MGB & GT Forum
Harland Sharp rocker arm prices?
Posted by pinkyponk
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Dec 9, 2016 12:11 PM
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I noticed that I can buy a set of 16 roller rockers for a small block Chevy for $300 on the Harlan Sharp site. A set of 8 MGB rockers is also $300. Are we getting the shaft?
It would seem not... the Chevy set also includes 16 short shafts and 16 studs, and a set of adjusters. Maybe I should just convert to stud mount and sell off the spare 8 rockers...
Adrian
Home built Eaton M62 Supercharger with 8psi boost, 8:1 compression, custom "supercharger" cam from Schneider Cams, Mikuni HSR48 Carburetor, custom ground high ratio "stock" rocker arms, Maxspeeding rods with Teflon wrist pin buttons, custom aluminum cold air intake, CB Performance computerized ignition, Fidanza 9 pound flywheel, 1.44 exhaust valves in 48cc chamber head, matched manifolds, 2 1/4" exhaust system.
It would seem not... the Chevy set also includes 16 short shafts and 16 studs, and a set of adjusters. Maybe I should just convert to stud mount and sell off the spare 8 rockers...
Adrian
Home built Eaton M62 Supercharger with 8psi boost, 8:1 compression, custom "supercharger" cam from Schneider Cams, Mikuni HSR48 Carburetor, custom ground high ratio "stock" rocker arms, Maxspeeding rods with Teflon wrist pin buttons, custom aluminum cold air intake, CB Performance computerized ignition, Fidanza 9 pound flywheel, 1.44 exhaust valves in 48cc chamber head, matched manifolds, 2 1/4" exhaust system.
Dec 9, 2016 12:19 PM
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Why stop there? Install the whole SB Chevy motor...
Eric Russell ~ Mebane, NC
1961 MGA #61, 1981 Alfa Romeo GTV6, 1984 Alfa Romeo Spider, 1991 Honda ST1100
Eric Russell ~ Mebane, NC
1961 MGA #61, 1981 Alfa Romeo GTV6, 1984 Alfa Romeo Spider, 1991 Honda ST1100
ohlord
Rob C
A tiny Island off the coast of Washington State, N.W., USA
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1957 Land Rover Series I "EYEYIYI"
1957 Land Rover Series I "OVRLND" 1971 MG MGB 1971 MG MGB "Bedouin 2" & more |
Dec 9, 2016 12:30 PM
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Aren't you installing an sc specific Camshaft? Why the need of increased ratio rollers that will never see the rpm ?
Just interested in the thought process behind the contemplation.
LNDRVR4X4.COM
Home of Project "INCARN8'
1957 Series 1 Land Rover electric VEHICLE CONVERSION
FIXITUPCHAP.COM
FIXITUPCHAP INCORPORATED
RD3 Radar/ Electronic Warfare Technician
VIETNAM 1969-1972
Just interested in the thought process behind the contemplation.
LNDRVR4X4.COM
Home of Project "INCARN8'
1957 Series 1 Land Rover electric VEHICLE CONVERSION
FIXITUPCHAP.COM
FIXITUPCHAP INCORPORATED
RD3 Radar/ Electronic Warfare Technician
VIETNAM 1969-1972
Topic Creator (OP)
Dec 9, 2016 01:34 PM
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Joined 13 years ago
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I am doing a SC cam Rob. I'm just interested in better valve control. I can't see a way to make a crappier setup than OEM. I'd like a decent rocker shaft and good quality rockers... not the hand ground crap rockers we use... or the non case hardened cheese rocker shafts. Then there's the pitifully sloppy pedestals that fret...
I see that Harland Sharp have gone with bushings on the MGB rockers. Needle bearings on all the other ones. I wouldn't want bushings. Maybe I should look at the Fab-Tec Chevy Cavalier ones.
Adrian
Home built Eaton M62 Supercharger with 8psi boost, 8:1 compression, custom "supercharger" cam from Schneider Cams, Mikuni HSR48 Carburetor, custom ground high ratio "stock" rocker arms, Maxspeeding rods with Teflon wrist pin buttons, custom aluminum cold air intake, CB Performance computerized ignition, Fidanza 9 pound flywheel, 1.44 exhaust valves in 48cc chamber head, matched manifolds, 2 1/4" exhaust system.
I see that Harland Sharp have gone with bushings on the MGB rockers. Needle bearings on all the other ones. I wouldn't want bushings. Maybe I should look at the Fab-Tec Chevy Cavalier ones.
Adrian
Home built Eaton M62 Supercharger with 8psi boost, 8:1 compression, custom "supercharger" cam from Schneider Cams, Mikuni HSR48 Carburetor, custom ground high ratio "stock" rocker arms, Maxspeeding rods with Teflon wrist pin buttons, custom aluminum cold air intake, CB Performance computerized ignition, Fidanza 9 pound flywheel, 1.44 exhaust valves in 48cc chamber head, matched manifolds, 2 1/4" exhaust system.
