460 RHS block build at Nelson Racing Engines
09-16-2010, 01:12 PM
#61
I would have optioned for shorter rods myself. Good luck on the build. Those RHS blocks sure do look promising. Is there any information on the limits of these blocks where the bore size in concerned? I read they are sold as a 4.125 or a 4.165 bore block but it doesn't say anywhere what the MAX recommended bore size would be?
09-27-2010, 09:06 PM
#63
= lets hope the rings seal...
I would have optioned for shorter rods myself. Good luck on the build. Those RHS blocks sure do look promising. Is there any information on the limits of these blocks where the bore size in concerned? I read they are sold as a 4.125 or a 4.165 bore block but it doesn't say anywhere what the MAX recommended bore size would be?
I would have optioned for shorter rods myself. Good luck on the build. Those RHS blocks sure do look promising. Is there any information on the limits of these blocks where the bore size in concerned? I read they are sold as a 4.125 or a 4.165 bore block but it doesn't say anywhere what the MAX recommended bore size would be?
Lunati didn't offer a shorter rod, but Wiseco put a lot of thought into these pistons and the RHS sleeve design helps as well.
Ok.. so a few days of machine work at Nelson Racing followed by three days of building and I'm dynoing the 460 RHS engine tomorrow at Westech Performance.
Any guesses?
The 454 made 650 there and this one should make a bit more due to the better heads and a slight bump in compression (11.5:1)
A very detailed build, we flowed the Mast heads and then modded the valves to give more flow in the low to mid range area.. should be a torquie sucker.
09-27-2010, 09:08 PM
#64
Tom (at Nelson Racing Engines) also port matched the FAST intake to the heads and cleaned it up a bit.. hey, every bit helps.
We didn't build this to make some crazy high "magazine number".. if so it would have been solid with a valvetrain capable of reving higher.. we want lots of low and midrange torque given how we use the car.
Should know tomorrow.
We didn't build this to make some crazy high "magazine number".. if so it would have been solid with a valvetrain capable of reving higher.. we want lots of low and midrange torque given how we use the car.
Should know tomorrow.
09-28-2010, 08:35 AM
#67
It's a GM front cover.. the rear cover is specific to the RHS block but the front cover doesn't care that the cam is raised. The cam sensor doesn't need to be moved since it's still in a position to read the sprocket even with the raised cam.
09-28-2010, 07:14 PM
#68
Drum roll....
Now I forgot my small camera at the dyno so no video yet. I also shot the run on the screen so you can see all the numbers as well as the vid in the dyno room. I will also have the list at various RPM along with all the BMEP numbers.
So.. the best pull was...
719.5 hp
662 tq
Corrected numbers, pump gas, 28 degrees of timing.
On this pull we lugged the dyno down low, it was a bit rich but we made over 400 lb-ft at 2.500.
Peak hp was at 6.200 and the engine easily pulled to 6,700 with no float. Pretty sure it could pull to 7,000.
Good BMEP numbers, which show the heads were really working well, especially in the middle range.
Also, this was a "hero" pull.. we were nailing down consistent 705/708 pulls and let the engine set for 5-10 minutes and then made this pull.
Should be enough.. lol
Now I forgot my small camera at the dyno so no video yet. I also shot the run on the screen so you can see all the numbers as well as the vid in the dyno room. I will also have the list at various RPM along with all the BMEP numbers.
So.. the best pull was...
719.5 hp
662 tq
Corrected numbers, pump gas, 28 degrees of timing.
On this pull we lugged the dyno down low, it was a bit rich but we made over 400 lb-ft at 2.500.
Peak hp was at 6.200 and the engine easily pulled to 6,700 with no float. Pretty sure it could pull to 7,000.
Good BMEP numbers, which show the heads were really working well, especially in the middle range.
Also, this was a "hero" pull.. we were nailing down consistent 705/708 pulls and let the engine set for 5-10 minutes and then made this pull.
Should be enough.. lol
. 
09-29-2010, 07:56 AM
#74
09-29-2010, 04:53 PM
#77
TECH Apprentice
iTrader: (1)
Join Date: Oct 2006
Location: NJ
Posts: 374
Likes: 0
Received 0 Likes
on
0 Posts
Awesome results! Great build, those big cubes, Mast/PI heads, and FAST ls3 are delivering the goods. From the sounds of it, it is a real deal streetable/reliable setup. Enjoy it. What car is it destined for?
