Welcome to the THE H.A.M.B. forums.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

Go Back   THE H.A.M.B. > General Discussion > The Hokey Ass Message Board

Reply
 
Thread Tools Display Modes
Old 01-16-2007, 08:23 PM   #1
V8PunkRocket
FNG
 
Join Date: Oct 2006
Location: Altamonte Springs, FL, USA
Posts: 19
Question How to identify a 327

Hey everyone,

I'm looking at buying a 327 block I found for sale. The person selling it gave me the casting number, which is 3970010. According to Mortec.com, this engine could be a 302, a 327, or a 350. At first I was assuming that the 327 and 350 would have different cylinder bores, but I looked that up on the site and they both have 4.000" cylinder bores! (I don't know how accurate this website is, either)

So, how would I tell if what I am getting is a 327, or just another 350? (I don't want a 350, I know small blocks are over-done as it is, but at least a 327 is slightly less common)

I appreciate any info anyone has. Thanks!
__________________
1956 Bel Air 4 door sedan, or what's left of one
offline   Reply With Quote
Old 01-16-2007, 08:50 PM   #2
Orange54
Member
 
Orange54's Avatar
 
Join Date: Mar 2004
Location: Missouri
Posts: 850
Default Re: How to identify a 327

Quote:
Originally Posted by V8PunkRocket
Hey everyone,

I'm looking at buying a 327 block I found for sale. The person selling it gave me the casting number, which is 3970010. According to Mortec.com, this engine could be a 302, a 327, or a 350. At first I was assuming that the 327 and 350 would have different cylinder bores, but I looked that up on the site and they both have 4.000" cylinder bores! (I don't know how accurate this website is, either)

So, how would I tell if what I am getting is a 327, or just another 350? (I don't want a 350, I know small blocks are over-done as it is, but at least a 327 is slightly less common)

I appreciate any info anyone has. Thanks!
Is there a date stamping on the back of the block? Is there a stamping on the pad in front of where the passenger head goes?
__________________
29 Ford RPU
34 Ford Pickup
53 Chevrolet 3100
68 Roadrunner
offline   Reply With Quote
Old 01-16-2007, 08:54 PM   #3
Tony
Alliance Member
 
Tony's Avatar
 
Join Date: Dec 2002
Location: Rochester NY. USA.
Posts: 6,887
Default Re: How to identify a 327

Being an 010 block, it's a large journal and should be of the '68 ( either 67 or 68 was the first year for the large journal..can't remember right now) and newer vintage.
The only difference between the large journal 327 and 350's are the crank. Different stroke's per ci. They used the same block.

If you can check the casting number on the crank itself, it will tell you which one it is.. that is if the pan is off obviously
I have that same casting number mill in my 57 chevy. Mine was originally out of a 69 3/4 ton truck and is a 350.
__________________
WHO CARES!

"You are cordially invited to shit in your hat"
-Chili Phil-

Do you need a open 32 Ford registration for your display case?? I have a NY one perfect for framing! contact me.
offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 01-16-2007, 09:06 PM   #4
Ratmotor
Alliance Member
 
Ratmotor's Avatar
 
Join Date: Apr 2006
Location: Parry Sound Ontario Canada
Posts: 3,344
Default Re: How to identify a 327

An intake casting number as well as the head numbers would aid in deciphering what it is. I think its more likely to end up being a 350 but there is a slim chance....
offline   Reply With Quote
Old 01-16-2007, 09:12 PM   #5
Rand Man
Old School HAMBer
 
Rand Man's Avatar
 
Join Date: Aug 2004
Location: Rogers, Arkansas
Posts: 2,626
Default Re: How to identify a 327

Is it just a block? The 3.25" crank is what makes it a 327. Your block could be built with a 3.48 crank and then it would be a 350. If you put in a 3.00 crank, then you have a 302. If you put in a 3.75" crank it becomes a 383 (with a .030 overbore).
__________________
She's wearin' new colors and runnin' pretty good
I got four hundred horses tucked under the hood.
offline   Reply With Quote
Old 01-16-2007, 09:13 PM   #6
V8PunkRocket
FNG
 
Join Date: Oct 2006
Location: Altamonte Springs, FL, USA
Posts: 19
Default Re: How to identify a 327

I learn new things every day! I will email the seller and ask if he can give me the crank casting number. Unfortunately, the engine is minus the heads and intake. I'll also ask about the date stamping. Thanks for the suggestions and information.
__________________
1956 Bel Air 4 door sedan, or what's left of one
offline   Reply With Quote
Old 01-16-2007, 09:36 PM   #7
Flatbush
FNG
 
