Customs Let's see those souped up 261's

Side shot. Bill Hirsch enamel paint takes a long time to dry.

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It may be too late for me since I've already had my engine fully rebuilt. Don't want to drill, tap into the block now

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55 261 punched 80, stroked 4, 848 ported and polished, fenton in and vette out

 

I noticed this on your first photo of this thread and later wasn't sure why you said it's a 1956 block.
What you have is a later block with the large 1/2" NPT fittings for full flow oil lines and filter.

Here is a close-up and description of the oil output ...



In your setup the pin is pushed outwards, so you can plug the input and output for use without a filter.
If you want to use a full flow filter that pin needs to be pushed inwards, so the oil can flow to the 1/2" output.

The smaller 1/8" thread and plug is an access to the crankcase for added byp*** filter option.
My 1962 261 didn't had that any longer.

 

Wow, let me double check my block but I was sure it is a 1956 due to the date code

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How much power are you guys pulling out of these motors?
Very interesting thread BTW


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THIS IS CRITICALLY IMPORTANT INFORMATION.

 

Click on the '261' number and link in my signature.
It has graphs and numbers from a dyno test done in the 1950s by Frank McGurk who also wrote an article how to soup these engines and get these numbers, which is also linked on that page.

 

This is the date code:

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What is the number by the distributor and the longer casting number ?

 

3769925

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Hi Guys. Wow, this is great. I am cheating a bit with my post here on the 261 thread because when I had to rebuild/replace my old 216 I simply was not finding any 261's & went with a 1957 235 engine. everything inside engine is new with the exception of the crank & it was reground. Bored 0.060 with flat top pistons, hardened valve seats, new oil pump & fuel pump, new valves, Clifford cam, HEI distributor from Langdon, dual Clifford intake with 2 barrel Webbers with the cast aluminum Orbit air filters, dual Clifford shorty headers, 12 volt conversion and a bit of chrome and polished aluminum on the engine. I have a Thickstun finned aluminum rocker cove but have not installed yet. Installed new Coker radial bias look alikes - 600r/16 front & 700r/16 rear and it scoots down the Hwy at 70 MPH at around 2,500 RPM and with the narrow radials drives in a straight line quite well.
We are still in the process of installing a new wire loop and a Vintage Air unit. Under hood photo still shows ratty wiring but that is quickly changing.
Changed the 411 ring & pinion out to a 355 and still running 3 on the tree.
Next couple of weeks adding a fan shroud and adding new tube shocks as boosters & leaving the knee actions in place for looks as they are not doing any work anyway.. I found a post on the VCCA forums recently that showed photo's of a conversion kit that Monroe offered in 1948 to convert to tube shocks. Kit included the mounting brackets so I have those pics for a guideline to make my new brackets.
Now that I am this far along with a finished engine I have found several 261 engines that were removed while running some years ago but would need a rebuild now. Too late for me to change that engine now. The guy with the engines is my mechanic and also has several of the floor shift transmissions and I believe one side loader. I think he has plans to rebuild to buyers specs and sell as finished engines now.
I am making every effort to keep the exterior & interior all in the style of the original and just see differences when the hood is up. It will not be a race car, just a great daily driver for me.
Jimmie

 

That was cast in 1958-1962.

The numbers stamped into the flat surface next to the distributer give more detailed information of the plant and date.

 

Impressive. Nice to see the separated power curves with the different mods


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Thanks Roadrunner. There are no numbers on that flat area. Just a line

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Interesting.
The D 18 6 does indicate April 18 1956

But the casting number and full flow fittings are from the later years.

?

 

Yeah, that's confusing

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Maybe the guy mounted the number 9 upside down ?

In another casting number listing it says 1959-62

 

Impressive power. Nice to see the separated power curves


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Yes, who knows?!


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Hendrix, If 6 Was 9