548 CI BBC Advice

General engine tech -- Drag Racing to Circle Track

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prairiehotrodder
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Re: 548 CI BBC Advice

Post by prairiehotrodder » Wed Nov 15, 2017 9:51 am

are those pictures both the same cam? The top one looks worse. The top picture looks like my lunati cam that i bought used and was in at least 3 different motors. My Straub cam i bought new and used for 3 seasons and came out looking nearly as good as the day i put it in. I'm not an expert but with the deeper groove on one side i'd say the lifter wheel must not be sitting square on the cam. Has your block had the lifter bores bushed ? Has your block ever been over heated?
Brian
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TBART1970
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Re: 548 CI BBC Advice

Post by TBART1970 » Wed Nov 15, 2017 7:04 pm

No overheat. No lifter bushings. bowtie block.
New cam then old cam.

prairiehotrodder
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Re: 548 CI BBC Advice

Post by prairiehotrodder » Wed Nov 15, 2017 7:35 pm

is that the only lobe that looks bad? Is it a billet cam?
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TBART1970
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Re: 548 CI BBC Advice

Post by TBART1970 » Wed Nov 15, 2017 8:12 pm

Billet cam, not sure how many look that way, looked in with my scope.

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Re: 548 CI BBC Advice

Post by TBART1970 » Fri Nov 17, 2017 12:36 pm

No suggestions?

Newold1
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Re: 548 CI BBC Advice

Post by Newold1 » Sat Nov 18, 2017 7:06 am

Based on the pic with the pencil pointing at the wear on the flank of the lobe, there is a definite problem.

That cam is not a billet in my opinion looking at the areas next to the lobe !!

Send these pics to Mike at CamKing and he will tell you exactly what your issues and fixes should be made.

Let him spec, and make your camshaft and follow his instructions on valve train match and I suspect your problems will be over.

Stop rowing your boat uphill against the currents, go with the flow! JMHO

racear2865
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Re: 548 CI BBC Advice

Post by racear2865 » Sat Nov 18, 2017 9:08 am

My opinion---Cam is not a Billet probably a SADI. Roller either locked up or skidding.
reed

TBART1970
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Re: 548 CI BBC Advice

Post by TBART1970 » Sat Nov 18, 2017 5:30 pm

Pencil is on old, cam not billet. New cam that is still in the engine is a billet solid roller.

Kbails
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Re: 548 CI BBC Advice

Post by Kbails » Sat Nov 18, 2017 6:19 pm

I would pull the intake . yank the lifters and take a better look befor you run it much more. could be a soft lobe? or a failing lifter possibly. i would autopsy asap.
Long Island, NY

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