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Jul 21st, 2025 | | | | Joined: Oct 2009 Posts: 201 Shop Shark | | Shop Shark Joined: Oct 2009 Posts: 201 | Anyone have a torque/HP curve for a stock 250? Trying to pick a rear end gear and a torque curve would be helpful.
Thanks in advance.
'69 1/2T stepside, Sea Foam Green, 250 L6 w/ 3 on the tree, not an option on it, in the family since new.
| | | | | Joined: Feb 2000 Posts: 4,886 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 4,886 | No dyno chart, but according to calculators, mine is making about 150hp at the flywheel and 125 or so at the ground using dragstrip time sheets. This just what a stock engine should make.
I am using a 3.08 rear axle with a T350 trans and stock 250 engine. My truck weighs 3350 with me in it. I changed from a 3.42 due to highway rpm. I losts some low speed torque, but I gained out on the road. I drive 65 to 70 most of the time so it was a good trade. Rear tires are 235/75 R15 radials.
Joe | | | | | Joined: Oct 2009 Posts: 201 Shop Shark | | Shop Shark Joined: Oct 2009 Posts: 201 | Thanks for the input. Mine's got what appears to be a 2.40 rear end, seems a little highly geared. Like you I'm also running a TH350. I'll actually be on side streets more often than not so I was even thinking something lower, like a 2.73 or along the lines of the 3.08 like you've got. So you're running around 2600 at highway speeds? Not too buzzy? A 2.73 would put me around 2300.
ETA - PS Like your truck. Pretty much what I'm going for - period correct looking, but with modern driving comfort.
Last edited by The Green Farmer; 09/01/2010 4:10 AM.
'69 1/2T stepside, Sea Foam Green, 250 L6 w/ 3 on the tree, not an option on it, in the family since new.
| | | | | Joined: Nov 2005 Posts: 266 Shop Shark | | Shop Shark Joined: Nov 2005 Posts: 266 | Farmer, the Restoration Pack that I ordered from GM has the stock dyno charts for a '66 250 in it. If I remember when I'm home from school this weekend, I'll scan it and upload it to webshots. If you want, I can send you an email with it as well. | | | | | Joined: Feb 2000 Posts: 4,886 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 4,886 | 2600 is about right at 65 mph. Its just the right rpm, has plenty more for passing and enough torque to hold steady speed.
I wouldn't go any lower then a 3.08, I can't imagine how doggy that 2.41 is. Mine is bad enough with a 3.08 compared to the 3.42!!!
Joe | | |
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