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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jun 2009 Posts: 235 'Bolter | | 'Bolter Joined: Jun 2009 Posts: 235 | I know there's a lot of debate on this topic as to whether or not it's even worth it. I have a question about the diagram though for anyone who's done it. Hole 'C' is where the oil returns to the oil Gallery. They say to drill hole D for a pressure gauge. I'm a little confused, since both those holes would be in the same rail, and if that's where the oil returns, then how would there be pressure in that oil gallery for a pressure gauge? Probably a stupid question, I just can't wrap my head around it. I kind of figure oil pressure should come where the oil comes out of. But again, maybe somebody can explain it to me simply. Thank you in advance. Here's the link to the website for inliners: http://www.inliners.org/tech/fullflow2.html
'53 Chevy 3604 Five Window Cab ('56 235)
| | | | | Joined: Feb 2004 Posts: 29,780 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,780 | The original passage is plugged as it connects to the oil pump output. That makes the entire long gallery pressurized, so anywhere along that raised area of the block will have the same output pressure as the pump, just downstream of the filter. The outlet fitting of the filter adapter before the line goes into the block could also be T'd off for an oil pressure gauge. Anywhere upstream of the main and cam bearings should show the same pressure reading.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Jun 2003 Posts: 565 'Bolter | | 'Bolter Joined: Jun 2003 Posts: 565 | Holes C and D are in the pressurized main oil galley fed by the oil pump.
A and B are in the return.
Look at the picture again.
"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."
1957 GMC 150
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