Bow Tie block vs standard mark 4 block? - Chevelle Tech
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  #1  
Old Mar 31st, 10, 9:11 PM
Bolt Bolt is offline
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Default Bow Tie block vs standard mark 4 block?

I have been looking for a mark IV block to build a 496 with. I have found a 399289 casting # block and a Bow Tie 10051107 casting # block.

I am going to look at both this weekend.

Does anyone know if the Bow Tie has high prioty oiling system? Does it have raised lifter bores and require taller lifters? I know it can be bored to 4.500 Is it superior to the early high nickel Mark IV blocks. Would it hold a 1,000 HP application? I was told it was rated for 700 HP.

Can anyone school me on the pros and cons between the 2 blocks? How do they compare in weight?

Thank you fellow Team Chevelle members.
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  #2  
Old Mar 31st, 10, 9:31 PM
badrad badrad is online now
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Default Re: Bow Tie block vs standard mark 4 block?

I think they're rated at more than 700 HP, the standard 502 blocks are advertised at that spec.
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  #3  
Old Apr 1st, 10, 9:06 AM
BigRed-L72 BigRed-L72 is offline
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Default Re: Bow Tie block vs standard mark 4 block?

Quote:
Originally Posted by Bolt View Post
Bow Tie 10051107 casting # block.



Does anyone know if the Bow Tie has high prioty oiling system? Does it have raised lifter bores and require taller lifters? I know it can be bored to 4.500 Is it superior to the early high nickel Mark IV blocks. Would it hold a 1,000 HP application? I was told it was rated for 700 HP.

Can anyone school me on the pros and cons between the 2 blocks? How do they compare in weight?

.
The answers are No, no and no.

Those blocks are really getting hard to find. They came from the factory with a 4.470 bore (502). .
Guys are taking them out to 4.620 ! Way above the 1000 HP mark.

Never heard of a 'high nickel block' for a Big Block

They weigh a little more than a MkIV
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  #4  
Old Apr 1st, 10, 10:15 AM
Bolt Bolt is offline
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Default Re: Bow Tie block vs standard mark 4 block?

Hi Steve,

I looked the casting # up on Mortec. It states that it comes with a 4.250 bore and can be bored to 4.500. I could not find to much more info on this casting # 10051107. So far all that I know is it is an early Bowtie and has cast main caps.

Someone else stated that it was only rated to 700 HP. But they were not sure. I would like this block because of the siamesed cylinder walls. But if it is a weak casting it will get me in trouble.

I was hoping that someone here was familar with the castings of the Bowtie blocks. The new ones are suppose to be way better than the early ones. I was just wondering if the early ones are worth building and are they stronger than a good thick walled standard Mark IV.
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  #5  
Old Apr 1st, 10, 1:14 PM
BigRed-L72 BigRed-L72 is offline
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Default Re: Bow Tie block vs standard mark 4 block?

The blocks are the exact same casting. Whether it was a 454 or a 502 depended on the bore size when it left the factory.
It also has blind head bolt holes.

Here`s a thread from Speedtalk that should help put it into perspective as to power levels and useful bore size :http://www.speedtalk.com/forum/viewt...6e1fa77add8cf9
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  #6  
Old Apr 1st, 10, 2:04 PM
aukai aukai is offline
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Default Re: Bow Tie block vs standard mark 4 block?

Mike took my Bow Tie out to 4.560 and 900 HP......Not sure on the casting number though. It is not the splayed cap block.
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  #7  
Old Apr 1st, 10, 5:13 PM
TD509EFI TD509EFI is offline
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Default Re: Bow Tie block vs standard mark 4 block?

The early BowTie block that you listed has standard MkIV oiling as well as stock lifter bores and height. These blocks came from the factory rough finished for a 4.250" bore. You'll have to check what that one has been bored out to. These blocks do have reinforced decks, lower bores, bulkheads, and main cap areas, unlike standard 454 or 502 engines. The block can be bored to 4.560".

John
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  #8  
Old Apr 1st, 10, 7:57 PM
Bolt Bolt is offline
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Default Re: Bow Tie block vs standard mark 4 block?

Thanks everyone.

This block is supposed to be virgin and in new condition. If I can get it for a fair price I think I will use it. It sounds like a better block than a standard Mark IV. I was hoping it had the high priority oiling system.
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  #9  
Old Apr 1st, 10, 9:02 PM
TD509EFI TD509EFI is offline
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Default Re: Bow Tie block vs standard mark 4 block?

Bolt,

If it has just under 4.250" bore then it's untouched. If you can get it for a good price, it's a much better starting point for a high HP engine than a stock 454 block. Besides having siamesed extra thick cylinders, the main cap bulkheads are also machined from the factory.
It would easily be my choice.

John
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  #10  
Old Apr 1st, 10, 9:58 PM
Bolt Bolt is offline
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Default Re: Bow Tie block vs standard mark 4 block?

Thanks John,

I bought a set of Pro gram Billet main caps. I was going to use them on a 4 bolt Mark IV block. Do you know if they will work on the Bowtie? It would be great if the main caps are the same. Than I will convert it to billet and that should be a stout enough block to handle 1,000 HP I would hope.
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  #11  
Old Apr 1st, 10, 11:10 PM
BigRed-L72 BigRed-L72 is offline
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Default Re: Bow Tie block vs standard mark 4 block?

Quote:
Originally Posted by Bolt View Post
Thanks John,

I bought a set of Pro gram Billet main caps. I was going to use them on a 4 bolt Mark IV block. Do you know if they will work on the Bowtie? It would be great if the main caps are the same. Than I will convert it to billet and that should be a stout enough block to handle 1,000 HP I would hope.
What are you building that you need to add Billet caps ???
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  #12  
Old Apr 2nd, 10, 12:24 AM
aukai aukai is offline
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Default Re: Bow Tie block vs standard mark 4 block?

He wants to join the bad a$$ pump gas club
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YOU KNOW YOU HAVE THE POWER..... AND IF YOU USE THAT POWER BAD THINGS ARE GOING TO HAPPEN!!

Mike Lewis street 572
http://www.lewisracingengines.com/
Holley HP EFI
Marcella Manifolds
Heads by Darin Morgan
Cam by UDHarold
.456 X 1.8/1.7
R2C Filters
www.r2cperformance
Ultra Carbon
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