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400 SMALL BLOCK GP (GAS PORTED) 18º DOME

The same design as the Small Block 18º dome pistons, but equipped with lateral gas ports and machined for our new Pro Steel rings with 1.2, 1.5, 3mm axial thickness and backcut radial widths. Will not fit Brodix 18x cylinder heads.

Includes:
Pin #927-2750-15-51S (130g)
Single Spiro locks #927-073-AS
Lateral Gas Ports
Double Pin Oilers
18º GP SERIES
Std Bore: 4.125
Ring package designed for: 1.2, 1.5 3MM Rings
1.000" Compression height pistons not intended for nitrous use.

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
50cc 54cc 58cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
218595 428 4.125 4.000 6.000 9.000 1.000 15.9 15.2 14.5 2.5 444 S,B,M STD J75008-4125-5
218594 414 4.125 3.875 6.000 9.000 1.062 15.4 14.7 14.1 2.5 454 S,B STD J75008-4125-5
218592 406 4.125 3.800 6.000 9.000 1.100 15.1 14.5 13.8 2.5 464 S,B,M STD J75008-4125-5
218593 401 4.125 3.750 6.000 9.000 1.125 14.9 14.3 13.7 2.5 466 S,B,M STD J75008-4125-5

- 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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