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15º LS1

We have redesigned and expanded our GM LS1 series product lines! These new pistons utilized our dedicated Forged Side Relief (FSR) forging that was specifically designed for the demands of the GM LS1 series of engines. In addition we have found ways to reduce weight and maintain the durability needed for both street and racing use. (CR calculated with .051" gasket thickness and +.009-.011" deck clearance). Lightweight and extremely durable, these pistons are machined for 1.5mm, 1.5mm, 3.0mm rings.

Includes:
927-2250-15-51C (106g) wrist pins included, note C
945-2200-15-51C (105g) wrist pins included, note K
Wire locks included, #945-073-MW
LS1 Series - FSR Series
Std Bore: 3.898
FSR Series Uses 2.250 length pins 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
321247 382 3.898 4.000 6.200 9.250 1.050 11.5 11.2 10.5 -2.0 405 C,M STD JG6008-3905
321248 383 3.905 4.000 6.200 9.250 1.050 11.5 11.2 10.5 -2.0 407 C,M .007 JG6008-3905
321245 372 3.898 3.900 6.125 9.250 1.175 11.2 10.9 10.2 -2.0 421 C,M STD JG6008-3905
321246 374 3.905 3.900 6.125 9.250 1.175 11.2 11.0 10.2 -2.0 423 C,M .007 JG6008-3905
321241 346 3.898 3.622 6.125 9.251 1.315 8.7 8.5 8.0 -19.9 Call C STD JG6008-3905
321237 346 3.898 3.622 6.098 9.249 1.340 8.7 8.5 8.0 -19.5 419 K STD JG6008-3905
321239 346 3.898 3.622 6.098 9.249 1.340 10.4 10.2 9.6 -2.0 439 K STD JG6008-3905
321243 346 3.898 3.622 6.125 9.251 1.315 10.5 10.2 9.6 -2.0 432 C STD JG6008-3905
321238 347 3.905 3.622 6.098 9.249 1.340 8.7 8.5 8.0 -21.8 421 K .007 JG6008-3905
321242 347 3.905 3.622 6.125 9.251 1.315 8.7 8.5 8.0 -20.2 Call C .007 JG6008-3905
321244 347 3.905 3.622 6.125 9.251 1.315 10.5 10.3 9.6 -2.0 434 C .007 JG6008-3905
321240 347 3.905 3.622 6.098 9.249 1.340 10.4 10.2 9.6 -2.0 439 K .007 JG6008-3905


LS1 Series - Full Round Series
Std Bore: 3.899
Full Round Series Uses 2.500 length pins 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
194881 383 3.905 4.000 6.200 9.250 1.050 11.5 11.3 10.5 -2.0 390 B,C 0.007 J68008-3900-3
194882 373 3.905 3.900 6.125 9.250 1.175 11.3 11.0 10.3 -2.0 410 C, M 0.007 J68008-3900-3
194883 347 3.905 3.622 6.125 9.251 1.315 10.6 10.3 9.6 -2.0 428 C 0.007 J68008-3900-3
194884 347 3.905 3.622 6.098 9.249 1.340 10.6 10.3 9.6 -2.0 434 K 0.007 J68008-3900-3

- 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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