Dec 9, 2016 01:50 PM
Joined 15 years ago
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. . . and what are you gaining when you purchase those expensive rocker arms, when brand new OEM rocker arms are only $16 each?
Why not just install a Rover V8 or a GM 3.4L V6 with fuel injection and really get some horsepower.
Roger N. Tanner
Professional Engineer, Retired
Why not just install a Rover V8 or a GM 3.4L V6 with fuel injection and really get some horsepower.
Roger N. Tanner
Professional Engineer, Retired
Topic Creator (OP)
Dec 9, 2016 01:58 PM
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I'd like to try and get 200 hp out of my original B series Roger. I think that's a bigger challenge than a V6 swap. This is the part of the hobby I enjoy. Driving is fun but I can drive all sorts of cars with lots of power. My favorite part of the hobby is the tinkering.
Adrian
Home built Eaton M62 Supercharger with 8psi boost, 8:1 compression, custom "supercharger" cam from Schneider Cams, Mikuni HSR48 Carburetor, custom ground high ratio "stock" rocker arms, Maxspeeding rods with Teflon wrist pin buttons, custom aluminum cold air intake, CB Performance computerized ignition, Fidanza 9 pound flywheel, 1.44 exhaust valves in 48cc chamber head, matched manifolds, 2 1/4" exhaust system.
Adrian
Home built Eaton M62 Supercharger with 8psi boost, 8:1 compression, custom "supercharger" cam from Schneider Cams, Mikuni HSR48 Carburetor, custom ground high ratio "stock" rocker arms, Maxspeeding rods with Teflon wrist pin buttons, custom aluminum cold air intake, CB Performance computerized ignition, Fidanza 9 pound flywheel, 1.44 exhaust valves in 48cc chamber head, matched manifolds, 2 1/4" exhaust system.
Dec 9, 2016 02:40 PM
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Since the higher ratio rockers opens the valve more at every point on the curve, you get the benefit of more lift at every point on the curve, it's not RPM dependent.
In reply to # 3409159 by ohlord
Aren't you installing an sc specific Camshaft? Why the need of increased ratio rollers that will never see the rpm ?
Just interested in the thought process behind the contemplation.
Just interested in the thought process behind the contemplation.
Dec 9, 2016 03:23 PM
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Joined 17 years ago
19,950 Posts
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They cost more because they are essentially hand made. They take Ford rockers and offset drill and bush them. More hand work = more $. But for the same price you can custom order mixed ratio intake/exhaust to give you exactly what you want. There comes a point where more isn't better.
jeff@advanceddistributors.com
jeff@advanceddistributors.com
Topic Creator (OP)
Dec 9, 2016 03:36 PM
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I'm not looking for more valve lift. Although my new cam is setup under the assumption that the stock rocker setup gives 1.42:1 which does not actually appear to be the case. I had to go through quite a few didoes to get 1.48:1 out of the set I am using. Going from memory they were 1.39:1 before I started... which is what I've read on other accounts of rocker arm shenanigans.
I am looking for a less primitive setup that moves my valves the prescribed amount with a bit more precision.
Adrian
Home built Eaton M62 Supercharger with 8psi boost, 8:1 compression, custom "supercharger" cam from Schneider Cams, Mikuni HSR48 Carburetor, custom ground high ratio "stock" rocker arms, Maxspeeding rods with Teflon wrist pin buttons, custom aluminum cold air intake, CB Performance computerized ignition, Fidanza 9 pound flywheel, 1.44 exhaust valves in 48cc chamber head, matched manifolds, 2 1/4" exhaust system.
I am looking for a less primitive setup that moves my valves the prescribed amount with a bit more precision.
Adrian
Home built Eaton M62 Supercharger with 8psi boost, 8:1 compression, custom "supercharger" cam from Schneider Cams, Mikuni HSR48 Carburetor, custom ground high ratio "stock" rocker arms, Maxspeeding rods with Teflon wrist pin buttons, custom aluminum cold air intake, CB Performance computerized ignition, Fidanza 9 pound flywheel, 1.44 exhaust valves in 48cc chamber head, matched manifolds, 2 1/4" exhaust system.
Dec 9, 2016 04:11 PM
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Joined 17 years ago
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If that's the case, you need to start with a precision valve job, to be certain that when you put a straight edge across your valve tips they are all at exactly the same height. Any variation there will result in a slightly different lift at the valve tip. Any good valve grinding machine will have a fixture to trim valve tips with a built-in micrometer for simplicity.
jeff@advanceddistributors.com
jeff@advanceddistributors.com
ohlord
Rob C
A tiny Island off the coast of Washington State, N.W., USA
Sign in to contact
1957 Land Rover Series I "EYEYIYI"
1957 Land Rover Series I "OVRLND" 1971 MG MGB 1971 MG MGB "Bedouin 2" & more |
Dec 9, 2016 05:44 PM
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Joined 12 years ago
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I'm quite familiar with how they work, just wondered with an sc specific grind and an engine that under boost
Probably won't see over 5500rpm where it will be noticed.
