Should I get the extra 8 bolts and make it 18, or is 10 good enough?

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Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  rocketpony on April 2nd 2015, 3:20 pm

I done sum searching and was reading that lots of guys are running lots of boost with 10 bolts and no issues and others say go with the 18, so I still havnt got a clear answer.
Motor is a 600ci with c460 heads, a460 block, 15:1 cr. it's mostly n/a but will see a 300hp of nitrous about 20 times a year.
The motor currently has 10 head studs per head, so I was wondering should I get the extra 8 to make it 18?
Thanks

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  dfree383 on April 2nd 2015, 4:07 pm

If you have the correct heads and block use them. Just remember you need to get the correct head gaskets too.

There are early a460 blocks and C heads that are only 10 bolt.


Last edited by dfree383 on April 2nd 2015, 4:08 pm; edited 1 time in total
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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  Curt on April 2nd 2015, 4:08 pm

If its an 18 bolt block, why wouldn't you?
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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  rocketpony on April 2nd 2015, 4:30 pm

Yes the block has the provisions for 18 bolts

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  rmcomprandy on April 2nd 2015, 5:08 pm

rocketpony wrote:Yes the block has the provisions for 18 bolts

Be aware that Ford had two distinctly different 18 head bolt patterns.
One uses the normal 10 bolts with 8 more added and the other uses all 7/16" bolts in slightly different locations.

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  dfree383 on April 2nd 2015, 5:11 pm

rmcomprandy wrote:
rocketpony wrote:Yes the block has the provisions for 18 bolts

Be aware that Ford had two distinctly different 18 head bolt patterns.
One uses the normal 10 bolts with 8 more added and the other uses all 7/16" bolts in slightly different locations.

Are you referring to the A500 / E460 pattern pro stock stuff?

I'm not aware of multiple 18 bolt stuff on a460 blocks and C460 heads.
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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  Lem Evans on April 2nd 2015, 5:39 pm

TFS sells a kit that has the additional 7/16" fastners.

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  rocketpony on April 2nd 2015, 5:48 pm

The 10 are 9/16 head studs, with an additional 8 holes that are 7/16

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  rmcomprandy on April 2nd 2015, 11:03 pm

dfree383 wrote:
rmcomprandy wrote:
rocketpony wrote:Yes the block has the provisions for 18 bolts

Be aware that Ford had two distinctly different 18 head bolt patterns.
One uses the normal 10 bolts with 8 more added and the other uses all 7/16" bolts in slightly different locations.

Are you referring to the A500 / E460 pattern pro stock stuff?

I'm not aware of multiple 18 bolt stuff on a460 blocks and C460 heads.

You may not be aware of a lot of stuff; there is that "Pro Stock" 18 head bolt pattern that came standard on D460 heads which ARE the C460 head castings; (so they initially look exactly the same).
I have personally used quite a few, years ago.

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  rmcomprandy on April 2nd 2015, 11:06 pm

rocketpony wrote:The 10 are 9/16 head studs, with an additional 8 holes that are 7/16

That bolt pattern you mention certainly are the A460 block. Just be sure the heads match.

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  Calypso on April 3rd 2015, 7:37 am

Can you just add the bolt to an existing combo, or will the additional bolts impact cylinder roundness requiring re-hone with appropriate plate?

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  rmcomprandy on April 3rd 2015, 10:03 am

Calypso wrote:Can you just add the bolt to an existing combo, or will the additional bolts impact cylinder roundness requiring re-hone with appropriate plate?

Answer your own question.
Why would you wish to use a stress plate on the deck when honing, in the first place...?
Adding the clamping load of more fasteners changes the stresses.

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  rocketpony on April 3rd 2015, 11:55 am

This motor was always ran with just the 10 head studs, so would anything need to b done if I wanted to run the extra 8?

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  DanH on April 3rd 2015, 4:19 pm

[quote="rocketpony"]This motor was always ran with just the 10  head studs, so would anything need to b done if I wanted to run the extra 8? [/quot]

looks like you missed to post above post by Randy M.

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  rocketpony on April 3rd 2015, 5:39 pm

I seen the post by randy , but I don't understand if anything or what has to be done when adding the additional 8 bolts

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  Lem Evans on April 3rd 2015, 6:09 pm

Given the distance from the bore and the lower tq. value of the small 7/16" hardware, I do not perceive any critical issues in adding the eight extra fasteners .

 

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  rocketpony on April 3rd 2015, 6:19 pm

Thanks for the help again.
So tfs makes a kit with the extra 8 bolts right? Does arp also? Is there one I should go with?

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  Lem Evans on April 3rd 2015, 6:37 pm

rocketpony wrote:Thanks for the help again.
So tfs makes a kit with the extra 8 bolts right? Does arp also? Is there one I should go with?

No, I said 'TFS sells' the kit. ARP make the stuff in the kit & TFS sells it.....as far as I know ARP does not offer the fasteners as a kit.

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Re: Should I get the extra 8 bolts and make it 18, or is 10 good enough?

Post  rocketpony on April 3rd 2015, 7:07 pm

Perfect thanks again

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