The Ford Barn - Isky ldb

The Ford Barn (https://www.fordbarn.com/forum/index.php)

- Early V8 (1932-53) (https://www.fordbarn.com/forum/forumdisplay.php?f=4)

- - Isky ldb (https://www.fordbarn.com/forum/showthread.php?t=300842)

old splicer

07-06-2021 01:13 PM

Isky ldb

1 Attachment(s)

I'm looking for a timing tag for an ISKY LDB on a 59a style cam Has approximately .290 lift

Tim Ayers

07-06-2021 01:49 PM

Re: Isky ldb

Quote:

Originally Posted by old splicer (Post 2033456)

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.

flatjack9

07-06-2021 02:09 PM

Re: Isky ldb

Could be for an Ardun.

Ol' Ron

07-06-2021 02:34 PM

Re: Isky ldb

could be a "60" hp

KiWinUS

07-06-2021 02:38 PM

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

Bored&Stroked

07-06-2021 05:19 PM

Re: Isky ldb

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 . . .

Pete	07-06-2021 08:56 PM

Re: Isky ldb

Quote:

Originally Posted by Bored&Stroked (Post 2033541)

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.

scicala

07-06-2021 09:49 PM

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

Fordors

07-07-2021 12:14 AM

Re: Isky ldb

Quote:

Originally Posted by scicala (Post 2033627)

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.

Tim Ayers

07-07-2021 09:18 AM

Re: Isky ldb

Quote:

Originally Posted by Fordors (Post 2033663)

Original Ardun rocker arm ratio is only 1.2:1.

Using that ratio, it would give you .348" of lift.

tubman

07-07-2021 09:31 AM

Re: Isky ldb

Quote:

Originally Posted by Tim Ayers (Post 2033733)

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.

Tim Ayers

07-07-2021 09:36 AM

Re: Isky ldb

Quote:

Originally Posted by tubman (Post 2033750)

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.

frnkeore

07-07-2021 12:03 PM

Re: Isky ldb

Quote:

Originally Posted by Tim Ayers (Post 2033752)

I think some of those issues were address in the Ardun thread, a short time back.

frnkeore

07-07-2021 12:16 PM

Re: Isky ldb

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

All times are GMT -5. The time now is 05:12 PM.