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300 roller rockers 
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Post 300 roller rockers
i found a pedistil rocker arm for the 1985 and newer 300 with a 1.7 ratio and roler tip and it is aluminum. i talked to scorpion direct and they say it is a bolt on part unless you have really shaved the head and block then you will have to shim them up. i have mine in the mail will post pics latter







http://www.flatlanderracing.com/scorpio ... rdSBoffset


Thu Jul 26, 2007 5:02 pm
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that bears some investigation, as they not only list V-6 but they include the 240 with that latter generation 300. I do know that the valves are quite a bit different for the motors throught the years.

John


Thu Jul 26, 2007 8:05 pm
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Quote:
SCP1069 Ford Inline V-6 240-300 (Pedestal Mount) 1.73F BBF Pedestal Mount (12 pieces) $169


The fact that they list the 240-300 as a V-6 tends to make me nervous.

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Thu Jul 26, 2007 8:12 pm
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i talked to the man whe makes them and the hole v6 thing is a typo from the person who made the page. scorpion makes stuff for comp, crain, crour, isky, elgen, the list gose on and on. they are the larger manufacuar of rocker in the US and if i enterperted the info the better busned buro faxed me thy are the majer for the world. i will post more next week when i ger them.


Thu Jul 26, 2007 8:54 pm
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fordlovingwelder wrote:
i talked to the man whe makes them and the hole v6 thing is a typo from the person who made the page. scorpion makes stuff for comp, crain, crour, isky, elgen, the list gose on and on. they are the larger manufacuar of rocker in the US and if i enterperted the info the better busned buro faxed me thy are the majer for the world. I will post more next week when i ger them.


I not sure I am buy the load this guy is telling you. It has been a few years, But I have had more than a few roller rockers on my desk and in my hands.
Crane (not crain) may not have invented the roller rocker but they have made some of the best ones i've seen, and i've seen the Steel stock, Alum extrudsions, caged bearings, and setscrews come in the plant and Rocker arms leave the plant in daytona beach. Crane is one of te larger "private label" maufacturers in the aftermarket performance engine parts business.
And they make many rocker for Frod racing, GM performance parts and many other Cam companys.

Not back to those scorpion rockers. don't get me totaly wrong I am not saying they are junk. Just inspect carefully and don't just bolt down, fire it up and forget them. I'd be willing to bet those rocker he is telling you about are bolt down 351C,351M,429-460 rockers.
Bolt em on and then look at the most important thing. where is the roller on the valve. I have actully considered a set of these for my 351M truck engine.

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Fri Jul 27, 2007 8:33 am
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Competition Cams and Crane make their own stuff.

I have looked at Scorpion roller rockers a few times and I think they look cheap and cheesy. I would never run them.

My 2 cents.....


Fri Jul 27, 2007 10:06 am
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I wouldn't trust them for one second @ 7k RPM. But on my 351M that is not likely to see over 4k rpm they might be good enough to last.

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Fri Jul 27, 2007 1:53 pm
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FYI the Scorpion rockers for the 240/300 are their BBC relisted Talked to them last year at PRI and asked one of the owners about them and thats what he told me.

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Sat Jul 28, 2007 4:26 am
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Here's anouther to consider:

http://www.cranecams.com/?show=browsePa ... r=50750-12

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Sun Jul 29, 2007 11:40 am
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Crane rockers are well known on this board. The problem is that they are only 1.6 ratio. Everybody is looking for a 1.7-1.75 ratio roller rocker for the late model pedestal head. The 1.75 ratio rockers foa a Ch**y I6 fit the early 240/300 heads, but there's an unresolved question as to what surgery is required to make them fit a late model pedestal head.

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Sun Jul 29, 2007 12:28 pm
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whats the up side to using crane rockers
also, whats need to put them on? will they only fit EFI heads?


Mon Jul 30, 2007 11:46 am
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FYI.....

I purchased the Scorpion roller rockers for my 300.....I couldn't get them to ride on the valve stem correctly. I ended up with a set of BBC 1.7 rockers that ride right on. Make sure you check them!


Fri Aug 17, 2007 8:35 pm
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Got the make and PN on those BBC roller rockers and is your valve cover clearance ok?

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Fri Aug 17, 2007 10:28 pm
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I think they were Scorpion part #1014...BBC with 7/16 stud. You will need to tap for screw in studs and get a measurement for your pushrod length. They will not clear a stock valve cover, you will need a Clifford tall V/C


Fri Aug 17, 2007 11:40 pm
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Many thanks!

