Pro1 BBC 275 Oval Port Heads with 110cc Chambers Offered By Dart

You love the Pro1 275 Oval Port Cylinder Heads for Chevy Big Block engines from Dart and now you can get those same great heads with 110cc chambers. This means more compression ratio and build possibilities than ever! And of course, each head is constructed from the highest-quality materials, giving you a great cylinder head for your money.

Official Release:

Pro1 BBC 275 Oval Port Cylinder Heads with 110cc Chambers

Our popular Pro1 275 oval port heads for big block Chevy engines are now available with an option for smaller, 110cc combustion chambers. The new smaller chamber makes higher compression ratios possible and expands the build possibilities for an already great head.

Inspired by our championship winning Pro Stock designs, the Pro 1’s race proven features include rolled valve angles, improved spark plug location, extra long intake valves, raised exhaust ports and fast burn chambers – Yet the Pro 1 can be used with off the shelf pistons, valve train components and intake manifolds.


  • Premium alloy: Dart aluminum heads are cast from virgin 355-T61 aerospace alloy for superior strength and integrity.
  • Bolt on compatibility: 2 degree rolled valve angle and standard spacing. Accommodates all stock accessories.
  • Heart shaped 121cc chambers improve combustion efficiency.
  • Raised spark plug location improves flame travel for a quicker, more complete burn, producing more power.
  • Multi-angle intake seats and radiused exhaust seats dramatically increase airflow.
  • Hardened exhaust seats are compatible with unleaded gasoline.
  • Exhaust ports raised .300″ to improve flow (requires 1″ longer head bolts next to exhaust ports).
  • Spark plug holes are machined for gasketed 3/4″ reach plugs.
  • Manganese bronze valve guides extend cylinder head life and reduce stem wear.
  • All cylinder heads are sold individually.

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About the author

Lindsey Fisher

Lindsey is a freelance writer and lover of anything with a rumble. Hot rods, muscle cars, motorcycles - she's owned and driven it all. When she's not busy writing about them, she's out in her garage wrenching away. Who doesn't love a tech-savy gal that knows her way around a garage?
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