Re: Pump gas 410 SB Mopar using RHS heads!
[Re: Brian Hafliger]
#604824
02/08/10 03:25 PM
02/08/10 03:25 PM
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Joined: Dec 2006
Posts: 454 PNW
Beebuzzn
mopar
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mopar
Joined: Dec 2006
Posts: 454
PNW
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Quote:
Heads flow 268@ .500 and [Email]272@.550[/Email] and then they go turbulent. Flow curve is great from bottom to top. These are unported, just blended the valve job into the bowl. This is how we sell these heads.
We tried rpm airgap, and super victor. The latter was down on TQ and HP up till 5000rpm...it was down ALOT!! We tried my 1 7/8 TTI's against TTI's smaller header and the small header beat it everywhere.
Also tried some 1 3/4 Hookers and they were almost as good as the small TTI's but not quite.
Yes they still hang in the port some, but didn't seem to hurt anything!!
Just curious if you ran stock 340 hp exhaust manifolds how much HP and TQ would you lose ? Thanks
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Re: Pump gas 410 SB Mopar using RHS heads!
[Re: Crizila]
#604834
02/12/10 10:24 AM
02/12/10 10:24 AM
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Joined: Sep 2004
Posts: 2,091 oberlin, Ohio
Rapid340
top fuel
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top fuel
Joined: Sep 2004
Posts: 2,091
oberlin, Ohio
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Any chance of a few 1/4 mile passes?
Thanks for sharing the details and results.
1971 Factory Appearing Duster 340 11.000 @ 122 mph
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Re: Pump gas 410 SB Mopar using RHS heads!
[Re: HardcoreB]
#604838
02/12/10 11:23 AM
02/12/10 11:23 AM
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Joined: Jan 2003
Posts: 5,484 SoCal
Brian Hafliger
OP
master
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OP
master
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Posts: 5,484
SoCal
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Quote:
This thread is useless without track times. LOL...It would be nice if you have the oppurtunity though.
If Rob will let me race the car with his converter I might...MIGHT take it to Barona...we'll see. It's 1/8. My gearing is too steep for 1/4 and this engine. And I'm not changing that (dana)!!
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Re: Pump gas 410 SB Mopar using RHS heads!
[Re: Brian Hafliger]
#604839
02/12/10 12:29 PM
02/12/10 12:29 PM
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Joined: Apr 2005
Posts: 12,271 Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
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Quote:
Quote:
This thread is useless without track times. LOL...It would be nice if you have the oppurtunity though.
If Rob will let me race the car with his converter I might...MIGHT take it to Barona...we'll see. It's 1/8. My gearing is too steep for 1/4 and this engine. And I'm not changing that (dana)!!
It's good with me. It's not balloon plated or set up for a transbrake. No transbrake launches, and I'm cool with it.
Go beat on it a bit!
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Re: Pump gas 410 SB Mopar using RHS heads!
[Re: Crizila]
#604840
02/13/10 10:56 AM
02/13/10 10:56 AM
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Joined: Jan 2003
Posts: 9,875 Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
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Great combo, Brian!! That very close to the 500hp stroker small block recipie I use for Mopar and Ford Small blocks for combos that want a strong 'big block' feeling torque curve in their cars that don't neccesarily care so much about winding them up too tight. One Key with hydraulic flat tappets is getting around 250 cfm at .400, since most hydraulics peak under .550 lift going .050 down from there I'm looking to get 265-280 at .500, this kind of flow gives you a big fat torque curve right in the middle of the powerband with a very streetable cam profile. Mopars want about 8-10 degrees more at .050 (typically 242-246 on the intake) for the same type of curve and Fords tend to like a single plane like the Vic Jr over the RPM type big dual plane. On your combo looking a the torque curves you can see the SVic is way overkill, it's lazy lazy until you get the piston speed WAY UP...I'd be real interested to se what the M1 (which is essentially a slightly updated strip dominator) would do...those runners go about 285 which might be perfect and worth enough up top over the RPM above 4000 (the equal-point cross-over is right around 4800 at 340 inches) or so to make a nice trade. One thing I try to express is the with a 4" arm you're letting the piston speed do the work, you don't neccesarily want or need to wind them up so high, and truth be known a 370-ish smallblock motor can make the same HP as a 400+ incher with about 500 more RPM....actually the 370 is more efficient in terms of HP production because once you get over the torque peak the rings are acting like a brake (in terms of frictional hp loss per each 100 rpm of RPM gain). Strokers make there best moves in the big fat middle, that's the main reason automatic cars (with typically wider gear spreads) ET better with Strokers, they win in the Torque per Cube category, not so much the RPM dependant HP/cube dept. did you chart the head flow? I'm wanting to a set of those X's. I think the next potential big leap with the Magnum style stud rocker head would be to rotate the intake valve up and the exhaust down (while staying on the bore center) combined with a compact figure 8 combustion chamber and a 2.08" intake valve, very similar to the TFS twisted wedge. This could get rid of the pushrod pinch and shorten both runner lengths.....I think such a design could flow 280 at .450 and ~305-310 @ .500 without too much difficulty....and that equates to easy 600hp potential. With the right offset on the intake and a 1.73 (BBC/cleveland ford ratio) rocker ratio the sky is the limit....I think it could be made affordable too.
Last edited by Streetwize; 02/13/10 01:17 PM.
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Re: Pump gas 410 SB Mopar using RHS heads!
[Re: Streetwize]
#604841
02/14/10 01:12 AM
02/14/10 01:12 AM
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Joined: Jan 2003
Posts: 5,484 SoCal
Brian Hafliger
OP
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OP
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Joined: Jan 2003
Posts: 5,484
SoCal
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Head flow: Some guys were asking me what the RHS heads we sell flow so here are the #'s.... Lift Int. Ex. 100 69 58 200 141 119 300 197 161 400 241 184 500 267 193 550 271 195 600 int. port goes turbulent
What that means is even though it goes turbulent, with an intake on it pulled to .600 lift so lifting the valve to .600 will still net you more HP.
This test used a 4.030 bore and test pressure of 28". Ex. side I used a 1 3/4 pipe and as you can see, it's damn good OOTB!
Brian Hafliger
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Re: Pump gas 410 SB Mopar using RHS heads!
[Re: reflections7]
#604843
05/15/10 07:25 PM
05/15/10 07:25 PM
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Joined: Jan 2003
Posts: 5,484 SoCal
Brian Hafliger
OP
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OP
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Joined: Jan 2003
Posts: 5,484
SoCal
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Welcome! I just got the engine out and will be putting back on the dyno for a few more tests. Then we're pulling the cam and top end off for a "part 2" to the story. I should add that we'll be porting a set of eddy heads, roller cam and after some carb testing we'll be going with EFI; plus we plan to try F&B's 3-2BBL injection setup! Should be alot of fun!!
Last edited by ou812/IMM; 05/16/10 11:14 AM.
Brian Hafliger
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