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AD Chevy Trucks Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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Joined: Aug 2018
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'Bolter
'Bolter
Joined: Aug 2018
Posts: 1,004
Saw this tachometer on eBay Post implies original equipment Photos aren’t the best Is this an original part for a 1953 truck? https://www.ebay.com/itm/1947-1953-GMC-Truck-0-3500-RPM-Tachometer/124450092248?hash=item1cf9cdb4d8:g:yZYAAOSwaspfuBPu Not sure I want to pay that much to find out But it looks neato -s
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Last edited by 2ManyTrucks; 11/28/2020 6:08 AM .
Joined: Mar 2010
Posts: 1,660
Curmudgeon
Curmudgeon
Joined: Mar 2010
Posts: 1,660
Oh Cool! Wild guess maybe an original commercial diesel truck like the 630? It's driven by a cable so maybe it was connected to the distributor or the generator. I could only find an example from a 1957 GMC 630.
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"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
Joined: Jun 2006
Posts: 693
'Bolter
'Bolter
Joined: Jun 2006
Posts: 693
the low rpm range certainly suggests a diesel.
Joined: Sep 2013
Posts: 1,362
'Bolter
'Bolter
Joined: Sep 2013
Posts: 1,362
the low rpm range certainly suggests a diesel.
Agree it's in diesel rpm range. But could also be stovebolt range. Isn't 3000-3500 the working range for a stovebolt engine?
RR
RonR 1951 3600 with Clark flatbed, T5, 4.10 rear 1970 340 Duster 1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain) 1964 CJ5
Joined: Jun 2006
Posts: 693
'Bolter
'Bolter
Joined: Jun 2006
Posts: 693
thats the useful rpm range for sure, but if i recall correctly the redline for a 6-cyl of that era is around 4200. i figure the tach for a gasoline stovebolt would run up to 4500. but i'm speculating.
Joined: Mar 2010
Posts: 1,660
Curmudgeon
Curmudgeon
Joined: Mar 2010
Posts: 1,660
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
Joined: Jun 2011
Posts: 5,096
Crusing in the Passing Lane
Crusing in the Passing Lane
Joined: Jun 2011
Posts: 5,096
My 630 has a dash mount location for one. Ed
'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.
Joined: Mar 2010
Posts: 1,660
Curmudgeon
Curmudgeon
Joined: Mar 2010
Posts: 1,660
The seller said he bought a group of parts to get the parts he wanted.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
Joined: Sep 2009
Posts: 296
'Bolter
'Bolter
Joined: Sep 2009
Posts: 296
I recall reading that a 216 engine redlined somewhere around 3,200 and a full pressure 235/261 redlined somewhere around 3,800-4,200, but can't seem to put my fingers on that documentation. I never hesitate to put the gas pedal down hard on my 261 in traffic, but I highly doubt I have ever exceeded 3,000 rpms with it.
-Patrick 1953 Chevrolet 3100 261 / 4-speed / 4:11 / Commercial Red
Joined: Sep 2001
Posts: 29,269
Bubba - Curmudgeon
Bubba - Curmudgeon
Joined: Sep 2001
Posts: 29,269