Cliff Notes:

275rwhp/356rwtq, bumped up timing 6* and got 287rwhp/374rwtq



After doing several mods (heads, 1.6's, longtubes, ported intakes, etc...), some will recall that I had very bad luck on the dyno....soon after I found out I had a wiped cam lobe and a semi clogged catalytic converter.

http://forums.corvetteforum.com/show....php?t=1660265

anyway...
Went back today to see if my luck had changed. Car's been running nice with new $60 Summit cam/lifter package. I did have a few CEL issues that I traced to a bad CTS sensor connector. On the 60 mile drive up, I felt that car was "close" to running as good as it probably could. Very smooth, no driveability issues, no idle issues, all was well....

Tuning parameters were as stock....6* base timing, 38psi base fuel pressure.

Fresh off of I-95, I made a 2200-5800rpm pull....

http://home.comcast.net/~rel3rd/wsb/media/373752/site1437.jpg

http://home.comcast.net/~rel3rd/wsb/media/373752/site1438.jpg

As you can see, there is plenty of torque damn near everywhere, and no TPI "cliff" where horsepower dropped off rapidly, as many insist every Long Tube Runner intake will do. I love a broad, flat power curve and this car has it. A backup pull was near identical.

After nothing more than a base ignition timing "bump" up to 12* (something else that many say is a worthless mod), we made another pull (2200-5400 rpms)...This pull wound up being best of the day...and what I ended up with. My a/f ratio was right where I wanted it, hovering around 12.8:1, and stayed pretty constant throughout rpm range.

Again, very nice broad and flat graphs, which makes for a fun street car.



Still nice and torquey...
http://home.comcast.net/~rel3rd/wsb/media/373752/site1440.jpg

Overall, I cannot complain at all with end results of this combo. I have about $2000 invested in engine mods and I wanted a lower rpm, decent idling combo that didn't "need" a chip to run decently. I honestly cannot see where any chip can improve what I already have, to be honest. Alvin @ pcm4less said that my stock 1985 #870 pcm should stay right on the money as far as a/f ratio, and he was right.

Combo is as follows:

Summit (TFS) 170 heads (2.02/1.60 valves)
Crane 1.6 roller rocker arms
Summit 1102 camshaft (hydraulic flat tappet)
self ported 3860 Edelbrock base intake
self ported and siamesed SLP runners and plenum
24# Bosch (Ford Racing) injectors
Hedman Elite 1-5/8" longtube headers
2-1/2" front & rear Y pipes, gutted cat
Dynomax Ultra Flo stainless mufflers

 

awesome im very happy with that, mainly for the fact that i would like to do this build up for a senior project because its cheap, kinda compared to something else


Very good numbers!

 

Thanks. I'm very pleased with how it acts and runs.

 

I'm impressed. I have the next larger Summit cam (214/224 .442/.465) and with my ancient 461 fuelie heads and questionable ECM tune, I'm making nowhere near the power you are.

 

Thanks Jim. What kind of power are you making?

 

Hey jim, whats the part # on that cam thats a bump up?


thanks, Steve

 

Not much.

I've never dyno'd the car, but I run 14.1@97 at the track with 8 year old tires. With good tires the car is maybe a high 13 second car. The worst part is that I have absolutely no power at all below 3k rpm, and I assume this is mainly due to the heads. Those old 461s only made power in the old days because the cars ran solid lifter cams with huge lift and spun to 7k rpm.

I've got a set of SDPC vortecs sitting in the garage waiting for me to come up with the money for a Vortec stealth ram and a new cam.
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1103
http://store.summitracing.com/partde...3&autoview=sku

 

I hear ya Jim.
I had two past 406 powered rides with 461 heads and neither ran as good as they probably should have. One was a 70 Chevelle, the other was a 77-1/2 Z28 (which actually had 461X heads). Both ran mid 12's about 15+ years ago, but they both had Comp Cams 305 Magnum camshafts, single plane intakes, 3500 stall converters, 410 gears and big old 750 double pumpers...I'd love to have either car back in the driveway...

That was way back when people thought the 400 engines were junk and you could buy one, with a whole decent car still hooked to it, for $200....