Roller Rockers for Ford 300 Carborated

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12-29-2010, 09:46 PM

craighurst

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Roller Rockers for Ford 300 Carborated

So I was thinking of putting in some roller rockers in my ford 300 to free up some hp bevause i heard the switch willl be a gain of 15hp. Im not sure on whether to use bbc/bbf or sbc/sbf roller rockers because I would prefer to not have to change the rocker posts out but its not a big deal. And by the way I was gonna use a 1.7 ratio rocker. And also what are all the things that i need to do inorder for this to work because i heard of people saying to run rod guides and its all confusing.

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12-29-2010, 10:43 PM

Harte3

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If just a switch to roller rockers could free up 15 hp there would be a huge rush to do so...but there isn't. 15 hp is a bit of a stretch. JMO

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12-29-2010, 10:52 PM

craighurst

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Ok yeah it is a little bit of a stretch but but would frre up some hp and give me a bigger lift so it can breath easier too

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12-30-2010, 09:04 AM

f100jim

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Just going to roller rockers is not going to free up any measurable HP. If you are talking about roller rockers with a higher ratio, like 1.75:1 compared to the stock 1.6:1 rockers, then you may get a few extra HP (probably not 15, though). For $ spent, roller rockers are not a big HP gainer. I just bought a set of 1.75:1 standard rockers for my 300 for $46.

Roller rockers are used in high performance engines with high valve lift mainly because they reduce side forces on the valve stem and valve guides.

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12-30-2010, 11:05 AM

F-250 restorer

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You will notice a bit of a power increase with the 1.7's. Harland Sharpe is the only manufacturer that I know of who makes r.rockers specifically for the 300. Sbc, sbf, or bbf WILL NOT WORK. Unless you are using the Harland Sharpe ones (listed under AMC on their website for some reason, $265), you have to use bbc r.rockers. You can find a used set on ebay for about $100. Stay away from the cheap Chinese Pro Comp ones.

Installing them brings the p.rod closer to the valve side of the slot in the head. And you have to check to see where the roller tip is contacting the v.tip through the entire v.movement. It should start just past center on the dizzy side of valve, and move past center to the same point on the exhaust side of the v. IMO you would be better off to get the lift from the cam. I would also change your timing gears to metal/metal because of the added strain.

If you have a 84 and newer head: <!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w

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ontVertAlignInTxbx/> <w:Word11KerningPairs/> <w:CachedColBalance/> </w:Compatibility> <m:mathPr> <m:mathFont m:val="Cambria Math"/> <m:brkBin m:val="before"/> <m:brkBinSub m:val="--"/> <m:smallFrac m:val="off"/> <m:dispDef/> <m:lMargin m:val="0"/> <m:rMargin m:val="0"/> <m:defJc m:val="centerGroup"/> <m:wrapIndent m:val="1440"/> <m:intLim m:val="subSup"/> <m:naryLim m:val="undOvr"/> </m:mathPr></w:WordDocument> </xml><![endif]--><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority

9; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin;} </style> <![endif]--> A pedestal mount 300 head can use stud mount rockers if you use a pushrod guidplate conversion kit. I have intsalled it on my 90 cyl head and it all works just fine. Crane part number 36655-16 will give you 3/8 studs and guideplate for 5/16 pushrods. If you go this route hardened pushrods are not required becuse the kit has nylon inserts in the guidplates. I had to mix a couple of kits on mine cause I needed 7/16 studs for BBC rockers I already had. It is best for long life of the nylon inserts if you polish the pushrods to make sure there are no burrs on them. This is easy to do in a drill.
This conversion kit will also make your valvtrain adjustable.

You can buy ARP screw in studs from Summit Racing for about $35. Most of the bbc rockers will be 7/16", but there are a few with 3/8".

Good luck.

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12-30-2010, 11:40 AM

craighurst

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ok so if i get 7/16 studs installed in the head then the bbc rockers are just a bolt in thing no other work needed?

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12-30-2010, 11:42 AM

craighurst

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Also my ford 300 is a 1973
And it .30 over,high comp pistons, ithink a 270 cam,clifford intake and split exhaust, holley 4barrel

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Roller Rockers for Ford 300 Carborated

Roller Rockers for Ford 300 Carborated

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