RHS block 461 LS engine build thread - now built, dyno tomorrow

[Steve1968LS2]

Well, at least final for awhile..






We start the machine work early next week.. everything is here, sorted and ready to go in. Only thing I'm waiting for is the custom Canton pan to be finished.

Install on August 26th at the latest.. then ready for the Holley LS-Fest and RTTH events.

[Mingus]

Final engine?
I know you added "at least for awhile" in the post but I couldn't resist. I don't think Penny will ever have a "final" anything. Like you said, "done is boring".

[Mingus]

BTW, VERY nice.
What's the specs and projected HP?

[Steve1968LS2]

BTW, VERY nice.
What's the specs and projected HP?

Well.. I'm tired of swapping engines.. gets old. lol

RHS short deck block - 4.155 bore
Mast Motorsports 12-degree LS7 bad ass heads
Lunati Pro Crank - 4.125 stroke
Lunati Pro I-beam rods - 6.125"
ARP everything
FAST 102mm LS3 style intake
CHE bushed LS7 rockers
COMP vertical bar lifters, pushrods, timing chain, etc
Moroso oil pump

We have two camshafts to try.. one is really snotty.. both are hyd.

The smaller is a just a touch bigger than the one in my 454.. the other is.. well.. bigger

Thought it would be fun to see the power differences.

Displacement is 461 cubes.. With the big cam we should be over 700.. no idea on torque but more than I need.

I will say the finish work on this RHS block is pretty damn impressive

[Vegas69]

Beautiful piece, how much does it weigh? You slacking?

[Van B]

Did the last one you built ever get put in the car?

[Steve1968LS2]

Beautiful piece, how much does it way? You slacking?

I need a scale.. but I was able to lift it out of the box without busting my spine.

[MCMLXIX]

SWEET!

From RHS website:

Welcome to the LS revolution. Engineers at RHS® have recently designed a high performance engine block for GM LS applications to meet the needs of race and street performance engine builders. To go beyond the limitations of other existing LS blocks, the new RHS® LS Race Block is available in both standard deck and tall deck height configurations. Additionally, this innovative block features a raised cam centerline and outboard priority main oiling to allow rod clearance for a 4.600” stroke and to minimize windage in the crankcase. And for quality control assurance, RHS® conducts a CT scan (similar to a medical CAT scan) on each block to ensure maximum casting precision and consistency. When you combine unmatched finishing quality with added clearance for increased stroke applications, precision computeraided design and extra surface material to allow custom machining, you get the new benchmark for LS horsepower, torque and durability.
Block Specifications:
• Designed from heavy-duty A357-T6 aluminum material
• 4.125”-4.165” Siamese cast bore walls with press-in spun cast iron liner
• Available in standard (9.240”) & tall (9.750”) deck heights with beefy .750” deck thickness
• Both standard deck (5.67”/5.87”- same as LS7) & tall deck (5.94”/6.38”) cylinder liner lengths available
• Extra long liners for standard (5.87”) & tall (6.38”) decks
• “Long arm friendly” design – Accommodations for up to 4.6” stroke with standard rod pin diameters (2.100”) & oversized 60mm camshaft
• Designed for clearance – side oil galley moved outboard & engineered rod clearance come standard
• Raised cam centerline (.388”/9.86mm) to allow larger stroke; 2 extra links in the timing chain – Timing sets available from COMP Cams®
• Bay-to-bay breathing improved with increased side window area versus LSX & LS7
• Significantly increased windage passage area under bores & around caps over LS7/LSX engines
• 6 head bolt design with full water jacket around the cylinders (based on LS7 design)
• Extra large windows in valley for access to inboard “6th” head bolt
• Main Cap surface area maximized at mating surface & large fillets from cap to cross bolts for added strength Valve Train Capabilities:
• Cam tunnel will accommodate stock through oversized 60mm roller bearing cams (includes cast-in lock screw pads)
• .842” lifters standard with material available for oversized lifter access (accepts 1.060” bushing for keyed lifters)
• In the standard deck, maximum pushrod angularity = Less than 2 degrees
• Includes Ampco 45 cam thrust plate and aluminum rear cover
• Lifter bosses designed to clear tie bar lifter
• Provisions for Gen III & Gen IV cam & knock sensors & valley covers
Superior Oiling:
• Dry sump friendly with provisions for more serious dry sump setups; includes big front & rear AN-12 side feeds
• Includes provision for piston oil squirters, cast-in & machined
• Priority main oiling, galley moved outboard for long stroke clearance
• Oil filter feed galley GM “dog bone” replaced with proprietary no restriction threaded plugs
Additional Features:
• Gen III/Gen IV compliant with race mounts for Gen I, Gen II, Gen III & Gen IV engines
• Optimized billet main caps & improved windage
• Rolled threads on all threaded holes for added strength
• Chilled main bearing bulkheads for added strength
• ARP main stud kit standard with enough material in castings to accommodate up to a ½” fastener

[MCMLXIX]

Beautiful piece, how much does it weigh? You slacking?

