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bradley6874 
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Joined: 05 Sep 2010
Location: salisbury md
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 Topic: winter time thinking
Posted: 19 Dec 2014 at 2:36pm |
Just wondering what kinda power you would get out of a 301 GAS if ya bored it ta say 4 inch and strocked it ta say 5 inch in the xt they were Rated 77 hp draw dar just thinking out side the box 
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You can wash the dirt off the body but you can’t wash the farmer out of the heart and soul
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DrAllis
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Joined: 12 Sep 2009
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Posted: 19 Dec 2014 at 3:06pm |
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Why don't you bore to 4 1/2" and change connecting rods and stroke to 4 5/8" which makes 440 cubes.....been there...dun that. HP is mainly determined by carb throat size.
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O.P.S. Heads
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Joined: 02 Jan 2013
Location: Iowa
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Posted: 19 Dec 2014 at 6:47pm |
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You will not make a 5 inch stroke fit in a 301 unless you use Briggs and Stratton connecting rods. Then it still might not fit.
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Larry W.
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Joined: 07 Nov 2010
Location: Luck, WI
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Posted: 19 Dec 2014 at 7:52pm |
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had one taken to 5.25 stroke with continental rods with angled caps,( was a project motor I finished that was started by Bob Sharpe), with billet rods like marties with a tighter angle cap would make it easier. things get really thin inside, and clearances where very tight at that stroke. 5" would be a lot better
Edited by Larry W. - 19 Dec 2014 at 8:03pm
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O.P.S. Heads
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Posted: 19 Dec 2014 at 8:50pm |
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I stand corrected. Shows you how much I don't know.
None the less, if 400ish cubes is the goal, I wouldn't bother stroking the crankshaft. The cost of the crank and billet (if you go that way)rods would not be cheap. If you have a bearing failure it will be expensive to fix. The head (with the gas head being better than the diesel flow wise - but still not good)will only flow so much and if the stock intake manifold has to be used the extra money spent for the last few inches would gain little performance and be better spent somewhere else.
If money and time aren't an issue and more than 400 C.I. is desired, then stroke away.
My personal opinion.
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Larry W.
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Posted: 20 Dec 2014 at 11:56am |
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I completely agree with you. the motor was a half done project someone else started, I felt it left a lot to be desired the way some things where done inside. if my memory is correct I think the rod journals where under 2" even. like you said, you can only pull so much through the intake anyway, and at low rpms it did ok. if I was starting from scratch it would have been shorter stroke, a larger bore then it was, and a fair amount more compression, it was a 8:1 settup.
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DrAllis
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Posted: 20 Dec 2014 at 4:21pm |
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The one I did, had Buda rods and even with those I had to grind flat spots on the camshaft to swing by. A nice set of custom offset rods would have been nice, but 4 5/8" stroke would be the max without welding on the crank.
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bradley6874
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Posted: 20 Dec 2014 at 6:39pm |
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Wow thats some good info now slip that in a d19 for 6mph 440 inches with lots of torque red guys look out
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You can wash the dirt off the body but you can’t wash the farmer out of the heart and soul
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Larry W.
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Location: Luck, WI
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Posted: 20 Dec 2014 at 7:31pm |
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youre exactly right Dr. its like anything though, how much money,and how many billet parts do you want to throw at it.
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