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#1
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Board question/advice…
I have an IA2 and will require a deck clean up that will likely put my piston up to +.010 out-of-the-hole.
My current piston is a Ross with a 2cc dome. Piston to cylinder wall is the nominal suggested spec of .005 (validated by my machinist). Bore size is 4.310. I have (3) Cometic 4.350 MLS gaskets that are .040 compressed thickness. They are all identical and brand new. My question is this: Can I remove the rivets from the (3) gaskets I have and use the third (extra) gasket to add a layer or two to the other (2) gaskets that will be used - to add compressed thickness - giving me another +.010 for a total of .050 or thereabouts? Scat 6.8 steel rod. My machinist is advising having a deck steel shim built (another $200-$250) that would work with my existing gaskets. Does my question make sense? Thoughts? Last edited by Apache Warrior; 03-22-2024 at 01:27 PM. |
#2
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Cometic can make you a gasket any thickness you need and that’s the way to go.
Why is this the case that the block needs to be cut .010”, as that’s a lot to need to get taken off it would seem? is your current piston set as run out of the hole .005”
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#3
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Purchased used. Has a deck issue.
Zero deck currently, max clean up would be .010 and a WORST case scenario. I know Cometic can build any gasket I need. Was just asking the board… |
#4
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I had pistons rods and crank for an MR1 that had issues so put it all in an IA2 and was 0.010 out. Got Cometic 0.050 head gaskets.
Had to do the same when the machine shop that supposedly mocked up my 409 decked it but they were 0.010 out.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#5
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Thank you for the replies so far.
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#6
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If your machinist has a piston vise, and I bet he does. You can just take the desired amount off each piston head. That's a pretty quick and easy operation with a good piston vise.
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#7
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Just wondering, all these "fixes", why not just by a gasket that's thicker? .060 or so and sell the .040 gaskets you have? Are your .040 gaskets new in the box?
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#8
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Quote:
Added the extra cooling hole (known best as ‘421’ hole) in the gaskets with a 1/4 bit to match block. I guess I could sell them. Thank you. |
#9
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Wouldn’t I have to rebalance my rotating assembly? Purchased everything as a complete motor.
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#10
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Quote:
I don't see any problem though |
#11
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Thank you Blueghoast.
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#12
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Bought .080" Cometics for the ability to select the desired stack. Well, sold em before using em.
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#13
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Quote:
Yes. the balance would be effected, slightly, based on the piston head configuration. Probably 2-5 grams. That is within the tolerance range of most balance jobs unless the shop has a really accurate, newer machine. Our Sunnen balancer can balance a crank +- 3 grams. That's the best it can do. |
#14
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Thank you for the replies/advice folks.
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#15
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I would get the correct gaskets and sell the ones you have. I normally get 4 gaskets at a time so I have a second set and avoid price increases also double shipping later on
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Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow. |
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