1970 Corvette 350Z block
Thread Starter
Heel & Toe
Joined: Nov 2002
Posts: 16
Likes: 0
From: Redding Ca
1970 Corvette 350Z block
Hey everyone, I have an engine question to ask.
I have a 1970 Corvette Z block 350. I was wondering what it is worth as a short block, how desireable they are and what corvettes they came in. The information that i know about this block is that the Suffix code ends with a Z and according to the man i got it from its suppose to be a hi-perf block. According to the little information i found, it was cast in 1970, had 370hp stock, is a hi-perf hi-nickel block and is very rare. If anyone has anymore info about this block i would be incredibly happy to hear it :) thank you all.
I have a 1970 Corvette Z block 350. I was wondering what it is worth as a short block, how desireable they are and what corvettes they came in. The information that i know about this block is that the Suffix code ends with a Z and according to the man i got it from its suppose to be a hi-perf block. According to the little information i found, it was cast in 1970, had 370hp stock, is a hi-perf hi-nickel block and is very rare. If anyone has anymore info about this block i would be incredibly happy to hear it :) thank you all.
Race Director
Joined: Aug 1999
Posts: 16,935
Likes: 26
From: Lackey, my own dragstrip VA.
Virginia Events Coordinator
Cruise-In IV Veteran
Cruise-In V Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
NCM Ambassador
Re: 1970 Corvette 350Z block (ChevelleL88)
The "Z" more than likely doesn't mean SHI*
Look here for the casting # of the block. It does not lie.
http://www.mortec.com/castnum.htm
It is behind the distributor hole on the edge of the block near where the transmission bolts up to the back of the block.
Clean off the dirt/grease and look for some large raised #'s as you look at the back of the block, LH upper area.
Should be something like 3970010
Look here for the casting # of the block. It does not lie.
http://www.mortec.com/castnum.htm
It is behind the distributor hole on the edge of the block near where the transmission bolts up to the back of the block.
Clean off the dirt/grease and look for some large raised #'s as you look at the back of the block, LH upper area.
Should be something like 3970010
Thread Starter
Heel & Toe
Joined: Nov 2002
Posts: 16
Likes: 0
From: Redding Ca
Re: 1970 Corvette 350Z block (ALLTHROTTLE&NOBOTTLE)
lol, you guessed my block casting numbers 3970010 is the casting number, but i know its not a 302, the pistons are too large. Its a 4 bolt. Another place that i looked up the casting numbers for her said that she was a Corvette block with 370hp... Wish i could find out more info...
Thanks again.
-Eric-
Thanks again.
-Eric-
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Re: 1970 Corvette 350Z block (ChevelleL88)
lol, you guessed my block casting numbers 3970010 is the casting number, but i know its not a 302, the pistons are too large. Its a 4 bolt. Another place that i looked up the casting numbers for her said that she was a Corvette block with 370hp... Wish i could find out more info...
Thanks again.
-Eric-
Thanks again.
-Eric-
[Modified by jackson, 12:51 AM 11/14/2002]
Race Director
Joined: Aug 1999
Posts: 16,935
Likes: 26
From: Lackey, my own dragstrip VA.
Virginia Events Coordinator
Cruise-In IV Veteran
Cruise-In V Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
NCM Ambassador
Re: 1970 Corvette 350Z block (ChevelleL88)
Eric,
Post all the front engine pad #'s and I can tell you that too!
You can find it by looking:
Engine code stamping could look like: V0603CTK
Post all the front engine pad #'s and I can tell you that too!
You can find it by looking:
Engine code stamping could look like: V0603CTK
Thread Starter
Heel & Toe
Joined: Nov 2002
Posts: 16
Likes: 0
From: Redding Ca
Re: 1970 Corvette 350Z block (ALLTHROTTLE&NOBOTTLE)
Ok here are the stamped numbers, the suffix code.( V0118TJZ )
And about the bore size, i was debating that before i posted my reply but was unsure :) Thanks for your help guys.
-Eric-
And about the bore size, i was debating that before i posted my reply but was unsure :) Thanks for your help guys.
-Eric-
Melting Slicks
Joined: Apr 2002
Posts: 2,103
Likes: 0
From: Tucson AZ
Re: 1970 Corvette 350Z block (ChevelleL88)
The block was used in a variety of applications and could handle up to the 370 hp rating if I remember correctly. What is the date code? A 1970 350 sb could be worth money to someone (me included) that has a 1971 block in their 70.
The TJZ is not a vette. All of the vettes had suffixes that started with "C".
The TJZ is not a vette. All of the vettes had suffixes that started with "C".
Thread Starter
Heel & Toe
Joined: Nov 2002
Posts: 16
Likes: 0
From: Redding Ca
Re: 1970 Corvette 350Z block (ChevelleL88)
What do you mean date code? the only two codes that i could find on the block were the Suffic code and the casting code, along with GM33 and small things like that.
