Piston Top Aprox. Comp. Ratio:
-7cc Flat Top Pontiac Early and Late
Chamber | Comp Ratio |
---|
62 | 9.9 to 1 |
87 | 7.69 to 1 |
124 | 5.9 to 1 |
For accurate Comp Ratio info use the calculator below.
Engine Brand: Pontiac
Engine Family: Pontiac Early and Late
Engine Size: 326
Cylinder Bore Size: 3.750 in , 95.175 mm
Ring Groove Width: 1.2/1.2/3MM
Compression Height: 1.710"
Pin Diameter: 0.980"
Connecting Rod Length: 6.625"
Crankshaft Stroke: 3.750"
Cylinder Head: Pontiac Early and Late
TDC Assembly Height: 10.210" ( Zero Deck Height )
Download Piston Instructions
Features: |
Piston Series |
|
E series
|
SX series |
1-FX series |
2-FX series |
3-FX series |
Broached pin oiling slots |
x
|
x
|
|
|
|
Drilled, forced wrist pin oiling |
|
x
|
x
|
x
|
x
|
Forged drain-back windows |
x
|
|
|
|
|
Drilled bottom ring land intersecting oil groove drain-backs |
|
x
|
x
|
x
|
x
|
Slightly larger, deeper valve reliefs than OEM |
x
|
|
|
|
|
CNC machined valve reliefs for moderate performance heads and cam combinations |
|
x
|
|
|
|
Larger, deeper CNC valve reliefs for more aggressive cylinder head and cam combinations |
|
|
x
|
x
|
x
|
Premium Aircraft spec. 4032 low expansion alloy |
x
|
x
|
x
|
|
|
Premium Aircraft spec. 2618 alloy |
|
|
|
x
|
x
|
Blower, Turbo, NOS ready |
|
x
|
x
|
x
|
x
|
Brushed piston crown |
|
|
x
|
x
|
x
|
Turned dishs |
x
|
x
|
|
|
|
Max Quench milled dishs |
|
|
x
|
x
|
x
|
Additional CNC milling for weight reduction in non-critical areas |
|
|
x
|
x
|
x
|
Patented “X Groove” skirt for superior cylinder and ring life |
|
|
x
|
x
|
x
|
Thinner/shallower Ring grooves for maximum ring seal and land strength |
|
|
x
|
x
|
x
|
Low volume contact reduction grooves |
|
|
x
|
x
|
x
|
2nd ring land accumulator groove prevents ring flutter |
|
|
x
|
x
|
x
|
3rd ring land scraper relief |
|
|
x
|
x
|
x
|
Oil ring groove relief reservoir |
|
|
x
|
x
|
x
|
Inner and outer pin boss weight reduction radiusing |
|
|
x
|
x
|
x
|
Tighter control of crown thickness yields consistently lighter parts |
|
|
x
|
x
|
x
|
Dynamic skirt milling controls skirt thickness for consistently lighter parts |
|
|
x
|
x
|
x
|
Diamond-turned high strength skirts |
x
|
x
|
x
|
x
|
x
|
High-strength piston pins |
x
|
x
|
x
|
x
|
x
|
Extreme Duty XR wrist pins |
|
|
|
|
x
|
Horizontal Gas Ports enhance ring seal |
|
|
|
|
x
|
Forged and machined in the USA |
x
|
x
|
x
|
x
|
x
|
|
Piston Specs
Piston Top Aprox. Comp. Ratio:
-7cc Flat Top Pontiac Early and Late
Chamber | Comp Ratio |
---|
62 | 9.9 to 1 |
87 | 7.69 to 1 |
124 | 5.9 to 1 |
For accurate Comp Ratio info use the calculator below.
Engine Brand: Pontiac
Engine Family: Pontiac Early and Late
Engine Size: 326
Cylinder Bore Size: 3.750 in , 95.175 mm
Ring Groove Width: 1.2/1.2/3MM
Compression Height: 1.710"
Pin Diameter: 0.980"
Connecting Rod Length: 6.625"
Crankshaft Stroke: 3.750"
Cylinder Head: Pontiac Early and Late
TDC Assembly Height: 10.210" ( Zero Deck Height )
Download Piston Instructions
Piston Series Comparison Chart
Features: |
Piston Series |
|
E series
|
SX series |
1-FX series |
2-FX series |
3-FX series |
Broached pin oiling slots |
x
|
x
|
|
|
|
Drilled, forced wrist pin oiling |
|
x
|
x
|
x
|
x
|
Forged drain-back windows |
x
|
|
|
|
|
Drilled bottom ring land intersecting oil groove drain-backs |
|
x
|
x
|
x
|
x
|
Slightly larger, deeper valve reliefs than OEM |
x
|
|
|
|
|
CNC machined valve reliefs for moderate performance heads and cam combinations |
|
x
|
|
|
|
Larger, deeper CNC valve reliefs for more aggressive cylinder head and cam combinations |
|
|
x
|
x
|
x
|
Premium Aircraft spec. 4032 low expansion alloy |
x
|
x
|
x
|
|
|
Premium Aircraft spec. 2618 alloy |
|
|
|
x
|
x
|
Blower, Turbo, NOS ready |
|
x
|
x
|
x
|
x
|
Brushed piston crown |
|
|
x
|
x
|
x
|
Turned dishs |
x
|
x
|
|
|
|
Max Quench milled dishs |
|
|
x
|
x
|
x
|
Additional CNC milling for weight reduction in non-critical areas |
|
|
x
|
x
|
x
|
Patented “X Groove” skirt for superior cylinder and ring life |
|
|
x
|
x
|
x
|
Thinner/shallower Ring grooves for maximum ring seal and land strength |
|
|
x
|
x
|
x
|
Low volume contact reduction grooves |
|
|
x
|
x
|
x
|
2nd ring land accumulator groove prevents ring flutter |
|
|
x
|
x
|
x
|
3rd ring land scraper relief |
|
|
x
|
x
|
x
|
Oil ring groove relief reservoir |
|
|
x
|
x
|
x
|
Inner and outer pin boss weight reduction radiusing |
|
|
x
|
x
|
x
|
Tighter control of crown thickness yields consistently lighter parts |
|
|
x
|
x
|
x
|
Dynamic skirt milling controls skirt thickness for consistently lighter parts |
|
|
x
|
x
|
x
|
Diamond-turned high strength skirts |
x
|
x
|
x
|
x
|
x
|
High-strength piston pins |
x
|
x
|
x
|
x
|
x
|
Extreme Duty XR wrist pins |
|
|
|
|
x
|
Horizontal Gas Ports enhance ring seal |
|
|
|
|
x
|
Forged and machined in the USA |
x
|
x
|
x
|
x
|
x
|
|
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