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Discussion Starter #1 (Edited)
I have a set of Isky 3970-HYRT lifters. I was going to run them in a mark IV. I now have a dart based 540. I was told by Isky that they will work in a Dart block. I didn't think they would work in Darts tall body lifter block. They are reboxed Merrels I guess. Also, how much lift cam I run for a 6500 rpm motor. I am running a set of Jessel pro 1.8s on a set of AFR 357s. Thanks in advance!
 

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The reason we have tall lifters is becasue OEM hyd rollers are taller. A Morel link bar lifter will fit in a Mark 4 or a GEN5/6. Morel lifters built after Jan 1 2014 have the new valving design. For any sustained runs I would recommend this lifter.
 

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I have a set of Isky 3970-HYRT lifters. I was going to run them in a mark IV. I now have a dart based 540. I was told by Isky that they will work in a Dart block. I didn't think they would work in Darts tall body lifter block. They are reboxed Merrels I guess. Also, how much lift cam I run for a 6500 rpm motor. I am running a set of Jessel pro 1.8s on a set of AFR 357s. Thanks in advance!
No, the Isky's will not work in the Dart block without notching the block for the link bar. Like Chris posted, Morel does have a lifter that will.



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Discussion Starter #4
Thanks, problem is I own them and Isky only carries that part number. I am actually going to run the 540 in a 69 chevy short bed, sold or selling my boat stuff. I may just have to notch the block then. I understand the oil galley is in the same spot but the lifter hole is taller. The lifters I have are the Morels with the .750 wheel but since Isky only offers this lifter I am stuck with them, maybe I will be able to trade them for some solids and forget about the hydraulic stuff. Thanks
 

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If it's a Morel lifter, it'll work in the Dart block and the picture in Isky's catalog looks like a Morel.
If you can post a pic of what you have we can say for sure.
The Morel 4603 (which is what this most likely is) will take high .600" lift and 7000+rpm with the right springs and correrct rocker geometry.
 

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No, the Isky's will not work in the Dart block without notching the block for the link bar. Like Chris posted, Morel does have a lifter that will.
If it's a hyd roller with a tie bar it's a Morel.
 

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Discussion Starter #7
If it's a Morel lifter, it'll work in the Dart block and the picture in Isky's catalog looks like a Morel.
If you can post a pic of what you have we can say for sure.
The Morel 4603 (which is what this most likely is) will take high .600" lift and 7000+rpm with the right springs and correrct rocker geometry.
I posted pics in my original post. The heads have 1.8 Jessel Pro rockers. I was hoping to run .700 lift or very close to it, the AFR 357s are big for my combo but I own them. I was also wanting to make sure the 1.8 will work with hydraulic lifters. I'll have to ask Chris to spec me a cam. Money is tight right now, I lost my job last Wednesday. I also have a new ISKY roller that I can mock up, but it is only 600 lift and is probably too small to have Isky regrind for the lift I need. Thanks for the help guys!
 

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Here is a Morel 4603 BB Chevy retro hyd. roller lifter. You be the judge. This will work in all Gen and Mk blocks, Dart, World, Bluprint, etc.
You need to run 200-225 seat pressure and 500-550 open pressure with as much cam as you're going to want to run. I don't think you'll need any where near as much cam as you think, but I'll leave that up to Chris.;)

 

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Here is a Morel 4603 BB Chevy retro hyd. roller lifter. You be the judge. This will work in all Gen and Mk blocks, Dart, World, Bluprint, etc.
You need to run 200-225 seat pressure and 500-550 open pressure with as much cam as you're going to want to run. I don't think you'll need any where near as much cam as you think, but I'll leave that up to Chris.;)

pretty amazing a "juicer" can take that much spring:shock:how much preload?
 

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Live and learn. Looking at the picture Jungle posted that wasn't up there, and the hyd rollers I had seen before came out of Shaver Engineering, they did not fit Dart and Gen 6 blocks.
Good to know.
Actually Shaver has some that will work with the .300" taller bore.
 

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Discussion Starter #14
Here is a Morel 4603 BB Chevy retro hyd. roller lifter. You be the judge. This will work in all Gen and Mk blocks, Dart, World, Bluprint, etc.
You need to run 200-225 seat pressure and 500-550 open pressure with as much cam as you're going to want to run. I don't think you'll need any where near as much cam as you think, but I'll leave that up to Chris.;)

Thanks again. I would like the engine to make 800hp, which shouldn't be that hard with the 357 head I hope. I just know that the head needs as much lift as I can get if I am running a hydraulic roller. But I am not a builder, just an assembler and internet troll
 

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Thanks again. I would like the engine to make 800hp, which shouldn't be that hard with the 357 head I hope. I just know that the head needs as much lift as I can get if I am running a hydraulic roller. But I am not a builder, just an assembler and internet troll
Don't get caught up in lift, I have take it away along with duration and made more power. The lifter you have in your OP will work, I'm sure of that.
 
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