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Old 06-15-2010, 02:05 AM
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261 Chevy

I am replacing the stock 216 I6 in my 1948 Chevy pickup with a 261~ much like how the hotrodders back in the 50's would do it, so if I put a 4BBL or 3 carb manifold on it(which would be better?), a set of headers, polished and ported the head, raised the compression ratio to around 9.5 or 10 to 1, and upgraded the ignition, what kind of performance could I expect? I figured I could Squeeze at least 1 HP per CI, Right?
Oh, and I was wondering if anyone had any suggestions for a mild street cam and who to get it from? The truck will be a daily driver used for light towing and the occasional race with the guy down the road who thinks his little s10 with a plain 4.3 is all that because it has racing stickers all over it and shiny rims... It's actually geared down for mud boggin'

Last edited by QParker; 06-15-2010 at 04:50 AM.
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Old 06-15-2010, 04:57 AM
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Quote:
Originally Posted by QParker
I am replacing the stock 216 I6 in my 1948 Chevy pickup with a 261~ much like how the hotrodders back in the 50's would do it, so if I put a 4BBL or 3 carb manifold on it(which would be better?), a set of headers, polished and lump ported the head, raised the compression ratio to around 9.5 or 10 to 1, and upgraded the ignition, what kind of performance could I expect?
Oh, and I was wondering if anyone had any suggestions for a mild street cam and who to get it from? The truck will be a daily driver used for light towing and the occasional race with the guy down the road who thinks his little s10 with a plain 4.3 is all that because it has racing stickers all over it and shiny rims... It's actually geared down for mud boggin'
The inliner will respond to the same treatments that improve its V8 brethren. More carburetor on a free-breathing intake, more cam, more compression, long-tube headers. I like 3 carbs rather than a 4-barrel on an inline 6. Looks more hot roddy and I believe distributes the mixture more evenly to the cylinders. Patrick Dykes is just down the road from me and has most everything you would ever want for the stovebolt. I've been by his store and talked with him. Great guy.
http://www.patricksantiquecars.com/chevyparts.htm
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Old 06-15-2010, 05:15 AM
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Is there any cam in particular that anyone can recommend to me, like I said before, the truck will be a daily driver used for light towing and the occasional burn out...
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Old 06-15-2010, 09:39 AM
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I've always nurtured an interest in straight 6 motors, so I was just surfing around for parts for you on this 261 motor. I find that this is probably the proverbial red-headed stepchild of the six cylinder family. There isn't much made for it anymore. And what is made for it costs 2 prices.

Have you considered a different six, like maybe a 250 or 292 that would have a better parts availability? Oh, and more power to begin with?

This is just one for-instance. Engle grinds a plethora of cams for the 250/292. See page 12 here.
http://www.englecams.com/downloads/2...le_catalog.pdf
I like the EP-18/20HYD for a good all-around cam with a 4-speed transmission, like a Saginaw with a 2.54:1 first gear and 4.11:1 ring & pinion. You'd need to raise SCR to 9.0:1 to use this cam.

Speedway has some stuff....
http://www.speedwaymotors.com/ProductSummary.aspx?free_text|3/31/2009%2010:52:08%20AM=chevy+six&deptId=0

There's lots of stuff for the later motors. One link leads to another link. Just do some surfing. Take your time.
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Old 06-15-2010, 10:30 AM
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everything external that fits a 235 from '55- on will fit a 261
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Old 06-15-2010, 10:40 AM
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Quote:
Originally Posted by techinspector1
Engle grinds a plethora of cams for the 250/292. See page 12 here.
http://www.englecams.com/downloads/2...le_catalog.pdf
Not to get off of the original subject, but I didn't think you might know this Tech, but Engle Cams has closed it doors along with Reed Cams shortly after Crane cams folded back in early 2009.
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Old 06-15-2010, 03:25 PM
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I just wanted to keep the truck looking old, and supe it up like they would in "the good ol' days"
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Old 06-15-2010, 06:50 PM
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How about if I put 292 rods, cadallac pistons, and offset the crank
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Old 06-15-2010, 08:09 PM
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You can stroke the 261 using the 292 rods and offset stroking the crank, its been done on the webrodder website. Again, the cylinder head being the biggest restriction, even ported its going to run out of air with more cubes to gain much benefit to impress you.
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Old 06-15-2010, 10:12 PM
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Does anyone know how much to off set the crank, and how many more cubes this will add?
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Old 06-16-2010, 12:29 AM
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The stock 261 stroke is 3-15/16", and the difference between the journal sizes is approx .211(261 is 2.311" and the 292 is 2.100"). Also, you have to weld up the crank rod journal checks to use the 292 rods because they are much narrower than the 235/261 rods. Then you will have to add weight to the counterweight side of the crank to balance it, since you have offset the stroke away from it. When your through, you will realize that you have spent more money than it was worth for the few scant HP you might gain. Stick with the GMC swap, or put a blower on the Stovebolt, thats about the only way to increase the HP enough to tell it.

Last edited by CNC-Dude; 06-16-2010 at 04:21 PM.
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Old 06-16-2010, 01:05 PM
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So say I just ditched the stovebolt and went with a 292, did the above stated mods, and put in the solid lifter "EP-22/25" from Engle grinds.
What kind of power could I expect from it then?
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