400ci Motor combination ?
#2293006
04/23/17 11:58 PM
04/23/17 11:58 PM
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Joined: Apr 2017
Posts: 6 Texas
Halfast
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I have a question as to how streetable this motor combination is? I have a 400 stroked to a 499ci with a A7I balancer,Mopar stage 6 heads that have been ported, Comp 308R roller cam, RPM 4130 Crank, I beam rods, Smith brothers push rods, Crane GOLD rockers with offset and drain back mod, aluminum main caps and studs, I con flat top pistons.
Please any advise would be greatly appreciated.
Last edited by Halfast; 04/23/17 11:58 PM.
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Re: 400ci Motor combination ?
[Re: Halfast]
#2293014
04/24/17 12:17 AM
04/24/17 12:17 AM
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Joined: Aug 2003
Posts: 43,292 Bend,OR USA
Cab_Burge
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What is the compression ratio and what type and octane fuel are you planning on using? Also what are the cam specs. at .050 lifter lift and what is the lobe separation angle and where did you or are you going to install the intake lobe centers?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 400ci Motor combination ?
[Re: Cab_Burge]
#2293027
04/24/17 12:47 AM
04/24/17 12:47 AM
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Joined: Apr 2017
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Halfast
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Duration 308/308, .575 lift, 10.5 - 11.00 compression ratio. I dont know the valve spring pressure. I'm planning to run 100-105 octane.
Cam Specs: Basic Operating RPM Range: 4,000-7,200 Intake Duration at 050 inch Lift: 262 Exhaust Duration at 050 inch Lift: 262 Duration at 050 inch Lift: 262 int./262 exh. Advertised Intake Duration: 308 Advertised Exhaust Duration: 308
Last edited by Halfast; 04/24/17 12:50 AM.
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Re: 400ci Motor combination ?
[Re: Halfast]
#2293037
04/24/17 01:05 AM
04/24/17 01:05 AM
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Joined: Jan 2003
Posts: 17,907 S.E. Michigan
ZIPPY
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Sounds good to me. If that is the older 308 street roller, it would be ground on 110. It should be pretty streetable as long as the rest of the car is set up for it, And if you enjoy driving it. It seems what the driver can tolerate is Really the determining factor.
Rich H.
Esse Quam Videri
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Re: 400ci Motor combination ?
[Re: Halfast]
#2293061
04/24/17 02:06 AM
04/24/17 02:06 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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I assume these are alum heads.. with 11.0 and those specs and a nice conv its very streetable and most people would like it.. just make sure it has enough gear and stall so it gets into the revs....... and welcome
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Re: 400ci Motor combination ?
[Re: Halfast]
#2293090
04/24/17 04:04 AM
04/24/17 04:04 AM
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Joined: Aug 2003
Posts: 43,292 Bend,OR USA
Cab_Burge
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I Win
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One of the main things you need to do to help this motor run excellent is to make sure the cam is degreed into 3 to 6 degrees advanced on the intake lobe centers Your roller cam specs. are close to the same cam in the first pump gas stroker street motor I made for myself, it was 260@.050 on the intakes and 266@.050 on the exhaust lobes, ground on 108 LSA. I installed it at 106 intake lobe center (2 degrees advance) so it wouldn't spin the tires as easy as if I had installed it at 4 to 6 degrees advanced. That motor made me very happy and far exceeded my expectations It was a 4.250 stroke in a 400 block with 4.375 bore to start with, it had a set of ported big valve 906 heads which got replaced later with a set of CNC ported Eddy RPM. The head change pick that car up right at .2 ET and a full 3 mph in the 1/4, 10.49 at 126 + MPH on Oregon pump 91 octane pump swill through the full exhaust and with the six pak air cleaner on the low deck six intake and 440 carbs. I change the crankshaft to a 4.300 stroke to move the pistons up from -.025 in the hole to zero deck to raise the compression ratio from 9.25 to 1 to 10.3 to 1, that picked the car up some more also On the valve spring pressures run what the cam calls for On a solid roller cam 30 lbs. more than needed is way better than 5 lbs. to little You need to look at the coil bind on the valve springs at full open at the retainer, check that with checking springs at the retainers before setting the real springs up and shoot for .055 to .090 from coil bind on all 16 springs On your deal I would make sure what the end compression ratio ends up at and if it is below 11.00 to 1 I would look at running 91 or the highest octane non ethanol pump swill you can buy and try that first before running race gas on the street IHTHs Ain't motor building and racing fun Do it right once or do it over later
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 400ci Motor combination ?
