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400 FLAT TOP PROFESSIONAL SERIES

    PISTON DESIGN
  • Advanced, lightweight FSR forging that eliminates stress concentrations for superior strength
  • Up to 20% lighter than traditional equivalent
  • High-silicon 4032 aluminum alloy for reduced piston-to-wall clearance and quiet operation
  • Accumulator grooves for improved ring seal
  • Designed for normally aspirated or moderate forced induction/nitrous applications
  • Now includes high performance skirt coating!
    RINGS INCLUDED
  • Lightweight, low friction metric ring package included
  • 1.2mm top ring, 1.5mm 2nd ring, 3.0mm standard tension oil ring
  • Minimal filing required

    PINS AND LOCKS
  • High quality 2.250" pin further reduces reciprocating weight
  • Carbon steel wire locks included
400 FLAT TOP PROFESSIONAL SERIES


Click here to see matching JE Pro Seal Head Gaskets!
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
58cc 64cc 70cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
295444 428 4.125 4.000 6.000 9.000 1.000 13.1 12.2 11.4 -5 378 B STD JG31F8-4125-2
329437 429 4.130 4.000 6.000 9.000 1.000 13.1 12.2 11.4 -5 380 B .005 JG31F8-4135-2
329438 430 4.135 4.000 6.000 9.000 1.000 13.1 12.2 11.4 -5 382 B .010 JG31F8-4135-2
271063 434 4.155 4.000 6.000 9.000 1.000 13.3 12.3 11.5 -5 383 B 0.030
295445 414 4.125 3.875 6.000 9.000 1.062 12.7 11.8 11.1 -5 390 B STD JG31F8-4125-2
329439 415 4.130 3.875 6.000 9.000 1.062 12.7 11.8 11.0 -5 392 B .005 JG31F8-4135-2
329440 416 4.135 3.875 6.000 9.000 1.062 12.8 11.9 11.1 -5 394 B .010 JG31F8-4135-2
271064 421 4.155 3.875 6.000 9.000 1.062 12.9 12.0 11.2 -5 395 B 0.030
295447 400 4.125 3.750 6.000 9.000 1.125 12.3 11.5 10.7 -5 399 B STD JG31F8-4125-2
329441 402 4.130 3.750 6.000 9.000 1.125 12.3 11.5 10.7 -5 401 B .005 JG31F8-4135-2
329442 403 4.135 3.750 6.000 9.000 1.125 12.4 11.5 10.8 -5 404 B .010 JG31F8-4135-2
271065 406 4.155 3.750 6.000 9.000 1.125 12.5 11.6 10.9 -5 405 B 0.030
309948 374 4.125 3.500 6.000 9.000 1.250 11.6 10.8 10.1 -5 415 A STD JG31F8-4125-2
309948 380 4.125 3.500 6.000 9.000 1.250 11.7 10.9 10.2 -5 425 A .030 JG31F8-4155-3
309948 372 4.125 3.480 6.000 8.990 1.250 11.5 10.7 10.0 -5 415 A STD JG31F8-4125-2
329443 373 4.130 3.480 6.000 8.990 1.250 11.5 10.7 10.0 -5 418 A .005 JG31F8-4135-2
329444 374 4.135 3.480 6.000 8.990 1.250 11.5 10.7 10.0 -5 420 A .010 JG31F8-4135-2
309949 377 4.155 3.480 6.000 8.990 1.250 11.6 10.8 10.1 -5 425 A .030 JG31F8-4155-3
271063 377 4.155 3.480 6.250 8.990 1.000 11.7 10.8 10.1 -5 383 A,B 0.030
271065 377 4.155 3.480 6.125 8.990 1.125 11.7 10.8 10.1 -5 405 A,B 0.030

- 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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