Race Ready Fully Assembled Heads 5x13 (Marine)
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5" SYMMETRICAL FOR MARINE APPLICATIONS. At Sonny's all head porting is done in-house. We use a state of the art 5 axis CNC vertical machining center, which can produce precision work to programmed "blue print" specs. This unique cylinder head was designed by Sonny's for 500 + cu. in. engines. The intake runners are symmetrical and feature all good runners (runners that direct towards the middle of the cylinder). We offer the heads with Ductile seats and Ampco 45 replaceable drive-in step guides. These cylinder heads is to accommodate 5.000" bore center applications, like IHRA Pro-Stock and Pro-Mod, Pro-Street cars, Tractor and Truck pullers, and Unlimited Marine/Boat engines. Blocks and cranks can be purchased from Sonny's to make-up with this ultimate performance cylinder head.

Price: 9875.00 pr.
✷ Call 434-239-1009 or Contact Us


  • 4.670" bore chamber 84 cc
  • Intake valve 2.520"
  • Exhaust valve 1.900"
  • Intake flow 556 cfm @ .800", 536 cfm @ .700"
  • Exhaust flow 381 cfm @ .800", 366 cfm @ .700"
  • Intake runner volume 547 cc
  • Exhaust runner volume 221 cc
  • Intake valve angles 5 degree cant x 13 degree incline (rollover)
  • Actual intake square in. 1.90 x 2.53 = 4.80 - 3/4R = 4.32 Marine


Race Ready Fully Assembled Heads 5x16 (Marine) $9,430.00
For questions or additional information, call 434-239-1009 or Contact Us