Hmmm according to one place TJZ measn that this block was made in 1973, is a 350 and had 155hp. It was in C-10 through the 2500 series. I may be reading it wrong thoug... http://www.nastyz28.com/sbchevy/spcode8.html . Well i just spent the better half of an hour looking for the second stamped code. I thought it was suppose to be right next to the TJZ suffix code but it was'nt. I cleaned the head surface, the intake dech surface, the oil pan surfact and couldnt find anything... All i could see on the block was the cast code and the suffix code along with GM33 and H and G's and other little one or three digit codes.
-Eric-
Hmmm according to one place TJZ measn that this block was made in 1973, is a 350 and had 155hp. It was in C-10 through the 2500 series. I may be reading it wrong thoug... http://www.nastyz28.com/sbchevy/spcode8.html . Well i just spent the better half of an hour looking for the second stamped code. I thought it was suppose to be right next to the TJZ suffix code but it was'nt. I cleaned the head surface, the intake dech surface, the oil pan surfact and couldnt find anything... All i could see on the block was the cast code and the suffix code along with GM33 and H and G's and other little one or three digit codes.
-Eric-
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Race Director
Joined: Aug 1999
Posts: 16,935
Likes: 26
From: Lackey, my own dragstrip VA.
Virginia Events Coordinator
Cruise-In IV Veteran
Cruise-In V Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
NCM Ambassador
Re: 1970 Corvette 350Z block (ChevelleL88)
:nopity , That is correct!
It is a truck block "T" means that for sure, but a good casting #.
2 or 4 bolt main caps?
That engine was built; Flint,Jan 18th.
Even if it is a 2 bolt, its a good foundation for street use.
Pays to do some homework before you buy anything nowadays
Good luck with the build up :cheers:
It is a truck block "T" means that for sure, but a good casting #.
2 or 4 bolt main caps?
That engine was built; Flint,Jan 18th.
Even if it is a 2 bolt, its a good foundation for street use.
Pays to do some homework before you buy anything nowadays
Good luck with the build up :cheers:
Thread Starter
Heel & Toe
Joined: Nov 2002
Posts: 16
Likes: 0
From: Redding Ca
Re: 1970 Corvette 350Z block (ALLTHROTTLE&NOBOTTLE)
She is a 4-bolt main. She would deffinatly make a great 408. Before i go doing anything drastic now i wanted to ask... With a 4.00 stroke and 0.030 over bore would that make her a 406 or a 408? Im pretty currious about this because some people say 406 and others say 408... Confusing :confused: But she is deffinatly one of the cleaner blocks i have had.
Robert are you still interested in buying her? :D And i saw your vette, SO NICE! :flag
Robert are you still interested in buying her? :D And i saw your vette, SO NICE! :flag
Moderator
Joined: Jun 1999
Posts: 7,117
Likes: 51
From: Dove Mountain Arizona
Re: 1970 Corvette 350Z block (ChevelleL88)
Not rare, but a good block still. I've got a 73 truck 355 (bored) sitting on a stand now ready to go in. It's a truck 4 bolt 350 for sure. If you have the complete short block just have a machine shop go thru it. .030 bore with std crank and rods makes it a 355 cubic inch engine. Simply speaking the block isn't "high performance", it's what you put in and on the block (pistons, cam & crank, heads, headers, etc) that makes it perform. You could safely go to 450 hp on stock rods/crank without problems. Hope this helps..... :cheers:
[Modified by MasterDave, 1:33 PM 11/15/2002]
[Modified by MasterDave, 1:33 PM 11/15/2002]
Thread Starter
Heel & Toe
Joined: Nov 2002
Posts: 16
Likes: 0
From: Redding Ca
Re: 1970 Corvette 350Z block (MasterDave)
I know boring it over 0.030 makes it a 355 with stock stroke. But with a stroke of 4.00 and bored 0.030 over doesnt that make it a 408 or 406? I have a read a couple unofficial webpages and posts about it and i just want to find out more about it. This block isnt going to be made for the average cruiser. This block will either go in my Chevelle most likely. If not then the L88 im picking up this weekend (unfortunatly no heads) will go in the Chevelle.... Most likely the L88 is going in the Chevelle because it only has 30 miles on it, though it has been sitting for around 15 years. So im going to go through the block, check the numbers on it and use her. Im trading a 454 i have for her. To Me its a great trade, i would rather have an L88 then a 454. 427's just kick butt :D she is bored 0.030 over herself. What would 0.030 make a 427?
Thanks guys, you are all really cool to help :)
-Eric-
[Modified by ChevelleL88, 12:44 PM 11/17/2002]
Thanks guys, you are all really cool to help :)
-Eric-
[Modified by ChevelleL88, 12:44 PM 11/17/2002]
