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Old 07-06-2021, 01:13 PM   #1
old splicer
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Default Isky ldb

I'm looking for a timing tag for an ISKY LDB on a 59a style cam Has approximately .290 lift
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Old 07-06-2021, 01:49 PM   #2
Tim Ayers
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Default Re: Isky ldb

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Originally Posted by old splicer View Post
I'm looking for a timing tag for an ISKY LDB on a 59a style cam Has approximately .290 lift
If the lift is accurate, that's an odd one for I believe that less lift than a stock cam has.

Most stock cams have .307" or more lift.
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Old 07-06-2021, 02:09 PM   #3
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Default Re: Isky ldb

Could be for an Ardun.
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Old 07-06-2021, 02:34 PM   #4
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Default Re: Isky ldb

could be a "60" hp
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Old 07-06-2021, 02:38 PM   #5
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Default Re: Isky ldb

Sides of bearing journal & lobe almost look like finish of a steel cam.
Bolt on gear makes it not a 60 unless had custom cam & gear but poster states it’s 59Ab

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Old 07-06-2021, 05:19 PM   #6
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Default Re: Isky ldb

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I believe that is an Ardun cam and it stands for "Long Duration Bigalow". Looks like it is a steel core cam - maybe created from a 32 billet. Not much lift . . .
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Old 07-06-2021, 08:56 PM   #7
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Default Re: Isky ldb

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Originally Posted by Bored&Stroked View Post
I believe that is an Ardun cam and it stands for "Long Duration Bigalow". Looks like it is a steel core cam - maybe created from a 32 billet. Not much lift . . .
Original specs for the GMC 6 LDB were:
In 26/65
Ex 65/26
Cam lift .285
In cl .018
Ex cl .018

Isky adapted the grind to many different engines. The reason it worked so well was the fairly high lift velocity. It made a lot of power at the mid to top end and would turn 8500 in the 270 Dodge hemi I had one in for road racing.
The pictured example is very likely for an Ardun conversion.
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Old 07-06-2021, 09:49 PM   #8
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Default Re: Isky ldb

Does an Ardun conversion have push rods and rocker arms ? If so, that would explain the low cam lift since the rockers were probably around a 1.5:1 ratio.

Sal
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Old 07-07-2021, 12:14 AM   #9
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Default Re: Isky ldb

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Originally Posted by scicala View Post
Does an Ardun conversion have push rods and rocker arms ? If so, that would explain the low cam lift since the rockers were probably around a 1.5:1 ratio.

Sal
Original Ardun rocker arm ratio is only 1.2:1.
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Old 07-07-2021, 09:18 AM   #10
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Default Re: Isky ldb

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Originally Posted by Fordors View Post
Original Ardun rocker arm ratio is only 1.2:1.
Using that ratio, it would give you .348" of lift.
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Old 07-07-2021, 09:31 AM   #11
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Default Re: Isky ldb

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Originally Posted by Tim Ayers View Post
Using that ratio, it would give you .348" of lift.
To put that in perspective, a stock Ford cam has a lift of .307, while the Isky MAX-1 has a .364 lift. This may not be a direct comparison, because we don't know how the lifts on the respective cams were measured.
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Old 07-07-2021, 09:36 AM   #12
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Default Re: Isky ldb

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Originally Posted by tubman View Post
To put that in perspective, a stock Ford cam has a lift of .307, while the Isky MAX-1 has a .364 lift. This may not be a direct comparison, because we don't know how the lifts on the respective cams were measured.
I know nothing about how to set up Arduns, but after watching the IronTrap video and hearing what Ronnie Roadster said, there can be clearance issues with the push rods when using a "performance" cam on these units.

Curious at what lift does the clearance issue come into play.
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Old 07-07-2021, 12:03 PM   #13
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Default Re: Isky ldb

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Originally Posted by Tim Ayers View Post
I know nothing about how to set up Arduns, but after watching the IronTrap video and hearing what Ronnie Roadster said, there can be clearance issues with the push rods when using a "performance" cam on these units.

Curious at what lift does the clearance issue come into play.
I think some of those issues were address in the Ardun thread, a short time back.
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Old 07-07-2021, 12:16 PM   #14
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Default Re: Isky ldb

Here it is:
https://www.fordbarn.com/forum/showt...ighlight=ardun
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