Ford Performance Parts Boss 351 C.I.D. Engine Blocks

Ford Performance Parts Boss 351 c.i.d. engine blocks are based on Windsor 351 architecture with Cleveland-sized 2.749 in. main bearing journals. Available in two deck heights, 9.2 in. and 9.5 in., they feature 4-bolt main caps and screw-in freeze plugs. Technological improvements, such as splayed main bolts, siamesed bores with engineered coolant cross-drilling, front crossover lifter oiling, and diesel-grade iron with 41,000 psi tensile strength separate Ford Performance Parts Boss 351 c.i.d. engine blocks from both stock and aftermarket blocks. They can accept a maximum stroke of up to 4.250 in., depending on the crankshaft/connecting rod manufacturer, with a maximum bore size topping out at 4.185 in. (sonic check recommended).

Features include:

* Available in standard and Big Bore versions
* Supports displacements up to 460 cubic inches
* Splayed 4-bolt main on 2, 3, 4, main caps
* 2-bolt mains on 1 and 5 main caps
* Main bearing bores finished to low limit
* Finished lifter bores
* Machined to accept factory roller lifter guides and lifter guide retainer
* Revised cooling system passageways
* Increased bulkhead material
* Threaded core and galley plugs (straight thread port plugs with O-ring)
* Requires special length 1/2 in. head bolts M-6065-BOSS or head studs M-6014-BOSS recommended with M-6049-X306/307/Z304DA heads
* Designed for M-6049-X306//X307/C3/D3/Z304DA cylinder heads
* Not designed for production 302/351W or M-6049-Y302/Y303/X302/X303/X304/X305 cylinder heads
* Use common O.D. cam bearings M-6261-J351/R351
* Unique cam plug M-6026-S351 included
* Compatible with original 302 and 351W blocks
* Designed to use stock type timing cover (M-6059-D351 with fuel pump provision recommended)
* Fits factory Mustang oil pan with custom oil pick-up tube M-6622-BOSS302
* Retains clutch cross shaft pivot hole
* Original-style oil filter location
* Original motor mount boss locations
* Original bell housing pattern
* 9.2 in. deck height blocks weigh approximately 195 lbs.
* 9.5 in. deck height blocks weigh approximately 205 lbs.
* Great price and value
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