- Engines & Components
- Engine Blocks
- World Products Big Block Chevy Merlin IV Cast Iron Engine Blocks
Modern Advancements for a Superior Big Block Chevy
World Products has redesigned the famed Merlin Big Block Chevy casting, incorporating numerous improvements and new features, designated the Merlin IV. New features include thicker main webs and thicker cylinder walls for increased strength and durability. The Merlin IV also has an increased volume priority main oiling system with a front oil feed for dry sump systems and front oil cross over with restrictor provisions to provide racing engines with oil where they need it the most.
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4.245 in. Cylinder Bore
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.245 in. Bore 9.800 in. Deck Height Standard Cam Journal & Lifter Bore Billet Splayed Main Caps
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$4,645.49
Estimated to ship direct from manufacturer in 24hrs
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Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.245 in. Bore 10.200 in. Deck Height Standard Cam Journal & Lifter Bore Billet Splayed Main Caps
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$4,645.49
Estimated to ship direct from manufacturer in 24hrs
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.245" Bore 9.800" Deck Height Standard BBC Camshaft Bearing Journal Standard BBC Lifter Bore Nodular Iron Main Caps
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$3,842.02
Estimated to ship direct from manufacturer in 24hrs
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.245" Bore 10.200" "Tall" Deck Height Standard BBC Camshaft Bearing Journal Standard BBC Lifter Bore Nodular Iron Main Caps
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$3,842.02
Estimated to ship direct from manufacturer in 24hrs
Lowest Price Guarantee
4.495 in. Cylinder Bore
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.495 in. Bore 9.800 in. Deck Height Standard Cam Journal & Lifter Bore Billet Splayed Main Caps
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$4,645.49
Estimated to ship direct from manufacturer in 24hrs
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.495 in. Bore 9.800 in. Deck Height 55 mm Cam Journal .904 in. Lifter Bore Billet Splayed Main Caps
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$5,173.48
Estimated to ship direct from manufacturer in 24hrs
FREE Shipping
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.495 in. Bore 10.200 in. Deck Height Standard Cam Journal & Lifter Bore Billet Splayed Main Caps
View Details
$4,645.49
Estimated to ship direct from manufacturer in 24hrs
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.495 in. Bore 10.200 in. Deck Height 55 mm Cam Journal .904 in. Lifter Bore Billet Splayed Main Caps
View Details
$5,173.48
Estimated to ship direct from manufacturer in 24hrs
FREE Shipping
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.495" Bore 9.800" Deck Height Standard BBC Camshaft Bearing Journal Standard BBC Lifter Bore Nodular Iron Main Caps
View Details
$3,842.02
Estimated to ship direct from manufacturer in 24hrs
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.495" Bore 9.800" Deck Height 55mm Babbit Camshaft Bearing Journal .904" Diameter Lifter Bore Nodular Iron Main Caps
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$4,347.23
Estimated to ship direct from manufacturer in 24hrs
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.495" Bore 10.200" "Tall" Deck Height Standard BBC Camshaft Bearing Journal Standard BBC Lifter Bore Nodular Iron Main Caps
View Details
$3,842.02
Estimated to ship direct from manufacturer in 24hrs
Lowest Price Guarantee
4.595 in. Cylinder Bore
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.595 in. Bore 10.250 in. Deck Height Standard Cam Journal & Lifter Bore Nodular Iron Splayed Main Caps
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$3,842.02
Estimated to ship direct from manufacturer on 04/30/25, pending manufacturer availability.
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.595 in. Bore 9.800 in. Deck Height Standard Cam Journal & Lifter Bore Billet Splayed Main Caps
View Details
$4,645.49
Estimated to ship direct from manufacturer in 24hrs
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.595 in. Bore 9.500 in. Deck Height 55 mm Cam Journal .904 in. Lifter Bore Billet Splayed Main Caps
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$5,173.48
Estimated to ship direct from manufacturer on 04/30/25, pending manufacturer availability.
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.595 in. Bore 9.850 in. Deck Height Standard Cam Journal & Lifter Bore Billet Splayed Main Caps
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$4,645.49
Estimated to ship direct from manufacturer in 24hrs
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.595 in. Bore 10.200 in. Deck Height 55 mm Cam Journal .904 in. Lifter Bore Billet Splayed Main Caps
View Details
$5,173.48
Estimated to ship direct from manufacturer on 04/30/25, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.595 in. Bore 10.250 in. Deck Height Standard Cam Journal & Lifter Bore Billet Splayed Main Caps
View Details
$4,645.49
Estimated to ship direct from manufacturer on 04/30/25, pending manufacturer availability.
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.595" Bore 9.800" Deck Height Standard BBC Camshaft Bearing Journal Standard BBC Lifter Bore Nodular Iron Main Caps
View Details
$3,842.02
Estimated to ship direct from manufacturer in 24hrs
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.595" Bore 9.850" Deck Height Standard BBC Camshaft Bearing Journal Standard BBC Lifter Bore Nodular Iron Main Caps
View Details
$3,842.02
Estimated to ship direct from manufacturer in 24hrs
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.595" Bore 10.200" "Tall" Deck Height Standard BBC Camshaft Bearing Journal Standard BBC Lifter Bore Nodular Iron Main Caps
View Details
$3,842.02
Estimated to ship direct from manufacturer in 24hrs
Lowest Price Guarantee
Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.595" Bore 10.200" "Tall" Deck Height Standard BBC Camshaft Bearing Journal Standard BBC Lifter Bore Billet Steel Main Caps
View Details
$4,645.49
Estimated to ship direct from manufacturer on 04/30/25, pending manufacturer availability.
Lowest Price Guarantee