R4 Race Block Casting # P4532982

Name: R4 Race Block Casting # P4532982
Brand: MOPAR PERFORMANCE
SKU: 312-P5007151AC
Price: 3030.99 USD
Availability: InStock

^$3,030⁹⁹

Truck Freight

Ships on 09/17/2026

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R4 Race Blocks

Siamese Bore Casting

2.25" Mains (302 Ford Main Bearings) - Requires Custom Crank

Main Caps: 4-Bolt, Center 3 Caps - Billet Steel

Deck Height: 8.575"

Dry Sump Oiling System Only

Cam Bearings - Not Included - Must use 60mm Roller Cam Bearings P5007361 & Custom Cam

Rough Bored to 4.050"

Casting # P4532982
45/59° Tappet Bores - Must use P5 or P5 Hemi Cylinder Heads

R4 blocks are generally used in racing applications and have a very short deck height. The short deck height requires the use of a custom timing cover (i.e. dry timing belt setup) and custom water pump since it cannot mount to the stock timing cover. A fabricated intake manifold or individual runner injection system must be used since the deck height is so short (cast 4 barrel type intakes do not fit). These blocks require a custom crankshaft that has smaller than stock mains (otherwise the same as a small block LA). These blocks require the use of a motor plate to mount the engine since they do not have stock style motor mounts. These blocks are now machined for use with a distributor, but this requires modifications w/ the short deck height. These blocks now use a stock 340 rear main oil seal. These blocks are normally used in racing applications like Competition Eliminator drag racing or USAC Silver Crown.

Part TypeEngine Block

BrandMOPAR PERFORMANCE

Package Height16.75

Package Width21.5

Package Length24.0

Weight245.0 PG

Part CategoryPerformance Parts

Part FitmentSemi Universal

Vendor Part NumberP5007151AC

Package Qty1

Package TypeEA

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