RHS says shippind weight of 119 lbs.

[cmraman]

Well.. I'm tired of swapping engines.. gets old. lol

RHS short deck block - 4.155 bore
Mast Motorsports 12-degree LS7 bad ass heads
Lunati Pro Crank - 4.125 stroke
Lunati Pro I-beam rods - 6.125"
ARP everything
FAST 102mm LS3 style intake
CHE bushed LS7 rockers
COMP vertical bar lifters, pushrods, timing chain, etc
Moroso oil pump

We have two camshafts to try.. one is really snotty.. both are hyd.

The smaller is a just a touch bigger than the one in my 454.. the other is.. well.. bigger

Thought it would be fun to see the power differences.

Displacement is 461 cubes.. With the big cam we should be over 700.. no idea on torque but more than I need.

I will say the finish work on this RHS block is pretty damn impressive

Didn't you just put a new motor in it? Is track Rat every going to get anything?

[Steve1968LS2]

Didn't you just put a new motor in it? Is track Rat every going to get anything?

Just a temp motor so the car would be down all summer.. Track Rat already has an engine built, the 5.3L

And right now TR is in body prep and should be ready for paint again shortly.. the rest of that build will go quickly since I everything except interior ready to go.

Built two projects sometime and you will see the time and $$$ challenges involved (three if you count Nick and Yancy's cars)

[RSX302]

Well.. I'm tired of swapping engines.. gets old. lol

RHS short deck block - 4.155 bore
Mast Motorsports 12-degree LS7 bad ass heads
Lunati Pro Crank - 4.125 stroke
Lunati Pro I-beam rods - 6.125"
ARP everything
FAST 102mm LS3 style intake
CHE bushed LS7 rockers
COMP vertical bar lifters, pushrods, timing chain, etc
Moroso oil pump

We have two camshafts to try.. one is really snotty.. both are hyd.

The smaller is a just a touch bigger than the one in my 454.. the other is.. well.. bigger

Thought it would be fun to see the power differences.

Displacement is 461 cubes.. With the big cam we should be over 700.. no idea on torque but more than I need.

I will say the finish work on this RHS block is pretty damn impressive

Sweet!

I'll have to tell my my buddy Charlie (CHE) that you will be using his rocker bushings/trunnions... If you ever want a tour of his shop let me know when you're in the area. They also have a nice set of Ti retainers. My Ford R302 has many of their parts.

[ProdigyCustoms]

They are automotive jewelry. Like Steve, I had no problem pulling ours out fo the box. My gues is 100LBS?

[Nessumsar]

I think that deserves an OMG!

And what is this talk about 2 cam choices? There should be only one, the BIGGEST. Especially if you're going to use this engine longer than a couple months...

<--- Jealous as always. Keep it coming!

[absintheisfun]

How many engines has Penny had...4? (the last of which went in something like a month ago right?

[Steve1968LS2]

I think that deserves an OMG!

And what is this talk about 2 cam choices? There should be only one, the BIGGEST. Especially if you're going to use this engine longer than a couple months...

<--- Jealous as always. Keep it coming!

Well, I enjoy good street manners and to me they arn't work sacraficing for 20-40 hp I will never miss..

[LSx_88_Ciera]

Must be nice to have the resources to change the engines instead of the oil. Do you have special stickers you place in the corner of the windshield so you know when it is time for a *SERVICE*?
Curious is it a typing or math error 4.155 x 4.125 is 447cid not 461.

[Steve1968LS2]

Must be nice to have the resources to change the engines instead of the oil. Do you have special stickers you place in the corner of the windshield so you know when it is time for a *SERVICE*?
Curious is it a typing or math error 4.155 x 4.125 is 447cid not 461.

Typing error.. 4.155 x 4.250



I do have resources, but I try to use them for good not evil. It just so happens my job is to turn out tech and sometimes that's engines. :shrug:

This sort of came up and changed my plans for a final engine.

I had the LS2.. then I had a oil pump fail so I rebuilt it.. then I stroked it to a 402 (same engine) then I built the 454 which is now going to be a 461

So in reality that's only three engines when I planned for two.

[LSx_88_Ciera]

Steve
I knew all of that just felt like giving you a hard time because I am jealous. Is Camaro Performers looking for a freelance writer I'm pretty technical and diligent.

[Steve1968LS2]

Steve
I knew all of that just felt like giving you a hard time because I am jealous. Is Camaro Performers looking for a freelance writer I'm pretty technical and diligent.

Can you take a good picture? Always looking for fresh meat.. I mean new tallent! lol

And I know you would just messin with me.. but I do get "hate mail" believe it or not...

I'm pretty lucky that my job and my hobby are the same.. and I know it. I also know that I own having my job to this website and to the pro-touring community. Won't ever forget that.