Click to enlargeChevy 400 Forged Pistons

SRP 138097 Chevrolet small block 400 forged flat top pistons.

.030 over size for a 4.155 bore size.

Provides 407 cubic inches displacement.

Works with a stock stroke of 3.750 and the rod length of 5.7".

TECH NOTE: Standard bore size is 4.125 and standard stroke is 3.750.

Sold as a set of 8 forged flat top pistons with wrist pins and spiro locks.

Compression height is 1.425 and dome volume is -.5cc.

Each piston weights in at 501 grams.

CNC machined ring grooves accept 1/16, 1/16, and 3/16 rings.

Includes wrist pins that measure .927 by 2.750 by 150 wall thickness.

Double spiro locks are also included.

Provides 12.5 compression with 58cc chamber cylinder heads.

Provides 11.6 compression with 64cc chamber cylinder heads.

Provides 10.8 compression with 70cc chamber cylinder heads.

Made of 4032 wrought aluminum alloy.

Designed for street and strip applications utilizing compression ratios that are compatible with pump gas.

These pistons also provide a quieter engine on cold start-up.

Features symetrical valve pockets fully radiused.

Honed pin bore, forged side relief.

Full floating wrist pin.

Double spiro locks.

Machined oil drain back holes (not slotted).

Pressure fed pin oilers.

SRP pistons are forged from wrought alluminum alloys.

Wrought aluminum is 20% stronger than aluminum bar stock and 50% stronger than cast aluminum pistons.

SRP uses only the highest grade wrought aluminum alloys to make a stronger, lighter piston.

These aerospace quality alloys have been rigourously tested and found to be the most durable material for this application.

To optimize the weight of the piston, application specific forgings are designed in 3D computer modeling programs.

This makes it possible to have consistent dome thickness which will not compromise the durability of the piston.

All SRP pistons feature fully CNC machined domes, dishes and valve reliefs to give you precise compression ratios and consistent weights.

All SRP pistons incorporate CNC diamond turned skirts to provide you with a better, more consistent finish, and have CNC honed pin bores and are thoroughly deburred prior to cleaning and packaging so no prep work is required.

SRP pistons are ready to run right out of the box.

IMPORTANT NOTE: Please be sure of your engine's overbore size (.030, .040, etc) before ordering. One size does not fit all!


SRP 138097 Chevy 400 small block flat top pistons .030 over sized SRP-138097$525.97
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