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LS1/LS2/LS3/LS6/LS9 F.S.R. (Inverted Dome)

Our FSR (Forged Side Relief) forging design allows the use of the most popular stroke and rod combinations while eliminating reluctor wheel clearence problems. Lightweight and extremely durable, these pistons are machined for 1.5, 1.5, 3mm rings and have an inverted dome designed to achieve optimum compression ratio with forced induction applications (CR calculated with .042 gasket thickness and 0.00" deck clearence).

Includes:
Pin #927-2250-15-51C (111g)
Wire locks #927-073-MW
350 Series
Std Bore: 3.900"-5.7L, 4.000"-6.0L
Ring package designed for: 1.5, 1.5, 3MM Rings
Tech and Installation Tips
Valve Relief Diagram
Part # CID Bore Stroke Rod
Lgth.		 Block
Ht.		 Comp.
Ht.
Head Cubic Centimeters
64cc 66cc 72cc
Compression Ratio
Dome
Vol.		 Gram
Wt.		 Footnote Oversize Recom.
Ring Set
264041 383 3.905 4.000 6.125 9.240 1.115 10.5 10.3 9.7 -10.0 382 B, C 0.005 J68008-3900-3
264042 403 4.005 4.000 6.125 9.240 1.115 11.0 10.7 10.1 -10.0 407 B, C 0.030 J60008-4000-5
221176 408 4.030 4.000 6.125 9.240 1.115 9.2 9.0 8.6 -29.0 395 B, C 0.030 J60008-4030-5
264043 408 4.030 4.000 6.125 9.240 1.115 11.1 10.8 10.2 -10.0 418 B, C 0.030 J60008-4030-5
221178 414 4.060 4.000 6.125 9.240 1.115 9.3 9.1 8.7 -29.0 400 B, C 0.060 J60008-4060-5
290665 415 4.065 4.000 6.125 9.240 1.115 9.3 9.1 8.8 -29.0 403 B, C STD LS3 JG31F8-4070-0
290666 416 4.070 4.000 6.125 9.240 1.115 9.3 9.1 8.8 -29.0 405 B, C .005 LS3 JG31F8-4070-0
221180 427 4.125 4.000 6.125 9.240 1.115 9.5 9.3 8.9 -29.0 425 B, C STD LS7 J60008-4125-5

- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.

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