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Hello all. Something about the valve assembly on my 261 doesn't look right. I bought this engine to rebuild.
Serial number: none. Not ground off, just blank. Engine block: 3769925 date: C307 (No 3679925 casting in 1957. 67' replacement block?)
Head: 3836850 Date: 14G2
The rockers have the oil groove on the middle (57 style) but has the pinched off oil connector (59-62 style). Additionally, a lead ball is jammed into the oil connector at the bottom. Why?
This engine has been rebuilt at some point in the past due to obvious signs. One of the springs on the rocker shaft was missing (small spring in the middle) which lead to the rocker getting beaten up.
Is the rocker shaft as transplant? What is going on with this thing. Thanks!
There is a member on this forum Pre ‘68 Dave, that has a good write-up about the different rocker oil supply systems that Chevy used on the 235/261 engines that may help you figure out your mystery. Here’s a [LINK] [chev235guy.blogspot.com]
Phil
1952 Chevrolet 3100 Project Journals ‘59 235 & hydraulic lifters “Three on the Tree” & 4:11 torque tube 12v w/ Alternator
There is a member on this forum Pre ‘68 Dave, that has a good write-up about the different rocker oil supply systems that Chevy used on the 235/261 engines that may help you figure out your mystery. Here’s a [LINK] [chev235guy.blogspot.com]
As Phil posted - Dave's write-up is excellent and is very helpful.
Could you also post a picture of the casting code on the head and better picture on the date code on the head or just tell us what it is. From your picture it looks like 14C2 or 14G2.
Phil
1952 Chevrolet 3100 Project Journals ‘59 235 & hydraulic lifters “Three on the Tree” & 4:11 torque tube 12v w/ Alternator
The lead plug has no hole. It is completely blocked. The block does has the oil tube behind the side cover. Thanks for the links. I checked out both sites before I posted. Still confused as the lead plug.
Per my initial post: Head: 3836850 Date: 14G2 both the date code and the casting number of the head are under the valve cover. THe date code is on the left, the casting number (3836850) is on the right.
If you look at the "6" in the casting number, look straight down and you'll notice the faint outline of a "T" outside the valve cover. I'm assuming it means Truck.
My bottom line question is: What rockers to use with this configuration. Pre 57 or 58-62.
I'll try to get a pic of the side of the block later.
Neptune Green55 Maybe your rockers are mixed -up in location read the manuel,also look for wear on stems and rockers. older valve refacers had fixtures to dress the rockers.
