- Engines & Components
- Piston
- SRP Pontiac 428/455 Flat Top Forged Pistons
Specs: Dome vol. -5cc, 497 grams
C/R: 70cc - 12.2:1; 75cc - 11.5:1; 85cc - 10.5:1; 111cc - 8.5:1. 1.480'' C/H, 6.625'' Rod, 4.210'' Stroke. 8/pkg.
What Are SRP Pontiac 428/455 Flat Top Forged Pistons Common Pros and Cons?
SRP Pontiac 428 and 455 flat top and forged pistons are ideal for street and mild race use. The forged design, when used with larger combustion chambers to keep compression down allows use with many boosted and nitrous applications. The flat top option helps increase compression in smaller combustion chamber cylinder heads. Because these pistons are forged, they are more expensive than lower quality cast or hypereutectic pistons.
Which SRP Pontiac 428/455 Flat Top Forged Pistons Are Best?
There is only one option for Pontiac 428 and 455 pistons in the flat top and forged line from SRP. This piston has a bore size of 4.185" for use with a 4.210" stroke crankshaft and 6.625" long connecting rods. This is close to matching a Pontiac 455 engine, which has the same stroke, but with a 4.151 stock bore. Factory Pontiac 428 pistons had a stock bore of 4.120 to match the 4.00 inch crankshaft stroke.
How Much Do SRP Pontiac 428/455 Flat Top Forged Pistons Cost?
A set of SRP Pontiac 428/455 flat top forged pistons can be had for just over $600 and include wrist pins.