Mopar Performance P5007151AC - Mopar Performance Cast Iron Engine Blocks & Components - Small Block
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Mopar Performance#312-P5007151ACR4 Race Block |
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$119
Mopar Performance P5007151AC - Mopar Performance Cast Iron Engine Blocks & Components - Small Block Details
R4 Race Blocks
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.
These blocks are made from high strength cast iron and are heavy-duty pieces with extra stock for improved strength. All of the blocks include 4-bolt main caps on the center 3 caps (with ARP main cap bolts). Most of the blocks come with a Siamese bore water jacket and some have the full water jacket. The 48° tappet bore blocks come with a 6-bolt cylinder head bolt pattern. The 59° blocks have a 4-bolt pattern for the cylinder head. The deck on these blocks is approximately .700" thick and they can be milled if desired.
This package includes the engine block assembly with main caps, main cap fasteners, and the block hardware kit. Some of the block hardware is installed in the block and some is included in a separate package with the block.
The R3 and R4 blocks are designed for use in racing where the engine builder does most of the final machine work (i.e. boring, honing, and camshaft bearing installation).
The 340 Replacement and Magnum Blocks are designed for customers who assemble the engine in their own workshop (i.e. blocks are honed to standard bore size, and the cam bearings are installed). Made in the USA.
