- Contact to get ETA before purchasing
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Ford Performance Engineers have designed the replacement for the legendary BOSS 302 and 351 blocks using the latest technology and manufacturing techniques from both the production and racing worlds. The BOSS block capability has been proven abound the world – both on the track and on the street. By preserving many of the dimensions and features from the original 289-351 blocks, the BOSS blocks are compatible as replacements for use in just about any vehicle that used a Windsor style engine. Cast from diesel grade iron and designed with added material in key areas, BOSS block strength is far superior to any Ford OE block ever produced.
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4.125" bore capacity, finished at 3.990" to 3.995" rough bore. Also available in big bore version, part number: M-6010-B302BB
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8.2" deck height, finished at 8.200" plus .010" to .015"
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Designed with optimized cylinder wall length for stroker applications up to 3.5" with no grinding or clearancing. (Depends on crank/rod manufacturer)
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Splayed 4-bolt main on 2, 3, 4, main caps
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2-bolt main on first and fifth main caps
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Main bearing bores finished to low limit
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Finished lifter bores
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Machined to accept factory roller lifter guides and lifter guide retainer
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Fits factory 1979 - 1995 Mustang oil pan with custom oil pickup tube, part number: M-6622-BOSS302
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NASCAR inspired front oil feed on both lifter galleys.
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Revised cooling system passageways
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Siamese bore with drilled coolant crossover holes (Except on M-6010-B302BB)
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Increased bulkhead material
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Threaded core and galley plugs (straight thread port plugs with O-ring)
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Requires special length 1/2" head bolts M-6065-BOSS or head studs M-6014-BOSS recommended with M-6049-X306/X307/X2/Z304DA/Z2 heads
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Designed for use with the following heads-
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X306
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X307
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X2
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C3
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D3
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Z304DA
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Z2
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GT40P
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Not designed for the following heads
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Production 302/351W [GT40P is compatible]
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M-6049-Y302
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Y303
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X302
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X303
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X304
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X305
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Uses common OD cam bearings M-6261-J351
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Unique cam plug M-6026-S351 included
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M-6051-S331 or M-6051-CP331 head gasket recommended
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Designed to be compatible with vehicles equipped with the original 302 and 351W block
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Designed to use stock type timing cover, M-6059-D351 recommended (includes fuel pump provision)
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Fits factory Mustang oil pan with custom oil pick-up tube M-6622-BOSS302
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M-6026-A Service Replacement Plug and Dowel Kit available separately:
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Includes O-ring threaded plugs, black anodized aluminum plugs with Buna "O" rings for the oil galleys, water drains and core holes, and dowels for front cover, clutch housing and cylinder heads
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Retains clutch cross shaft pivot hole
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Original Style oil filter location
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Original motor mount boss locations
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Original bell housing pattern
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Weighs approximately 175 lbs.
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Great price and value
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The foundation for 8.2" deck projects
Proven performance - used in Ford Performance sealed 347cid race engines and Ford Performance high performance crate engines, a proven winner out of the crate with thousands of laps to demonstrate durability.
For cylinder head compatibility questions, please contact the Ford Performance Techline.
Shipping costs and lead times can vary, use the contact form below to confirm order cost and timeframe.
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
To start a return, you can contact us at brian@paulsautomotiveengineering.com. Please note that returns will need to be sent to the following address: 9750 Conklin Road Blue Ash, OH 45242
If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
You can always contact us for any return question at brian@paulsautomotiveengineering.com.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right. If we do not receive notice within 7 days of receiving order, we cannot process return.
Exceptions / non-returnable items
Unfortunately, we cannot accept returns on sale items or gift cards.
Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.
Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at brian@paulsautomotiveengineering.com.