Flatbush's Avatar
 
Join Date: May 2006
Location: Denver, Colorado
Posts: 45
Default Re: How to identify a 327

68 was the first year for big journal,spin on filter and no vent in the rear of the block (for road draft tube or block mounted PCV) meaning you will have to vent it like any ol 350. Probably not the look you want. Big journal, 327 cranks are very, very rare.
offline   Reply With Quote
Old 01-16-2007, 09:40 PM   #8
Fat Hack
Old School HAMBer
 
Fat Hack's Avatar
 
Join Date: Nov 2002
Location: Detroit
Posts: 7,717
Default Re: How to identify a 327

If it's in a "rat rod"...then it's automatically either a 327 or a 283!!!

(Ha Ha...seriously, though...as Tony said, the crank is what will give it away in a "0010" block)
__________________
The 90s are the new 70s...I dig the 90s!
offline   Reply With Quote
Old 01-16-2007, 09:53 PM   #9
Ratmotor
Alliance Member
 
Ratmotor's Avatar
 
Join Date: Apr 2006
Location: Parry Sound Ontario Canada
Posts: 3,344
Default Re: How to identify a 327

Quote:
Originally Posted by Flatbush
68 was the first year for big journal,spin on filter and no vent in the rear of the block (for road draft tube or block mounted PCV) meaning you will have to vent it like any ol 350. Probably not the look you want. Big journal, 327 cranks are very, very rare.
Geez I can get my hands on 2 68 Chevys both 327 4 barrel cars.... just have to tow them away. By that I mean dig them out of where they sank in the dirt!
offline   Reply With Quote
Old 01-16-2007, 09:55 PM   #10
Gunny
Grenade Inspector
 
Gunny's Avatar
 
Join Date: Feb 2006
Location: Imperial,Mo.
Posts: 191
Default Re: How to identify a 327

the early 327 (the small jurnal jobbers) have the oil draft ( for pcv )casting in the rear behind the distributor hole..the later (large jurnal) was just like the 350 blocks ..hope this helps
Attached Thumbnails
Click image for larger version

Name:	327 small jornal.JPG
Views:	193
Size:	15.5 KB
ID:	265434  
offline   Reply With Quote
Old 01-16-2007, 10:14 PM   #11
HEATHEN
Old School HAMBer
 
Join Date: Nov 2005
Location: SIDNEY, NY
Posts: 7,607
Default Re: How to identify a 327

Quote:
Originally Posted by V8PunkRocket
I learn new things every day! I will email the seller and ask if he can give me the crank casting number. Unfortunately, the engine is minus the heads and intake. I'll also ask about the date stamping. Thanks for the suggestions and information.
If the heads are off, you can easily turn it over until a pistons is at BDC and measure the stroke.
offline   Reply With Quote
Old 01-17-2007, 08:36 AM   #12
Model A Vette
Member
 
Join Date: Mar 2002
Location: Central NJ, USA
Posts: 998
Default Re: How to identify a 327

If you want to make it a 327 you just use a 307 crank (same stroke as 327).
That block was pretty common as you found out on Mortec's site.
All the blocks with that casting number would have large journals, would have no cast in hole like Gunny's picture and spin-on filters.
Can you get the number/letter code stamped on the pad in front of the pass head? That would help narrow down what it was originally.
__________________
Ed
offline   Reply With Quote
Old 01-17-2007, 08:52 AM   #13
cosmo
Old School HAMBer
 
Join Date: Mar 2001
Location: South Elgin, IL. USA
Posts: 2,558
Default Re: How to identify a 327

For those reading this and wondering "why bother, build a 350 and call it anything..." I can tell you from experience that a 327 has a smoother 'feel' to it, and revs slightly faster than a 350.
I had a 327 in a '72 Camaro (it needed an engine, and I found a '68 327 out of a Caprice...), drove it both before (ratty 350) and after the swap, and liked the 327 better.
Oh, yeah, the Camaro was a four speed car, too. The 327 felt REAL good with the muncie.

Cosmo
__________________
Life is too important to be taken seriously
offline   Reply With Quote
Old 01-17-2007, 09:18 AM   #14
modifieddriver
Old School HAMBer
 
modifieddriver's Avatar
 
Join Date: Jan 2005
Location: Moonville, USA south of Greenville,SC
Posts: 3,085
Default Re: How to identify a 327

That's because of the rod length to stoke ratio. The 327 is almost perfect.

