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09-03-2005, 01:56 PM
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#1 |
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Registered User
Join Date: Jul 2005
Location: Athens,AL
Posts: 53
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Valve Rattle???
Hey, I'm getting a rattlle on accelleration (hard, easy, doesn't matter) and when going up an incline. I'm running a stock 305 on 87 octane "liquid gold".
It is definitely a rattle, not a knock. Any suggestions? 
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09-03-2005, 02:02 PM
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#2 |
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Stepsides RULE
Join Date: Jul 2004
Location: Pineville, LA
Posts: 1,921
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For me, one or two things made my valves quit clattering during the summer. When I got the truck, I switched to Valvoline MaxLife oil rather than El-Crappo cheap stuff. 2, I went to the dealership and ordered the fresh air duct that goes from the air cleaner to the opening in the grill, cause mine was gone since long before I began driving it. Which did it, I don't know.
 But my valves quit clattering and they haven't clattered since.
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1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord |
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09-03-2005, 04:55 PM
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#3 |
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Registered User
Join Date: Jun 2005
Location: sc
Posts: 77
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check your timming. If you can retard it a little it will help significantlly(SP?) Also 89 or higher octane "liquid gold" would also help. But it doesn't cost to bump your timming back a little.
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86 c-10 383 w/ sportsman II heads comp 286h cam Edlbrock RPM Performer intake Holley 750 th350 w/2400 stall 3.73 gears with powertrax No-Slip posi unit. Just broken in good. Will get a 1/4 time this week. |
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09-03-2005, 07:43 PM
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#4 | |
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Stepsides RULE
Join Date: Jul 2004
Location: Pineville, LA
Posts: 1,921
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Quote:
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1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord |
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09-03-2005, 09:29 PM
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#5 |
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Registered User
Join Date: Oct 2003
Location: Chesapeake, VA
Posts: 724
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I've been wondering how well that MaxLife works. I've been running the regular Valvoline. I'm considering using Valvoline's MaxLife next time around. I do have 137,000 some odd miles and 19 years on this original engine.
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Semper Paratus |
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09-04-2005, 01:43 AM
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#6 |
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Stepsides RULE
Join Date: Jul 2004
Location: Pineville, LA
Posts: 1,921
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MaxLife works great for me. I really think that is what elliminated my valve clatter. I don't really got any other big "oh wow it made $100 bills fart outta the exhaust" stories, but the truck runs very well with it in it and of course the elimination of the clatter.
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1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord |
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09-04-2005, 02:38 PM
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#7 |
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Registered User
Join Date: Jul 2005
Location: Athens,AL
Posts: 53
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Thanks alot Guys,
I'm sure this info will help. Any suggestions on a starting point (how many degrees) to retard the timing? I'll try the oil too, but my fresh air duct is in good shape. Would "Octane Boost" or = help? Thanks again! 
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09-04-2005, 05:31 PM
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#8 |
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Registered User
Join Date: Jun 2005
Location: sc
Posts: 77
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First of all I would check your timming and see where it is at. With vacuum advance disconnected and pluged. Compare that with what the engine specs call far. If it is high at all I would bring it down to where the manufacturer suggests. (this should quiet down the rattling) If is is already correct, you could lower it a couple of degreese but you will notice a powerloss.... 89 octane would probably take care of it though. I would not buy octane booster b/c it only raises your level about .5 octane so IMO you would be better off to take that money and use it toward 89 or 93 octane.
Is your engine computerized?(1987 or up) If not I would check the timing and if it is 8 degreese or more BTDC I would bring it down to around 4. However if you are worried about loosing power you'd be better off to go with the gas. Jeremy
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86 c-10 383 w/ sportsman II heads comp 286h cam Edlbrock RPM Performer intake Holley 750 th350 w/2400 stall 3.73 gears with powertrax No-Slip posi unit. Just broken in good. Will get a 1/4 time this week. Last edited by red86chevy; 09-04-2005 at 05:34 PM. |
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