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In the world of racing and performance, BIGGER is always better.  Ford Performance gets it -  and that's why it offers BOSS small blocks in Big Bore versions.  The Ford Performance BOSS blocks are designed to be a replacement for the legendary BOSS 302 and BOSS 351 blocks using the latest technology and manufacturing techniques available.  Cast from diesel grade iron with siamese bores, thick cylinder walls and decks, BOSS block strength is far superior to any Ford production block ever offered. 

 

Ford Performance Big Bore version of the BOSS 302 block makes it simpler and more economical to build really BIG small blocks.  To insure the most precise bore location, concentricity and integrity, the BOSS Big Bore blocks are machined an additional .125"? during the initial block fixturing and boring stage.  With an unfinished bore size of 4.120"?, Ford Performance BOSS 302 Big Bore blocks will support engine sizes up to 363 cubic inches. 

 

The Ford Performance BOSS block capability has been proven around the world, both on the track and on the street.  And, all Ford Performance BOSS blocks are cast and machined to the highest industry standards in the USA. 

  • 4.125" bore capacity, finished at 4.115" rough bore. Also available in standard bore version, part number: M-6010-BOSS302
  • 8.2" deck height, finished at 8.200" plus .010" to .015"
  • Designed with optimized cylinder wall length for stroker applications up to 3.5" with no grinding or clearancing.  (Depends on crank/rod manufacturer)
  • Splayed 4-bolt main on 2, 3, 4, main caps
  • 2-bolt main on first and fifth main caps
  • Main bearing bores finished to low limit
  • Finished lifter bores
  • Machined to accept factory roller lifter guides and lifter guide retainer
  • Fits factory 1979 - 1995 Mustang oil pan with custom oil pickup tube, part number: M-6622-BOSS302
  • NASCAR inspired front oil feed on both lifter galleys.
  • Revised cooling system passageways
  • Siamese bore
  • Increased bulkhead material
  • Threaded core and galley plugs (straight thread port plugs with O-ring)
  • Requires special length 1/2" 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/X2/C3/D3/Z304DA/Z2 cylinder heads. Not designed for production 302/351W or M-6049-Y302/Y303/X302/X303/X304/X305 cylinder heads
  • Uses common OD cam bearings M-6261-J351/R351
  • Unique cam plug M-6026-S351 included
  • M-6051-S331 or M-6051-CP331 head gasket recommended
  • Designed to be compatible with the original 302 and 351W blocks and includes the following features:
  • Designed to use stock type timing cover, timing Cover M-6059-D351 recommended (includes fuel pump provision)
  • 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
  • Weighs approximately 163 lbs.
  • Great price and value
  • 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 and thousands of laps before rebuild.

 Ford Performance BOSS Blocks   

Part Type
Engine: Engine Blocks
Instruction Sheet
Warranty Availability
Not Available
Packaged Dimensions
19.5" x 15" x 23
Packaged Weight
204 lb(s)
UPC Code
756122104392
Catalog Page Number
175
Country of Origin
United States

FRPP BOSS 302 Cylinder Block Big Bore

SKU: M-6010-B302BB
$3,350.00Price

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    Product Reviews

    average rating is 3 out of 5, based on 150 votes, Product ratings

    98% would recommend

    Thank you for your review.

    Cj Napier

    average rating is 5 out of 5

    Aug 17, 2022

    NA King

    I have used all of the big name tuners before I came across Ortiz and ran the fastest times I ever have, with Ortiz. . I ran my fastest time in much worse DA as well, compared to the other 2 big names. Don't waste your money like I did and go directly to the source of the fastest NA cars around!

    I recommend this product.

    SeanDev

    average rating is 5 out of 5

    May 27, 2022

    Installed on 2018 Taurus SHO

    Pump works great. To anyone who might want to save some cash and want a plug-in play install then order this fuel pump from 1A Auto
    2018 Ford Explorer V6 3.5L Turbo Passenger Side Fuel Pump Module Assembly TRQ FPA72032. Its a simple replacement. Pumps are same size, no boring/sanding ridge to make pump fit. No splicing of wires either, connector from 1A Auto is plug and play. Just reuse spacer on pump and use one of the new o-rings and your done. Took me 30 minutes. I swapped out float with OEM, explorer and SHO floats are different. Only pain is retainer on rod on housing, its plastic and you will need needle nose plyers to get it off.

    I recommend this product.

    Martha Gomez

    average rating is null out of 5

    Apr 18, 2022

    Question

    They are 2 injector’s, how many they are.?

    I recommend this product.

    Crazy Cooter

    average rating is 5 out of 5

    Apr 8, 2022

    LOVE THE E85 KIT!

    I bought the E85 conversion kit for my 3.7 from Ortiz Performance (OP) for a couple reasons. First, they specialize in the Cyclone whereas a lot of tuners don't want to bother tuning it (...cause what's the point?). Second, I talked via email at great length with one of their tuners, Lee Ament, and he was happy to take all the time I needed answering questions with detailed answers. Because of the amount of service I received before I purchased, I was convinced that I would be in good hands. I also liked that their favored injector (in the kit) is a genuine Ford part (OEM for the GT500).

