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Username Post: Piston question?        (Topic#341795)
100 CHEVY 
Dedicated Enthusiast
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100 CHEVY
Loc: Helena,Missippi,U.S.A.
Reg: 12-09-04
01-09-17 04:54 PM - Post#2670341    

I have a brand new set of stock,flat-top 350 pistons.
Will they fit/work in a 327?
I can't remember.
Mike.

"You gonna leave it like that?
http://www.picturetrail.com/100chevy


 




Rick_L 
Honored Member
Posts: 27004
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
01-09-17 05:22 PM - Post#2670352    
    In response to 100 CHEVY

No, because the piston pin location is in a different place on a 327 vs. a 350.

This is because of the difference in stroke. A 350 has 3.48" stroke, and a 327 has 3.25". The difference in pin location is half the difference in the stroke. (3.48" - 3.25")/2 = 0.115"

Typical pin height on a 327 is 1.675". Typical pin height on a 350 is 1.560". Rebuilder pistons for either may be .020" lower.



 
100 CHEVY 
Dedicated Enthusiast
Posts: 6087
100 CHEVY
Loc: Helena,Missippi,U.S.A.
Reg: 12-09-04
01-09-17 06:03 PM - Post#2670355    
    In response to Rick_L

Thanks Rick!
I just had these for a 350 already.
Looks like I need to buy some new pistons for the 327.
I'm replacing the pop-ups that are in it now with stock pistons.
Mike.

"You gonna leave it like that?
http://www.picturetrail.com/100chevy


 
busterrm 
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Posts: 1215
busterrm
Loc: Wichita Falls, Tx
Reg: 08-30-10
01-11-17 09:15 AM - Post#2670575    
    In response to 100 CHEVY

Find out the pin location. You could use 5.85 inch rods and maybe a thicker head gasket to get quench right. A stock piston would be .010 out of the bore and need a gasket that amount thicker for your quench. A re builder piston if its .020 shorter pin location would be .010 in the bore and need a gasket according to that. Just a suggestion. Of course this is assuming your block is standard deck height.

==== BOB ====
If I can't smoke the tires I want more!

1976 Chevy Nova
2007 Chevy 1500 1/2 ton
2008 Harley Davidson XL1200 Sportster


Edited by busterrm on 01-11-17 09:16 AM. Reason for edit: No reason given.

 
56sedandelivery 
Valued Contributor
Posts: 4937
56sedandelivery
Age: 65
Loc: Everett, Wa.
Reg: 02-26-08
01-11-17 12:48 PM - Post#2670594    
    In response to busterrm

Sent you a Private Topic. Small or medium journal 327? Medium journal you could just use a 350 crank, your rods, and your 350 pistons; wind up with more cubic inches. Just a thought.
I am Butch/56sedandelivery.




 
100 CHEVY 
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100 CHEVY
Loc: Helena,Missippi,U.S.A.
Reg: 12-09-04
01-11-17 03:14 PM - Post#2670616    
    In response to 56sedandelivery

My block,by my measurements is 4".It hasn't been decked (yet).
I'm just going for stock 275/300 hp.Basic rebuild.
Got your pm Butch-thanks!
Mike.

"You gonna leave it like that?
http://www.picturetrail.com/100chevy


 
busterrm 
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busterrm
Loc: Wichita Falls, Tx
Reg: 08-30-10
01-13-17 04:17 PM - Post#2671002    
    In response to 100 CHEVY

Not a bad idea, some of the early 350s were small journal cranks.

==== BOB ====
If I can't smoke the tires I want more!

1976 Chevy Nova
2007 Chevy 1500 1/2 ton
2008 Harley Davidson XL1200 Sportster


 
models916 
Valued Contributor
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Age: 65
Loc: Addison, IL
Reg: 05-28-10
01-16-17 04:52 AM - Post#2671505    
    In response to busterrm

All 350 were the larger size. Anybody?

http://www.mortec.com/journal.htm





 
LUVmachine 
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LUVmachine
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Loc: Redding Ca
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01-16-17 08:15 AM - Post#2671538    
    In response to models916

  • Quote:
Not a bad idea, some of the early 350s were small journal cranks.



I thought it was the late 327s had the same crank journal as the 350 not the other way around.

71 C-10 454 with weiand 177
72 406 sbc powered Chevy LUV sleeper (SOLD)
2010 GMC Sierra crew cab 4X4
http://s626.photobucket.com/user/GJohnson81/libra r...


 
Stinky 
Senior Member
Posts: 1488

Loc: Whitewater, CO
Reg: 05-25-01
01-16-17 09:52 AM - Post#2671564    
    In response to LUVmachine

Way back in my mind, that seems correct. I aint no expert by any stretch of the imagination.

But, according to Wiki...the 327 came out in '62, the 350 came out in 67, and in '68 they went to large journal (down at the bottom "Major Changes").

But, I think that 916 & LUV are correct...all 350s were large journal. Don't know though.

Put a caliper on it...



Edited by Stinky on 01-16-17 09:56 AM. Reason for edit: No reason given.

