Mark IV Blocks? - Chevelle Tech
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post #1 of 18 (permalink) Old Jan 15th, 19, 8:03 PM Thread Starter
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Chas
 
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Mark IV Blocks?

I am just starting to search for a Mark IV 454 big block, no dates are of interest, just a solid Mark IV 454 that doesn't have issues.

My last one I got was a 454 but I got to hear it run before I bought it which gave me a pretty good reassurance the engine was pretty sound. After getting it it turned out to be fine, other than needing a rebuild, and getting the heads done.

In looking for a 40 year old engine are there anythings to look for in a Mark IV block? anything to stay away from?

If I can't hear it run, walk away?

I have heard horror stories of guys buying cracked blocks and junk engines

Chas

My car:

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"The past is gone. The future may never see a car like this. It is one of the brutes, and all it needs is a way of staying in contact with terra firma" Hot Rod Magazine, May 1970.
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post #2 of 18 (permalink) Old Jan 15th, 19, 8:47 PM
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Re: Mark IV Blocks?

if you cant hear it run, just dont pay too much for it in case it is junk. And make sure it rotates. jim
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Jim

70 chevelle, SS clone 454 4 speed
71 camaro. (owned since 1978!) 6-71 blown small block 400
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post #3 of 18 (permalink) Old Jan 15th, 19, 9:20 PM
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RonO.
 
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Re: Mark IV Blocks?

Be prepared Chas, have cash and move quickly if it looks good. The first thing we need to know is "what do you intend to do with this motor, this will determine a good base for your build. I like the 289 blocks for non-number builds, higher nickel content, stronger. Plenty of meat to overbore. If you find a player, see if the seller will give a written guarantee that the core is rebuildable. Depending on your time frame a prebuilt suited to your app may make more sense. Check out some of the builders on this site. Good luck and have fun.
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post #4 of 18 (permalink) Old Jan 15th, 19, 9:22 PM
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Mr Bill
 
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Re: Mark IV Blocks?

Chas,
Are you looking for just a block or an entire engine ? Blocks are getting harder to find in decent shape. Most have been bored oversize by now. Not sure what to tell you to look for in an entire engine. Really cannot tell anything without taking it apart.
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post #5 of 18 (permalink) Old Jan 20th, 19, 4:39 PM
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Gerry
 
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Re: Mark IV Blocks?

Call Steveís Automotive and Machine
Little Valley NY 14755
716-938-9130

Great guy to do business with.

67 SS BBC
4.11's
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post #6 of 18 (permalink) Old Jan 20th, 19, 7:48 PM
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Jeff
 
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Re: Mark IV Blocks?

Quote:
Originally Posted by Chevy 70 SS vert View Post
I am just starting to search for a Mark IV 454 big block, no dates are of interest, just a solid Mark IV 454 that doesn't have issues.

My last one I got was a 454 but I got to hear it run before I bought it which gave me a pretty good reassurance the engine was pretty sound. After getting it it turned out to be fine, other than needing a rebuild, and getting the heads done.

In looking for a 40 year old engine are there anythings to look for in a Mark IV block? anything to stay away from?

If I can't hear it run, walk away?

I have heard horror stories of guys buying cracked blocks and junk engines
Look in local craigslist for 73-90 MK-IV 454 truck motors, consider any used engine a core. Also check local machine shops who sometimes get burned by customers not picking up and paying for work done to a block.
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Jeff

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post #7 of 18 (permalink) Old Jan 20th, 19, 9:26 PM
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Re: Mark IV Blocks?

If itís a complete engine, look for water in the oil. If it is not runnable, but turns over, pull the plugs and with a breaker bar, see if it turns over easily. Stick a finger in each spark plug hole and have a friend turn it over as fast as possible and see if it blows your finger out of each hole.

Pry the crank back and forth looking for excessive end play.

If you find just a block, if the cylinders are not cracked, it shows no evidence of a spun main bearing, and has not been bored to a used .060 over, then itís probably going to be a ok block.
Saltherring likes this.

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post #8 of 18 (permalink) Old Jan 21st, 19, 11:40 AM
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Mike
 
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Re: Mark IV Blocks?

If I ever build another BBC I'm going to start with a new aftermarket block. By the time you find a decent used block and pay for machining, the price is in the same ballpark.
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Mike

69 Chevelle 496/TH400
ET/Speed - 11.371 @ 117.23 - SOLD JUNE 2017

https://www.chevelles.com/showroom/da...SCS2012_S_.jpg

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post #9 of 18 (permalink) Old Jan 27th, 19, 10:15 PM Thread Starter
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Chas
 
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Re: Mark IV Blocks?

