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Next up: the ODSS gathers this week (Sept 22-24) at a yearly ATHS show in Winchester VA.

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#1427548 Fri Oct 22 2021 02:15 AM
Joined: Feb 2016
Posts: 146
I'll just leave this here...

Twin Turbo 261 []


1953 2-Ton GMC

I'm a machinist... because engineers need heroes too.
DavidBraley #1427559 Fri Oct 22 2021 09:50 AM
Joined: Jul 2000
Posts: 591

Larry Kephart
1937 Chevy Utility Express (Deerslayer)
1955 1st 3100 Chevy (BillyBob)
2017 Cadillac ATS-V (Elvira)
Boca Raton, Florida
DavidBraley #1427564 Fri Oct 22 2021 11:48 AM
Joined: Sep 2013
Posts: 1,421
Wow, YES SIR that's a great project! But, what kind of warranty and just how many MPG can you expect out of a 500 plus HP 261? smile I know, just kidding, pretty sweet. Proves the old saw, speed cost money, how fast can you afford to go?


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1964 CJ5

DavidBraley #1427578 Fri Oct 22 2021 01:34 PM
Joined: Feb 2000
Posts: 4,522
Can you really call it a old 261 when the only original part on it is the block ?

DavidBraley #1427586 Fri Oct 22 2021 02:25 PM
Joined: Jun 2011
Posts: 4,565
Would have helped if they had started with a 302!


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
DavidBraley #1427589 Fri Oct 22 2021 02:46 PM
Joined: Dec 2008
Posts: 1,731
1. obtain base engine
2. discard almost all components
3. pile on $1,000 bills to 2" thickness
4. happy!

DavidBraley #1427600 Fri Oct 22 2021 03:15 PM
Joined: Dec 2008
Posts: 1,105
Only replacement for cubic inches, is rectangular Dollars $$$.

1955.2 3100 Truck

The older I get the more dangerous I am!!!!!
DavidBraley #1427617 Fri Oct 22 2021 05:19 PM
Joined: Dec 2008
Posts: 1,731
Or boost. My 183" Toyota 2JZ-GTE L6 is 520 hp @ 17 psi.

DavidBraley #1427725 Sat Oct 23 2021 09:34 PM
Joined: Mar 2007
Posts: 1,813
Crusty Old Sarge
I know folks are doing big numbers with old iron more and more now days, I think it's just the challenge. True an LS swap would be cheaper but where's the fun in that? It just takes $$$$... Honestly I was waiting for mick53 to join in I sure he knows most of these builders.

Last edited by TUTS 59; Sat Oct 23 2021 09:41 PM.


Come, Bleed or Blister something has got to give!!!
'59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)
DavidBraley #1427834 Sun Oct 24 2021 08:34 PM
Joined: Feb 2004
Posts: 24,968
Kettle Custodian (pot stirrer)
"There's no substitute for cubic dollars" Making the engine look original, with 50% more power is a better trick.

"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self.
Ernest Hemingway


Moderated by  Justhorsenround, KCMongo 

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