1981 6 cylinder Corvette.
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,307
Likes: 1
From: Milford Haven Pembrokeshire
1981 6 cylinder Corvette.
Have often said to friends that driving my vette home was an experience - mainly due to the chassis problems.
After they were cured and I could open it up a bit, told friends that 195 hp felt like just 95hp. Probably a blocked cat, etc.
However, when I was cleaning engine parts, I noticed a dished lifter. So, pulled the cam out of the trash bin and actually looked at it. 2 lobes wiped and a couple looking a bit worn.
This may also explain having to fill up with gas 3 times to get home.......
Well, it should be better after the rebuild !!!
Do cams often wipe at under 100k miles ??
After they were cured and I could open it up a bit, told friends that 195 hp felt like just 95hp. Probably a blocked cat, etc.
However, when I was cleaning engine parts, I noticed a dished lifter. So, pulled the cam out of the trash bin and actually looked at it. 2 lobes wiped and a couple looking a bit worn.
This may also explain having to fill up with gas 3 times to get home.......
Well, it should be better after the rebuild !!!
Do cams often wipe at under 100k miles ??
Instructor
Joined: Oct 2005
Posts: 143
Likes: 0
From: Independence MO
Cams
Gm had lots of cam troubles back in the late '70's abd early '80's. They would add valve spring pressure to help with performance and the heaver spring would put pressure on the cam and make it go flat. I had a 1979 Chevy pickup that kept running bad and I figured out the cam was going flat at around 56000 miles, just out of warrenty!! It would not hardly get up to 60 MPH when I was trying to get it home on the hiway. Changed the cam and lifters and it ran like new!! Bad cams can kill your performance!!
Instructor
Joined: Dec 2005
Posts: 196
Likes: 0
From: Burlington WI
It was the way thehardern the lopes. They ran induction thru every other
lobe hoping the middle one would be up to specs. I had a 66SS with 22,000 on that a lope wiped out. Very quick when it gets past the hardern surface. GM warrenty was to throw it in the pile of the rest
of cams in the back corner of the shop. I bought one from napa for
35.00
lobe hoping the middle one would be up to specs. I had a 66SS with 22,000 on that a lope wiped out. Very quick when it gets past the hardern surface. GM warrenty was to throw it in the pile of the rest
of cams in the back corner of the shop. I bought one from napa for
35.00
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Drifting
Joined: Nov 2004
Posts: 1,971
Likes: 7
From: Longwood Florida
I wiped a LOBE on a crane 280 hyd cam before. Car had a bad flat spot in the power curve about 4K rpms. I pulled the values covers and noticed the number 7 or 8 intake value was not moving up and down....
BUY A ROLLER CAM... OR SOLID ROLLER....
no more wiped LOBES
BUY A ROLLER CAM... OR SOLID ROLLER....
no more wiped LOBES
