can someone decode another small block for me please? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67cst · 11-18-2004, 10:08 PM

this time its for my dads 72 3/4 4x4 he just picked up, we know it isnt original but just curious as to what exactly it is

K0612CMJ

Thanks

**bigunde** · 11-18-2004, 10:10 PM

1974 CMJ 350 t4OO police - 4 full size
1980 CMJ 305 automatic trans. H - - full size/Camaro

www.teufert.net

67cst · 11-18-2004, 10:29 PM

we know its a 350, but what are the specs on it? like hp and torque? does it have a 4 bolt etc.....

thanks
Derek

67cst · 11-18-2004, 11:49 PM

ttt

CHEVYE · 11-18-2004, 11:55 PM

i`ve never decoded one where it says 4 bolt or not. i think you have to drop the pan to be sure. the #`s should be the same for both.

67cst · 11-19-2004, 12:06 AM

last one i got i was told the year of the motor, hp and that it was a 4 bolt...

anyone at least know the hp on this motor?

68327stepside · 11-19-2004, 12:38 AM

Block and head info

That always works for me.

*1972C10* · 11-19-2004, 12:40 AM

You cant really go by casting numbers on the main bolt count Ive had a 3970014 4 bolt block and still have a few 3970010 2 bolts Both are numbers many people swear to be 2 bolt and 4 bolt 010 being the four bolt.

mrein3 · 11-19-2004, 02:11 PM

Quote:

Originally Posted by 1972C10

You cant really go by casting numbers on the main bolt count Ive had a 3970014 4 bolt block and still have a few 3970010 2 bolts Both are numbers many people swear to be 2 bolt and 4 bolt 010 being the four bolt.

I fully agree with this comment. I have in my possession two 350s. Both have the same casting number - that being 3970010. One is a 2 bolt and the other is a 4 bolt.

I still don't know why so many people get hung up over 2 bolt verses 4 bolt blocks. Unless you rev it over 7 grand all the time either will last a good long time.

*1972C10* · 11-20-2004, 01:37 AM

Quote:

Originally Posted by mrein3

I fully agree with this comment. I have in my possession two 350s. Both have the same casting number - that being 3970010. One is a 2 bolt and the other is a 4 bolt.

I still don't know why so many people get hung up over 2 bolt verses 4 bolt blocks. Unless you rev it over 7 grand all the time either will last a good long time.

Yeah i know right ... Its beyond me Alot of high performance engines came out in a 2 bolt main configuration. They seemed to hold up just fine.

67cst · 11-19-2004, 12:49 AM

68327-i couldnt find it there...last time i got someone to do this for me it was like 5 minutes later i had an anwser...i wonder why its so difficult

JimKshortstep4x4 · 11-19-2004, 07:55 AM

Information on engines can be looked up a number of ways, but some of the engines you need to check everything available.

The suffix code seems to work pretty well on the older engines but on the newer engines it does not work that well. (Note bigunde's post of the CMJ suffix where it could be a 350 or a 305 engine).

Using the suffix code, block casting number and the date code will help but I don't know of anyway that codes will absolutely tell you whether you have a four bolt or not. If you want to know about the four bolt, pulling the pan is the only sure way.

Jim

Blazer1970 · 11-19-2004, 08:11 AM

My book list it as a '74 - '76 police package 350. HP is not listed. Max net hp for a 350 in this era was about 250 for the Vette engines (245 for Camaro), and most of the car engines had 155 - 165 net hp. I am not sure what kind of tune they offered in the police package.

**bigunde** · 11-19-2004, 09:38 AM

i had one of those cmj "police" 350's before,it was a 2 bolt main,but that does not mean they all were.

