Unknown sound

[1974Blueflame]

Ok I was driving down the road then a knock possible misfire started happening I got it home found it was coming from the #7 cylinder I pulled the valve cover for that side and the rocker arm on the exhaust port of #7 cylinder does not sit on the push rod like all of the others the push rod does move when I wrench over the engine but there is still a knock any help would be super nice if I gotta take this thing a part possibly a lifter is ****** any body else dealt with this

 

[DoubleDingo]

Vortec heads? If so, self-aligning rockers? If yes to vortec, and no to self-aligning rockers, that's what you need.

At the very least say what engine it is, any modifications, enhancements, or lack thereof. We need more info, and pics dang it, post up pics of the offending problem

 

[DoubleDingo]

Test

Sticky

NOPE, not "STICKY", op probably wrote "effed"

 

[1974Blueflame]

Vortec heads? If so, self-aligning rockers? If yes to vortec, and no to self-aligning rockers, that's what you need.

At the very least say what engine it is, any modifications, enhancements, or lack thereof. We need more info, and pics dang it, post up pics of the offending problem

These are the exact engine specs for this
Engine Specifications:
• HP: 330
• TQ: 380
• Block: OE block 4 bolt main 1pc seal 1987-2000
• Bore/Stroke: 4.040 x 3.480
• Displacement: 350
• Crankshaft: OE Reground external balance rear of crank/internal balance front of the crank
• Rods: OE powder metal 5.7”
• Pistons: Hypereutectic 9.1:1 compression
• Rings: Moly
• Camshaft: Hyd. flat tappet
• Cam Specs: 224/234 @50 .465in/.488ex 112LSA
• Timing Chain: Double roller
• Cylinder Heads: ATK cast iron 76cc/165cc 1.94/1.50
• Rocker Arms: Stamped steel 1.5 ratio
• Oil Pan: Rear sump 5qt (not for Chevelles with steering behind crossmember, some corvettes and 62-67 chevy II’s)
• Oil Pump: Melling high volume
• Balancer: Internal balance 8”
• Flexplate/Flywheel: Pioneer #FRA-159 external balance 168 tooth
• Intake Manifold: ATK dual plane intake
• Distributor: HEI (Iron gear)
• Water Pump: OE long pump
• Carburetor: Quick Fuel 670CFM vacuum secondaries with electric choke
• Fuel Pump: Mechanical
• Spark Plugs: Champion #RV12C
• Spark Plug Wires: 8mm

Engine Info:
• Oil: Conventional / Non Synthetic 10W30 with Comp Cam zinc additive #159 for first 3000 miles
• Oil Filter: Wix or K&N per application
• Timing: 34-36 Degrees
• Spark Plug Gap: .035”
• Firing Order: 18436572
• Octane: 91+
• Stall Converter: 2200-2500
• Exhaust: 1 5/8 Headers

 

[1974Blueflame]

Test

Sticky

NOPE, not "STICKY", op probably wrote "effed"

Yes effed

 

[Radiohead]

Test

Sticky

NOPE, not "STICKY", op probably wrote "effed"

I might if I was experiencing that.

Scratch that - I know I would.

 

[Radiohead]

I would suspect a wiped cam lobe knowing nothing else about it.

 

[DoubleDingo]

I asked about vortec heads because I encountered a similar situation, also #7. I didn't know it needed self-aligning rocker arms, or guide plates. The rocker rotated off the exhaust valve.

You said it still made the noise rotating by hand. Did the pushrods move up and down? I wouldn't run it until a thorough investigation was done

 

[1974Blueflame]

I would suspect a wiped cam lobe knowing nothing else about it.

I

I asked about vortec heads because I encountered a similar situation, also #7. I didn't know it needed self-aligning rocker arms, or guide plates. The rocker rotated off the exhaust valve.

You said it still made the noise rotating by hand. Did the pushrods move up and down? I wouldn't run it until a thorough investigation was done

m thinking possibly cam love is ****** or the lifter is stuck

 

[Ricko1966]

I

m thinking possibly cam love is ****** or the lifter is stuck

You can see if the cam lobe is wiped. See if number 7 valves open as far as number 5 valves. You can usually just Eyeball it. But a cheater trick is lay a business card up against the valve spring make a mark on the card with a pin to represent full open and full closed . Use your card to compare on your other valve. Are you sure you don't have a broken valve spring. You can hear them pop when you rotate the motor and they can cause a miss.