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BIG BLOCK CHEVY 300cc OVAL PORT ALUMINUM HEADS BY SPEEDMASTER
119cc COMBUSTION CHAMBERS
These heads are bare, without hardware.
This sale is for a set of heads (2 heads).
The Speedmaster bbc heads are perfect for 396, 402, 427, 454, 496 and 540 street/strip engines. They will produce up to 725 hp with the proper cam and intake manifold on pump gas. We also offer our new line of rectangular port bbc Bravo heads in our other listings.
In the lower section of this ad you will find valuable information on how these heads perform when used with various engine sizes and cam combinations in street rod form. Please read the complete ad before purchasing.
These heads are not suitable on 396 or 402 engines that have the less then 4.250" bore size. With the larger 2.250" intake valve on our OVAL heads, it can interfere with the cylinder wall. These heads are well suited on 4.280" and larger bore BBC engines. The recommended compression would be from 9.8:1 to 10.5:1 with pump gas, taking advantage of the aluminum castings.
Valve sizes to use is 2.250 and 1.88. These heads have the correct seat diameter to allow use of these valves.
These are true multi-purpose heads for street, drag race, and power boat applications. This set is an excellent upgrade over OEM cast iron heads on your big block engine. We honestly feel there is not a better set of heads for the price. These heads are tried and proven. The intake runner volume is 300cc, and the combustion chambers are 119cc.
You can reduce your engine weight by around 100 lbs. with the use of aluminum heads. You can also increase your power up to 250hp over an OEM 454 engine, depending on choice of cam and intake manifold. Compression ratio must be approx. 10.5:1 or higher on 427 and 454 engines. 496 or larger engines can get by with less compression but no lower than 10:1.
The horsepower gain from the weight reduction of aluminum heads alone is noticeable, not to mention the fact that aluminum heads will allow you to run a bit more compression without the risk of detonation. The benefits are many to running aluminum heads. The most expensive cars in the world all run them. There are no drawbacks!
Tech support is available. We are confident that we offer the best advice in the business.
We also offer these heads in built form. We hope you will check out our other listings for the many other items we have available.
SPEC INFO AND RECOMMENDED ACCESSORIES FOR FOR THESE HEADS.
Intake Gasket: Felpro 1212 For oval port heads.
Intake Port volume: 300cc
Intake Port Dim:
Int Port Location: Stock
Intake Valve Dia.: 2.250"
Exh Valve Dia.: 1.880"
Exhaust Port Dim:
Exh Port Location: Raised
Exhaust Gasket: Depends on what type exhaust you're using. Best to try and match up the gasket to your header or exhaust manifold
Head Gasket: Felpro 1017-1 for Mark V & VI blocks, or our PC-5211 MLS head gaskets for Mark V and earlier blocks.
Flow, Exhaust: BBC-50 Head bolts, or ARP 135-3607 Head bolts or our BBC-75 Head stud kits.
Manifold: Most any oval port style intake will work. Our oval port aluminum intakes fit very well.
Milling: Max. .060 Scroll down to see info in this listing for details on this.
Pistons: Most stock or aftermarket pistons. Our Wiseco pistons combine perfectly with these heads.
Push Rod length: You must use a push rod measuring device to determine what length is needed.
Push rod Guide Plate: We strongly recommend Dart adjustable guide plates. Not included. # BBC-ADJ-GP. See our other listings
Rocker Arm studs. ARP 100-7101 Do not use off-shore rocker arm studs. ARP only. Not included. See our other listings.
Retainers: Steel 10° Comp brand machined locks are used on all of our heads.
Spark Plug: Straight, .750"reach, gasket, Autolite 3923 or NGK 4544 for one step lower heat range. See our other listings for these.
Spring Pockets: 1.550" OD (.030" deeper max)
Springs: 1.46 outer diameter. Dual spring for hyd.
roller cams. Single for those running a hyd. flat tappet cam.
Valve Length: .250 over intake valves, std length exhaust valves.
Valve Stem Dia: .3415" - 11/32"
Valve Train: STD BBC 7/16" stud mount
Valve Guides: 1/2" OD Int = Mag-bronze Exh = Phos-bronze (.002" press)
Valve Guide length:
Valve Guide clearance: .0014" - .002" (with our .3415 dia. valve stem)
Valve Guide Spacing:
Valve Seats: Hardened Ductile Iron, .006" press
Valve Seat dim. Standard
Valve Seat angles: Int = 32° - 45° - 60° - 70° Exh = 37° - 45° - radius
Torque: Head Bolts = 65-70 ft/lb
Rocker Studs = 50 ft/lb
Manifold = 35 ft/lb
Block Use: Any BBC, GM OR DART Iron or Aluminum
Weight: 69-72 lbs fully assembled pair.
I'm sure many of you have noticed there are 2 high performance engine builders in Kingsport, TN with similar names, leading to a great amount of confusion.
We are Skip White Performance, NOT White Performance and Machine.
Due to the name similarity, many customers looking for us online inadvertently find them, thinking we are the same company. Definitely not...there is no connection between the two companies. We don't have a problem with free enterprise (competition). However, when the competition builds their foundation on such things as a name similarity and their supposedly long history of being in business, then we think it's about time we set the record straight.
We have owned White Performance since 2003, with the exception of the machine shop, which was owned by Fred White at the time. He continued to operate the machine shop and build engines for us while we continued selling online under the user ID of skipwhite and the store name of whiteperformance1.
Due to their limited production capability and many disagreements about the engine and head building process as well as workmanship, we opted to open a full scale machine shop of our own a few years later. Fred White began competing against us even though our contract had a non-compete clause in it.
As our business grew, we opened a second, much larger warehouse and machine shop around 2011, located on Brookside Ln. in Kingsport TN. By putting heart and soul in this company, we have become the number one street rod engine builder in the nation.
Fred sold his shop to an investor in 2016 and the new owners continue to reap the benefits from this confusion between the two shops. This investor lacked any knowledge of this industry. They continue to use the White Performance & Machine name. Contrary to what is posted on their website, Fred White is no longer associated with the company in any way. Their main spiel in advertising is, "In business since 1979," when in fact, we purchased the White Performance company in 2003, with the exception of the machine shop.
All in all, we have been in this business going on 17+ years. Skip White's passion has been owning and building street rods for 47 years on a personal level. The knowledge he has gained over time has allowed him to venture into this business and succeed to a very high level.
The great pretenders continue capitalizing on our success due to the name similarity, but have been degrading our reputation. We have been getting calls nearly on a daily basis from people that now realize there are two shops in this town with very similar names. Customers complain of serious problems in getting their orders in a timely manner from them. They think they purchased their cylinder heads from us. Due to the confusion, there is an increasing amount of negative feedback that is affecting our name within the street rod community, when in fact we have a near perfect reputation in this industry. We have an "A+" rating with the Better Business Bureau and we have maintained the A+ rating for many years.
FAST FORWARD TO PRESENT DAY...We have become the largest street rod engine builder in the nation. Our engines, rotating assemblies, and cylinder heads are built to very high standards and shipped to our customers in a timely manner. We are a premier seller on with a positive feedback score of well over 206,000 and growing, as compared to our competitor’s score of approximately 24,000.
Our engines are custom-built to our customers' specifications and are shipped in approx. 2-5 weeks, perhaps sooner, depending on the season. Our rotating assemblies usually ship out in about one week or less, and our heads ship in about a week or less.
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