The Stovebolt Page Forums Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Links | Events | Features | Search | Hoo-Ya Shop
Stovebolt Supporter!
Indianapolis

Fabrications

Talk to Randy Domeck

See what they

can do

for you
!


Stovebolt Site Search
 
Old Truck Calendars
Months of truck photos!
Nothing like an old truck calendar

Stovebolt Calendars

Some New
Some Vintage
Many in Production

Check for details!

Will be updating all year around!


Who's Online Now
36 registered members (carbking, 32vld, bwilliams, CenCal53, carryall jerry, 2 invisible), 529 guests, and 6 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums48
Topics106,686
Posts834,308
Members39,828
Most Online940
Apr 5th, 2017
Today's Birthdays
49chevy454, 61lorrie, Frantz, junebug909, Mark H, yllw1964
Image Posting Policy
Previous Thread
Next Thread
Print Thread
#742457 - Mon Apr 25 2011 10:43 PM 250 mods... what makes the biggest difference  
Conductacator  Offline
New Guy
Joined: Oct 2010
Posts: 23
Florida
I'm rebuilding a 250 from the ground up. What modifications make the biggest difference for gaining power? The engine will be going in a truck which will occasionally pull a trailer but mainly be a daily driver. Should I use I use a 4bbl carb or two singles? what cam? any other helpful hints to get the best all-around performance out of the old girl.


1950 Chevy 3600
In the Stovebolt Gallery
More pix on Photobucket

"How can you say I'm not normal? ...I go out of may way Every day to do things that appear normal!!!!"


#742626 - Tue Apr 26 2011 03:51 PM Re: 250 mods... what makes the biggest difference [Re: Conductacator]  
Joe H  Offline
Shop Shark
Joined: Feb 2000
Posts: 4,025
Lee's Summit Mo. 64086
The cheapest and easiest is to add 307 Chevy flat top pistons to raise the compression up around 9 to 1. They bolt right in with out any modifications. Add a 292 exhaust manifold, 3 bolt outlet are 2 1/2" diameter pipe. A small 450 cfm four barrel may help and a little head work, add bigger valves if doing a valve job, not worth it if head is OK.

Joe


#742761 - Wed Apr 27 2011 01:13 AM Re: 250 mods... what makes the biggest difference [Re: Joe H]  
Conductacator  Offline
New Guy
Joined: Oct 2010
Posts: 23
Florida
bad news... got the the engine completely torn down today... its already been born .40 over. Its a piece of junk. back to the drawing board.


1950 Chevy 3600
In the Stovebolt Gallery
More pix on Photobucket

"How can you say I'm not normal? ...I go out of may way Every day to do things that appear normal!!!!"

#742836 - Wed Apr 27 2011 05:58 AM Re: 250 mods... what makes the biggest difference [Re: Conductacator]  
panic  Offline
Shop Shark
Joined: Dec 2008
Posts: 1,057
Long Island
They bolt right in?
You mean, after taking the engine apart down to the bare crankshaft? Not my idea of "bolt in".


#742887 - Wed Apr 27 2011 03:39 PM Re: 250 mods... what makes the biggest difference [Re: Conductacator]  
Hotrod Lincoln  Online
Extreme Gabster
Joined: Feb 2004
Posts: 14,649
Dellrose, TN
How much taper wear do the cylinders have? If there's less than .005" of taper, a re-ring job at .040" oversize won't be a problem. I've built a few 250's to .060" oversize, but they were short-life race engines so a long-lasting rebuild was not a concern. The 307 pistons have all the same dimensions as the 250, including weight, so they're a direct swap. They just have flat tops instead of dished, which raises the compression. I've also done a .050" head mill job on a few engines along with the 307 pistons without getting into piston/valve interference problems with a stock-lift cam, and the engines still ran regular gas without detonation problems. The 292 exhaust manifold is a good suggestion, but they're a little hard to find. If you decide to find another block, the 230 can be used to build up a 250, with just a crankshaft change. The bore size is the same.
Jerry


Who says I live in a rough neighborhood- - - - -?
Just because I'm a tail gunner on a beer truck, maybe?

"He ain't even got a noddin' acquaintance with the truth- - -let alone a speakin' one!"


#742888 - Wed Apr 27 2011 03:42 PM Re: 250 mods... what makes the biggest difference [Re: panic]  
Joe H  Offline
Shop Shark
Joined: Feb 2000
Posts: 4,025
Lee's Summit Mo. 64086
What I mean is, they fit with out any modification to the rod or piston, they are a direct replacement for the stock piston only they have provide more compression.

Joe


#743529 - Fri Apr 29 2011 10:01 PM Re: 250 mods... what makes the biggest difference [Re: Joe H]  
Conductacator  Offline
New Guy
Joined: Oct 2010
Posts: 23
Florida
Water in the cyls and pretty bad scoring. I just junked it and cut my losses. But if any one has a 230/250/292 for sale near by let me know.


1950 Chevy 3600
In the Stovebolt Gallery
More pix on Photobucket

"How can you say I'm not normal? ...I go out of may way Every day to do things that appear normal!!!!"

#743684 - Sat Apr 30 2011 03:11 PM Re: 250 mods... what makes the biggest difference [Re: Conductacator]  
Joe H  Offline
Shop Shark
Joined: Feb 2000
Posts: 4,025
Lee's Summit Mo. 64086
Since you are on the hunt again, go for a 292. It will make more power and torque right off the bat.

Joe


#743709 - Sat Apr 30 2011 06:40 PM Re: 250 mods... what makes the biggest difference [Re: Conductacator]  
Hotrod Lincoln  Online
Extreme Gabster
Joined: Feb 2004
Posts: 14,649
Dellrose, TN
Originally Posted By Conductacator
if any one has a 230/250/292 for sale near by let me know.


Not nearby, but I've got a rebuildable 250 long block, serial # FO421CAB in south central Tennessee. Standard bore, no rust, with what appears to be a good cylinder head. IM me if you're interested. I love to horsetrade- - - -what ya got?
Jerry


Who says I live in a rough neighborhood- - - - -?
Just because I'm a tail gunner on a beer truck, maybe?

"He ain't even got a noddin' acquaintance with the truth- - -let alone a speakin' one!"



Moderated by  53moneypit, Woogeroo 

Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Links | Events | Features | Search | Hoo-Ya Shop
#-->
Powered by UBB.threads™ PHP Forum Software 7.6.0