Valve Stock Caldwell Hennessey
Lift(") Intake Exhaust Intake Exhaust Intake Exhaust
0.10 61 54 61 59 62 54
0.20 118 115 125 116 122 127
0.30 167 155 178 170 179 179
0.40 203 180 214 204 228 200
0.50 229 185 247 210 261 209
0.60 242 187 270 214 274 214
0.70 n/a n/a n/a n/a 282 217

Suffice to say I'm very much looking forward to some dyno and dragstrip figures when these heads are installed in early June! In the meantime, thumbs up to Hennessey & team for a great porting job.

That is not a surprise to me. I can tell you the Venom 650 heads I got from HMS were MACK DADDY!!! They were awesome. They were on the very ragged edge for performance. You will make huge power with those heads and the stock cam. I cant wait to see your RWHP numbers,

Regards,

I missed the slam on Caldwell. I also missed the statement that any tuner is better than Caldwell. I think Ben was merely stating a fact - that the HMS heads had better flow than he expected - and better than the posted imformation in regards to Caldwell. I doubt any one on this board thinks that anything Caldwell has done is less than spectacular. They have been put in the position of reference. Since they are the Standard, why not report that the HMS heads had good flow numbers. I for one applaud the information in the post. Good job Ben.

Regards,

Not to toot our collective horns, but the engine building experience at HMS is WAY DEEP. The current players have been responsible for everything from ASA motors to Pro Stock and Stock Eliminator to Silver Crown. Caldwell was in the right place at the right time, Ed Pink could have done the same work...as could Wegner, Chapman, et al. If you don't recognize those names....I'll give you a clue....THEY DON"T WORK FOR CDI AND THEY MAKE CARS GO FAST FOR EXTENDED PERIODS OF TIME. We at HMS can do the same thing....chances are you could come closer to affording one of our setups than you could a similar package at Caldwell.

EASE UP ON THE CALDWELL PROTEIN SHAKES...they are distorting reality for you Fred.

There are 4 Vipers entered at Le Mans, as well as many other cars. Caldwell engines are in at least 1 Viper (I think the other 3 Vipers are also powered by CDI engines) and 3 LMP cars.

Any other Viper tuners powering Le Mans rides?

I do like value for my $$$ and should I be fortunate to have the spare cash I would be happy to spend it with CDI, EMI, Dan Cragin, all relatively close to home and all with happy customers.

Martin, The topic is "Better than Caldwell"

Caldwell does not post on this board. So when someone comments "Better than Caldwell" I want to make sure the owners who do not know all the tuner's, at least know who is on first!

------------------
djdunit@victoryvipers.com
'94 RT/10-'97 SST
949.788.6335

More generally, as many of you know I've been methodically upgrading my Viper and testing after each round of upgrades to provide some useful data points to the Viper community. I report both the welcome news (like these flow numbers) as well as the unwelcome (a 16HP peak gain on my '01 when headers & catback were added). I trust that, although I may ruffle some feathers with the data I report, on the whole the information I'm providing is a net positive to other board members and will help guide others who are contemplating proceeding down the modification path.

------------------
2000 triple black RT/10, BTR Belanger Tri-Y headers, bullet cats, 3" catbacks, 3.54 gear, lightweight flywheel, S&B filters, smooth tubes.

------------------
Fred Kinder

------------------
Alan Modzelewski
98 Red GTS

And I know exactly how this industry operates. Primarily on BS! Only thing that keeps the aftermarket industry from going under is the fact that most of its customers are too stupid to know they've been ripped off. Why do you think all those kids drive around with 5 inch tips on their exhaust pipes?

Flow numbers are interesting because they are suggestive of the degree of performance improvement one can expect from swapping heads. Obviously, the definitive data points will come when these heads are installed and the car is re-dyno'd and re-run at the dragstrip. However, based on the flow numbers obtained, I have every reason to believe I'll see a 12-15% horsepower gain with the Hennessey Power Pak installed. 50-60 extra RWHP would be, if you'll pardon my saying so, "No BS"

We are happy to service Ben, Martin and many others with our Venom Power Pack, including our cylinder heads, etc. This is a great way to get your Snake from 440-450 rw hp up to and over 500 rw hp.

BTW, Fred, you should probably get a few more driving schools under your belt before adding anymore power. Have fun,

------------------
John Hennessey
Hennessey Motorsports
"Too Much Horsepower is Never Enough"