LNDRVR4X4.COM
Home of Project "INCARN8'
1957 Series 1 Land Rover electric VEHICLE CONVERSION
FIXITUPCHAP.COM
FIXITUPCHAP INCORPORATED
RD3 Radar/ Electronic Warfare Technician
VIETNAM 1969-1972
Probably won't see over 5500rpm where it will be noticed.
In reply to # 3409249 by Steve64B
Since the higher ratio rockers opens the valve more at every point on the curve, you get the benefit of more lift at every point on the curve, it's not RPM dependent.
In reply to # 3409159 by ohlord
Aren't you installing an sc specific Camshaft? Why the need of increased ratio rollers that will never see the rpm ?
Just interested in the thought process behind the contemplation.
Just interested in the thought process behind the contemplation.
LNDRVR4X4.COM
Home of Project "INCARN8'
1957 Series 1 Land Rover electric VEHICLE CONVERSION
FIXITUPCHAP.COM
FIXITUPCHAP INCORPORATED
RD3 Radar/ Electronic Warfare Technician
VIETNAM 1969-1972
About 12 miles from Sears Point, CA, USA
Sign in to contact
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Dec 10, 2016 12:45 AM
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Adrian,
Are you sure the measurements of an H&S Chevy rocker are the same as an MGB rocker? If they are not, the pushrod will not mate to the adjuster ball and the roller tip will nt be centered over the valve tip. The part numbers are different so I don't think they'll work! Basil 707.762.0974 basiladams@yahoo.com
Basil C. Adams
1956 MGA Coupe (Show Car)
1957 MGA Roadster (Driver)
1958 MGA Coupe (Racecar)
1959 MGA Coupe (unrestored)
1960 MGA Coupe (unrestored)
1960 MGA Roadster (Driver)
MKIII Elva Courier (E1056)
1967 427 Cobra
1972 Alfa Romeo Montreal
A coupla late MGBs
1960 Austin Healy BN7
More Cars than Brains
Are you sure the measurements of an H&S Chevy rocker are the same as an MGB rocker? If they are not, the pushrod will not mate to the adjuster ball and the roller tip will nt be centered over the valve tip. The part numbers are different so I don't think they'll work! Basil 707.762.0974 basiladams@yahoo.com
Basil C. Adams
1956 MGA Coupe (Show Car)
1957 MGA Roadster (Driver)
1958 MGA Coupe (Racecar)
1959 MGA Coupe (unrestored)
1960 MGA Coupe (unrestored)
1960 MGA Roadster (Driver)
MKIII Elva Courier (E1056)
1967 427 Cobra
1972 Alfa Romeo Montreal
A coupla late MGBs
1960 Austin Healy BN7
More Cars than Brains
Speedracer
Hap Waldrop
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Dec 10, 2016 04:08 AM
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Joined 17 years ago
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In reply to # 3409208 by pinkyponk
I am doing a SC cam Rob. I'm just interested in better valve control. I can't see a way to make a crappier setup than OEM. I'd like a decent rocker shaft and good quality rockers... not the hand ground crap rockers we use... or the non case hardened cheese rocker shafts. Then there's the pitifully sloppy pedestals that fret...
I see that Harland Sharp have gone with bushings on the MGB rockers. Needle bearings on all the other ones. I wouldn't want bushings. Maybe I should look at the Fab-Tec Chevy Cavalier ones.
Adrian
I see that Harland Sharp have gone with bushings on the MGB rockers. Needle bearings on all the other ones. I wouldn't want bushings. Maybe I should look at the Fab-Tec Chevy Cavalier ones.
Adrian
Adrian, the price difference comes form production run quantities, more Chevy buyers than us. AS mounting SBC rockers, as it goes with lying, taking more than one lie to get the job done, so is modification, if you go with stud mounted rocker arm system, to have to rethink oiling, Dave pulls it off with his non roller Cavailer set up, but with quite a few mods, including adjustable push rods. The HS 1.55 goes on the MG with shims and longer push rods with out much fuss, the same deal with the 1.625 ratio, but you'll need to oblong the push rod holes in the head for them, but no MG rocker arm set nets more ratio and lift when set up properly. The bushing/roller bearing deal is a joke, I ran both, makes no difference whatsoever, HS make you a set with roller bearing, but think about the nature of the rocker arm, and you'll find your answer, you would be wasting your money on roller bearings. As I said, no difference, it has been tested by literally hundreds of folks on the dyno, zero difference, period.
Hap Waldrop
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