Farm Stock Engine Question Building a 'farm stock' tractor. Tractor is red but question is theorhetical. Here are the rules: 466 cubic inch limit 3LM-466 box turbo 10 MM A, 450 Roosa, 13 MM Bosch No Speed Limit 20.8 or 24.5 uncut What is the best bore and stroke combo for this type of set up? Bigger bore so as to not shroud the valves? Longer stroke for more torque? Square engine? Would love some opinions, and personal experiences. Thank you http://www.pulloff.com/phorum/read.php?2,286190,286190#msg-286190 Thu, 16 Apr 2026 01:39:05 -0700 Phorum 5.2.23 http://www.pulloff.com/phorum/read.php?2,286190,286381#msg-286381 Re: Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286381#msg-286381 Big Red Binder Pulling Forum Sun, 02 Feb 2020 11:16:01 -0800 http://www.pulloff.com/phorum/read.php?2,286190,286365#msg-286365 Re: Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286365#msg-286365 Big valves Pulling Forum Sun, 02 Feb 2020 08:12:37 -0800 http://www.pulloff.com/phorum/read.php?2,286190,286360#msg-286360 Re: Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286360#msg-286360 SWI-REDPOWER2 Pulling Forum Sun, 02 Feb 2020 05:28:59 -0800 http://www.pulloff.com/phorum/read.php?2,286190,286256#msg-286256 Re: Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286256#msg-286256 Upnorth Pulling Forum Fri, 31 Jan 2020 06:34:05 -0800 http://www.pulloff.com/phorum/read.php?2,286190,286238#msg-286238 Re: Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286238#msg-286238
Is there a specific clearance that one would want to maintain to ensure the valves were not shrouded and able to have full flow?

Someone told me anything less than 0.125" is limiting flow?? Valves come straight down so clearance is the same at any lift.]]> Redman1456 Pulling Forum Thu, 30 Jan 2020 20:29:28 -0800 http://www.pulloff.com/phorum/read.php?2,286190,286224#msg-286224 Re: Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286224#msg-286224
I would suggest doing what makes sense to you and the engine you have, make sure the valves are not shrouded and the crank is stout.

Rich]]> RCP Pulling Forum Thu, 30 Jan 2020 16:39:38 -0800 http://www.pulloff.com/phorum/read.php?2,286190,286219#msg-286219 Re: Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286219#msg-286219
Quote
old case guy
there is no such thing as a farm stock class anymore. Its more like a hot farm class, gone are the good old days where kids could bring dads tractor to the county fair and have some fun.

In line with your point, I saw a "farm stock" tractor listed for 10K more than a Brian Patton's hot farm tractor...]]> John Murray Pulling Forum Thu, 30 Jan 2020 14:30:59 -0800 http://www.pulloff.com/phorum/read.php?2,286190,286212#msg-286212 Re: Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286212#msg-286212
I guess I'm just more looking for info on whether a larger bore and smaller stroke would be better for this type of class or a longer stroke and smaller bore.

I am new to this and learning how it all works so was just hoping to get some insight on which way to go.]]> Redman1456 Pulling Forum Thu, 30 Jan 2020 13:05:09 -0800 http://www.pulloff.com/phorum/read.php?2,286190,286208#msg-286208 Re: Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286208#msg-286208 Central Illinois Pulling Forum Thu, 30 Jan 2020 12:35:00 -0800 http://www.pulloff.com/phorum/read.php?2,286190,286201#msg-286201 Re: Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286201#msg-286201 old case guy Pulling Forum Thu, 30 Jan 2020 10:40:11 -0800 http://www.pulloff.com/phorum/read.php?2,286190,286199#msg-286199 Re: Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286199#msg-286199 Fuel delivery Pulling Forum Thu, 30 Jan 2020 10:31:31 -0800 http://www.pulloff.com/phorum/read.php?2,286190,286193#msg-286193 Re: Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286193#msg-286193
Feel like I need torque and the ability to lug because its hard to get the tires singing. Usually run in High 3rd (IH) 18ish MPH, but need more lugging power to finish run and spin out.]]> Redman1456 Pulling Forum Thu, 30 Jan 2020 09:20:35 -0800 http://www.pulloff.com/phorum/read.php?2,286190,286192#msg-286192 Re: Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286192#msg-286192 RCP Pulling Forum Thu, 30 Jan 2020 09:17:09 -0800 http://www.pulloff.com/phorum/read.php?2,286190,286191#msg-286191 Re: Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286191#msg-286191 My opinion Pulling Forum Thu, 30 Jan 2020 09:06:45 -0800 http://www.pulloff.com/phorum/read.php?2,286190,286190#msg-286190 Farm Stock Engine Question http://www.pulloff.com/phorum/read.php?2,286190,286190#msg-286190
Here are the rules:
466 cubic inch limit
3LM-466 box turbo
10 MM A, 450 Roosa, 13 MM Bosch
No Speed Limit
20.8 or 24.5 uncut

What is the best bore and stroke combo for this type of set up? Bigger bore so as to not shroud the valves? Longer stroke for more torque? Square engine? Would love some opinions, and personal experiences. Thank you]]> Redman1456 Pulling Forum Thu, 30 Jan 2020 08:58:01 -0800