I bought a running 396 a while back and because it was running it just put it in my car without taking it apart and inspecting it. Well last week I spun multiple rod bearing when I took it north of 6500rpm for a few seconds. So I tore it down. The casting number says its a 396/402 car block. I measured the bore. It's 4.155. So that's .060 over for a 396 or .030 over for a 402. Would it be safe to take it another .030. Ive never done anything with a 396 before. If its safe to bore one more time I plan on using a forged .580 dome piston. With a set of 881 heads. Should make 10:1 compression. Edelbrock rpm intake. Already have a brand new q750 double pumper quick fuel. I'm gonna use stepped headers. Only thing I'm not sure on it cam. I'm running a 3200 stall with 3.73 gears in my chevelle. Yes its a street car but I'm not worried about drivability. So I'm wanting to cam it to run make as much power as possible between 3000 and 6500 probably going to go with solid flat tappit. Any recommendations on what cam to use with this combo. Thanks.
The cam I'm thinking of is a comp xtreme energy. (11-678-5) lift is .590/.598. Duration is 282/290. At .050 is 244/252. Says 2400-6800 rpm with 3000+ stall.
781 heads not 881 heads.
The casting number says its a 396/402 car block. I measured the bore. It's 4.155. So that's .060 over for a 396 or .030 over for a 402. Would it be safe to take it another .030.probably NOT without somebody sonic testing the block to verify cylinder wall thickness...http://www.moparmusclemagazine.com/techarticles/engine/mopp_1112_engine_block_sonic_test_quick_tech/most of the forum activities are over at the chevyhiperformance dot com forums..your user name and password will work there also..
click the source interlink media icon at the bottom of the page and it will open a new window.. then click the our sites tab... that will take you to most of the magazines..
think oval track type solid lifter cam to achieve power goals,like maybe comp #11-610-5? 250-260 degree at 50,604-629 gross lift,108 degree LSA .if the heads have not been upgraded to 2.19x1.88 valves,you should do so! a dyno simulator says it LOVES an 1150 cfm carb!!.....good luck