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Sat Aug 18, 2007 3:04 pm
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sno_mobile wrote:
I think they were Scorpion part #1014...BBC with 7/16 stud. You will need to tap for screw in studs and get a measurement for your pushrod length. They will not clear a stock valve cover, you will need a Clifford tall V/C


You might be able to "stack" two vavle cover gaskets together and use the stock cover. It worked on mine. (two gaskets glued together with weather strip adhesive)

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Sun Aug 19, 2007 10:02 am
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In thoughts of valve cover clearance, do the chebby rockers clear the valve cover on the older 300's?

Thanks Marc

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Sun Aug 19, 2007 10:16 am
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Usally any rocker arm clears any cover, Its the lock nut on top that will not clear.

If you have a old extra steel cover and don't mind a few dents try this idea.

Take the stock cover without a gasket lay in place on top of the adjusting nuts and take a large rubber mallot and beat the heck out of it to dimple the cover.

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Sun Aug 19, 2007 10:31 am
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Other possibilities:

Double gaskets

Take 2 valve covers. Cut one off just above the flange, slip it over the other and mark the fitup line cut the second off about 1" above the line, re-assemble and braze

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Sun Aug 19, 2007 10:54 am
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As I recall, the VC clearance issue has been discussed before and I think the problem arises when using the higher lift rockers when running a higher than stock lift cam Like the Comp or Crane 260h grinds or bigger.

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Sun Aug 19, 2007 12:27 pm
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Can't recall when it was asked, but someone asked what the inside height measurement is on a Clifford cast aluminum rocker cover for the BB6. It's minimally 4.25"; I know my brand new & plated all purty stock Ford cover would not fit with my rockers' poly locks. The Clifford cover has plenty of clearance, just have to set up the center divider so that the PCV system can actually work properly.

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Fri Dec 14, 2007 4:09 am
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I use the Comp Cams roller rocker listed for the 300, over them is a Clifford valve cover, no problems.


Fri Dec 14, 2007 11:38 am
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J.R. wrote:
Can't recall when it was asked, but someone asked what the inside height measurement is on a Clifford cast aluminum rocker cover for the BB6. It's minimally 4.25"; I know my brand new & plated all purty stock Ford cover would not fit with my rockers' poly locks. The Clifford cover has plenty of clearance, just have to set up the center divider so that the PCV system can actually work properly.

J.R.
SoCal
Please explain the center divider thingy...

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Fri Dec 14, 2007 11:24 pm
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The centre divider is to make the PCV system work properly. If you have an undivided cover, it "short-circuits".

A baffle makes it more likely your airflow goes down the oil drain holes in the head, through the crankcase, and up the other side side to exit via the PCV. This possibly aids engine cooling a little, too.


Fri Dec 14, 2007 11:54 pm
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strech4020 wrote:
In thoughts of valve cover clearance, do the chebby rockers clear the valve cover on the older 300's?

Thanks Marc


Yes

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Mon Dec 17, 2007 12:39 pm
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The centre divider is to make the PCV system work properly. If you have an undivided cover, it "short-circuits".

A baffle makes it more likely your airflow goes down the oil drain holes in the head, through the crankcase, and up the other side side to exit via the PCV. This possibly aids engine cooling a little, too.


Just to ad a bit to Addo's comments, the function of the PCV system is to evacuate blow-by from the rings. The blow by contains all the products of combustion, some of them are harmful to the engine surfaces, others will contaminate and deteriorate the oil.

In the good old days, we used to just vent the blow-by out the engine through a vent tube. That wasn't so environmentally kosher, so now everything gets recycled through the engine combustion system a second time, which reduces unburned hydrocarbons, etc.

Possibly the worst situation from a disfunctional PCV system is a buildup of water vapor in the oil, and rust and corrosion in the engine.

John


Tue Dec 18, 2007 8:20 pm
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does anyone make V/C spacers like these?
http://www.jegs.com/webapp/wcs/stores/s ... 4_-1_11355

would there be a market for them??


Wed Dec 19, 2007 12:22 pm
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Apparently I need to put a divider in my valve (rocker arm) cover. It didn't come with one and I didn't realize it needed one :(

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Thu Dec 20, 2007 12:56 pm
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Nothing more noxious then parking next to or worse between a couple of Detroit "large cars" puking that crap out the crankcase vent tubes in a truck stop parking lot.

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Fri Dec 21, 2007 1:06 pm
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Traitor wrote:
does anyone make V/C spacers like these?
http://www.jegs.com/webapp/wcs/stores/s ... 4_-1_11355

would there be a market for them??
I don't think for the prices they ask for them. It would be more cost effective to buy a C-R valve cover. 'Course those prices are for two spacers.

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Fri Dec 21, 2007 10:45 pm
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Scorpion Performance SCP1069 is the part number for the ones from them specifice for the 240 300 engine


Fri Feb 22, 2008 1:07 am
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