davepl

That's pretty decent, must be good cams and head. With the stock heads, stock intake, as close to stock as possible for the cam. Here's my dyno sheet from the 396, which made about 323 on a rated 310.




I'll post the 427 when we're done. Still need to re-run it with the larger needle and seat for a final number!

ajrothm

Yeah, ours was a solid build...I was a little disappointed with the power honestly.... But after the fact, I found a couple issues... First I thought was had a #4779 carb (750 DP) and in fact it was a #4777 (650 DP), it was pulling 1.7 hg of vacuum at WOT so its a restriction.

Next issue was we were getting a weird misfire up top, you can see it in the HP curve. This ended up be due to the TI ignition coil we were using....I'm not sure how much power it hurt but, it definitely ruined the curve.

I was hoping to make 500hp and be completely stock appearing but...Not even close.

Its a .060" 396 (408), #6223 steel crank, custom Racetec pistons, Scat I beam rods, stock rectangular port heads with a 3 angle VJ. CStraub hyd roller 237/245*

Even with the rec port heads and decent size cam, it drives great, basically like the stock 396/425hp did. No cam surge or bucking, good idle, pretty much like a stock car.

Now I have the factory Holley 780 cfm restored and on it, no more ignition misfires etc.... Runs pretty decent in the car.

No doubt some real headers, and the 780 would make 470-475hp....... still not great but....decent for a cruiser.