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Old 02-04-2008, 06:04 PM
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400 build ideas?

I just scored a 400sb truck motor out of the junkyard its a running motor I was looking into a 427 stroker crank kit for it with some bigger heads this motor is going into a lowered 67' C10 with a 200-4R and 3.73 gears its for weekend fun so im not really worried about daily driving I just wanna get an idea on what to do with this truck
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Old 02-04-2008, 09:52 PM
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The money that you would use on a stroker crank kit etc spend on a nice hyd roller cam+kit and good heads and a better designed exhaust system.
Or go low, low compression dished pistons, 5.7" GM rods, hyd cam, good entry level aftermarket heads and a Weiand 177ci blower with 850 carb. All using the stock GM 400 crank.
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Old 02-05-2008, 02:16 PM
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im not really worried about the money part but what kind of heads and cam should I run?
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Old 02-05-2008, 09:52 PM
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Considering that its a lowered truck and you'll never need high RPM power I would suggest Vortecs, AFR's will give you more power, but in a lowered truck torque matters more and the Vortecs and AFR's are pretty close there- too close to justify the added cost of AFR's in my opinion. Pick a cam with about 215/220 degrees duration @.050 and a LSA of about 106 and slap on a 6-71 blower overdriven just a tad. It'll make one mean rodding engine, with plenty of grunt to burn up all the tires you can afford. It will love gas though, it'll drink it like a fish drinks water.

Just thinkin about that engine makes me drool.
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Old 02-06-2008, 01:43 AM
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Im not sure I was thinking of running a little cr with it to make like 10.5:1
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Old 02-06-2008, 07:17 AM
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Quote:
Originally Posted by ap72
Considering that its a lowered truck and you'll never need high RPM power I would suggest Vortecs, AFR's will give you more power, but in a lowered truck torque matters more and the Vortecs and AFR's are pretty close there- too close to justify the added cost of AFR's in my opinion. Pick a cam with about 215/220 degrees duration @.050 and a LSA of about 106 and slap on a 6-71 blower overdriven just a tad. It'll make one mean rodding engine, with plenty of grunt to burn up all the tires you can afford. It will love gas though, it'll drink it like a fish drinks water.

Just thinkin about that engine makes me drool.
2115/220 is just aboove a stock cam and a blower with a 106 LSA will not work either to much over lap 114 is where you may want to start.

This engine in the link has 232 @.050 and 501 on the torque is pretty good for a 383. and with same package and Vortec heads the numbers on the dyno were very similar.
http://www.chevelles.com/forums/show...highlight=DYNO
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Old 02-06-2008, 09:32 AM
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Are you after something mild and really driveable or something more radical?

Adam
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Old 02-06-2008, 04:02 PM
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GMPP aluminum Fast Burn heads. (alternative GMPP big port Bowtie vortecs) GMPP LT-4 Hot Cam (retro fit) and 1.6 roller rockers.
If you want something a little more radical than this Use the new Edelbrock RPM "Rollin' Thunder" retro fit Hyd roller cam. #2201 and 1.5 rockers.
GMPP Eliminator dual plane RPM style hi-rise rise vortec manifold. Edelbrock #1407 750cfm carb.
Rebuild the 400 using new GMPP 5.7" PM rods and KB 147+.030 pistons.. Have the block "0 decked" and the heads drilled for the 400 steam holes and the rotating assembley rebalanced. The Stock GM 400 crank is fine. Get a new "400" balancer and flywheel. A few of the rod bolt heads will need minor clearance grinding to clear the roller cam lobes on a few cylinders. Your machinist can do this for you prior to balancing.
Use 1-3/4" long tube headers and dual exhaust.
A moderate 3000 high stall "lock up" style converter would be nice (Yank, Art Carr, Precision) if you go with the more radical Edelbrock camshaft.

Hold on tight....

Last edited by F-BIRD'88; 02-06-2008 at 04:14 PM.
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