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Author Topic:   080 over
posted August 26, 2004 11:36 AM
Too much bore, your cylinder walls are going to be too thin.

posted August 26, 2004 11:59 AM
It might hold if you planted flowers in it

posted August 26, 2004 02:54 PM
good canidate for some sleaves

posted August 26, 2004 04:05 PM
if you have a good block without any core shift, it will work. i know a guy that has done it successfully.

posted August 26, 2004 04:25 PM
I have done it on a street 350 SBC, it worked out just fine, don't know about circle track tho....... But i have seen race short blocks for sale that were 080 over that were built buy a professional local builder here with a good reputation. And i figure if someone makes the pistons.....someone must have made it work...

posted August 26, 2004 07:55 PM
What if you use some block filler in it?
Just asking.

Jason Boivin

posted August 26, 2004 09:35 PM
.125 will be fine

rico 08
posted August 27, 2004 06:03 AM
I raced with a guy who had one .080,he used 425 caddy pistons in them...they have a very big dish tho.

posted August 28, 2004 03:33 AM
i have heard stories of guys going more than that but i don't know if the stories are true
you know kinda like urban legends LOL

drive hard or drive home

posted August 28, 2004 05:19 AM
ok I cant stand it any longer, .080 is ok IF ,like someone said above, the block dont have a lot of core shift, and the cylinders are thick enough. I build em every now and then,and I have to use a SB400 torque plate to hone an .080, but even at cant expect the rings to seal perfectly cuz the cylinders are so thin they move around a lot.

I have also "half filled" an .080 over with hard block and it seemed to work pretty good.

I will be honest, I dont really like .080 over motors, but I build them to use an otherwise worthless worn out .060 core.

you will probly be happy with it if you arent running it in a sprint car or somthing.

as for boring them over .080....yes I have seen it first hand...there is a guy here in town that bores them to 4.125 (.125 over, or std. 400 bore) and makes 377 claimers out of them..BUT I DONT RECOMENED THIS! I have seen a lot of them fail.


Mark T.

Mark's Racing Engines


posted September 18, 2004 09:55 PM
Where does a person get .080 over pistons? Never seen them before. Are they available in hyperuetectic?

posted September 19, 2004 08:14 PM
i claimed a motor once that was a .125 over 350 3970010 block standard 400 pistons ran it until it got to much blowby put in new rings ran it until rod broke something like 30 shows bottom half block had filler in it on alky no overheating

posted September 19, 2004 09:17 PM
Do they still cool alright with the block filler? How high in the block do you go?

posted September 20, 2004 05:12 PM
When you use the block filler in an endurance style engine. You should only fill it to the bottom of the freeze plugs

posted September 25, 2004 11:20 AM
I have filled many ford blocks up to the bottom of the waterpump holes.Works fine with additional piston to wall clearance. Never had piston or temp. problems on gas circle track engines.

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