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Tour Series GP (Gas Ported)

Similar to the Ultra Light GP, this piston has undergone engineering changes to handle higher horsepower 4-barrel applications (approximately 650 hp) and angle milled heads. Both 350 and 400 series accept oversize valves (intake pocket is 2.255" and the exhaust pocket is 1.870") and long duration, tight lobe separation cams. The ring grooves are precision machined for .043, .043, 3mm back cut rings with lateral gas ports for superior ring seal.

Includes:
Lateral Gas Ports
Contact Reduction Grooves
Double Spiro Locks #927-042-CS
Double Pin Oilers
350 Series
Std Bore: 4.000
Ring package designed for: .043, .043, 3MM Rings
Tech and Installation Tips
Valve Relief Diagram
Part # CID Bore Stroke Rod
Lgth.		 Block
Ht.		 Comp.
Ht.
Head Cubic Centimeters
58cc 64cc 76cc
Compression Ratio
Dome
Vol.		 Gram
Wt.		 Footnote Oversize Recom.
Ring Set
170697 383 4.030 3.750 6.000 9.000 1.125 11.9 11.1 9.7 -5.0 385 0.030 J70008-4030-5
170698 385 4.040 3.750 6.000 9.000 1.125 11.9 11.1 9.7 -5.0 389 0.040 J70008-4040-5
170689 357 4.030 3.500 5.700 9.000 1.550 11.2 10.3 9.1 -5.0 439 A 0.030 J70008-4030-5
170692 357 4.030 3.500 6.000 9.000 1.250 11.2 10.3 9.1 -5.0 398 A 0.030 J70008-4030-5
170695 357 4.030 3.500 6.250 9.000 1.000 11.2 10.3 9.1 -5.0 370 A,B,M 0.030 J70008-4030-5
170697 357 4.030 3.500 6.125 9.000 1.125 11.2 10.3 9.1 -5.0 385 A 0.030 J70008-4030-5
170698 358 4.040 3.500 6.125 9.000 1.125 11.2 10.3 9.1 -5.0 389 A 0.040 J70008-4040-5
170696 358 4.040 3.500 6.250 9.000 1.000 11.2 10.3 9.1 -5.0 374 A,B,M 0.040 J70008-4040-5
170693 359 4.040 3.500 6.000 9.000 1.250 11.2 10.3 9.1 -5.0 401 A 0.040 J70008-4040-5
170690 359 4.040 3.500 5.700 9.000 1.550 11.2 10.3 9.1 -5.0 442 A 0.040 J70008-4040-5
170691 362 4.060 3.500 5.700 9.000 1.550 11.2 10.3 9.1 -5.0 453 A 0.060 J70008-4060-5
170694 362 4.060 3.500 6.000 9.000 1.250 11.2 10.3 9.1 -5.0 410 A 0.060 J70008-4060-5


400 Series
Std Bore: 4.125
Ring package designed for: .043, .043, 3MM Rings
Part # CID Bore Stroke Rod
Lgth.		 Block
Ht.		 Comp.
Ht.
Head Cubic Centimeters
58cc 64cc 76cc
Compression Ratio
Dome
Vol.		 Gram
Wt.		 Footnote Oversize Recom.
Ring Set
181933 407 4.155 3.750 6.000 9.000 1.125 12.5 11.6 10.2 -5.0 424 0.030 J70008-4155-5
181933 380 4.155 3.500 6.125 9.000 1.125 11.7 10.9 9.6 -5.0 424 A 0.030 J70008-4155-5

- 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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