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13° ALL PRO® / 13.5° GB2000 DOME

These pistons have been improved for 2009 to provide additional strength in critical areas with no increase in weight. Ideal for Sprint Cars or Dirt Late Models, the deeper valve reliefs (.320" int, .260" exh) now accommodate bigger cams and smaller chambers. Precision CNC-machined ring grooves now accept 1.2, 1.5, 3.0mm rings for reduced friction, while Lateral Gas Ports have been added for improved ring seal. Pin upgrade to 927-2750-17-93S recommended for applications over 700HP. This new configuration outperforms the competition hands down!

Includes:
Pin #927-2750-15-51S (130g)
Lateral Gas Ports with Accumulator Grooves
Double spiro locks (#927-042-CS)
Double pin oilers
400 ALL PRO SERIES
Std Bore: 4.125
Ring package designed for: 1.2, 1.5, 3.0mm Rings

Click here to see matching JE Pro Seal Head Gaskets!

Tech and Installation Tips
Valve Relief Diagram
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
40cc 45cc 50cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
281793 406 4.125 3.800 6.000 9.000 1.100 16.4 15.1 14.0 -4.5 444 S,B STD J75008-4125-5
281797 406 4.125 3.800 5.850 9.000 1.250 16.4 15.1 14.0 -4.5 473 S STD J75008-4125-5
281798 407 4.130 3.800 5.850 9.000 1.250 16.5 15.2 14.0 -4.5 478 S 0.005 J75008-4130-5
281794 407 4.130 3.800 6.000 9.000 1.100 16.5 15.2 14.0 -4.5 446 S,B 0.005 J75008-4130-5
281795 408 4.135 3.800 6.000 9.000 1.100 16.5 15.2 14.1 -4.5 449 S,B 0.010 J75008-4135-5
281799 408 4.135 3.800 5.850 9.000 1.250 16.5 15.2 14.1 -4.5 480 S 0.010 J75008-4135-5
281800 409 4.140 3.800 5.850 9.000 1.250 16.5 15.2 14.1 -4.5 480 S 0.015 J75008-4135-5
281796 409 4.140 3.800 6.000 9.000 1.100 16.5 15.2 14.1 -4.5 478 S,B 0.015 J75008-4135-5

- 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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