2010 GM new Ls7 block
Callies compstar crank 4in stroke
Callies compstar I beam rods
Custom weisco pistons 12.1 comp
Hd nitrous pins
E85 fuel
Cary's Perf Inductions 285cc Ls7 heads
TD shaft 1.7 rockers
Trend 3/8 pushrods
Cary's Perf Inductions FULL Cnc Ls7 2 piece manifold
Custom Sv1 Prosystems E85 carb
Msd front drive dist, msd crank trigger, msd 7531

Headers

Custom 1 7/8 or 1 7/8 to 2 inch stepped headers


Nitrous

50-150 shot
NX sv1 plate, plumbed by Dave @ Nitrous Outlet, twin bottles etc etc

Vehicle

1977 holden 4 door
hugo built powerglide, transbrake 4000 Tce convertor
9inch 31 moser, 4.33 or 3.7 gears.
275/65/15 radials
weight - 2700lbs

im looking for optimum cams in hyd roller and a solid roller version.

aiming to make 680-720 N/a plus nitrous

 

At 2700 lbs you might need less gear with 700 or so fwhp, especially with N2O - should be a wild ride.

Do you own this block yet? For a boosted or N2O application a dry sleeved Ls3 block would be stronger and might even cost less.

 

Please research the problem associated with it's thin sleeves cracking under pressure, the best, fastest and list expensive thing to do, is to have it re sleeved using, good and strong after market pieces, before you do anything, if not after you do all the work, then you'll have to redo it all again, will take the fun of it. It has happened to too many already... You then have the option to go with the 4.185 bores and end up with a 441 Ci monster. As for the cam, don't even think about it, for just $25. have one that will be the perfect one, grind for you from the get-go. Camhelp@guerragroup.com...

 

IMO I would go with 2 to 2 1/8 stepped headers with a 3 1/2 merge collector. Cams, personally I would go solid roller and have the block machined for .903 lifters and use the Morel ultra pro 5428s.

 

As was said, re-examine using the LS7 block. They tend to go pop when the cylinder pressures go up. A much stronger setup is an LS2/3 block with Darton dry liners.

 

What's the intended RPM band of this motor? 4000-7500?

 

3500-7000 to be considerate

 

Ok. I will get back with you on this then? Kill mode cam or you want to drive it all around to?

 

90% drag 10% street

 

Ok. Your valve springs are rated to .700 lift or so? Because I would use something in the .400+ lobe lift= .680+ lift w/1.7s

 

Here is what I have come up with in a Hyd. Roller form:
254/266 .680/.680 110+2
RPM Band= 4000-7000 cam will come on strong around 4k and pull solid to 7k.
Large tube headers would be in order as well.