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Old 02-13-2021, 05:54 PM   #1
Grease348
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Default 8ba engine

Iím rebuilding my first flathead. I have a block with a stock bore, no major cracks. Will be boring out .030 .060 stock 3.75 stoke. Who Ďs pistons should I be looking at?


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Old 02-13-2021, 07:00 PM   #2
Ziggster
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Default Re: 8ba engine

Mine (C59A) originally was rebuilt with a 40 thou bore, and it needed a 20 thou over to clean things up. So, 60 thou over with stk 3.75” crank and stk heads Went with Eggy domed pistons, but there is another thread here about using these pistons with aluminum heads as there could interference.
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Old 02-13-2021, 07:32 PM   #3
Grease348
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Default Re: 8ba engine

Iíve read that thread. Good information. Iím planning on using iron heads.


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Old 02-13-2021, 08:11 PM   #4
Bored&Stroked
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Default Re: 8ba engine

Quote:
Originally Posted by Grease348 View Post
Iíve read that thread. Good information. Iím planning on using iron heads.


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Most of the stock iron heads are designed for the tri-radius piston crowns - so you should be okay. BUT - take a cheap profile gauge and check how the pistons compare to the chambers - you can learn a lot for a few bucks!
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Old 02-13-2021, 08:28 PM   #5
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Default Re: 8ba engine

Thank you


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Old 02-13-2021, 08:52 PM   #6
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Iím still looking for recommendations. Egge, sealed power, ect. Help me out.


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Old 02-13-2021, 11:09 PM   #7
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Default Re: 8ba engine

Egge
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Old 02-13-2021, 11:48 PM   #8
Scotty's 52 F3
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Default Re: 8ba engine

How do the Ross piston crowns do with EAB heads?
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Old 02-14-2021, 10:55 AM   #9
deuce5wndw
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Default Re: 8ba engine

I know what you are saying! There are so many choices it is confusing! The last 276 flathead I built I used Ross, a great piston. I'm building a .030 over Mercury 255 with NOS EAB heads, 77B cam, with crab distributor now and I'm also looking at the choices, 3 ring or 4 ring and leave the 4th one out, coated or uncoated, cheap Offenhauser or? Sorry I wasn't much help but offering moral support
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Old 02-14-2021, 11:26 AM   #10
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Default Re: 8ba engine

On my last build, I bought a set of 4 ring pistons from Speedway; I think they're Offenhauser. I paid a bit more than $100 on their "Garage Sale" section for pistons, rings, and pins. I dropped them off at my machinist and after some close inspection and a few measurements, he said they looked as good as any. After a bunch of introspection and discussion on "The Boards", we installed them without the fourth (bottom) ring. The assembly was balanced that way. No road miles yet, but everything looks good so far. It is my understanding that forged pistons are unnecessary for a street engine, contributing only a bit of noise when cold. Leaving the fourth ring out seems to have been the correct decision, and the engines starts easily and runs well. I just thought I'd add my input to the above.

I'd have liked to have had "metric" rings and such, but since this engine will probably see less than 20K miles in the next 50 years, it's really not mandatory
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Old 02-14-2021, 12:03 PM   #11
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Default Re: 8ba engine

I too leave the 4th ring off. It's amazing how much more drag there is if you install that 4th ring.
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Old 02-14-2021, 01:02 PM   #12
Ol' Ron
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Default Re: 8ba engine

Auuto-Thermac OR "steel strut" arre the best pistons for a stock rebuild. They can be installed with very little clearance .001/.002. I found a set of NoName pistons like this for my 3/8x3/9 296 engine that I built for Ron H. (NOt me). , Now has 15years and many miles on it. I don't like Ross pistons for street, great racing piston, must be installed with .004/.005 clearance. works fine for 15/20K miles known to burn oil in a cool engine.I do like the Egge 3 ring pistons, never had any problems with them
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Old 02-14-2021, 01:27 PM   #13
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Default Re: 8ba engine

Ron,
I agree that the Autothermic pistons are great for a stock rebuild. But as far as I know, they are not currently manufactured for flatheads. I'd like to be proven wrong on that.
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