67cst · 11-19-2004, 11:21 AM

good enough, thanks for all your help guys

11-18-2004, 10:08 PM	#1
67cst i love summertime Join Date: Jul 2002 Location: Kelowna BC Posts: 4,303	can someone decode another small block for me please? this time its for my dads 72 3/4 4x4 he just picked up, we know it isnt original but just curious as to what exactly it is K0612CMJ Thanks __________________ 1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724

11-18-2004, 10:10 PM	#2
bigunde Rusty Rockerfeller Join Date: May 2003 Location: South Georgia Posts: 1,631	1974 CMJ 350 t4OO police - 4 full size 1980 CMJ 305 automatic trans. H - - full size/Camaro www.teufert.net Last edited by bigunde; 11-18-2004 at 10:13 PM.

11-18-2004, 10:29 PM	#3
67cst i love summertime Join Date: Jul 2002 Location: Kelowna BC Posts: 4,303	we know its a 350, but what are the specs on it? like hp and torque? does it have a 4 bolt etc..... thanks Derek __________________ 1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724

11-18-2004, 11:49 PM	#4
67cst i love summertime Join Date: Jul 2002 Location: Kelowna BC Posts: 4,303	ttt __________________ 1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724

11-18-2004, 11:55 PM	#5
CHEVYE my gas saver Join Date: Sep 2003 Location: Clarksville, TN Posts: 2,046	i`ve never decoded one where it says 4 bolt or not. i think you have to drop the pan to be sure. the #`s should be the same for both. __________________ 85' SWB, 4.3/TH350, getting ready for paint 84`SWB, 462ci./TH400, cowl hood, 15" billet spec., flows, blazer buckets/console, flat black 71`SWB, project ebay feedback

11-19-2004, 12:06 AM	#6
67cst i love summertime Join Date: Jul 2002 Location: Kelowna BC Posts: 4,303	last one i got i was told the year of the motor, hp and that it was a 4 bolt... anyone at least know the hp on this motor? __________________ 1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724

11-19-2004, 12:38 AM	#7
68327stepside Registered User Join Date: Sep 2003 Location: TwentyNine Palms Ca Posts: 43	Block and head info That always works for me. __________________ USMC "Pray for peace, train for war" (The Beast) 68SWB Stepside Original 325hp/327 3:73 Posi Lowered 3.5/4.5

11-19-2004, 12:40 AM	#8
1972C10 Account Suspended Join Date: Dec 2003 Location: Texas Posts: 2,686	You cant really go by casting numbers on the main bolt count Ive had a 3970014 4 bolt block and still have a few 3970010 2 bolts Both are numbers many people swear to be 2 bolt and 4 bolt 010 being the four bolt.

11-19-2004, 12:49 AM	#11
67cst i love summertime Join Date: Jul 2002 Location: Kelowna BC Posts: 4,303	68327-i couldnt find it there...last time i got someone to do this for me it was like 5 minutes later i had an anwser...i wonder why its so difficult __________________ 1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724

11-19-2004, 07:55 AM	#12
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Information on engines can be looked up a number of ways, but some of the engines you need to check everything available. The suffix code seems to work pretty well on the older engines but on the newer engines it does not work that well. (Note bigunde's post of the CMJ suffix where it could be a 350 or a 305 engine). Using the suffix code, block casting number and the date code will help but I don't know of anyway that codes will absolutely tell you whether you have a four bolt or not. If you want to know about the four bolt, pulling the pan is the only sure way. Jim

11-19-2004, 08:11 AM	#13
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	My book list it as a '74 - '76 police package 350. HP is not listed. Max net hp for a 350 in this era was about 250 for the Vette engines (245 for Camaro), and most of the car engines had 155 - 165 net hp. I am not sure what kind of tune they offered in the police package. __________________ Tim

11-19-2004, 09:38 AM	#14
bigunde Rusty Rockerfeller Join Date: May 2003 Location: South Georgia Posts: 1,631	i had one of those cmj "police" 350's before,it was a 2 bolt main,but that does not mean they all were.

11-19-2004, 11:21 AM	#15
67cst i love summertime Join Date: Jul 2002 Location: Kelowna BC Posts: 4,303	good enough, thanks for all your help guys __________________ 1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724



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