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Old 06-19-2008, 08:03 PM
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400 Power and Torque Numbers

Hi, I am getting ready to finally start putting the 400 chevy motor together for my 82 Z-28 and was wanting to know if someone out there can give an idea of the kind of hp and tq numbers I can expect. To start, it is a stock bore 400 with the 4.125" bore and the 400 crank with 3.750" stroke and 5.565" rods. The piston sits .025" in the hole with a .045" ROL head gaskets. The pistons come in with a -12.5cc dish and are Hyper Speed Pro's with moly rings. The heads are Dart Pro 1 Aluminum with 200cc intake runners and 64cc chamber and 2.02"/1.60" valves. The ports were only cleaned of flashing. The valve train is all Comp Cams with Beehive springs, hydraulic roller lifters, pushrods and Pro Magnum 1.6 Roller Rockers. The cam is a Trick Flow Retro Hydraulic roller unit with .563"/.574" lift and .230"/.234" @ .050" and 110 LSA. The intake is an air gap dual plane with a 770 Holley Vac carb and a set of Hedman shorty style headers.I am curiuos what this combo will have. Any ideas? Thanks in advance for any input from anyone.

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Old 06-20-2008, 04:20 PM
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Originally Posted by cc82z-28
Hi, I am getting ready to finally start putting the 400 chevy motor together for my 82 Z-28 and was wanting to know if someone out there can give an idea of the kind of hp and tq numbers I can expect. To start, it is a stock bore 400 with the 4.125" bore and the 400 crank with 3.750" stroke and 5.565" rods. The piston sits .025" in the hole with a .045" ROL head gaskets. The pistons come in with a -12.5cc dish and are Hyper Speed Pro's with moly rings. The heads are Dart Pro 1 Aluminum with 200cc intake runners and 64cc chamber and 2.02"/1.60" valves. The ports were only cleaned of flashing. The valve train is all Comp Cams with Beehive springs, hydraulic roller lifters, pushrods and Pro Magnum 1.6 Roller Rockers. The cam is a Trick Flow Retro Hydraulic roller unit with .563"/.574" lift and .230"/.234" @ .050" and 110 LSA. The intake is an air gap dual plane with a 770 Holley Vac carb and a set of Hedman shorty style headers.I am curiuos what this combo will have. Any ideas? Thanks in advance for any input from anyone.
I came up with 440HP@5000rpm / 509TQ@3500rpm Peaks with small tube headers & mufflers on DeskTopDyno. May be more, but I didn't know what your heads flow so I entered Wedge/FullyPorted/LargeValves w/the valves sizes you listed. Showed 485TQ@2000rpm, Stump Puller.LOL!
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Old 06-20-2008, 04:52 PM
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Thanks for the reply, I am hoping it is strong on torque starting down low. It is the torque that gets it moving they say. Dart says 264cfm @ .500" lift/28" on the intake and 180cfm @ .600" lift/28" on the exhaust for an out of the box head. As I said, I did some clean up work of the parting lines from casting in the ports, no major bowl work other than what Dart did. Again thanks for the reply, sounds good and I hope to have it up running soon. I just picked up my reconditioned rods with new ARP bolts and Speed Pro Hyper pistons. I just need to finish cleaning to get the block read for some gloss black engine paint. I'll let you know how it runs when I am done. Thanks.
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Old 06-20-2008, 05:20 PM
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HP/TQ numbers should be close. The Flow data chart I used had Intake255cfm@.500 lift, In.268cfm@.600 & Exhaust 177cfm@.500 lift., Ex.183cfm@.600
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