Hi i am new here and really enjoy reading the post here you guys rock! Many years ago I assembled a 400 that was machined at a local speed shop that specialized in round track motors but it sure had power heres what it has: 400 bored .030 with TRW forged dome pistons for 5.7 longer rod cut-down to flat top pistons with 2 valve reliefs (6" rods may be the ultimate now). The only good thing here was the racing style oil holes being drilled (supposedly stronger than the slots). They fit the pistons to each individual bore along with file-fit plasma moly rings. Of course the rods/bolts had to be clearanced slightly.
The block was also a early 4-bolt main and they put screens in lifter valley holes plus installed a big block oil pump for the Canton 8qt custom pan (its like someone turned on a faucet on the Crane gold rockers. Also the block 0 decked so pistons came all way top of bore. The crank in this motor was a stock 400 but was balanced magnifluxed etc.
Additionally, I had some 441 (open chamber) chevy heads prepped w/oversize springs, true bronze guides, guideplates,3-angle valve job plus a little blending of pockets, teflon seals, big stainless valves, chambers cc'd to be exact (75cc) and I used head studs since they were reccomended plus the steam holes were drilled in heads.(Aluminum aftermarket is the way to go these days or possibly Vortek heads) in my opinion. I think i spent close to $1000.00 on these iron wonders.
This also had a small Crane cam approximately 280 duration (I am gonna go to a full roller set-up soon) It was degreed and they put in a cam button plus timing cover made for it. BTW this engine has 10:1 compression and runs well on 93 plus a little octane booster but aluminum heads can run higher ratios supposedly.
I also used a Holley 750 dp with Performer RPM manifold and bolted on a cool set of Doug Thorley tri-y headers and to keep it cool (runs 180deg. all day long) a Griffin 4-core radiator with a 7-blade G.M. clutch fan.
This is presently in my 1980 RS Camaro w/TH350 & 3:42 posi but this set-up is going in my 67 Camaro Convt. with a Muncie M20 soon with 8.5 rear with similar gearing.
But anyway this engine set-up is awesome and throttle response in the 80rs was phenominal perhaps its a good thing that I had traction problems because to hook that beast I really needed racing axles and a good traction device of some sort but i really dont wanna race just love the sound its o.k. to burn a little rubber every now and then.
Anyways I thought you might enjoy this info on another take on the 400 build-up.
heres a link to the engine builder http://www.hamnerracingengines.com/contact.htm
[ 02-12-2005, 09:27 AM: Message edited by: Camaro&HogMan ]