Mercruiser 3.0L rocker arms

[fishrdan]

Hi all,

I need to order a set of 1.75:1 ratio rocker arms, balls and nuts for my 72 Mercruiser 140HP (3.0L 181CI) engine, noticed a few of them galled up during engine rebuild. Marine dealers want over $100 for the set, but from what I've found GM inline 6 engines use 1.75:1 3/8" rocker arm, ball and nut.

Harland Sharp lists 1.75 3/8" rockers for GM inline 6 cylinder engines, Crane Cams also lists the rocker ratio at 1.75 for the GM inline 6 engines. http://www.cranecams.com/?show=browseParts&lvl=2&prt=5&Vehicle_Type=Auto&Cylinders=6&Engine_Make=CHEVROLET&Year=1968&Engine_Size=194-250%20C.I.&partNumber=200511&partType=camshaft

I looked up the rocker arm assemblies for a 1968 ChevyII (inline 6 250 engine) and found them for $3.73 each, $30 for the set. Anyone know if the rocker arms from an early model (62-84) GM inline 6 are the same part used in the Mercruiser 3.0L (GM 181 4cyl)?

Thanks!
Dan

 

[firehog6305]

Re: Mercruiser 3.0L rocker arms

its very hard to say without miking them, your best bet, is to go to a machine shop, and ask them for the same ones, rocker arms are the same for the marine or auto installation good luck

 

[Coors]

Re: Mercruiser 3.0L rocker arms

a trick on the new ones-slather with cam-lube or STP; they usually gall when new, unless there is crud in the oil, or not enough oil hitting them (blocked passages, etc.)

 

[fishrdan]

Re: Mercruiser 3.0L rocker arms

Coors, the rockers were galled before the rebuild, guess it's 30+ years of wear and tear,,, and probably neglect from previous owners,,, or maybe myself

I found the rocker assemblies for ........................ $2.17 each, wholly smoking deal of $18 for the complete set! I got board and dug up a cross reference that shows these rockers were used in a bunch of GM engines.

Part # Details (all the same rocker assemblies, different manufacturer's)
1 Clevite 214-1030
2 Elgin RK-402
3 Fed. Mogul R-832
4 Melling MRK-402
5 Pioneer RK-375-B
6 SBI 181-1012


Engine Details
Competitive Interchanges Also Fits
GM / CAR 153/2.5L OHV L- 4 Chev. 3.875" Bore 62-70 Rocker arm kit.
GM / CAR 194/3.2L OHV L- 6 Chev. 3.563" Bore 62-67 Rocker arm kit.
GM / CAR 215/3.5L OHV L- 6 Pont. 3.750" Bore 64-65 Rocker arm kit.
GM / CAR 230/3.8L OHV L- 6 Chev. 3.875" Bore 63-70 Rocker arm kit.
GM / CAR 250/4.1L OHV L- 6 Chev. 3.875" Bore 66-79 Rocker arm kit.
GM / TRUCK/VAN 153/2.5L OHV L- 4 Chev. 3.875" Bore 63-65 rocker arm kit.
GM / TRUCK/VAN 181/3.0L OHV L- 4 Marine 4.000 Bore Rocker arm kit.
GM / TRUCK/VAN 194/3.2L OHV L- 6 Chev. 3.563" Bore 63-66 Rocker arm kit.
GM / TRUCK/VAN 230/3.8L OHV L- 6 Chev. 3.875" Bore 63-69 Rocker arm kit.
GM / TRUCK/VAN 250/4.1L OHV L- 6 Chev. 3.875" Bore 66-84 Rocker arm kit. Ex. Sprint.
GM / TRUCK/VAN 292/4.8L OHV L- 6 Chev. 3.875" Bore 63-89 Rocker arm kit.

Thanks for the responses and I hope this info helps someone else in the future,
Dan

 

[Coors]

Re: Mercruiser 3.0L rocker arms

cool