|
418 RHS/INDY LA-X Head Motor on Dyno
#788624
08/30/10 08:37 PM
08/30/10 08:37 PM
|
Joined: Jan 2003
Posts: 8,547
State College, PA
RyanJ
OP
moparts member
|
OP
moparts member
Joined: Jan 2003
Posts: 8,547
State College, PA
|
340 block 4.08" bore
Eagle 4340 4.0" Crank
6.123" H beams
KB Forged dish pistons
10.3:1 Compression
Milodon 7 QT Pan, Moroso electric water pump
INDY/RHS LA-X heads, 2.055"/1.60" valves
Heads got 5 angle valve job, back cut intake valves, bowl ported & little pushrod pinch work. No flow #'s
1.5:1 Rockers
Bullet Solid "street" roller, 264/268 @ .050", 108 LSA, .604"/.594" lift, Herbert lifters
Crane 3/8" pushrods
INDY 360-3 Oval port intake converted to std pattern/rectangle port.
Ran 3 different carbs on it, 950HP, 750 Proform, 830 Holley
The 950 worked best... the 830 was junk, The 750 was only down 3 HP, but off about 12-15 FT Lbs, & actually moved TQ band up about 300 RPM for some reason....
Never dynoed anything with magnum based on heads on it before.. Thought this combo may eak out 550, & was surprised when we surpased that on the 2nd pull.
The INDY intake was a wildcard & did what I hoped it would do.... it made TQ... It would have been alot easier to run a victor or SV on this combo but I decided early on in the going that I'd try an ICH -3 due to runner length. This motor actually made better TQ than a 12.5:1 416 Edelbrock that had better heads, more cam etc. That had a SV on it... Granted that one made 50 more HP up top, but could not match this one for TQ. & the INDY was not hurting HP by any stretch of imagination....
I guess biggest surprise I had was how much timing it wanted.... was not happy making power with less than 38 degrees in it, would not have expected that...
This will be a real nice little street motor.... lot's of TQ right off the bottom, nothing radical, easy to work on... simple & straightforward.
Those RHS heads definitely work really well, without alot of... well work. For a more mild motor, they are by far best bang for buck head out there, especially considering how high E heads have gotten in price. Just have to be willing to live with the weight penalty of iron & the cooling differences etc.
|
|
|
Re: 418 RHS/INDY LA-X Head Motor on Dyno
[Re: j.mcconnell]
#788627
08/30/10 09:12 PM
08/30/10 09:12 PM
|
Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
dusturbd340W5
master
|
master
Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
|
hey Ryan is there a Indy intake that will bolt to my Indybrock heads.
oh these heads are on a 9.350 deck
Last edited by dusturbd340W5; 08/30/10 09:14 PM.
70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake
best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
|
|
|
Re: 418 RHS/INDY LA-X Head Motor on Dyno
[Re: B1Fish540]
#788632
08/30/10 09:43 PM
08/30/10 09:43 PM
|
Joined: Feb 2006
Posts: 1,051
The Great White North
RAMM
super stock
|
super stock
Joined: Feb 2006
Posts: 1,051
The Great White North
|
KB's with a dish in .08" OS--not that I know of. 6000+ rpm peak hp on a 418 ci with that CS? BIG cam though, WOW! J.Rob
2009 PHR\EMC Competitor
2010 PHR\EMC Competitor
2011 PHR\EMC Competitor
2012 PHR\EMC Competitor
2013 PHR\EMC Competitor
2014 HotRod/EMC Competitor
2015 HotRod/EMC NoShow
2016 HotRod/EMC 3rd place SPEC Bigblock
2018 HotRod/EMC 7th place G3
|
|
|
Re: 418 RHS/INDY LA-X Head Motor on Dyno
[Re: MIKES_DUSTER]
#788634
08/30/10 09:46 PM
08/30/10 09:46 PM
|
Joined: Sep 2008
Posts: 2,840
Flint, Michigan
B1Fish540
master
|
master
Joined: Sep 2008
Posts: 2,840
Flint, Michigan
|
Quote:
Quote:
pump gas? 
10.3:1 compression,I would hope so!!! 
