Heads "MILLED" .030
10-02-2011, 09:27 AM
#1
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Heads "MILLED" .030 This motor is done, rings cracked or broken, warped heads, Its was OVERHEATED x 10
.(i got the car cheap)
https://ls1tech.com/forums/lt1-lt4-modifications-31/
Bumping up compression by milling the heads .030, can the lt1 rocker arms be shimmed like the old 5.0s? I know about the intake issues. Shims are super cheap compared to a new set of pushrods.
.(i got the car cheap)https://ls1tech.com/forums/lt1-lt4-modifications-31/
Bumping up compression by milling the heads .030, can the lt1 rocker arms be shimmed like the old 5.0s? I know about the intake issues. Shims are super cheap compared to a new set of pushrods.
Last edited by my number 1 hater; 10-03-2011 at 06:07 PM.
10-03-2011, 09:42 AM
#3
On my first LT1 car I owned I overheated the car bad and warped the heads. I had a mechanic pull the heads and he sent them to be decked. Come to find out they had already been decked before. I cant remember the exact number they were decked but I know it was a lot more than .030, seems like it was over .050
He had to drill out the intake to get it to bolt back up. I dont have any idea if he shimmed the rockers or not or if you even can. I was 17 at the time and knew next to nothing about cars.
He had to drill out the intake to get it to bolt back up. I dont have any idea if he shimmed the rockers or not or if you even can. I was 17 at the time and knew next to nothing about cars.
10-03-2011, 12:15 PM
#5
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I believe the word "deck" refers to the deck height of a block. You deck a block for straightness and to get the desired quench area/ volume.
Heads are "milled" to get the desired combustion chamber volume.
Heads are "milled" to get the desired combustion chamber volume.
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10-03-2011, 08:43 PM
#11
You mean raise it?
The LT1 heads can handle .030 or more BUT if they overheated that bad the castings could be soft and you could have perpetual head gasket issues.
Have you looked at the LT1's valvetrain? Exactly what do you want to shim?
I never touched a Ford 5.0l which is all I can guess you are talking about, but the gen 1 and gen 2 smallblock use adjustable valvetrain and came in a 5.0l flavor.
After milling the geometry will be a little compromised but should be serviceable with stock rockers yet.
The LT1 heads can handle .030 or more BUT if they overheated that bad the castings could be soft and you could have perpetual head gasket issues.
Have you looked at the LT1's valvetrain? Exactly what do you want to shim?
I never touched a Ford 5.0l which is all I can guess you are talking about, but the gen 1 and gen 2 smallblock use adjustable valvetrain and came in a 5.0l flavor.
After milling the geometry will be a little compromised but should be serviceable with stock rockers yet.
10-03-2011, 09:49 PM
#12
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You mean raise it?
The LT1 heads can handle .030 or more BUT if they overheated that bad the castings could be soft and you could have perpetual head gasket issues.
Have you looked at the LT1's valvetrain? Exactly what do you want to shim?
I never touched a Ford 5.0l which is all I can guess you are talking about, but the gen 1 and gen 2 smallblock use adjustable valvetrain and came in a 5.0l flavor.
After milling the geometry will be a little compromised but should be serviceable with stock rockers yet.
The LT1 heads can handle .030 or more BUT if they overheated that bad the castings could be soft and you could have perpetual head gasket issues.
Have you looked at the LT1's valvetrain? Exactly what do you want to shim?
I never touched a Ford 5.0l which is all I can guess you are talking about, but the gen 1 and gen 2 smallblock use adjustable valvetrain and came in a 5.0l flavor.
After milling the geometry will be a little compromised but should be serviceable with stock rockers yet.
Let me get this straight. The stock lifter with soak up the .030 takin from the head milling? Thats alot for a lifter to take.
10-03-2011, 09:52 PM
#13
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Pushrods cost alot more than shims, but i dont know if i can shim LT1 heads. So do you have a part number, price, where did you buy those custom length pushrods?
10-03-2011, 09:55 PM
#14
I never said the lifter would take it.
I did ask if you looked at the LT1's valvetrain and what you thought you were going to shim?
These have adjustable valvetrain.
Like I said I never worked on a 302 but I believe they were non-adjustable, hence the shims, different setups and you are miss-applying your experience.
Pull a valvecover and I think you will quickly understand.
The difference will be made up at the rocker arm nut.
I did ask if you looked at the LT1's valvetrain and what you thought you were going to shim?
These have adjustable valvetrain.
Like I said I never worked on a 302 but I believe they were non-adjustable, hence the shims, different setups and you are miss-applying your experience.
Pull a valvecover and I think you will quickly understand.
The difference will be made up at the rocker arm nut.
10-03-2011, 10:44 PM
#15
You will not have intake or valvetrain geometry issues with only a .030 mill. Any differences will be adjusted at the rocker arm...you wouldn't need new pushrods either if you are using the same valves/cam/lifters/rockers.
Intake seal can be suspect if you flat mill way too much, but if you are asking for that much of a milling that it would be an issue, most shops will suggest angle milling to compensate which maintains proper intake sealing.
Intake seal can be suspect if you flat mill way too much, but if you are asking for that much of a milling that it would be an issue, most shops will suggest angle milling to compensate which maintains proper intake sealing.
10-04-2011, 05:49 PM
#17
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I never said the lifter would take it.
I did ask if you looked at the LT1's valvetrain and what you thought you were going to shim?
These have adjustable valvetrain.
Like I said I never worked on a 302 but I believe they were non-adjustable, hence the shims, different setups and you are miss-applying your experience.
Pull a valvecover and I think you will quickly understand.
The difference will be made up at the rocker arm nut.
I did ask if you looked at the LT1's valvetrain and what you thought you were going to shim?
These have adjustable valvetrain.
Like I said I never worked on a 302 but I believe they were non-adjustable, hence the shims, different setups and you are miss-applying your experience.
Pull a valvecover and I think you will quickly understand.
The difference will be made up at the rocker arm nut.
I pulled an old 302 head and my LT1 head. They are very different. I can see how the 302 only needs to be torqued. The rocker nut just bottoms out on the stud.NON adj.
The LT1 rocker arm will just keep pushing the lifter down till its bottoms out.
There is alot to play with there. No shims needed.
