View Full Version : 400 w/283 crank - worth doing at all? Please read and reply
01-05-2005, 02:40:00 PM
Okay, here's something I've been curious about for some time. We all know that a 302 can be created using a 327/350 block and 283-size crank. We know that a 377 is a 400 with 350 crank.
Here's an idea: what about building a 400 with a 283 crank? Unless I miss my guess, it would breathe better due to the 4.125" bore, but spin to the moon because of the 3" stroke.
Yes, I know you'd have to use bearing spacers, let's overlook that for a moment. Can someone with desktop dyno run this combo against a 302, assuming all other components are identical?
01-05-2005, 04:01:00 PM
Could you do it? yep A better way would be to use the large journal 302 crank, otherwise you need bearing spacers to go from the 2.650 mains all the way down to 2.300, may be tough to find.
Worth doing? that's in the eyes of the beholder. Small cubes are better suited to light cars with stiff gearing, our heavy Camaros work better with torque.
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A Canadian, EH? (with a 10 second street car)
01-05-2005, 04:47:00 PM
Oh man, that thing would rev....a 321!
01-05-2005, 06:15:00 PM
I've seen it done... they do love the RPM's
70 Z UC
01-05-2005, 10:29:00 PM
Ran one in 03 in the Sprint Car. I was using a 4.030 block with 3.500 stroke before hand. Switched to 400 block with a 3.00 stroke for the last five races. I lost ALOT of bottom end torque, and never found the top RPM. It would wind like a mo fo, and didn't want to stop. I went back to the 350/3.500 because I could not gear the car to pull off the corners as well. I would think it would be great for Bonneville/Silver State challange though.
PS: Heads/cam/induction were the same with both combos.
01-06-2005, 03:30:00 PM
So let's say for a minute that you take this beast and build it with, say, 190cc AFR heads, a Z28 dual plane, 850 Holley and a Duntov 30-30 with 1 3/4 headers... what should it do? (I don't have desktop dyno) Will it ever run out of breath?
01-06-2005, 05:26:00 PM
<font face="Arial,Verdana" size="2">Originally posted by rockheadrocks:
Will it ever run out of breath? </font>
LOL probably not http://www.nastyz28.com/ubb/wink.gif
01-06-2005, 05:40:00 PM
11.40 @ 116 in a 3700# car with 4.11's and a 5-speed.
01-06-2005, 08:04:00 PM
I don't think anybody makes main bearing spacers for that combo anymore-I looked into it once and could not find any. You're gonna have to use a LG 327 crank or a DZ302 (or MO302 too, I think) and use the Clevite thick-wall bearing spacers. One thing is for sure, depending on rod length, cylinder wall loading could end up being a non-issue and that's a very good thing for a production block 400!
01-07-2005, 11:09:00 PM
With half decent modern parts, it would be an 8,500 rpm motor EASY!!!
Just cam, gear and tire accordingly AND I will guarantee in a light car like a '64 Duece, you will supprise alotta big motored cars as well as show the high rpm, ricers, how SB power can rpm with the best of them!!
Heck, I wouldn't use anymore then a good SOTA solid lifter cam AND good valve springs to reach those rpm levels...
My old junk 301 would go 7,000/7,500 rpm anytime I wanted to clean her plugs off!
01-07-2005, 11:22:00 PM
z/28 manifold won't work as well as a good single plane like a victor jr or a tunnel ram...
01-08-2005, 12:01:00 PM
Actually, with as small as the engine is, a Performer RPM would probably provide great airflow, even in the high RPM's.
01-10-2005, 12:04:00 AM
7,000 to 7,500 rpm with my original 350SS motor's Q-Jet and old stock, cast-iron intake so tell me about it..
AND my 350's stock, cast-iron, log exhaust manifolds too!!
All I had ta do was just put my foot in the little junk motor and wind her up until the points bounced!!