370ci piston to deck height = .019?
370ci piston to deck height = .019? Does it seem ok. Pistons 1-3-5-7 are out the hole at .019 and piston 2-4-6-8 pop up at .014?
Its seems to me that they pop up a little too high. pistons are mahle 4.030 Rods are scat I beams 6.125 Crankshaft is Gm from a ls1.
Its seems to me that they pop up a little too high. pistons are mahle 4.030 Rods are scat I beams 6.125 Crankshaft is Gm from a ls1.
Im not a machinist but thae .005 difference per side doesnt sound right. Did ATKs paperwork mention the deck height? Any amount removed should be noted. Running a stock MLS gasket shouldnt be an issue and would leave you with room.
I just have this thought in my head of an engine coming from a top of the line shop with a perfect deck height and pistons on one side with a .005 taller compression height at .010 out one side and .005 out the other, realizing it, and running a .040 gsket on one side and a .045 on the other and it seems WAY out there. Just an idea of whats in my head. I'd have it checked out.
If that were my engine and a machine shop did the work they'd be correcting something before they got any cash.
Will it run? Sure. For a brand new engine though it needs to be right.
I just have this thought in my head of an engine coming from a top of the line shop with a perfect deck height and pistons on one side with a .005 taller compression height at .010 out one side and .005 out the other, realizing it, and running a .040 gsket on one side and a .045 on the other and it seems WAY out there. Just an idea of whats in my head. I'd have it checked out.
If that were my engine and a machine shop did the work they'd be correcting something before they got any cash.
Will it run? Sure. For a brand new engine though it needs to be right.
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Verdad Gallardo No I didn't measure the bearings. But it did seem odd that all cylinders on the same side were out more than the other. Like you said it will run but since it will be a new engine just want to make things right.
Im not a machinist but thae .005 difference per side doesnt sound right. Did ATKs paperwork mention the deck height? Any amount removed should be noted. Running a stock MLS gasket shouldnt be an issue and would leave you with room.
I just have this thought in my head of an engine coming from a top of the line shop with a perfect deck height and pistons on one side with a .005 taller compression height at .010 out one side and .005 out the other, realizing it, and running a .040 gsket on one side and a .045 on the other and it seems WAY out there. Just an idea of whats in my head. I'd have it checked out.
If that were my engine and a machine shop did the work they'd be correcting something before they got any cash.
Will it run? Sure. For a brand new engine though it needs to be right.
I just have this thought in my head of an engine coming from a top of the line shop with a perfect deck height and pistons on one side with a .005 taller compression height at .010 out one side and .005 out the other, realizing it, and running a .040 gsket on one side and a .045 on the other and it seems WAY out there. Just an idea of whats in my head. I'd have it checked out.
If that were my engine and a machine shop did the work they'd be correcting something before they got any cash.
Will it run? Sure. For a brand new engine though it needs to be right.
Are your pistons on the right side? I know the centerline of my wisecos are slightly offset to the thrust side of the motor and it would make a difference in the height of the rotating assembly but im thinking one side was decked too much. You shouldnt see that much difference.
^^^Yes iam pretty sure their right. I don't know if mahle are offset but They have -4cc valve reliefs. So that made it easier. Do you think with new main and rod bearings would make a difference in the measurement.
Last edited by TX02ramair; Apr 22, 2014 at 03:31 PM.
Bearings could have a minimal effect but seeing the difference of the height relative to passenger or driver side tells me it's the deck height. How did you check the deck height?
When a machine shop just decks a block enough to make each side flat and have a nice RA finish to grab the gasket....they are just doing a quickie, pay me and get it out of here already type of job. This can typically cost between 125-150 bucks and perhaps is fine for a stock type rebuild. The correct way that a quality shop would do is to first measure both bank heights, surface the deck (bank) that's lower, and then make the higher bank match. It really just takes time and experience to get it right which can cost between 175-225 bucks. Hopefully the deck finish is accurate, both sides are flat, perpendicular to one another, and parallel to the crankshaft centerline. At this point you can correct it with different head gasket thicknesses but it's really kind of a crutch-fix that might just irritate you.
Thank you all of you guys for helping. But what iam going to do next is get my crankshaft inspected and get a new set of main and rod bearings and balance the rotating assembly. Remeasure and figure out what can be done. I'll keep you guys updated on the reassembly.