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Re: 1937 216 rebuild [Re: John Dlugos] #1341908 Mon Jan 13 2020 05:18 PM
Joined: Dec 2019
Posts: 38
J
John Dlugos Offline OP
Wrench Fetcher
Thanks Dave that's what I wanted to hear.
Thanks for info Jerry.
Since the 39 short block is new old stock standard bore I'm thinking flat top aluminum standard pistons with a 42 head. This way I don't have to pay for a bore.
I like to do things right but I'm kinda cheap
What do you guys think, John


John
37 Chevy 1.5 ton
17 Dodge Brothers Roadster
23 Dodge Brothers Touring
23 Dodge Brothers Coupe
73 Plymouth Scamp 2 dr
Re: 1937 216 rebuild [Re: John Dlugos] #1341916 Mon Jan 13 2020 05:41 PM
Joined: Jan 2001
Posts: 4,876
P
Pre '68 Dave Online
Shop Shark
Sounds like a good plan.


See the USA in your vintage Chevrolet!
My Blog
Re: 1937 216 rebuild [Re: John Dlugos] #1341919 Mon Jan 13 2020 06:29 PM
Joined: Feb 2004
Posts: 19,637
H
Hotrod Lincoln Online
Boltergeist
Aluminum 216 pistons are pretty expensive. People give me good condition std. bore 235 pistons just to get them out of their way when they rebuild their engines, and I recycle them into 216 engine buildups. That usually makes the cost of a rebore job a moot point- - - -especially since I've got a couple of Van Norman boring bars and a "retired old man" work schedule!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 1937 216 rebuild [Re: John Dlugos] #1341928 Mon Jan 13 2020 07:05 PM
Joined: Dec 2019
Posts: 38
J
John Dlugos Offline OP
Wrench Fetcher
i will run that by my engine guy but if I don't have a source for good used pistons from 235 isn't the cost for 216 and 235 pistons about the same?
John


John
37 Chevy 1.5 ton
17 Dodge Brothers Roadster
23 Dodge Brothers Touring
23 Dodge Brothers Coupe
73 Plymouth Scamp 2 dr
Re: 1937 216 rebuild [Re: John Dlugos] #1341931 Mon Jan 13 2020 07:22 PM
Joined: Feb 2004
Posts: 19,637
H
Hotrod Lincoln Online
Boltergeist
About the only source I'm aware of for aluminum 216 pistons is Egge Machine, and they think they're made of gold, not aluminum alloy! Original equipment 216 pistons were cast iron. Try an ad in the "parts wanted" forum- - - -somebody's probably got some good used 235 pistons left over from an engine job gathering dust on a shelf somewhere.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 1937 216 rebuild [Re: John Dlugos] #1341948 Mon Jan 13 2020 08:45 PM
Joined: Jan 2001
Posts: 4,876
P
Pre '68 Dave Online
Shop Shark
Just so you know, a standard bore 216 would need to be bored .062” over for a standard bore 235 pistons.


See the USA in your vintage Chevrolet!
My Blog
Re: 1937 216 rebuild [Re: John Dlugos] #1341952 Mon Jan 13 2020 08:51 PM
Joined: Feb 2004
Posts: 19,637
H
Hotrod Lincoln Online
Boltergeist
Most machinists bore any cylinder to the diameter of the piston that's going into the hole, and put the skirt clearance in with a hone to eliminate the machining marks. The finish bore would end up 3 9/16" for a 235 Std. piston, with about .0025-.003" skirt clearance- - - -3.0625" final diameter, with the clearance built into the piston skirt. To do it accurately most good machinists insist on having the pistons on hand before they start whittling on the block, and fit each piston individually.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 1937 216 rebuild [Re: John Dlugos] #1341960 Mon Jan 13 2020 09:24 PM
Joined: Jan 2001
Posts: 4,876
P
Pre '68 Dave Online
Shop Shark
Actually 3.5625 to be accurate Jerry.


See the USA in your vintage Chevrolet!
My Blog
Re: 1937 216 rebuild [Re: John Dlugos] #1341963 Mon Jan 13 2020 09:27 PM
Joined: Jan 2001
Posts: 4,876
P
Pre '68 Dave Online
Shop Shark
Also, before using any used aluminum pistons, look very close at the ring lands/grooves for wear.


See the USA in your vintage Chevrolet!
My Blog
Re: 1937 216 rebuild [Re: John Dlugos] #1341980 Mon Jan 13 2020 10:03 PM
Joined: Jul 2014
Posts: 168
1
1Ton_tommy Offline
Shop Shark
Maybe I missed something but I thought OP said he had an NOS shortblock. If that's true what's the need for boring and pistons at all. There's a lot to be said for a stock bore and pistons not to mention the stock size rotating assembly. Basically all he'd have to do is come up with a properly aligned oil pan, pump and have the head rebuilt. What am I missing? I've been on pain meds from a kidney stone removal so that's certainly possible. Drink more water!


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
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