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Cast iron Vortec cylinder heads - Marine grade

Cast iron Vortec cylinder heads - Marine grade

SKU SBC-CR-VORTEC
8.799,20 DKK
In stock: 1 available
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Cast iron Vortec cylinder heads - Marine grade
Product Details
Weight: 44,00 kg

Vortec cast iron cylinder heads 906 for MerCruiser 5.7, Volvo penta 5.7 or OMC 5.7


  • Quality intake valves in steel from American Engine pro. Head diameter 1.94” w/45 degree seat. Valve stem diameter 0.3415”.
  • Quality steel exhaust valves from American Engine pro. Head diameter 1,500” w/45 degree seat. Valve stem diameter 0.3415”
  • 1,250" Engine pro street / race valve springs. 100 lbs in open pressure at 1,710" and 265 lbs at 1.25". Max valve lift 0.45"
  • Valve spring retainers in 4140 chromoly steel, which is hardened from American Engine Pro.
  • Engine pro 7 degree valve locks in hardened steel
  • Engine pro Viton oil thieves
  • Valve spring shims in 4140 Chromemoly
  • 170cc Intake duct
  • 61cc exhaust duct
  • 64cc Combustion chambers.
  • Fitted with hardened steel valve seats for unleaded petrol.
  • Valve angle 23 degrees
Price is for a set of 2! (can be sold seperately)
Option to upgrade to Manley stainless valves for additional cost.


Replaces the following part numbers

MerCruiser #938-803860T (8 bolt intake manifold)

MerCruiser #938-883490R1 (12 bolt intake manifold)

MerCruiser #883490R1 & 803860T

GTIN 745061478459

GM Performance P/N # 12691728

Volvo Penta #3856929

Sierra #18-4486

Crusader #R003008B


Can only be used for the following camshafts:

Mercury - Mercruiser Part no. 431-5943 / GM Part no. 340284. - Non Roller camshaft.
Mercury - Mercruiser Part no. 431-811658. - Roller camshaft.
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