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05-29-2025, 01:54 PM
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#1 |
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Senior Member
Join Date: May 2010
Location: Portland OR
Posts: 6,458
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1925 with Chevrolet overhead conversion
End of May red eye candy. Poured machined my own mains. Will be using timer and coils. Not a high compression setup, just a bit more over stock.
 The coil box will/is mounted on the bracket in the last photo like the 1926/27 did.
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I know the voices aren't real but damn they have some good ideas! 
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05-29-2025, 10:23 PM
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#2 |
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Senior Member
Join Date: May 2010
Location: Oregon
Posts: 6,581
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Re: 1925 with Chevrolet overhead conversion
What HP will you expect? It does look real nice.
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05-30-2025, 11:13 AM
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#3 |
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Senior Member
Join Date: May 2010
Posts: 1,748
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Re: 1925 with Chevrolet overhead conversion
Great engine. Zoom zoom!!
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05-30-2025, 12:05 PM
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#4 |
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Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 18,006
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Re: 1925 with Chevrolet overhead conversion
Mods like this make me wonder how a person deals with piston clearance and clearance volume. The adapter plate has to be pretty thick to get a good bolt up. Are pop up pistons used?
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05-31-2025, 07:04 PM
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#5 |
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Senior Member
Join Date: May 2010
Location: Portland OR
Posts: 6,458
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Re: 1925 with Chevrolet overhead conversion
HP no clue. How thick would depend on material used to make the plate. I used aluminum at about 1" thick. This one is what amounts to two offset holes made with only using a drill press and burr. Others used a more wedged shape. As long as there is clearance for the valves to come down and popup for top of pistons you can get a lot of squish out of the adapter. I got the water outlet from Gene French years ago.
Just standard pistons. The 1928 head does have larger valves.
__________________
I know the voices aren't real but damn they have some good ideas!
Last edited by redmodelt; 06-06-2025 at 08:31 AM. |
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06-01-2025, 12:34 PM
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#6 |
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Senior Member
Join Date: May 2010
Location: CLAYTON DE
Posts: 1,365
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Re: 1925 with Chevrolet overhead conversion
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You really did good there. Any extra power is always welcome Thanks
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Enjoy yer day. Tom  Hate can't fix what it started. |
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06-02-2025, 06:51 PM
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#7 |
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Senior Member
Join Date: May 2012
Location: Queensland, Australia
Posts: 12,568
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Re: 1925 with Chevrolet overhead conversion
Very impressive |
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06-03-2025, 12:20 PM
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#8 |
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Senior Member
Join Date: May 2010
Location: Portland OR
Posts: 6,458
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Re: 1925 with Chevrolet overhead conversion
Thank you!
You may not be able to view this until May 4th but here is a link to it running. https://www.youtube.com/watch?v=udkEFezOZ2s
__________________
I know the voices aren't real but damn they have some good ideas!
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06-05-2025, 07:37 PM
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#9 |
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Junior Member
Join Date: Nov 2024
Posts: 1
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Re: 1925 with Chevrolet overhead conversion
That's awesome, sounds good too!
Good job Mark! |
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