Topic: Engine noise... can you decipher it?
in Forum: C3 Engines
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Former Member
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Toledo, OH - USA
Joined: 9/4/2002
Posts: 147
Vette(s): 1976 Stingray, L48 auto Buckskin/Buckskin Leather originally. Numbers matching.
I would have to vote on the rod knock side, but either way, it isn't good, or maybe it is cause you get to swap.
'76 L48 Auto
Project
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Former Member
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BRADENTON, FL - USA
Joined: 8/4/2002
Posts: 669
Vette(s): 1972 convertible 350 auto trans, delux int, air, ps, pb, t/t wheel, pw, 79,000 org miles Rare one year only color
that noise reminds me of when a friend of mine was looking at a 68 cuda about 25 years ago. the guy wanted $50 for it and it had a noise just like yours. my buddy ask me what i thought of it so i took it out on the road and wound it up to 80 mph for about 2-3 minutes. it stayed together so he bought it, we dropped the oil pan and found a real loose bearing. polished the crank with some 1000 paper and slipped in a new bearing. it ran for 2 more years then he sold it for $500
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Sounds like a rod knock on #6 cylinder 
EdelBrock Performer w/ 750 doub pumper,port/polished heads, triple cut valves w/4th cut down the throat of the exhaust valves, 286 Comp Magnum cam, 1.6 roller rockers, ball-peen pushrods w/guides, screw in rocker studs w/girdles, Comp double-roller chain, , hi-rise valves covers w/ spacer (needed for the girdles), Flowtech by Holley long-tube ceramic coated headers into Stage II pipes (no cats), chrome wire looms for the MSD 8.5 mm wires, MSD 50,000v coil kit w/advance springs, cap, rotor, module, steel-braided radiator,heater,vacuum hoses, Infinity Kappa 4x6 plates (dash), Sony Xplode 6 3/4" (rear), chrome T-stat housing, A-arm shields, B&M Hammerhead shifter
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Former Member
Send PM
Toledo, OH - USA
Joined: 9/4/2002
Posts: 147
Vette(s): 1976 Stingray, L48 auto Buckskin/Buckskin Leather originally. Numbers matching.
That is a great ear you've got Baca 
'76 L48 Auto
Project
|IMG|http://www.freewebs.com/privategod/Mine2a.JPG |/IMG|
Former Member
Send PM
BRADENTON, FL - USA
Joined: 8/4/2002
Posts: 669
Vette(s): 1972 convertible 350 auto trans, delux int, air, ps, pb, t/t wheel, pw, 79,000 org miles Rare one year only color
might be #6 but sounds like #5 to me 
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First impression is a Low end knock and a nasy one at that.I'm not proficcient enuff to tell from a recording but its fast and mean and definetely crank speed which makes it main or rod...sorry bro'
Lifetime Memberin Forum: C3 Engines
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