RHS flow #'s

-
Hi, i think with the proper head gasket there will be no interference problem - the pro´s here will tell you which to use best!

regards Michael
 
How much variation are you seeing in flow and port volume from port to port on these heads? How about variation in chamber volume from chamber to chamber?
 
cudaman51 said:
would it be possible to use the rhs heads on a 340 that has the pistons .017 out of the block
Click to expand...

Yes I just did it.........Use Felpro 519SD head gaskets that have a compressed thickness of .054 and you will have .037 quench!!! Rock Auto sells the gaskets for about $60.00. You will need to cut away the pushrod holes part of the gasket because they are MAGNUM based and the push rods will hit the gasket but they work fine.

PM me if you want me to explain in detail exactly what I did. I can send you pictures.
 
JoeDust451 said:
I wouldn't be too hard on the guys at Hughes engines, they treated me very good when i purchased mine, gave me some history on them, Kevin even explained about why not to get caught up in the max flow #s, mid lift #s are more important, the heads looked really nice when i got them, you really can't exspect the world for 875.00 bucks.
Click to expand...

I posted about Hughes just to point out that you could have a 66cc head on the passenger side and a 67cc head on the drivers side. I dont expect the world but when you advertise at 62cc then they darn well should be close. They are off by a MILE!!! I still love the heads regardless but they need to be set up properly is all in my book. I have good and bad experience with them just to let you know.
 
ou812 said:
Peak was 5400rpm! TQ at 3000 was almost 450! 750 holley DP and rpm air gap...unported.
TTI 1 5/8-1 3/4 headers were best over straight 1 3/4 and 1 7/8.
Liked thicker oil too as it's hyd.
Click to expand...

WOW!!! That is VERY good!! That thing is a torque monster!
 
Mad Dart said:
WOW!!! That is VERY good!! That thing is a torque monster!
Click to expand...

sounds like mine, but with a hyd cam.

I'd assume with a single plane and 830-850 carb it'd pick up 18-25 hp/torque

The small tubes'll help exaggerate 'some' of the bottom end torque while the big tubes probably ate away at it some with a shift of hp not worth the greater loss down low, I'm guessing.
 
1967DartGT said:
How much variation are you seeing in flow and port volume from port to port on these heads? How about variation in chamber volume from chamber to chamber?
Click to expand...

We did a compression test and had 5 cylinders at 175lbs., 2 at 180lbs. and 1 at 185lbs. so not bad for untouched chambers.
I've seen +/- 2cc so far.
Ports seem to flow within 1% of each other but I don't test each port unless I'm paid to which is almost never! I do use templates alot when I port to help keep things equal, but these heads only got the valve job blended.
Brian
 
Ever flow a set with 2.055's with the same blending you do for the 2.02's??
 
No I haven't. The pushrod pinch is so small it's only going to let so much air volume through. And the larger valve will remove most of the venturi in the bowl and make the short turn even worse requiring alot of porting to fix.
 
Yup! Ya convinced me! I have looked around and I can see that your price is good. Everything you said is right on.
I might be talkin' to ya for heads on my turbo 318 build.8)
 
yeah, sounds like a lot more bowl work would need to be done with that 2.05
in order to get the shape back.

Are these push rod pinches open sided like the magnums?
 
wow really?

that, too me, seemed like the most counter productive thing mopar could have done.
I mean...why not make them oval for the roller's push rod clearance, like as in opened up more toward the intake face/exhaust face instead of side to side and into the port window?
 
ou812 said:
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!
Click to expand...

These are the flow #'s for your 1295.00 out of the box ready to bolt on?

Tell me, up to what rpm range are the valve springs you provide good for?

Still window shopping for heads. Thank you.
 
Yes those are the flow #'s on these heads the way we sell them.
It all depends on the cam as to how much rpm the springs will take. I know they will take .600 lift, and will go at least 6500rpm cause I've done it on 2 engines now.
I'd say they're good for 6800rpm with no float.
Brian
 
Can someone post a picture, or link to a picture, of the combustion chamber side of these heads? I have looked everywhere I can think of, and have yet to find a picture of this side.

thanks!
 
With valves:
5785669carcraft408309.jpg
 
You must log in or register to reply here.
-

Back
Top