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368 Lincoln Build

Posted By martyk98 6 Years Ago
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martyk98
Posted 5 Years Ago
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It's been too long since the grind, sorry, no card. As far as the exhaust numbers go, we have them at 116/65, just a little off from stock. We didn't go 100% on checking every cylinder. Once Jeff found the large discrepancy he knew where the problem was and pulled the cam. Stock grind going in. I was hoping for a few more ponies but I guess I'll have to settle for my amateur porting job. The last heads I did for my 56 Mark II came out great.  These are Merc heads and had a little more casting to get rid of. Maybe it was just the supplier that was different, who knows. Uh-oh, you say, what did that knucklehead do to the heads?  Not to worry, just made the gaskets and the holes match up on the intakes and exhausts.  I know that sanding down the runners smooth only works best for high RPM builds.
RB
Posted 5 Years Ago
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If you could post a copy of the cam card sent back from the grinder that would be helpful..
Ted
Posted 5 Years Ago
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Total agreement on the numbers being out of whack.  What were the lobe lifts when those numbers were being recorded?  As a general rule, lobe lifts are checked at 0.006" for hydraulic camshafts and 0.020" for solid lifter camshafts.  I’m assuming that the exhaust is opening at 118° BBDC and closing at 62° ATDC?  If that’s correct, then the duration for the exhaust is 360° while the duration for the intake is 344°.  360° is a full revolution of the crankshaft.  If that 118 number you posted is 118° ATDC, then the exhaust is actually opening at 62° BBDC which would make more sense.  Without clarification on the numbers, the problem lies with both the intake and exhaust lobes.  Did you check the lobes on a cylinder on the opposite bank as there’s also the potential for the camshaft to be ground on the incorrect lifter bank angle which just compounds the problem.

Lorena, Texas (South of Waco)


martyk98
Posted 5 Years Ago
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It appears the intake is the problem.  It opens at 36 degrees BTDC and closes at 144 degrees ABDC. Exhaust is opening at 118 degrees and closing at 62.
Oldmics
Posted 5 Years Ago
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I"d like to see the numbers. I assume these are the numbers you came up with while degreeing in the cam?

Its hard to fathom that a reground stick could be that wacked out ?

Oldmics
martyk98
Posted 5 Years Ago
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They turned the two I gave them around  in short order. Got them back yesterday. Not even a week. Between the two of them, I'm sure we'll be able to get rolling again soon on our project. Still looking for anyone with a lead on Weber linkage to handle the four we're putting on this thing.
RB
Posted 5 Years Ago
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I have worked with Oregon Cams and Delta cams up in that area.. Both seemed to do good work.. In fact I think Delta still has one of my cams for repair
martyk98
Posted 5 Years Ago
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Puyallup, WA, a small town just SE of Tacoma.  It's not us, it's the cam. I'm taking the blame for not getting the specs of what I wanted to the cam guy and just let him go on his own.
RB
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By the way, where are you guys located?
RB
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Boy that's a new one on me, a regrind being that far off...  If you have never read up on degreeing in a cam it might be worth it to do that on your next install..Good luck...


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