Cylinder Head - 18-4504 - Sierra

Cylinder Head - 18-4504 - Sierra
Your Price: $3,297.71
Save: $554.56
(14% Off $3,852.27)
Part # 18-4504
SHIPS TOMORROW!* if ordered in 19 hrs 7 mins.
Hurry! Only 1 left in stock
No Reviews  |  Write Review  |  Ask Question
This item is found in the following Product Families

Mercruiser Cylinder Head Assemblies
Mercruiser Cylinder Head Assemblies
Cylinder head assemblies from Sierra for Mercruiser Engines.

  • Aluminum cylinder heads sold in pairs only or 454 & 502 cu.In big-block GM applications.
  • Custom engraved with Sierra High-Performance logo
  • 320 cc intake runner/119cc exhaust runner
  • 2.25 intake/1.88 exhaust stainless steel valves
  • 5 angle valve seat cut
  • Up to 65HP increase over OE cylinder heads
  • Suitable for use on Mark IV, Gen V, & Gen VI GM blocks. Must use correct corresponding head gaskets
  • Std. BBC 7/16" rocker studs and 3/8" diameter pushrod guideplates
  • Rectangle intake ports
  • Use on factory non-adjustable valvetrain applications require adjustable rocker arm assemblies such as Sierra's 18-4507
  • Use Sierra 18-4506 guide plates to utilize factory 5/16" pushrods
Ask a question for
Question & Answer Guidelines
This product ships in 1 business day.
Add to Cart and enter your Postal Code to determine the shipping charges and estimated delivery date.
Most products and orders leave our warehouse in 1 business day. However, select items may take more processing time. Alaska and Hawaii orders please add 1 additional warehouse processing day.
Standard Shipping Policies
Do you need Professional Installation? has teamed with a national network of independent installers that are ready to handle your installation needs.
Find your local Amtech dealer: