Is there anything else that has to be done to a 350 block other than boring , in order for it to be ready for assembly? also i plan on using 76cc heads what size domed piston will i need to acheive a good decenty high compression ratio?

Balancing the rotating assembly on a 383 is very wise. Big stroker, big balance problems if its not close. Align honing the main journal isn't a bad idea either if you can spare the machine work. If you're going to drive it regularly, flat tops may do the trick, will come in about 9.9:1. Assuming the following, here are some scenarios.

Cylinder head Volume (CC) = 76.00
Piston Top Volume (CC) = 0.00
Cylinder Bore (Inches) = 4.0
Cylinder Stroke (Inches) = 3.75
Deck Height (Inches) = 0.030
Head Gasket Thickness (Inches) = 0.020
Computed Compression Ratio is 9.9 to 1

Cylinder head Volume (CC) = 76.00
Piston Top Volume (CC) = -8.00
Cylinder Bore (Inches) = 4.0
Cylinder Stroke (Inches) = 3.75
Deck Height (Inches) = 0.030
Head Gasket Thickness (Inches) = 0.020
Computed Compression Ratio is 10.9 to 1

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Shawn Peterson
1969 Z28, 406SB

I just finished one, you'll need to make more clearence @ bottom of cyl. for crank. Also check for top of rod bolt to camshaft clearence if using big cam may need to machine top of rod bolts...do this before balance.

Hi. I have a 1967 toyota land cruiser. i currently have a nv4500 tranny (the ones out of the big heavy duty cummins desil dodge trucks. I also currently have the stock inline 6. It has alot of stuff done to it everywhere from heads to a non-usa distributor. In about 2 years its going to need rings and pistons because it gets alot of miles on it. Im very interested in building a 383 stroker for it. The only problem with this is I need to get the torque curve WAY WAY down in the rpm's. I would like the torque curve to be close to if not lower than the current inline 6. it puts out alittle over 300ftlbs at 2100rpm. For what its going to be used for horsepower is not needed. I need a TORQUE MONSTER! TORQUE TORQUE TORQUE! Any suggestions on a good very low RPM TORQUEY setup?
thanks

Build a 406 with an RV cam...

-Joe

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79' Z28 4-spd- built 355, TRW flattops, WP SportsmanII heads, Crane Energizer 284/284 duration .480"/.480" lift, Edelbrock Victor Jr., Holley 750cfm, Dynomax headers, dual 3" flowmasters :)

A 383 with a short cam can make 400 ft. lbs. plus at 2000rpm.

How about the Dodge diesel to go with the trans? Those make incredible amounts of torque way down low.

Shawn - your compression ratios are just a tad high . . . a typical head gasket is around .039" thick and a flat top has valve reliefs that are the equivalent to a 6 or 7cc dish. All these things lower the actual ratio a bit from what you calculated.

I got:

9.6:1 with a flat top.

10.6:1 with a dome piston.

Of course noone can be real exact until we know all the exact specs, but the above should get you in the ball park.

ps. You'll need to grind the sides of the block to clear the rod bolt nuts by at least .050" You'll also want to double check your clearance between the cam and the top of the rod bolts for cylinders 1, 2, 5, and 6 - especially if you use a 5.7" or longer rod.

Hope this helps

Eric

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68 Camaro, 383 small block with TH350 trans. 12.2's and never trailered.

[This message has been edited by Eric68 (edited 10-12-2001).]