With iron heads i would not bet on it.
|
|
|
Re: 418 RHS/INDY LA-X Head Motor on Dyno
[Re: quick77rt ]
#788636
08/30/10 09:53 PM
08/30/10 09:53 PM
|
Joined: Jan 2003
Posts: 8,547
State College, PA
RyanJ
OP
moparts member
|
OP
moparts member
Joined: Jan 2003
Posts: 8,547
State College, PA
|
Quote:
Outstanding 
Ryan, What do you think this motor would do with the same prep work on a set of eddie or indybrock heads.
What would be the approx cost of a set of heads done like this vs the others above mentioned?
Same prep.... 580's & would probably make little less TQ, especially @ the lower RPM's Although it would have issues @ 10.3:1 with alum heads... The compression ratio this thing was going to end up with was one of reasons I ended up going with these heads on this motor (long story involving a previously machined heavily decked block, milled down pistons & other factors) This was originally going to be an Edelbrock head motor...
Edel heads with same prep would be about $550-$600 more.
There is no direct bolt on INDY intake for std bolt pattern/port heads.
& No pricing on motors on board, I'll PM you an idea of what motor like this costs.
|
|
|
Re: 418 RHS/INDY LA-X Head Motor on Dyno
[Re: cudadoug]
#788638
08/30/10 10:00 PM
08/30/10 10:00 PM
|
Joined: Jan 2003
Posts: 8,547
State College, PA
RyanJ
OP
moparts member
|
OP
moparts member
Joined: Jan 2003
Posts: 8,547
State College, PA
|
Quote:
With that much stick, it should run on pump gas on the pump AND in the car.
Ryan, how could no have any flow numbers???? Grrrr
What is the deck height/head gasket/quench combo?
Are those heads cool or what??
Yes pump gas. I did not do a cyl press test, but I'm sure it's not up there....
Flow #'s not important to me
Don't ask about deck height. I'll just say it has a .040 gasket, piston is now @ zero deck. Block came to me as a used piece that was heavily decked & I had to machine pistons to set @ zero.... was just a pain.
Heads are pretty cool for what they cost. This was upgrade set with some custom valves ICH had made for roller cam use, hence why the 2.055 head.... I actually set these up @ 1.82" IH, but I had plenty of height to kill off. I think I could have done a 1.90 in it.
|
|
|
Re: 418 RHS/INDY LA-X Head Motor on Dyno
[Re: cudadoug]
#788640
08/30/10 10:18 PM
08/30/10 10:18 PM
|
Joined: Jan 2003
Posts: 8,547
State College, PA
RyanJ
OP
moparts member
|
OP
moparts member
Joined: Jan 2003
Posts: 8,547
State College, PA
|
Quote:
Thanks Ryan. One (but 3 parts) more and I'll leave it alone (maybe)...
Is the runner length of the Indy intake longer than the SV, and if so how much and how do you think that effects the power.
Yes it's visibly longer than the SV, although I have not measured the SV. I have never put an INDY on anything that has not ran quite well, did'nt matter if it was a 500 HP flat tappet 340, Dirt track W2 360, 450" INDY -1 motor making 760+ HP. It is just a great very versitile intake manifold that works well on a wide variety of engines. I'd loved to have dynoed this thing with this intake & then an RPM Air gap.... but was'nt to be.
|
|
|
Re: 418 RHS/INDY LA-X Head Motor on Dyno
[Re: RAMM]
#788641
08/30/10 10:32 PM
08/30/10 10:32 PM
|
Joined: Jan 2003
Posts: 8,547
State College, PA
RyanJ
OP
moparts member
|
OP
moparts member
Joined: Jan 2003
Posts: 8,547
State College, PA
|
Quote:
KB's with a dish in .08" OS--not that I know of. 6000+ rpm peak hp on a 418 ci with that CS? BIG cam though, WOW! J.Rob
KB745, Avail in 4.00", 4.03", 4.04", 4.06", 4.07", 4.08"
Learn something new every day 
|
|
|
Re: 418 RHS/INDY LA-X Head Motor on Dyno
[Re: all spooled up]
#788643
08/30/10 10:44 PM
08/30/10 10:44 PM
|
Joined: Jan 2003
Posts: 8,547
State College, PA
RyanJ
OP
moparts member
|
OP
moparts member
Joined: Jan 2003
Posts: 8,547
State College, PA
|
Quote:
those rhs/indy heads have w2 w5 intake bolt spacing?????
No. I changed the bolt pattern on the intake.
|
|
|
|
|
