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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#59039 04/11/2006 3:22 AM | Joined: Jan 2005 Posts: 112 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2005 Posts: 112 | My 66 model 300 hp 327 seems to lost its edge over the last 21 years or so. It idles eradic, and just does not have the crisp acceleration it once had. I was blaming it on the carb, but i do not think that is it. Maybe a flat cam? It doesn't "pop back" thru the carb, like i remember them to do( i worked in a cheverolet dealership during the mid 80s, during the heyday of the 305 cams). Any ideas?? | | |
#59040 04/11/2006 4:03 AM | Joined: Mar 2004 Posts: 3,068 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 3,068 | Timing chain, valve job, etc. Do the basic diagnostics and you'll know for sure. I would do a general check of the engines condition (compression test first) before throwing parts at it,
Scott | | |
#59041 04/11/2006 4:25 AM | Joined: Nov 2002 Posts: 1,002 Shop Shark | | Shop Shark Joined: Nov 2002 Posts: 1,002 | The cam in my 68 C20 with a 327 was bad when I bought the truck. After getting the carb to run right, it had been sitting for 5 years. I went to adjust the valves and it was obivious the cam was flat, as little as a 1/4 inch of movement on some of the valves. I had done a compression check on it and it wasn't great 110-130 about what I would expect for 116k on the motor. After changing the cam the compression even outand improved a bit 120-135. The truck ran like a top till about 2 months ago and a head cracked Ouch! You might just pull the valve covers, put a straight edge acros the valve springs (valve seat wear, start it up, set the idle down or turn it over by hand and check the minimum spring height.
Larry
I don't own a vehicle that isn't old enough to drink.
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#59042 04/12/2006 6:18 PM | Joined: Jun 2005 Posts: 887 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 887 | YOu can also use a dial indicator over the valve stems and crank the engine to see if you are getting the lift you should.
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
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