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Old 12-03-2003, 09:02 PM
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checking oil flow in sb block?

I have took the three plugs out of the front and back of the block,and blowed threw them ,and threw all of the other oil holes, is there away for the machine shop tp check it out for me to make sure my cam is getting enoufe oil. i have checked the cam bearnings and they are in right. should i replace the oil filer adaptor? any help would be great...thanks robbie

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Old 12-03-2003, 09:20 PM
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First off, what is the problem that caused you to take the engine apart?

As far as the oil passages go, the machine shop will vat ( dip and clean ) the block, then run a long wire brush through all the passages to clean out any sludge, then re-vat the block again.
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Old 12-03-2003, 09:54 PM
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In response to you earlier posting about cam failure, you said it was lobe three and four, I will assume this is counting from the front. A major oil path exist there to return the oil coming from the heads to the pan. 90% of the lifter oiling comes from the splash produced by this stream of oil returning from the heads. Not from the galley that exist's to keep the lifters pumped up. I think you need to take a good look at the area forward in the block and see if you can find some casting flash or the like preventing oil from returning to the pan at that point. Remember that oil returns all along the cam and it's job is to help cool that area to prevent galling of the cam bearings. To much work done to the oil return holes at either end of the valley will prevent enough oil to splash the cam and result in cam failure, I however, don't see this as the culprit. Possibly the problem exists in the heads. If the front return hole is plugged or heads are not getting enough oil to the rocker and valves then no oil will exist at the return hole and this would also result in cam failure.

Ensure you have the correct lifter as well. If the lifters were machined badly they might be able to fall out the bottom of the lifter bore and get jammed between the cam lobe and lifter bore.(had this happen to me once). Also take a look at the clearances at the push rod guide and stacking of the coils as well as guide to retainer interference. TAKE nothing for granted and measure everything, even if it seems stupid. You will find it eventually.
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Old 12-03-2003, 11:46 PM
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I still say check the oil passages in the lifter bores. This is the major part that puts oil in and over the lifters and each lobe. If you've at least got the intake off this isnt hard to do, just lift out the lifters and run a long wire brush through the passages.
Have you even checked to see if there was oil squirting out those pushrods when the engine was together? That would be a dead give away.
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Old 12-04-2003, 01:34 PM
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my block--and heades

well first i want to think everyone that has responded to my problem with my small block, someone asked on here were did the problem start, well it started after i built my engine and it wiped out the lobes between 3-4 cyl. after about 20 minutes of starting it and breaking in the cam ,i didnt let it idel at one speed,i went up-down like i have all ways have. as far as the cam goes, the lifters came with the cam. im changing my heads and getting 64cc sportsman-II heads that has a max lift of 560 and my cam will be close to that ,so it all should work right. once again thanks robbie
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