GM built the 350 using the same length rods and a longer stroke. This screwed up the ratio.

To fix what GM screwed up, ya' need to put 6.0" rods in a 350. Then it'll behave better.

The small journal 327 was probably the best V8 GM ever made. Most of the large journal 327's got cast cranks and ya' don't need the big bearing diameters.

AND...........GM made the same screw up when they stroked the 427 to 454. Both use the same rods. 427 is quick reving. 454's are lazy.

Ol' Smokey Yunick was an advocate of using the longest rods ya' can fit in an engine. Technically it makes sense.


Quote:
Originally Posted by cosmo
For those reading this and wondering "why bother, build a 350 and call it anything..." I can tell you from experience that a 327 has a smoother 'feel' to it, and revs slightly faster than a 350.
I had a 327 in a '72 Camaro (it needed an engine, and I found a '68 327 out of a Caprice...), drove it both before (ratty 350) and after the swap, and liked the 327 better.
Oh, yeah, the Camaro was a four speed car, too. The 327 felt REAL good with the muncie.

Cosmo
__________________
If ya' really want it.....all ya' have to do is "STEP-UP".
offline   Reply With Quote
Old 01-17-2007, 09:24 AM   #15
RacerRick
Old School HAMBer
 
RacerRick's Avatar
 
Join Date: May 2005
Location: Toronto, Ontario
Posts: 2,742
Default Re: How to identify a 327

Quote:
Originally Posted by Flatbush
68 was the first year for big journal,spin on filter and no vent in the rear of the block (for road draft tube or block mounted PCV) meaning you will have to vent it like any ol 350. Probably not the look you want. Big journal, 327 cranks are very, very rare.
They are are not. They are just known as 307 cranks.

Build it as a 350 if its a street engine and call it whatever you want. Much cheaper and torquier than a 327.
offline   Reply With Quote
Old 01-25-2008, 01:32 PM   #16
'81 Exnihilator 327
FNG
 
Join Date: Jan 2008
Location: Unallocated
Posts: 1
Default Re: How to identify a 327

As mr. RacerRick said so dully, a 350 is much torquey-er.....but its a s simple as most of the others are saying, no one really prefers a 350 over a 327.....they rap up faster, the compression ratio(in relativitey to the motor) is much better, and they perform better, and they are sought after much more than a 350.
rareity will make or break the trade/sale of any classic car part, so if you can get your hands on it, take it!
Trust me youd rather find out for sure after youve bought it, than to find out it was a 327 after youve already lost it.....measure the stroke.....3.25"........bdc-->tdc!!!
__________________
" TEXX "
offline   Reply With Quote
Old 01-25-2008, 02:42 PM   #17
enjenjo
Senior Member
 
Join Date: Mar 2001
Location: swanton oh
Posts: 2,300
Default Re: How to identify a 327

I have a fresh .010,.010 large journal 327 crank for sale.
__________________
You can't be part of the elite unless you have someone to look down on.
offline   Reply With Quote
Old 01-25-2008, 03:52 PM   #18
Joe Daddy
Grenade Inspector
 
Joe Daddy's Avatar
 
Join Date: Nov 2007
Location: So Cal 90032
Posts: 232
Default Re: How to identify a 327

From what i know, the cast# 3970010 is most popular as a 350 block. It came in production from 69-80. Also, but very rare, it can be a 302. In 69 the Z28 camaro had the same cast#. As far as i know the 327 never came with that #.
offline   Reply With Quote
Old 01-25-2008, 04:03 PM   #19
silent rick
Alliance Member
 
Join Date: Nov 2002
Location: hammond, indiana
Posts: 2,793
Default Re: How to identify a 327

fuckin newbies bringing up year old posts, wtf?
__________________
selfish disgusting anti-social bad influence friend of the devil seeks an intelligent young hard belly with large breasts to dance naked for my amusement.

must ride on fender.
offline   Reply With Quote
Old 01-25-2008, 04:06 PM   #20
50mercfan
Senior Member
 
50mercfan's Avatar
 
Join Date: Nov 2003
Location: Henderson, KY. (the hendo)
Posts: 2,195
Default Re: How to identify a 327

so..what would happen if you put 6" rods in a 327? i've got two of them. would you have to clearance the bottom of the cylinders? that number is very common. all i've ever seen it listed as is 302/350 no 327.
online   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 09:30 AM.