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Mod | | | Forums66 Topics128,089 Posts1,056,141 Members48,436 | | Most Online14,466
Apr 26th, 2026 | | 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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2010 Posts: 5 New Guy | | New Guy Joined: Sep 2010 Posts: 5 | I would like to scratchbuild a model of the 503 c.i. six cylinder for use in a model truck. I have several pictures but nothing in them can be used a size reference. If someone has one of these engines could I implore you to take a couple of measurements for me. If I could get the measurement of the length of the block, say, at the level of where the spark plugs thread in and the width at the same point and if at all possible the measurement from the bottom of the lowest point of the oil pan to the top of the valve cover I can interpolate the rest. This is going to be in 1/25th scale anyway so a close measurement is all that's necessary. If anyone can help I'd be forever in your debt.
Thanks
Steve
| | | | | Joined: Feb 2004 Posts: 29,798 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,798 | Here's a link to a pic of a 503 valve cover with a yardstick next to it for reference. Copy/paste it into your browser- - - - the Stovebolt site doesn't allow direct posting of pictures. I've got a few more pics of the engine, but nothing else with a measurement. If you make a couple more posts we can communicate by private message. http://www.hunt101.com/data/500/503_GMC_003.JPG Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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
Love your enemies and drive 'em nuts!
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | It just happens I have a spare sitting in my yard:
Valve cover height 4.5"
Head 33" long, 4.5" high, 7.5" wide.
Cylinders( 3 piece engine) 33" long, 9.635" high, 8.625 wide.
Crankcase 35" plus timing gears 2" long, 9.5" high, 12" wide at pan rail.
Whole engine 34" high, front 1/3 of pan scalloped up.
I can get px if you send email address. Carb and exh. on starboard side. Distr. on port side.
Ed
Last edited by EdPruss; 09/14/2016 7:38 PM.
'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: Sep 2010 Posts: 5 New Guy | | New Guy Joined: Sep 2010 Posts: 5 | Wow.....I never hoped for such great info. Thanks so much. my e-mail addy is [email protected] I used to have a 57 GMC Fire Engine with this powerplant in it but had to sell it many years ago. I really miss that rig. Thanks again and any pix you'd like to send would be greatly appreciated. Steve | | | | | Joined: Sep 2010 Posts: 5 New Guy | | New Guy Joined: Sep 2010 Posts: 5 | Thanks so much. That helps quite a bit.
Steve
| | | | | Joined: Feb 2004 Posts: 29,798 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,798 | How's the old Franken-truck coming along, Ed? Ferrying that one to KC was a blast!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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
Love your enemies and drive 'em nuts!
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