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By blocky - 5 Years Ago
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hi i am looking for a bit of info ,first up 272 y block front main bolts.i have removed the sump on some untouched engines and found the front main cap bolts are different to the others and do not have spring washers. is this normal or have i got some strange engines? secondly on one of the y block sites the guy mentions drilling a small hole under the cam area for oil to go to the timing chain , does this reduce oil pressure to the front main???
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By darrell - 5 Years Ago
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on early engines the front bolts used washers.you cant use them on the rear as the rear seal holder will not clear.i wouldnt drill the hole myself but the hole is small and doesnt hurt oil pressure.
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By blocky - 5 Years Ago
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thanks for the clues cheers
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By miker - 5 Years Ago
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As I understand it, oil to the timing chain and the distributor gear is supplied from the overflow tubes from the rocker arm shafts. There’s been many discussions about pressurizing the shafts, restricting the tubes without blocking etc. Drilling into an oil passage is a new one for me, it’ll be interesting to see how Ted, John, and the other well known builders respond.
Modification to the center cam bearing, or bore, or groove in the camshaft to feed oil to the rockers is another highly discussed topic.
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By MoonShadow - 5 Years Ago
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The drilling is simply drilling a hole from the lifter valley out the front of the block. It allows a little of the oil collected in the valley area to drip down onto the timing chain. It's one of those "cant hurt" things. A lot depends on how you intend to use the car. For stock, everyday driving it probably isn't needed.
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By charliemccraney - 5 Years Ago
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Early engines were drilled and had a trough to direct the oil to the chain. I can try to hunt a picture down later. Someone else may have one handy.
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By blocky - 5 Years Ago
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i got that info from the y block guy i think his name is McMaster
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By blocky - 5 Years Ago
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i think the hole is drilled into the feed from number one main to front cam bearing and must squirt a small amount out??
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By stuey - 5 Years Ago
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http://yblockguy.com/techtips/oiling_mods.html
stuey
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By Ted - 5 Years Ago
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And here’s a post that Tim made to this forum showing the timing chain oiling modification.
http://forums.y-blocksforever.com/FindPost24720.aspx
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By blocky - 5 Years Ago
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thank you one and all for your help
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