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Pushrod Length 235 PG Engine
#728397 Thu Mar 10 2011 12:13 AM
Joined: Mar 2010
Posts: 705
B
Curmudgeon
My first time posting.

1957 Chevy 235 PG engine sitting on engine cradle. Block: 3837004. Head: 3836848. Hydraulic lifters (maybe VL46 but not original).

I measured the pushrod length on my engine and they are 11 and 1/4 inches. If I am reading correctly, the 1929-57 Master Parts Catalog says 56-57 All 6 cyl have 11 and 13/32 inch pushrods (hydraulic and solid lifters the same length). Some of the rocker arm adjuster screws are about two rounds of thread remaining before being flush with the top of the lock nut. The engine was running before I bought it ($100). It has 3 bent pushrods but I suspect the 11 and 1/4 inch pushrods did not cause this problem but I really don't know. I've read other postings that point to sticking/worn rocker arms and/or valve guides. I would appreciate it if some of the more experienced folks could give me their opinion before I tear into the engine. I also wonder why the longer pushrods beginning in 1956. Thanks.

Re: Pushrod Length 235 PG Engine
buoymaker #728561 Thu Mar 10 2011 02:48 PM
Joined: Mar 2002
Posts: 9,119
'Bolter
It almost looks like you have ones from the 1952 PG.


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Re: Pushrod Length 235 PG Engine
truckernix #728571 Thu Mar 10 2011 03:27 PM
Joined: Apr 2005
Posts: 382
W
Shop Shark
Be sure you indeed have a '57 235. The lifters for that year only are different than the '55-'62 lifters. There is a date code on the block above the starter. It will have a letter followed by some numbers. For example F 14 7. Would translate into June 14, 1957. The same number is on the inside of the block wall near the crankshaft. You'll have to remove the oil pan to see that code.
That head you have "848" is the good one. Made '58-'62. Remove the valve cover to see the date code on the top of the head. That code translates similar to the block date code.

Re: Pushrod Length 235 PG Engine
buoymaker #728596 Thu Mar 10 2011 04:36 PM
Joined: Mar 2010
Posts: 705
B
Curmudgeon
The block date code is G2357 (July 23 1957) and the head date code is C2257 (March 22 1957). I slid a couple rocker arms over against the spring on the shaft. They didn't want to move at first. There is hard black build-up where the rockers run.

Re: Pushrod Length 235 PG Engine
buoymaker #728654 Thu Mar 10 2011 08:39 PM
Joined: Jan 2001
Posts: 5,145
P
'Bolter
The parts book seems to be a misprint.
I have a dozen sets of original 1953-62 235 hydraulic push rods and they are just over 11 and 1/4" (actually 11.287").
The 1950-52 push rods are 11.250" as the parts book states and they have a groove across the bottom face to vent trapped air from the lifter ( PICTURE ).



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Re: Pushrod Length 235 PG Engine
buoymaker #728679 Thu Mar 10 2011 10:55 PM
Joined: Mar 2010
Posts: 705
B
Curmudgeon
Pre'68Dave, thanks for the input. Okay, the lengths are the same. Now I wonder if there is some other difference like diameter or material composition. The Master Parts list shows a part number 3836260 for 1956-57 and (3835777) for 1950-55. I would not think Chevrolet created a new number for the same part.

Re: Pushrod Length 235 PG Engine
buoymaker #728691 Thu Mar 10 2011 11:44 PM
Joined: Jan 2001
Posts: 5,145
P
'Bolter
If you read the 1957 parts book correctly it says:
"1950-52 Pass with Power Glide 3835777", which is a hydraulic lifter engine.
"1953-55 W/PG, and 1956-57 ALL". 1953-55 W/PG is a hydraulic lifter engine, and 1956 started the shorter lifter that matches the length of the hydraulic lifter, so it uses the same push rod.
The 3835777 push rod is different mainly in that it is grooved across the bottom face (see link in above post). In 1953 they dropped the groove, thus a different part number.


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Re: Pushrod Length 235 PG Engine
buoymaker #728774 Fri Mar 11 2011 03:40 AM
Joined: Mar 2010
Posts: 705
B
Curmudgeon
Thanks again. You are correct. I was reading it that 50-52 and 53-55 were the same but they are not.

I'm going to straighten up the bent pushrods, clean up the rockers and replace the oil. Maybe I can get this old beast to fire-up.


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