 
100 CHEVY 
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100 CHEVY
Loc: Helena,Missippi,U.S.A.
Reg: 12-09-04
01-16-17 10:56 AM - Post#2671587    
    In response to Stinky

The 327 I'm going to rebuild is a 66 small journal block.
I also have a 68,C-10 with the large journal 327 in it.Not sure why GM made this change in the 327's last year unless it was to save on manufacturing costs.
The large journal 327 doesn't seem as popular as the small journal 327's.
Mike.

"You gonna leave it like that?
http://www.picturetrail.com/100chevy


 
Rick_L 
Honored Member
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Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
01-16-17 11:03 AM - Post#2671588    
    In response to 100 CHEVY

69 was the last year of the 327.

A 68-69 327 block is totally interchangeable with either 302 or 350.

A 327 has a 3.25" stroke, which is shared with a 307. They did build 307s after 1969. So they didn't really build special pieces for just one or two years. Exception to that is a 327 large journal forged crankshaft, which was made only in 1968.

I am pretty sure that 1967 350s had a small journal block and crank.





 
jdk 
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jdk
Age: 67
Loc: columbus, ohio
Reg: 02-15-10
01-16-17 03:58 PM - Post#2671654    
    In response to Rick_L

i think one block was used for both
327 and 350. one or two years only. and over the counter replace. ce. of course i could be
wrong. jim



 
65_Impala 
Very Senior Member
Posts: 3635

Reg: 12-29-02
01-17-17 10:34 AM - Post#2671823    
    In response to models916

  • models916 Said:
All 350 were the larger size. Anybody?

http://www.mortec.com/journal.htm






I would agree. All 350's only had 2.45" main and 2.10" rod journals.

The best place to find "proof" of small journal 350's is by searching for unsubstantiated stories about how someone found one in an engine. Of course, the story is about a car with 20+ years of unknown history but the engine is still unmolested and original, never even having a valve cover taken off before let alone being rebuilt.





 
LUVmachine 
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LUVmachine
Age: 35
Loc: Redding Ca
Reg: 10-02-14
01-17-17 11:57 AM - Post#2671840    
    In response to 65_Impala

I was waiting for someone to recommend putting in a 350 crank so the OP could use his 350 Pistons.

71 C-10 454 with weiand 177
72 406 sbc powered Chevy LUV sleeper (SOLD)
2010 GMC Sierra crew cab 4X4
http://s626.photobucket.com/user/GJohnson81/libra r...


 
65_Impala 
Very Senior Member
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Reg: 12-29-02
01-17-17 05:56 PM - Post#2671900    
    In response to LUVmachine

You missed it. It was already done.



 
busterrm 
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busterrm
Loc: Wichita Falls, Tx
Reg: 08-30-10
01-17-17 10:16 PM - Post#2671942    
    In response to LUVmachine

  • LUVmachine Said:
  • Quote:
Not a bad idea, some of the early 350s were small journal cranks.



I thought it was the late 327s had the same crank journal as the 350 not the other way around.

I thought the same, but a friend had 2 or 3 350s with small journal. Helped him rebuild one. They were all 1967 date codes. A friend of his father worked for GM back in 67, he said chevy made about 250-300 small journal 350s. Just repeating what I was told.

==== BOB ====
If I can't smoke the tires I want more!

1976 Chevy Nova
2007 Chevy 1500 1/2 ton
2008 Harley Davidson XL1200 Sportster


 
models916 
Valued Contributor
Posts: 4417

Age: 65
Loc: Addison, IL
Reg: 05-28-10
01-18-17 05:30 AM - Post#2671965    
    In response to busterrm

Funny there is a GM part number for every crank they ever made except THAT ONE.



 
4dr 57 
"9th Year" Silver Supporting Member
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4dr 57
Loc: Texas Hill Country
Reg: 11-10-04
01-19-17 04:53 PM - Post#2672328    
    In response to models916

At one time I had a 68, 327 truck motor that had a large main bearings.
Interesting Rick_!

It's all good. mostly




 
models916 
Valued Contributor
Posts: 4417

Age: 65
Loc: Addison, IL
Reg: 05-28-10
01-20-17 04:33 AM - Post#2672403    
    In response to 4dr 57

It's the 350 stroke small diameter that needs a part number.



 
65_Impala 
Very Senior Member
Posts: 3635

Reg: 12-29-02
01-20-17 06:58 AM - Post#2672420    
    In response to models916

Yes, provide some kind of actual documented proof it exists besides "I owned" or "my buddy owned" stories about it.



 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 16896
grumpyvette
Age: 69
Loc: FLORIDA USA
Reg: 03-16-01
01-20-17 07:59 AM - Post#2672431    
    In response to 65_Impala

Id point out that any decent machine shop could and some most likely have turned down the crank main journal sizes to fit a block that has a smaller bearing size.
(like the 400 cranks with 2.65" journals were in 350 blocks for 2.45" bearings on the original 383 combos)


IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 01-20-17 08:00 AM. Reason for edit: No reason given.

 




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