| Thoughts on my 405. |
Subject: Thoughts on my 405. by Durango_Boy on 2009/2/26 13:53:50 I have been building this engine for a very long time. It's actually been built once before but I scrapped the design because I wanted more compression and had to choose new heads, pistons, and cam. The block is a SBC 400, bored to a 405, with a roller retrofit conversion and I am using a GM V6 roller lifter retainer system. Here is the spec list, and the cam I had to choose from Comp now that Crane is done. At this point I picked a cam that was as close as I could but now would be the best time to pick something more aggressive is some of you feel this one will be too tame. I'm contemplating a thinner head gasket but I have to be careful about my static CR...it's already borderline on 91 / 93 and I might want to take this car on long drives. The car is not lightened much, maybe 3200 to 3300 lbs as a guess. I will have a TH2004R behind the engine, and the 3.08:1 rear end will be rebuilt using the same gears. I like torque and slow speed low RPM cruising, with occasional spirited runs. I don't play around in the upper RPMs much so high revving will be limited. Thoughts on this build? Proposed New Cam: http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=161&sb=2 SBC 400 Front Pad: T10140SA Casting: 3951511 Date: J12-72 Bore Size - 4.145" Piston Stroke - 3.75" Head Gasket Bore - 4.190" Compressed Gasket Thickness - 0.038" Chamber Volume - 64cc Dish Volume - 12.5cc Deck Clearance - 0.025" Estimated SCR - 10.15:1 405 ci (Bored +.020) 6.638 liters per cyl. 6633.85 CCs Retrofitted for V6 Hydraulic Roller Lifters 5.7" Rods 12.5cc Dish Speed Pro Pistons 64cc chamber/ 190cc Intake Runner Aluminum Vortec Heads .600" Springs Steam Holes Self Aligning Stamped Roller Rockers Vortec Air Gap Intake Manifold |
