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sanborn 12-18-2014 03:08 PM

My flathead engine

I finally got my engine together and it is NOW running. My son is really the assembler----for who I am truly blessed.

One of my goals was to build the meanest sounding flathead around, and I think we have met the goal.

If you want to view it, go to:

beerayb 12-18-2014 03:15 PM

Re: My flathead engine

Sounds bad ass. What cam are you running?

4tford 12-18-2014 03:37 PM

Re: My flathead engine

sounds nice and lots of shiny!!!! Is the intake powder coated???

burly 12-18-2014 04:05 PM

Re: My flathead engine

I agree. That the 1st Comp flathead cam I've heard. Looks good too.

tubman 12-18-2014 04:06 PM

Re: My flathead engine

Engine looks and sounds great! Nice test stand too! I got carried away building mine; (full instrumentation, universal mounts, etc.). It's done except for the fuel tank. I'm looking for just the right one and can't find exactly what I want

Ol' Ron 12-18-2014 04:38 PM

Re: My flathead engine

The only thing wrong with this engine is: The run stand, it will deffinatly ruin the rings and that slow idle isn't doing the lifters any good. The best run stand is an old tire and a jumper cables. Now make sure you run this allot on the stand before you pit a load on it. Sorry, I hate nice run stands, but it does sound great.

lecktrix 12-18-2014 05:30 PM

Re: My flathead engine

Sanborn... Beautiful!! Can ya give us some info? Cam, Bore/stroke, CR?

Ol' Ron... How does the run stand ruin the rings? And damn good idea on the spare tire!!

sanborn 12-18-2014 09:15 PM

Re: My flathead engine

I appreciate everyone's comment.

Now for some specs:
1950 Merc block
3.3125" X 4.00"
Comp Cams "Muther Thumper" cam
Aluminum timing gear
stock rods, shotpeened, rebushed, resized
Intake runners enlarged, polished
Lots of work on the "hump" in the intake runner
Exhaust is cleaned up, edges rounded
The guides are profiled to aid flow
Perfect circle valve seals
Isky springs
Flathead Jack valves and retainers
Vertex mag- external coil
Compression ratio- 9.70 to 1-----That sounds high but you need that much compression to make up for the overlap of the cam.
Wilson & Woods heads- 58 ccs after milling---These heads are great, machining is great, consistent ccs. Lot of area over the valve for flow.

I can probably list another 30 mods. If you have further questions,
just "ring"

Ron, I appreciate your comment----but the idle speed is 850 RPM. We checked it twice. The engine is now off the run-in stand (another flathead is on- a stroker)

Someone asked the question about excessive run-in use being bad for an engine. It is because the engine is never loaded and the cylinder walls tend to glaze and not let the rings seat.

Mike B 12-18-2014 10:33 PM

Re: My flathead engine

I've read mention of running the engine on a stand, and being bad for it...but is this because of older tech rings?...I've never had an issue breaking in cams on belly button engines on a stand (20-30 minutes run time)...and putting them in the vehicle.

To the Op...sorry, my connection is to slow to get the vid running...looks danged nice tho!

mfagan 12-18-2014 10:54 PM

Re: My flathead engine

Very nice!!

Henry/Kokomo 12-18-2014 11:22 PM

Re: My flathead engine

Wicked sound! Love it.

Tim Ayers 12-19-2014 09:16 AM

Re: My flathead engine

Dang, that engine sounds awesome. Nice job. Love it!

sanborn 12-19-2014 11:24 AM

Re: My flathead engine

A couple of other questions that I did not answer:

Yes, the heads, intake and gear cover is powder coated. I am getting too old to polish on aluminum or chrome.

I think I will powder coat(black) the air cleaners.

The pistons and heads are ceramic coated. We have used this in the past on our race engines----Why not on this last street engine!

I am sure most noticed we converted the block to 66% filtered flow.

One comment----I am using Flathead Jack's stainless valves. I was super pleased, when used with his retainers, no shims were needed. Also, no back cutting was necessary---they were ready to go out of the box.

lonewolf 01-17-2015 01:28 AM

Re: My flathead engine

Have you ran the motor in a vehicle yet. If so how do you like the cam. Ive tried to get feedback on the thumper cams but never could get any for a flathead. Thanks

gmanrides 01-17-2015 11:01 PM

Re: My flathead engine

That is one sweet sounding flat.Very nice!

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