Mast Motorsports builds Ultimate NA LS Pump Gas Street Motor (870hp/665tq)
10-19-2010, 05:54 PM
#1
FormerVendor
Thread Starter
Join Date: Mar 2007
Location: Nacogdoches, TX
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
Mast Motorsports builds Ultimate NA LS Pump Gas Street Motor (870hp/665tq) Mast Motorsports is pleased to share the dyno results of our RHS based 466 using a set of our PXR Canted Valve heads and Hilborn Individual Runner system. This was our first chance to dyno using our PXR Canted Valve Heads and we feel the results speak for themselves. The engine will find its home in a 56 Chevy and will utilize our new M-120 WBO2 ECM with Bank to Bank wideband closed loop control.
Published Engine Specs:
466 Cubic Inch, 4.300” Stroke 4.155” Bore
RHS Tall Deck Block
Callies Dragonslayer Crankshaft and H-Beam Rods
Mahle Custom Canted Valve Box in Box Pistons
Mast Motorsports PXR Canted Valve Heads
Hilborn Individual Runner Intake
Solid Roller 60mm Cam Core
Runs and Dyno tested on 93 Octane
870 Peak Horsepower at 7800 RPM using 93 Octane!
Goto our Facebook page to see the dyno pull!
Published Engine Specs:
466 Cubic Inch, 4.300” Stroke 4.155” Bore
RHS Tall Deck Block
Callies Dragonslayer Crankshaft and H-Beam Rods
Mahle Custom Canted Valve Box in Box Pistons
Mast Motorsports PXR Canted Valve Heads
Hilborn Individual Runner Intake
Solid Roller 60mm Cam Core
Runs and Dyno tested on 93 Octane
870 Peak Horsepower at 7800 RPM using 93 Octane!
Goto our Facebook page to see the dyno pull!
10-19-2010, 06:02 PM
#3
TECH Apprentice
iTrader: (1)
Join Date: Oct 2006
Location: NJ
Posts: 374
Likes: 0
Received 0 Likes
on
0 Posts
That is just nuts!! I heard about this build as I am building something extremely similar. The #'s are very close to my calculated #'s. Congrats...that is a GAME CHANGER on real 93 octane. What is the exact static CR? I was told a #, but I want to confirm it.
Congrats again, and congrats for teaming up with Cary. These heads are the last word in LSx heads right now.
Congrats again, and congrats for teaming up with Cary. These heads are the last word in LSx heads right now.
10-19-2010, 06:15 PM
#4
Very impressive hp per cubic inch, especially for an engine of this size. Look forward to seeing some photos.
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
10-19-2010, 07:11 PM
#6
I've always said the LS engine needs a canted valve street head, it looks like it has one now. 
Congrats, that's just badass...
More specs on the head please.
But, uh, what's wrong with the engine/dyno in the video? Brake running out of water? I had the pickup screen get mucked up and do that once.
Congrats, that's just badass...
More specs on the head please.
But, uh, what's wrong with the engine/dyno in the video? Brake running out of water? I had the pickup screen get mucked up and do that once.
Last edited by Brian Tooley Racing; 10-19-2010 at 07:29 PM.
Trending Topics
Cam specs please 
10-20-2010, 12:37 AM
#12
Congrats guys....incredible numbers and a beautiful power curve.
Look forward to taking a peek at this new head at PRI....and also checking out the new two piece single plane intake. Thats another hardcore really nasty piece!
Im thinking this may be the head I saw in the works a couple of years ago but I dont remember it well enough to be sure.
See you guys in Orlando!
-Tony
Look forward to taking a peek at this new head at PRI....and also checking out the new two piece single plane intake. Thats another hardcore really nasty piece!
Im thinking this may be the head I saw in the works a couple of years ago but I dont remember it well enough to be sure.
See you guys in Orlando!
-Tony
10-20-2010, 10:30 AM
#16
Teching In
