Page 595 - 2022-23 Auto Performance Drag Racing

Forged Pistons
DRAG RACING
Manufactured by Wiseco, ProTru forged pistons are affordable with features usually found only in more expensive pistons. Pistons are machined for 1/16" top, 1/16" second, and 3/16" rings. Kits include eight pistons, chrome moly wrist pins, and a full set of spiral locks. Piston rings must be purchased separately.
Street Series Forged Pistons
Part No. Bore Stroke Rod Length Comp. Ht. Comp. Ratio Part No. Bore Stroke Rod Length Comp. Ht. Comp. Ratio
American Motors 360
WPTPTS539A3
4.110"
3.440"
5.875"
1.590"
11.2:1
SB Chevy 350 23° Hollow Dome
WPTPTS502A3
4.030”
3.480”
5.700”
1.560”
12.0:1
WPTPTS502A4
4.040”
3.480”
5.700”
1.560”
12.2:1
WPTPTS502A6
4.060”
3.480”
5.700”
1.560”
12.2:1
SB Chevy 350 23° Flat Top (2-Valve Pockets)
WPTPTS503A3
4.030”
3.480”
5.700”
1.560”
9.8:1
WPTPTS503A6
4.060”
3.480”
5.700”
1.560”
10.0:1
WPTPTS504A3
4.030”
3.750”
5.700”
1.425”
10.5:1
WPTPTS504A6
4.060”
3.750”
5.700”
1.425”
10.7:1
WPTPTS505A3
4.030”
3.480”
6.000”
1.260”
9.8:1
WPTPTS505A6
4.060”
3.480”
6.000”
1.260”
10.0:1
WPTPTS506A3
4.030”
3.750”
6.000”
1.125”
10.5:1
WPTPTS506A4
4.040”
3.750”
6.000”
1.125”
10.5:1
WPTPTS506A6
4.060”
3.750”
6.000”
1.125”
10.5:1
SB Chevy 350 23° Reverse Dome
WPTPTS508A3
4.030”
3.480”
5.700”
1.560”
9.6:1
WPTPTS508A6
4.060”
3.480”
5.700”
1.560”
9.8:1
WPTPTS509A6
4.060”
3.480”
6.000”
1.260”
9.8:1
SB Chevy 400 23° Flat Top (2-Valve Pockets)
WPTPTS507A3
4.155”
3.480”
5.700”
1.560”
11.6:1
WPTPTS510A3
4.155”
3.750”
5.700”
1.425”
11.6:1
WPTPTS510A4
4.165”
3.750”
5.700”
1.425”
11.6:1
WPTPTS525A3
4.155"
3.750"
6.000"
1.125"
11.6:1
SB Chevy 400 23° Hollow Dome
WPTPTS535AS
4.125”
3.750”
6.000”
1.125”
13.3:1
WPTPTS535A4
4.165”
3.750”
6.000”
1.125”
13.6:1
SB Chevy Gen. III LS1
WPTPTS523A903
3.903"
3.622"
6.098"
1.335"
10.7:1
Big Block Chevy 427 Closed Chamber Domed
WPTPTS520A3
4.280"
3.766"
6.135"
1.760"
10.2:1
Big Block Chevy 454 Open Chamber Dome
WPTPTS522A3
4.280"
4.250"
6.385"
1.270"
10.5:1
Big Block Chevy 454 Open Chamber Hollow Dome
WPTPTS514A3
4.280"
4.000"
6.135"
1.645"
9.9:1
BB Chevy 454 Open Chamber Hollow Dome
WPTPTS514A6
4.310”
4.000”
6.135”
1.645”
10.0:1
BB Chrysler 440
WPTPTS531A3
4.350"
3.750"
6.760"
2.050"
9.9:1
Note: SB Chevy compression ratios are based upon 64cc combustion chamber volume. Big block Chevy 454 open chamber compression ratio is based on a 112cc combustion chamber and .020" deck height. Big block Chevy 427 closed chamber compression ratio is based on a 107cc combustion chamber and .020" deck height. AMC 360 compression ratio is based on a 58cc combustion chamber. SB Chevy Gen. III LS1 compression ratio is based on a 67cc combustion chamber. BB Chrysler compression ratio is based on a 88cc combustion chamber.
NEW VENDOR
Pro Sport SFI-Approved Harmonic Balancers
Pro Race offers a full line of precision manufactured, SFI-approved Pro Sport harmonic balancers that are spin tested to 12,500 RPM. Manufactured from premium high-carbon steel, each balancer includes a retained outer intertia ring and 60° of permanently engraved timing marks.
Part No. Application Dia. Balance Weight
Harmonic Balancer Counterweights
May be added to convert internal balance models to external balance. Sold complete with required fastener(s).
Part No. Description
PRH31262
Small Block Chevy 265-350
6.10"
Internal
5.4 lbs.
PRH32068
Dodge 5.7L Gen. III Hemi, 20% Underdrive
7.63"
Internal
9 lbs.
PRH32560
Camaro/Firebird LS1; GTO LS2, 25% Underdrive
11.07"
Internal
13 lbs.
PRH32561
Corvette LS1/LS2/LS3; G8 LS3/L98, 25% Underdrive
11.76"
Internal
12.7 lbs.
PRH34260
Camaro/Firebird LS1; GTO LS2
7.52"
Internal
12.7 lbs.
PRH34261
Corvette LS1/LS2/LS6; G8 LS3
7.52"
Internal
13.3 lbs.
PRH34262
Small Block Chevy 265-350
6.61"
Internal
10.1 lbs.
PRH34263
Big Block Chevy 396-427
7.01"
Internal
12.7 lbs.
PRH34264
Big Block Chevy 454
7.01"
External
14.1 lbs.
PRH34265
Small Block Chevy 265-350
6.61"
Internal
10.1 lbs.
PRH34266
Small Block Chevy 400
6.61"
External
11.2 lbs.
PRH34269
Small Block Ford 289-351W, 28 oz./In.
6.61"
External
11.0 lbs.
PRH34270
Small Block Ford 5.0L (302), 1981-Up, 50 oz./In.
6.61"
External
11.8 lbs.
PRH34272
Big Block Ford 429-460
6.61"
Int./Ext.
9.9 lbs.
PRH34277
Small Block Chrysler 273-360
7.01"
Internal
11.1 lbs.
PRH34278
Small Block Chrysler 318-360
7.01"
External
11.9 lbs.
PRH34279
Big Block Chrysler 383-440, 426 Hemi
7.01"
Internal
10.8 lbs.
PRH64275
Pontiac 350-455
6.61"
Internal
9.8 lbs.
PRH64276
Oldsmobile 350-455
6.61"
External
11.1 lbs.
PRH35264
Big Block Chevy, Fits PRH34263
PRH35266
Small Block Chevy, Fits PRH34265/PRH34266
PRH35269
Small Block Ford 289-351W, 28 oz./In., Fits PRH34269/PRH34270
PRH35278
Small Block Chrysler, Fits PRH34277/PRH34278
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2022-23