Need some cam info on a 327 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

soulman67 · 09-08-2006, 07:44 PM

I recently bought a 67 lwb C10 from a windowed lady. It was her husbands truck that he had owned since new. I spent the last couple of day looking up casting number and vin numbers. The 327 in the truck was a bought crate motor from GM in 68, the block was the same one used as the vette 327 FI 375hp. The engine is beefy for a 2 bolt main the mains are hugh and so are the conecting rods with large bolts.

But I am having trouble looking up the cam info the only numbers on it are 6930X it is a gm cam. The lifts are .347" which are larger than the L-79 350hp cams. My guess is this cam is a police model if there is such a thing cause the orginal owner of the truck was a Kansas State Game Warden.

Now I do I find out what the valve lift would be so I can find a replacement cam all the cataloges list vavle lift and not lobe lift.

*trkklr77* · 09-08-2006, 09:51 PM

put a dial indicator on the rocker, over the valve or over the pushrod and cycle it.

Green Machine · 09-08-2006, 10:36 PM

Valve lift is 1.5 rocker arm ratio time lobe lift, so valve lift divided by 1.5 = cam lobe lift. Hope that helps.

lilpup69chevy · 09-08-2006, 10:37 PM

yeah but wouldn't it be kinda hard to read the lobes if the camshaft is wore???

soulman67 · 09-09-2006, 12:14 AM

woren lobes are not worth reading but most of the lobes look good my cams lobe lift is .347 on a majority of the lobes there are few wore down to .323 The truck only has 60K on it, but the motor was left with the valve covers and timing cover off since 2004. So I am rebuilding it.

soulman67 · 09-09-2006, 12:39 AM

with the 1.5 ratio I am looking at somewhere around .520 valve lift. That quit a bit, it also will explain for the old school traction system. The piece of railroad iron(track) bolted to the frame behind rear bumper with a 1" thick strap welding arcoss the top of that. Which is going to be alot of fun to remove, but will make one hell of a anvil.

09-08-2006, 07:44 PM	#1
soulman67 Randy churchill Join Date: Apr 2003 Location: Pearsall, Tx Posts: 356	Need some cam info on a 327 I recently bought a 67 lwb C10 from a windowed lady. It was her husbands truck that he had owned since new. I spent the last couple of day looking up casting number and vin numbers. The 327 in the truck was a bought crate motor from GM in 68, the block was the same one used as the vette 327 FI 375hp. The engine is beefy for a 2 bolt main the mains are hugh and so are the conecting rods with large bolts. But I am having trouble looking up the cam info the only numbers on it are 6930X it is a gm cam. The lifts are .347" which are larger than the L-79 350hp cams. My guess is this cam is a police model if there is such a thing cause the orginal owner of the truck was a Kansas State Game Warden. Now I do I find out what the valve lift would be so I can find a replacement cam all the cataloges list vavle lift and not lobe lift. __________________ 1983 GMC K2500 6.2 diesel 4" lift on 35x12.50 tires 2008 GMC 2500HD 6.6 diesel 3" lift on 315 75 16X10 2003 Jeep Rubicon 4.5" short arm lift 1985 Jeep CJ7 30k in parts and still adding up

09-08-2006, 09:51 PM	#2
trkklr77 Account Suspended Join Date: Aug 2006 Location: vacaville ca, because it as far from indy as i can be Posts: 775	Re: Need some cam info on a 327 put a dial indicator on the rocker, over the valve or over the pushrod and cycle it.

09-08-2006, 10:36 PM	#3
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: Need some cam info on a 327 Valve lift is 1.5 rocker arm ratio time lobe lift, so valve lift divided by 1.5 = cam lobe lift. Hope that helps. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

09-08-2006, 10:37 PM	#4
lilpup69chevy 67-72 parts finder Join Date: Aug 2006 Location: southeast mo Posts: 788	Re: Need some cam info on a 327 yeah but wouldn't it be kinda hard to read the lobes if the camshaft is wore??? __________________ 1969 chevy shortstep 2wd (under construction) 1981 chevy scottsdale lwb 2wd (parts chaser) 2004 pontiac gto (daily driver) 2004 pontiac grand prix gt (the ol ladys car) 1985 chevy short wide 1970 chevy c10 lwb (another parts rig) 1969 gmc lwb (rainy day project) 1968 chevy lwb c10 250 I6 3 spd (soon to be swb)

09-09-2006, 12:14 AM	#5
soulman67 Randy churchill Join Date: Apr 2003 Location: Pearsall, Tx Posts: 356	Re: Need some cam info on a 327 woren lobes are not worth reading but most of the lobes look good my cams lobe lift is .347 on a majority of the lobes there are few wore down to .323 The truck only has 60K on it, but the motor was left with the valve covers and timing cover off since 2004. So I am rebuilding it. __________________ 1983 GMC K2500 6.2 diesel 4" lift on 35x12.50 tires 2008 GMC 2500HD 6.6 diesel 3" lift on 315 75 16X10 2003 Jeep Rubicon 4.5" short arm lift 1985 Jeep CJ7 30k in parts and still adding up

09-09-2006, 12:39 AM	#6
soulman67 Randy churchill Join Date: Apr 2003 Location: Pearsall, Tx Posts: 356	Re: Need some cam info on a 327 with the 1.5 ratio I am looking at somewhere around .520 valve lift. That quit a bit, it also will explain for the old school traction system. The piece of railroad iron(track) bolted to the frame behind rear bumper with a 1" thick strap welding arcoss the top of that. Which is going to be alot of fun to remove, but will make one hell of a anvil. __________________ 1983 GMC K2500 6.2 diesel 4" lift on 35x12.50 tires 2008 GMC 2500HD 6.6 diesel 3" lift on 315 75 16X10 2003 Jeep Rubicon 4.5" short arm lift 1985 Jeep CJ7 30k in parts and still adding up



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