What's the rest of your setup? 10.46, nice time!

 

See my signature for info.......but all that is changing as I speak (or type). New engine, converter, and some upgraded parts. Details to come.

 

Update:

A lot has happened in the past couple of weeks. The motor is done and I'm hopefully going to pick it up tomorrow. Here's what's happened...



-After a lot of back and forth, and lots of phone calls to several places, I wound up going with a custom grind Crane cam. It's a hydraulic roller, 238/242 @ .050, 525/558 lift on a 111LSA.



-I went with an aluminum Holley Street HP 750 carb.



-The machine shop finished up all the planned machine work and installed the cam.



-The motor was dyno'd yesterday and today. The engine builder was very helpful and even did a test between 1.5 rockers on int/exh again 1.6 int and 1.5 exh. The motor didn't make any noticeable additional power with the 1.6 on the intake, so I'll be sticking with the 1.5s. He did notice my harmonic balancer had some play and had worn the keyway on the crank, so he fixed the crank and replaced the balancer. The old HEI distributor that I had was causing some issues, so he ended up replacing it with a new MSD unit and actually picked up 20hp with that alone. I had been running a 4 hole 1" spacer, but he tested a 4 hole spacer, open spacer, and no spacer to see what the motor liked best. It actually lost power up top while gaining nothing on the low end. The motor liked the open spacer, gaining 5hp... so I'll pick one of those up, mostly just to keep the carb a little cooler.



So... on to the numbers!



-Peak HP was 505 @ 5500, but even better was it carries that peak to 6500 with only a few hp loss.

-Peak TQ was 520 @ 4000 which is carried across the graph, and its making about 450tq as low as 3000.



I'll post the exact power band and dyno graph when I get them. Needless to say I'm pretty pumped. This landed right where I wanted to be! I agonized for a while over the cam selection, but from a performance aspect the power band is right where I wanted it. Now we'll see how it is in the car!

 

Congrats! That will make for a fun street build with the nice wide powerband. The smallish ports account for the early torque and the flattening out of the power above 5500. But flattening out isn't bad, at least it isn't dropping off.

Mike

 

Very nice! That is now a very very similar engine to the one I built last year for my Vette. As I've not seen a dyno with it, it's good to see numbers in the ballpark I expected, though mine seems to hang on longer in the top end (I would have said peak power for mine was around 6500, I normally shift it around 7000). I love it in my car, pulls hard everywhere. What compression ratio are you at?

Mine is:

- 11.1:1 compression ratio

- Ported Edelbrock Performer RPM heads (no flow numbers unfortunately, but they came off a hyd flat tappet 383 with 10.2:1 compression running consistent 10.9@121 times in a ~2800lb car on small slicks so I figure they're ok) - the stock numbers show these flowing a bit less on the exhaust all round and a bit less at low lift on the intake, but a bit more at higher intake lifts.

- 238/242@.050 Crane hydraulic roller cam and lifters, .558/.558 lift, 300/304 adv. duration

- 1.5 roller rockers (Yella Terra)

- Performer RPM intake (not Air Gap)

- Fitech fuel injection controlling ignition via MSD dizzy/coil/6al

- .060 over, Probe forged pistons

- 6" Scat rods

- 3.75" Scat 9000 stroker crank

- 4 bolt main 010 GM block

How do you fit it under the hood with the intake spacer? I have an open spacer that I'd love to run, but no clearance, and I thought that the '79 hood had more clearance than the '80?

 

Nice, your setup sounds similar.

My CR was 11.0:1, but after the recent rebuild and decking the block it's probably more around 11.1 or 11.2 now. Yeah, I was aiming to keep my powerband a little lower where I drive the car mostly on the street, I don't want to be spinning it to 7k.

There's some pictures of my car at the beginning of the thread. I run an aftermarket version of the L-88 hood, it's a high-rise 4" over the original L-88 hood. That's how I fit everything.

 

Got the motor today, it's back home safe and sound. It looks great and the dyno results were even a little better than I thought. Peak numbers are the same 506/520, but the curve is sweet! It makes at least 500 lb/ft from just under 3,000 all the way up to 5,200! HP is right in the 500 range from 5,200 to 6,100. It's gonna be a stout street motor, I can't wait to hear it!

Here are the dyno results​​​