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Camshafts, help, rocker arms, 350 sbc

I have a stock 350 sbc an i was wondering if i would need new rocker arms for this camshaft at summit part number K00172. Cam Style Hydraulic flat tappet Basic Operating RPM Range 1,800-5,200 Intake Duration at 050 inch Lift 218 Exhaust Duration at 050 inch Lift 218 Duration at 050 inch Lift 218 int./218 exh. Advertised Intake Duration 274 Advertised Exhaust Duration 274 Advertised Duration 274 int./274 exh. Intake Valve Lift with Factory Rocker Arm Ratio 0.450 in. Exhaust Valve Lift with Factory Rocker Arm Ratio 0.450 in. Valve Lift with Factory Rocker Arm Ratio 0.450 int./0.450 exh. Can anyone plz help me?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 1993 TOYOTA TERCEL 1500cc Valve Seals Replaced now smokes much worse

You either have had the wrong valve seals installed, they are physically missing, or the valves are incorrect (too loose in the guides/stem too thin). The rocker arm seals will not contribute to your issue. If it did not have the oil smoke before you took the head off, the issue is with whatever the machine shop did. Valve seals have to fit TIGHT, or oil will go down the valve stem into the intake.
Take the head back to the machine shop & tell them to fix it. For free.

Posted on Sep 27, 2008

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SOURCE: losing power,tapping noise in valve cover. could

could be bad lifters or loose rocker arms, bad oil pump or low on oil, possible bad cam (but not likely)
first thing i would do is check your oil real low oil will cause this
if oil is fine check for oil pressure if oil pressure is low assume bad oil pump
if oil prssure looks good look for bad lifters or loose rocker arms

Posted on Mar 06, 2011

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Hi back again I need to know why I would not get any compression in 1 3 5 7 or 6 can anyone tell me why cause I just rebuilt the motor a1976 Chevy 350 can you help


Hi Pete:
The very first things that I would check would be:
- the rocker arm/valve clearances. If they are too tight the valves cannot seat and you will get zero compression.
- Camshaft timing - Make sure that #1 piston is at TDC when you align the timing dots.
Great old motors! They were my favorites when racing dirt track stock cars in the 70's.
Hope to hear back from you.
Cheers

Apr 08, 2016 | Cars & Trucks

1 Answer

79 model L48 sbc assumed stock heads and crank, converted to a two barrle throttle body. need a compatible hydraulic flat tappet camshaft recommendation? I have a melting MTC-1 camshaft in it and the guy I...


Most factory small block chevy heads can only take a .500 lift cam unless creative machine work has been done. By looking at the cam shaft card and using a degree wheel this will determine the out come performance and as a general rule for valve train geometry at mid lift of cam shaft the rocker arm should be 90 degrees to the rocker stud. if not a longer or shorter push rod is required . the cam card also gives the free length height of the valves with a closed pressure reading this very important for cam life and helps prevent valve float at high rpm's with full open valve spring pressure.

Nov 05, 2013 | Chevrolet Cars & Trucks

2 Answers

What are the torque measurements for the rocker arms and intake manafold?


2.2L Engine & 2.4L Engines
These engines are not equipped with rocker arms. The camshafts directly actuate the valves.

3.1L Engine & 3.4L Engines
When install or connect the check the following:
- Pushrods and the rocker arms. Torque the bolts to 24 ft. lbs. (32 Nm). - Rocker arm cover using a new gasket. Torque the rocker cover bolts to 89 inch lbs. (10 Nm).
- Heater bypass pipe. Torque the screw at the water pump to 106 inch lbs. (12 Nm), the bolt at the cylinder head corner to 18 ft. lbs. (25 Nm) and the nut to 18 ft. lbs. (25 Nm).


About the INTAKE MANIFOLD...
-
Intake manifold nuts and bolts and tighten to 89 inch lbs. (10 Nm)
- Pushrods and rocker arms. Torque the bolts to 89 inch lbs. (10 Nm) plus an additional 30 degree turn. - Lower intake manifold. Apply sealant to the threads of the bolts and torque the bolts to 115 inch lbs. (13 Nm).



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Exploded view of the upper and lower intake-3.1L & 3.4L engines


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Fig. Lower intake manifold tightening sequence-3.1L & 3.4L engines

Hope help.

May 04, 2010 | 2000 Pontiac Grand Am GT

1 Answer

Put head new head gaskets in now come to start it and i have spark and fuel and i have the firing order rite but it wont start it acts like its out of time??? I will get a backfire from time to time when...


I am not familiar with this engine, but, it sounds like the valve timing.
Have you fitted the correct camshafts to the correct place. I had a customer who had messed with his Jag, same kind of fault, turned out he had put the camshafts in the wrong position and head side.
Check the valve timing first, then remove the rocker covers and check those camshafts, this should help to find the problem.

Jan 27, 2010 | 2001 Chevrolet Lumina

1 Answer

The rocker arms keep breaking. I was wondering what could be causing this and how to permanently fix it. I have not had any problems with them until recently and now they seem to break every couple months.


Wear is usely the reason, I don't know how many miles you have on it, but you might be money ahead to buy a set of after market rockers arms from summit racing or someplace like that, there made out of heaver and stronger metal and not that much more in price than the stock pieces.

Apr 14, 2009 | 1998 Dodge Ram 1500 4WD

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