use on pollution-controlled motor vehicles.
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