|02-09-2004 08:58 AM|
Thanks for the comments and suggestions. Another machine shop, recommended to me, quoted $2500 for a rebuilt 400, 4-bolt.
I don't think, that with what I'm looking for in a motor, I'm going to go wrong with the 350 crate. Thanks, Ghetto Jet, for the link.
Astroracer, thanks for the link, too. I have thought about this off and on and now would be the time. This probably is the best answer to the mpg. issue.
|02-08-2004 10:06 PM|
|Ghetto Jet||Here's a brand new 350 with 4 bolt mains $1200.00 made by GM, has a 3 year 50,000 mile warranty and makes 260 horses with a extremely tame cam, 8.5:1 compression, will give you great gas mileage. Great motor, I bought one. Heres the link, I only paid about $100 for shipping. http://www.paceparts.com/product.asp?0=0&1=0&3=3169|
|02-08-2004 04:47 PM|
I would go through the 350. If you aren't looking strictly for performance it is more cost effective. You can do a good rebuild with a kit from Nortern Auto Parts... http://www.northernautoparts.com/Pro...uctModelId=380
I doubt you would have to replace the rods so this kit will work for you. They have other more expensive kits so look around on their site.
What I would replace is the TH350 trans. Lose it. Put in a 700R4 rebuilt to Corvette specs and will you see a major increase in mileage, more response off the line and less engine wear at highway speeds. Look here... http://www.smokemup.com/tech/700r4.php
Lots of good info. Run through the RPM calculaters to see the benefits of the O.D. swap... Best thing you can do.
|02-06-2004 05:06 PM|
Most likely, the motor could get by with just a boring and new pistons, rods, but you know how that goes. When I bought it, the guy had had a crank kit put in and head work done . The motor should have been bored when he put in the kit, but hadn't. It ran good, didn't use excessive oil, but would develop a slight miss and foul a plug after a couple days of running. The motor probably has 10,000 miles on it.
In a discussion, a fellow told me with the 400, even with more CI, the added torque could keep the foot out of the carb increasing mpg and that was the only reason I considered it.
|02-06-2004 01:24 PM|
|bullheimer||more cubic inches means worse milage. how in the world could a crate engine be less than a rebuild? at least you get a new crank, rods pistons etc. not like a crate is a bad idea tho.|
|02-06-2004 12:24 PM|
|02-06-2004 01:19 AM|
|lluciano77||I think a 350 has the best gas mileage potential. For some reason 350 is a magic number. It is a good compromise between power and mileage. The 400 will get you more torque, but at some expense.|
|02-05-2004 04:37 PM|
350 vs 400
I have looked but haven't found a direct answer to this question and I hope I am not cluttering the board with something that has been discussed over and over.
I have an F1 running a 350 4-bolt with 881 heads w/ roller tip lifters and a "268" Comp Cam, 650 Holley Carb and behind it is a 350 Turbo trans and a 12 bolt GM rear end with the biggest (tallest) radials I could find. Sorry I don't have the rear end ratio or exact tire size.
I am currently going through the truck from the frame up. It will be a "daily driver" 10 miles round trip in town, 5 days a week. Weekend trips on the interstate. I am not interested in performance other than I want to be able to get on the interstate w/o getting run over and then cruise at 75-80 all day. MPG is of interest but being a realist, I know it's like wanting your cake and eat it too. The motor wasn't much on the low end, but I could cruise all day w/o a strain.
The motor is going to have to be rebuilt. Would I be better off with the CI's of a 400 set up the same way or would there not be that much difference? Someone has told me that I might get better performance and gas mileage by going with the torqueier 400.