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07-06-2006, 12:58 PM
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#1 |
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Registered User
Join Date: Dec 1999
Location: LEXINGTON,SC,USA
Posts: 208
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valve springs...
....can you change the springs on a factory chevy 5.7 roller motor......without removing the heads.
i have vortec heads and i used a to stiff of a spring , and i want to chg them to bee-hive's......any help.
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TIM  '71 CUSTOM C-10 torch red ,350 roller GM crate,3.73 GEARS, REAR 4"DROP SPRING, FRONT 2.5" DROP SPINDLE-1.5"lower spring, FRONT=17x8(4.5bs) W/265-60-17, BACK=17x9.5 (5bs)W/285-60-17, Vintage Air Sure Fit AC------NEVER ENDING PROJECT!! |
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07-06-2006, 01:03 PM
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#2 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,228
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Re: valve springs...
yes you can find a fitting that will screwinto the sparkplug hole and hook compressed air into it to hold the vavles in place the do it one cylider at a time this method does not hold any warrenty
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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07-06-2006, 04:09 PM
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#3 | |
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Registered User
Join Date: Dec 2004
Location: Arvada Colorado
Posts: 1,321
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Re: valve springs...
Quote:
The 'rope method': Take about 20 ft of clothesline (cotton) rope and do one cylinder at a time in firing order. Take out the plug and feed the rope into the cylinder. It will take a LOT! Then rotate the engine by hand until the rope compresses up to the valves. It will keep them in place. I used a lever type compressor and voila....6 hours later....no more valve seal problems. I like the air method but if for some reason you lose air pressure, the valve drops into the cylinder. With the rope method, no such problem. Just my 2 cents.
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Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet" |
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07-06-2006, 04:20 PM
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#4 |
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Next project: 1970 K10
Join Date: Feb 2004
Location: Fort Collins, Colo 80524
Posts: 6,685
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Re: valve springs...
Just be sure to have the piston at TDC. That way if you lose all of your air pressure, the valve won't fall all the way out of the guide.
When I was wrenching for a living, I made a little widget out of two air fittings and a 1/4 turn valve. Then I could crack the valve open just far enough to keep enough air in the cylinder to hold the valve up, but too much air on a loose motor would cause it to want to turn over.
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Bob 1970 Chevy K10 LWB "Goldie" 350/TH350 next project!! 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE |
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