Firewalker

yep a new PULLYOURASS, I kinda got suckered into it.

Gonna Grass drag it on the 12th, up near port carling

ROTAX454

Yes, if all things are taken "back" to the GM bill of materials. He wrote that he ran a different carb and ignition. Not so much that the stock carb is slightly larger. I believe the carb set-up would make the real difference. And the ignition too. Who knows what ign curve was used in his distributor. My findings so far all show GM to be very conservative on their published numbers. GM never wants to have one of their crate motors ran on some builders dyno, and show less power numbers then they publish. Bad for business. News like that spreads like wildfire throughout the high performance market. You get the point. I wish I could find the article that was on the new ZZ572-620 HP motor. They found that motor, right out of the crate after breakin, ran well over the 620 mark at it's published RPM HP peak.

ROTAX454

Unless your really going to run the motor hard, and for long periods of WOT, the SS valves will be OK. But, that means running good fuel and propping for 5200, not 5600. Yes, change the head gaskets (while you have the heads off) to the .40 Cometic. $$$ but worth every cent.

Airpacker

Just talked to the engine builder doing Firewalkers piece. Called him to tell him his new customized ball bearinged marine distributor is ready and he told me they just dynoed the zz502 after sorting it out. 562hp at 5400, 578 lbft. That should wake the little panchanga up some over the old 330 hp

Firewalker

Yup, I have the DYNO sheet infront of me.

holds over 550 ft/lb from 3500 to 5300.

That is with a Cam change and Victor Jr. intake, still on the 800 cfm carb.
Makes about 45 more than an HP 500 carb apparentyl.

Yup the P-22 should RIP!.

RT

Kidnova

Excellent!

Firewalker

Any bets on speed, it ran 66 with the 330 on the GPS.

RT

Kidnova

Hmmmm...My 23 Nova ran +,- 57 gps with a 7.4/330. With the ZZ502/502 dropped in, 70 gps is pretty common, 69 any time and up to an all time top end of 73.1, on a cool dry day.

I'd guess your speed will be somewhere between thrilling and scary

Be sure to check your steering out REAL WELL before lighting the fuse on that rocket.

Firewalker

Thanks,

It has IMCO steering and a XR drive, soon to get a shorty lower.

It should be fun, I am used to 130mph STV's

RT

Kidnova

Sounds like you're all set. Fun....that's an understatement. Sounds like way beyond fun