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05-13-2020, 11:49 AM | #1 |
Senior Member
Join Date: May 2010
Posts: 4,484
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French Flathead Build
I'm back. Here's the plan. New French block with a new 3.75 crank, new 8ba rods. I've decided to follow Ron's advice and bore out to 3 5/16th for a 258 ci motor. Egge 3 ring pistons, standard size valves, adjustable lifters, I'm undecided between a 77B or Max 1 cam? Standard Navarro 59 AB heads with a Navarro super dual intake with Strombergs. All the usual internals along with a good balance job. Stock 59 AB flywheel. I'm sure I'm forgetting something but that's the basics. I've read all the literature I can find on the French block which leaves one a little confused as to port or not, rework the exhaust or leave it alone for a mild street motor. I'm sure there's various opinions on here and I invite them which will leave me open to suggestions from the experts. Thanks
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05-13-2020, 12:32 PM | #2 |
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Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,779
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Re: French Flathead Build
Any reason not to use a 4" crank?
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05-13-2020, 12:40 PM | #3 |
Senior Member
Join Date: May 2010
Location: Charlotte NC KiWi-L100 available here
Posts: 2,960
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Re: French Flathead Build
Unless you already have crank& rods I would suggest an Eagle 4.125 or 4.250 crank & either NOS 21a rods or Scat rods. There is a large seat of the pants difference with the larger stroke vs. 3.375. I f your buying anyway not much more $. I also prefer pistons with metric rings. Just my opinion. Have fun no matter what your choices
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05-13-2020, 12:55 PM | #4 |
Senior Member
Join Date: Apr 2015
Location: Sweden
Posts: 3,045
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Re: French Flathead Build
The intakes of the frenchblock needs a bit of cleanup even if you´re not going to port it wildly...
Then it needs a cosmetic mill and grind session on the external if not already done to look less industrial... The rest is as icecream...we all like different flavours ! |
05-13-2020, 12:58 PM | #5 |
Senior Member
Join Date: May 2010
Location: Charlotte NC KiWi-L100 available here
Posts: 2,960
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Re: French Flathead Build
Well put Murre
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05-13-2020, 01:09 PM | #6 |
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Join Date: May 2010
Posts: 4,484
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Re: French Flathead Build
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05-13-2020, 01:17 PM | #7 |
Senior Member
Join Date: May 2010
Location: Charlotte NC KiWi-L100 available here
Posts: 2,960
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Re: French Flathead Build
Makes total sense. Have fun.
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05-13-2020, 01:37 PM | #8 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
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Re: French Flathead Build
$$$$$$$$$ The 250 is a nice street build allowimg 8:1 CR with milled EAB heads. The stock cam gives this engine gobs of low speed torque, and you haven't spent much money, but you have a driver that does everything a 284 ?294 ci engine does. with better gas mileage.
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05-13-2020, 02:35 PM | #9 |
Senior Member
Join Date: Oct 2015
Location: Bonita, CA
Posts: 1,374
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Re: French Flathead Build
Where did you buy the block/crank ?
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