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468 BBC oil pressure problems
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William Jones
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Joined: 30 Jan 2006
Posts: 820
Location: Lake city, FL
28456.50 points


1971 Ford Mustang

PostPosted: Tue Apr 21, 2015 2:22 pm    Post subject: Reply with quote

I need to take a pic of it. But basically the cam was run without a cam button by the original builder. It caused the edge of the lobe to be worn towards the balancer so when I installed it this time with .010 end play with the cam button the roller lifter doesn't sit flat on the cam face. The cam gear ate the front of the block the first time and this time ate the gear because it was softer than the block repair. What do you guys think is causing it, are you using the rear cam tunnel plug to keep the cam from walking back toward the distributor? I have built more than 20 Chevy's and have never had this problem.

I am lost with this thing because it's never happened to me before.

Bam

_________________
Take the horse out off the barn and let her RUN BABY RUN!!!!!

92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
03 Cobra Bone stock 12.42
68 Falcon 363ci 10.55@126 N/A
95 GT 363ci 11.08@118 N/A
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Paul P
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Joined: 15 Aug 2002
Posts: 2393
Location: Townsend, Mass.
81240.86 points


1971 Chevrolet Chevelle

PostPosted: Thu Apr 23, 2015 4:46 pm    Post subject: Reply with quote

They do make roller cam thrust bearings that go between the back of the cam gear and the block. What happened to the brass or copper thrust washer that was behind the gear? If it was a stocker double roller it might not have came with one. I am guessing there was nothing but gear and block playing here. Might be a bit too late to save this one.
_________________
2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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William Jones
Member


Joined: 30 Jan 2006
Posts: 820
Location: Lake city, FL
28456.50 points


1971 Ford Mustang

PostPosted: Thu Apr 23, 2015 9:42 pm    Post subject: Reply with quote

Yeah the first timing set had the Torrington bearing behind the gear but the a hole didn't use a cam button. The bearing was seized on the cam gear I assumed from slamming back and forth because of no button. Which also ate up the block. We had the block repaired when I rebuilt the whole thing and I installed a new timing set that had no bearing or thrust washer. This time around I told to spring for a billet timing set with the bearing. Got a call from Bullet cams about the cam they were trying to figure out how the lobes got lopsided
I told them the cam came to me like that and was made in 96 and supposedly in a Mudd truck. They are going to try and fix it.

Bam

_________________
Take the horse out off the barn and let her RUN BABY RUN!!!!!

92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
03 Cobra Bone stock 12.42
68 Falcon 363ci 10.55@126 N/A
95 GT 363ci 11.08@118 N/A
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af2
Member


Joined: 01 Sep 2003
Posts: 5557
Location: grassvalley, ca
71191.50 points


1933 Willys Coupe

PostPosted: Thu Apr 23, 2015 9:46 pm    Post subject: Reply with quote

William Jones wrote:
I need to take a pic of it. But basically the cam was run without a cam button by the original builder. It caused the edge of the lobe to be worn towards the balancer so when I installed it this time with .010 end play with the cam button the roller lifter doesn't sit flat on the cam face. The cam gear ate the front of the block the first time and this time ate the gear because it was softer than the block repair. What do you guys think is causing it, are you using the rear cam tunnel plug to keep the cam from walking back toward the distributor? I have built more than 20 Chevy's and have never had this problem.

I am lost with this thing because it's never happened to me before.

Bam


Never the tunnel plug..
For some reason the cam is getting loaded beyond normal.. High oil pressure is one reason.

The confusing thing is the fact you say the roller is not flat on the cam. That can't be unless you have a flat tappet cam OR the lifter bores are way the hell out of blue print and that could very well be. The BBC was notorious for that and a BHJ fixture would tell you in seconds.
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William Jones
Member


Joined: 30 Jan 2006
Posts: 820
Location: Lake city, FL
28456.50 points


1971 Ford Mustang

PostPosted: Thu Apr 23, 2015 9:58 pm    Post subject: Reply with quote

Bullet cams said lobes were lopsided which I already knew because you could look at it and tell. They are going to try and fix it. But that's why the roller doesn't sit flat all this crap over used junk he didn't want to replace. This time it will have the right parts if I have to pay for them for him.
_________________
Take the horse out off the barn and let her RUN BABY RUN!!!!!

92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
03 Cobra Bone stock 12.42
68 Falcon 363ci 10.55@126 N/A
95 GT 363ci 11.08@118 N/A
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Knarley Darley
Member


Joined: 22 Apr 2004
Posts: 1247

540230.26 points



PostPosted: Sun May 03, 2015 12:26 pm    Post subject: Reply with quote

What oil are you using? Brand, and weight?
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William Jones
Member


Joined: 30 Jan 2006
Posts: 820
Location: Lake city, FL
28456.50 points


1971 Ford Mustang

PostPosted: Wed May 06, 2015 3:57 pm    Post subject: Reply with quote

Rotella 15-40 the oil pressure cold was 65psi and 47psi hot idle.

Bam

_________________
Take the horse out off the barn and let her RUN BABY RUN!!!!!

92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
03 Cobra Bone stock 12.42
68 Falcon 363ci 10.55@126 N/A
95 GT 363ci 11.08@118 N/A
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View user's profile Send private message
William Jones
Member


Joined: 30 Jan 2006
Posts: 820
Location: Lake city, FL
28456.50 points


1971 Ford Mustang

PostPosted: Thu Jun 25, 2015 12:01 pm    Post subject: Reply with quote

Well she has been to the track a couple times since I put her back together and so far the oil filters have looked good has 8 passes on her and runs 6.80s at 100 MPH in the 1/8 pretty good for a 4000 lb pickup truck. Hopefully she is fixed this time for good.

Bam

_________________
Take the horse out off the barn and let her RUN BABY RUN!!!!!

92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
03 Cobra Bone stock 12.42
68 Falcon 363ci 10.55@126 N/A
95 GT 363ci 11.08@118 N/A
Back to top
View user's profile Send private message
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