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Author Topic:   351C roller rockers...?
MrXerox
Gearhead

Posts: 348
From: Oklahoma City, Oklahoma
Registered: Nov 2000

posted 08-20-2001 03:52 PM     Click Here to See the Profile for MrXerox   Click Here to Email MrXerox     Edit/Delete Message   Reply w/Quote
I am in the market for some new roller rockers for my 351C and have been reading the archives for some info. I plan on staying away from Crane and Motorsport Looks like my best choices are Crower, Harland Sharp and Comp Cams?? I am leaning towards the Comp Cams due to the fact that the look the exact same as the Crowers and cost almost $100.00 less. Does anyone have experience with these? I know Steve and Kid run the Crowers...Also, would it be better for be to buy half 1.6 and half 1.7s to give the exhaust more lift than the intake if I plan on running a 150HP NOS system in the future? My cam is a solid roller 244 @.050 .623/.623 on a 4V quench head with a C6 3500 stall.

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7DMACH1
Gearhead

Posts: 2359
From: PHILA. PA.
Registered: Feb 2001

posted 08-20-2001 05:29 PM     Click Here to See the Profile for 7DMACH1   Click Here to Email 7DMACH1     Edit/Delete Message   Reply w/Quote
One thing the rollers are made for 7/16" studs. You can buy a stud kit from Crane to adapt the 5/16" holes in you heads to step up to 7/16" and it comes with guide plates but the best way is to have your heads machined to remove the bosses for the bolt down rockers and drilled for 7/16" studs.I don't know how much the other brands cost but the Harland Sharps ran me $210.00. RAY

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1970 MACH 1 351C 4SPD
1986 CAPRI 5.0 5 spd.
2001 LINCOLN LS V8

[This message has been edited by 7DMACH1 (edited 08-20-2001).]

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SteveLaRiviere
Administrator

Posts: 43151
From: Saco, Maine
Registered: May 99

posted 08-20-2001 05:29 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by MrXerox:
I am leaning towards the Comp Cams due to the fact that the look the exact same as the Crowers and cost almost $100.00 less.

The major difference is the Crowers are stainless steel, vs chrome moly for the Comp Cams.

That said, I might try a set of Comp Cams rockers myself the next time.

------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
Ford. The closer you look, the better WE look!

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clevelandstyle
Gearhead

Posts: 1035
From: Connersville, IN
Registered: Jul 2001

posted 08-20-2001 06:19 PM     Click Here to See the Profile for clevelandstyle     Edit/Delete Message   Reply w/Quote
I am using Harland Sharps and have had no problems.

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MrXerox
Gearhead

Posts: 348
From: Oklahoma City, Oklahoma
Registered: Nov 2000

posted 08-20-2001 06:42 PM     Click Here to See the Profile for MrXerox   Click Here to Email MrXerox     Edit/Delete Message   Reply w/Quote
Yes, the heads have been machined for screw in studs. Anyone care to reply to the mixing of the 1.6 and 1.7s?

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kid vishus
Gearhead

Posts: 6098
From: middle of NC
Registered: Oct 2000

posted 08-20-2001 08:28 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
I run the rockers staggered but it si only for valve to piston clearance. If I had more clearance on the intake side I would run the 1.73's on them too. The car was faster with the "bigger" rockers, but the clearances were just too tight.

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SG236
Gearhead

Posts: 416
From: Jasper, TN, USA
Registered: Dec 2000

posted 08-23-2001 09:55 PM     Click Here to See the Profile for SG236   Click Here to Email SG236     Edit/Delete Message   Reply w/Quote
I have used the Crane Gold 1.73s with no problems at all.

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Russ Hood
70s Maverick S/Pro
https://mustangsandmore.com/ubb/SG236.html

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n2oMike
Gearhead

Posts: 2419
From: Spencer, WV
Registered: Jan 2001

posted 08-23-2001 10:21 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
The stock rocker ratio for a 351C is 1.73

Most aftermarket roller rockers have this ratio. Crane used to offer a 1.65 unit (which makes things a little easier with most lobes designed around the chevy 1.5 rocker.)

On my 302, which came stock with 1.6 rockers, I run 1.7's on the intake to get a little additional lift. The exhaust was already around 0.560", which is plenty for a flat tappet street cam, so I left the 1.6's on there.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367

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