    I could tell right away that the OP gas tune was superior to the canned, Bama tunes I was using previously. I could immediately feel that shifts were taking 1/3 less time to complete and I could feel a lot of throttle boost across all rpm and especially in 1st gear (low rpm). I remember asking Bama to add more throttle boost to my tune and they simply don't make changes like that.

    The E85 tune was great. Instant 10%-15% power boost and response across all rpm and really fills in the gap at lower rpm. Feels like I'm using a throttle booster, but I'm not.

    There's only so much you can do to a Cyclone without forced-induction and E85 is a welcome, significant improvement if you already have everything else.

    Installation is straight-forward, you can find a number of videos on YouTube that show exactly how to do this.

    The one important thing to note: These injectors are taller than the stock injectors and
    will not fit deep enough into the fuel rail UNLESS you do not use the stock fuel-injector clips!...which is completely OK! OP and all the above-mentioned videos will also state this. You will probably need a spacer (like a washer) on the 4 fuel rail bolts to fill a small gap. (If you don't pull the injector clips, the fuel rail will make contact with the manifold.) It will also run like crap until you put your first OP tune on it.

    I recommend this product.

    Robert J

    average rating is 5 out of 5

    Mar 29, 2022

    Wonderful Service

    Sent my manifolds in (USPS wasn’t sure about the address but they got there just fine), took a handful of days to do the porting and about another week to ship back but I’m very happy with the results. Customer service was polite and helpful regardless of how often I messaged them, definitely would recommend

    I recommend this product.

    eduardo guerra

    average rating is 5 out of 5

    Jan 3, 2022

    Great customer service

    Great customer service and fast, currently tuning my 2014 Mustang Twin turbo 5.0 and it runs great! thank you

    I recommend this product.

    Roberto Salazar

    average rating is 5 out of 5

    Jan 2, 2022

    Roush air intake SHO

    The over all ordering experience was a little lack luster at start. Ordered the intake on 12/3 and it was not going to ship for sometime due to a back order, which I don’t blame the Ortiz team at for one bit. However they quickly turn the ordering experience around, with rapid and prompt reply to my emails( no matter how much I bugged them). Once it was pretty clear the intake I wanted wasn’t going to ship before the end of the year they offered me another product at no additional charge. All in all I got a better product, excellent customer service and I’m glad and proud to say my 2015 SHO is tuned and take care of by Ortiz Performance. Greta company, great people and a great over all experience.
    Thanks for all your hard work over the holidays and I’m glad I was referred to you by a fellow SHO owner.

    Thanks Ortiz Performance.
    Shout out to Lee as well! You rock man!

    I recommend this product.

    Dustin Kilby

    average rating is 5 out of 5

    Dec 8, 2021

    Great Look!

    I wish the description would have more description as to what you are ordering and the difference with/without the rear silicone boot.
    It is very difficult to install the rear silicone boot on the rear turbo. I would put slightly bigger clamps where they mount on the turbos as well. But the product is top grade! Looks really great!! Performs great as well. I will be doing the hot pipes for sure from ecopower parts as well.

    I recommend this product.

    Allen B

    average rating is 5 out of 5

    Oct 9, 2021

    Port work

    Man quick turnaround, I had my Cj intake and my heads ported and the car feels so much better GREAT SERVICE AND GREAT PRICE I can't wait to see the numbers once it's all dialed in.

    I recommend this product.

    Shylow Strickland

    average rating is 5 out of 5

    Sep 7, 2021

    @murdzilla3.7 Mustang

    I purchased the Custom Tunes for my 2011 3.7, and i can honestly say Ortiz is the best tuner in the world in my opinion. 7 days a week Twice on Sunday. If you want to gap v8's and rip the streets slaying the competition, you have 100% come to the right place.

    I recommend this product.

    Shylow Strickland

    average rating is 5 out of 5

    Sep 7, 2021

    @murdzilla3.7 Mustang

    I purchased the Ghost Cam and Bravo 240. Hands down the best decision in my opinion. The Ghost sounds so amazing, everyone is always complimenting the idle. The drive ability is great, no issues. The Bravo is also one of my favorite things as well. As I decelerate you can literally here the bald eagles and F18's, its wild!! Seriously though it sounds like thunder with a mix of gunshots in there.. its absolutely amazing in every way. Ortiz knows best!!

    I recommend this product.

    Julian

    average rating is 5 out of 5

    Jan 14, 2021

    Power Pack

    I have been running this tune/package on my SHO for over a year. Increased performance and fuel economy...never thought you could get both. Lee’s customer support and Luis’ tuning and turnaround time was beyond impressive. Luis reviewed multiple datalogs until deciding the car was running perfectly and safely, making smooth power and shifting on point. They answered any questions and concerns almost immediately and an updated tune was sent within 24 hours. That’s what will keep me coming back.

    I recommend this product.

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