[Re: ZIPPY]
#2293100
04/24/17 08:41 AM
04/24/17 08:41 AM
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Joined: Feb 2005
Posts: 4,318 Prospect, PA
BSB67
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Sounds good to me. If that is the older 308 street roller, it would be ground on 110. It should be pretty streetable as long as the rest of the car is set up for it, And if you enjoy driving it. It seems what the driver can tolerate is Really the determining factor. Exactly. Said differently, The lift and lobe profiles of that cam appear to be suitable to live well on the street. But only you can decide if you find the idle and low speed characteristics to our liking. A friend has a solid flat tappet cam with similar specs. He loves it. Very radical idle. About as bad azz as a car can sound.
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Re: 400ci Motor combination ?
[Re: BSB67]
#2293123
04/24/17 10:16 AM
04/24/17 10:16 AM
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Joined: Apr 2017
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Halfast
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Thanks for information. Anyone have any issues breaking the Crane Gold Rockers? I just put a set on but I've been told that they have been known to break easily? What's your thoughts? Should I change them?
Last edited by Halfast; 04/24/17 10:17 AM.
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Re: 400ci Motor combination ?
[Re: Halfast]
#2293246
04/24/17 02:47 PM
04/24/17 02:47 PM
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Joined: Dec 2013
Posts: 403 Romulus, MI
GTS340
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Romulus, MI
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Anyone have issues with the Crane Gold Rockers? I have been told that they are know for breaking with a .575 lift. What's your thoughts? What rockers would you recommend? Spring pressure or improper setup is what will break them, not necessarily the amount of lift
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Re: 400ci Motor combination ?
[Re: GTS340]
#2293251
04/24/17 02:57 PM
04/24/17 02:57 PM
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Joined: Apr 2017
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Halfast
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Anyone have issues with the Crane Gold Rockers? I have been told that they are know for breaking with a .575 lift. What's your thoughts? What rockers would you recommend? Spring pressure or improper setup is what will break them, not necessarily the amount of lift Agree, I'm not sure of the spring pressure at this time. But, has anyone had issues with the Crane's before?
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Re: 400ci Motor combination ?
[Re: Halfast]
#2293265
04/24/17 03:24 PM
04/24/17 03:24 PM
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Joined: Aug 2003
Posts: 43,292 Bend,OR USA
Cab_Burge
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I Win
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I have several motors with the Crane extruded 1.5 and one with 1.7 ratio aluminum rocker arms on two different motors, one street and one race only. The race only motor is a bracket race motor that has the 1.7 ratio with a Crane solid roller cam that has 250 lbs. of valve seat pressure and it has around 680 lbs. open pressure it is shifted at 7000 RPM on every run with .680+ lift at the retainers with race springs on it (edited) It has never broken a rocker arm yet That motor is old but does not have a bunch of runs on it, maybe between 300 and 500 runs total That motor was used when I got my hands on it, the pushrods where to short and those rocker arms had been abused from broken pushrod tips and around half of the adjusters had been broken off Those rocker arms had damage on the bottoms of them from the broken pushrods rubbing and pushing on them on more than three rocker arms, not sever damage but they where damaged enough to see it, I used a aluminum burr to remove the high points and a rosin roll to smooth the damages up. I have ran a bunch of different rocker arm brands and types on street and race only motors, the Cranes you have will work fine for you You can buy better rocker arms if you want them Don't sweat or worry about parts that works well
Last edited by Cab_Burge; 04/24/17 10:38 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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