Thanks guys. I lucked out on my last 454 and got to hear it run. Rebuilt it and it turned out awesome!

I now want to build another 454 for my GMC truck.

Chas

My car:

https://i.ibb.co/3Yk7KXt/A-b.jpg

"The past is gone. The future may never see a car like this. It is one of the brutes, and all it needs is a way of staying in contact with terra firma" Hot Rod Magazine, May 1970.
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post #10 of 18 (permalink) Old Feb 10th, 19, 11:45 PM Thread Starter
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Chas
 
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Re: Mark IV Blocks?

Quote:
Originally Posted by 70SSTHUMPER View Post
Be prepared Chas, have cash and move quickly if it looks good. The first thing we need to know is "what do you intend to do with this motor, this will determine a good base for your build. I like the 289 blocks for non-number builds, higher nickel content, stronger. Plenty of meat to overbore. If you find a player, see if the seller will give a written guarantee that the core is rebuildable. Depending on your time frame a prebuilt suited to your app may make more sense. Check out some of the builders on this site. Good luck and have fun.
Good thoughts. My previous engine in my current 70 Chevelle is a street 454 build (bored to a 468), roller cam, 781 heads. The Chevelle has awesome driveablity with GREAT power, never over heats, requires no maintenance, just all around a great driving FUN engine and etc. This next build will be going in my truck (do NOT plan to tow with it).

Chas

My car:

https://i.ibb.co/3Yk7KXt/A-b.jpg

"The past is gone. The future may never see a car like this. It is one of the brutes, and all it needs is a way of staying in contact with terra firma" Hot Rod Magazine, May 1970.
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post #11 of 18 (permalink) Old Feb 11th, 19, 12:17 AM
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Re: Mark IV Blocks?

If you go to Mark Jones Vortecpro videos on youtube you'll find what your answer is, performance BBC build
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post #12 of 18 (permalink) Old Feb 11th, 19, 7:37 AM
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Re: Mark IV Blocks?

Quote:
Originally Posted by Georgia69 View Post
If I ever build another BBC I'm going to start with a new aftermarket block. By the time you find a decent used block and pay for machining, the price is in the same ballpark.

That's gotta be a big ol' ballpark! Even aftermarket blocks need to have everything checked. Most will need boring and honing, decking, yada yada yada. I can get 454 blocks here for $200, I paid about $2000 for my Bowtie. For anything street or street/strip, a production block will generally be fine.


Now if you're arguing for having a basis for 750 - 2000hp along with all the other huge benefits of a Dart or Bowtie, I'm in!

Gary Adrian
Organized people are just too lazy to look for their stuff...
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post #13 of 18 (permalink) Old Feb 12th, 19, 10:25 AM
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Mike
 
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Re: Mark IV Blocks?

Quote:
Originally Posted by Busted Knuckles View Post
I can get 454 blocks here for $200
I hear that a lot, but not sure I believe you can get a good one for that money.
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Mike

69 Chevelle 496/TH400
ET/Speed - 11.371 @ 117.23 - SOLD JUNE 2017

https://www.chevelles.com/showroom/da...SCS2012_S_.jpg

1965 Chevy Impala 355/TH350 - NEW RIDE JUNE 2017

https://www.chevelles.com/showroom/da.../65Impala2.jpg

https://www.chevelles.com/showroom/da..._11Jul2017.jpg
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post #14 of 18 (permalink) Old Feb 12th, 19, 12:20 PM
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Re: Mark IV Blocks?

Quote:
Originally Posted by Georgia69 View Post
I hear that a lot, but not sure I believe you can get a good one for that money.
You can around here but it'll be a door stop. I expect to pay about $500 for a good virgin core but they're getting scarce.

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69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

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post #15 of 18 (permalink) Old Feb 12th, 19, 12:45 PM
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Mr Bill
 
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Re: Mark IV Blocks?

Quote:
Originally Posted by Busted Knuckles View Post
I can get 454 blocks here for $200

Wow, not around here either. I sold a 4 bolt main Mark IV block that was already .030 over and needed a sleeve for $500 last fall. $200 will buy you scrap metal.

Bill Koustenis
Advanced Automotive Machine
Waldorf Md

Enginerepairshop.com

1971 Heavy Chevy - original owner
1984 Buick Riviera - original owner (Wife's car)
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