327 or 350??????????? - Pirate4x4.Com : 4x4 and Off-Road Forum

Jonathan M · 01-18-2002, 12:30 PM

I need some help figuring out which engine i have. The casting number on the block is 3970010 which indicates it's a 68 327 or a 69-79 350...
So how do i tell the difference between a 327 and a 350 w/o pulling the thing apart and measuring the stroke?

TIA
Jonathan

reddwarf · 01-18-2002, 01:37 PM

You can't. Maybe if it has the original heads and/or manifold, you might be able to tell from those casting numbers, but there is no guarantee that they are original.

Chances are the engine is a 350.

If you can get me the casting number off the heads (it's under the valve covers) I'll see if I can tell anything else about it.

Hillbilly · 01-18-2002, 02:28 PM

I'm pretty sure that it is a 350. With the last 3 digits 010. I got two 350 blocks that have that as the last 3 digits. I got an article somewhere that tells more about the casting numbers. I'll see if I can find it.

CHVYPWR · 01-19-2002, 08:21 AM

You could always pull the oil pan off and get the casting #'s off the crank, that'll tell you what you have.

Dan Gleason · 01-19-2002, 02:46 PM

You can measure the stroke with a dial indicator through the spark plug hole.

Dan

atroader · 01-21-2002, 10:39 PM

GO TO WWW.MORTEC.COM FOR INFO AND TO CHECK CASTING #'S

chwkblazer · 01-24-2002, 01:18 AM

I have been adding casting numbers to my site, slowly but surely.

a sure fire way to tell what you have without taking anything apart is the suffix codes.
there are some numbers and letters right behind your alternator, on a stamp pad that sticks out from the block.
i know by experience that if the stamp pad is long and thin, its a 350, a short stubby pad is a 350 or 327.

but get the numbers off of that "pad" right on the block where the heads meet the block, in the front, on the passenger side, right below/behind the alternator.

the suffix codes i have at my site are at

http://trak.to/chwk4x4

click on : chevy small block casting numbers

good luck

chwkblazer · 01-24-2002, 01:21 AM

if you go to amazon.com you can search for chevy #'s books, they have everything. if you want a book of your own.
i plan to add everything to my site someday

Jonathan M · 01-24-2002, 04:16 AM

Thanks everyone. I measured the stroke and it turns out it is a 350 afterall. Now for the rebuild.......

01-18-2002, 12:30 PM	#1 (permalink)
Jonathan M Registered User Join Date: Jun 2001 Member # 5393 Location: Canada Posts: 137	327 or 350??????????? I need some help figuring out which engine i have. The casting number on the block is 3970010 which indicates it's a 68 327 or a 69-79 350... So how do i tell the difference between a 327 and a 350 w/o pulling the thing apart and measuring the stroke? TIA Jonathan

01-18-2002, 01:37 PM	#2 (permalink)
reddwarf Registered User Join Date: Jun 2001 Member # 5306 Location: Melrose Fla Posts: 2,134	You can't. Maybe if it has the original heads and/or manifold, you might be able to tell from those casting numbers, but there is no guarantee that they are original. Chances are the engine is a 350. If you can get me the casting number off the heads (it's under the valve covers) I'll see if I can tell anything else about it. __________________ "I'm ridin like a felon" -- Doug

01-19-2002, 08:21 AM	#4 (permalink)
CHVYPWR Registered User Join Date: Dec 2001 Member # 8647 Location: Michigan Posts: 92	You could always pull the oil pan off and get the casting #'s off the crank, that'll tell you what you have. __________________ Chevy powered Jeeps, what more can one ask for!

01-24-2002, 01:18 AM	#7 (permalink)
chwkblazer Registered User Join Date: Dec 2001 Member # 8886 Location: Chilliwack BC Canada Posts: 20	casting numbers I have been adding casting numbers to my site, slowly but surely. a sure fire way to tell what you have without taking anything apart is the suffix codes. there are some numbers and letters right behind your alternator, on a stamp pad that sticks out from the block. i know by experience that if the stamp pad is long and thin, its a 350, a short stubby pad is a 350 or 327. but get the numbers off of that "pad" right on the block where the heads meet the block, in the front, on the passenger side, right below/behind the alternator. the suffix codes i have at my site are at http://trak.to/chwk4x4 click on : chevy small block casting numbers good luck

01-24-2002, 01:21 AM	#8 (permalink)
chwkblazer Registered User Join Date: Dec 2001 Member # 8886 Location: Chilliwack BC Canada Posts: 20	1 more thing if you go to amazon.com you can search for chevy #'s books, they have everything. if you want a book of your own. i plan to add everything to my site someday

01-18-2002, 02:28 PM	#3 (permalink)
Hillbilly Registered User Join Date: May 2000 Member # 857 Location: Dickson TN Posts: 1,154	I'm pretty sure that it is a 350. With the last 3 digits 010. I got two 350 blocks that have that as the last 3 digits. I got an article somewhere that tells more about the casting numbers. I'll see if I can find it.

01-19-2002, 02:46 PM	#5 (permalink)
Dan Gleason Registered User Join Date: May 2001 Member # 4826 Location: Wenatchee, WA Posts: 71	You can measure the stroke with a dial indicator through the spark plug hole. Dan

01-21-2002, 10:39 PM	#6 (permalink)
atroader Registered User Join Date: Dec 2000 Member # 2416 Location: Atlanta, GA, usa Posts: 171	GO TO WWW.MORTEC.COM FOR INFO AND TO CHECK CASTING #'S

01-24-2002, 04:16 AM	#9 (permalink)
Jonathan M Registered User Join Date: Jun 2001 Member # 5393 Location: Canada Posts: 137	Thanks everyone. I measured the stroke and it turns out it is a 350 afterall. Now for the rebuild.......

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