RHS MA-X 20300 REAL flow numbers
#1101340
10/25/11 11:37 AM
10/25/11 11:37 AM
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Joined: Dec 2008
Posts: 37 Pittsburgh Pa
b5fish73
OP
member
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OP
member
Joined: Dec 2008
Posts: 37
Pittsburgh Pa
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I decided to go with RHS magnum heads for my 408 build based upon flow numbers Ive been reading about. I know I'm probably going to get a lot of flack about the bench I had them done on being conservative, but take of it what you may. RHS 20300 cut for 2.02 intake with stock exhaust valves, ported and by Toth Performance in Eau Claire PA. I think these numbers are more realistic of what the heads actually are. These are very nice heads, I've just been reading too much about them being more than what they really are. As Cast 1.92int -- Ported 2.02int ---- Int----Exh----Int----Exh .100 67.4 - 62.2 - - 72.6 - 64.7 .200 115.1 - 111.6 - 133.6 - 113.1 .300 163.0 - 151.2 - 188.6 - 156.2 .400 190.2 -172.5 - 230.0 - 188.1 .500 205.2 - 178.4 - 248.1 - 190.2 .600 212.0 - 178.9 - 257.5 - 193.0 .700 ------ ------ - 261.1- -----
Last edited by B5Fish73; 10/25/11 12:01 PM.
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Re: RHS MA-X 20300 REAL flow numbers
[Re: b5fish73]
#1101345
10/25/11 12:31 PM
10/25/11 12:31 PM
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Joined: Jan 2003
Posts: 5,484 SoCal
Brian Hafliger
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master
Joined: Jan 2003
Posts: 5,484
SoCal
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On my bench an OOTB RHS head with a stock 1.92 valve goes 244-246 cfm from .500 to .600 lift. That's it. Once we do the 2.02 valve and blend they will flow on my bench, mid to high 260's @ .500 and high 260's to low 270's @ .550 lift.
My basic porting get them in the 280's @ .500 and 290's @ .600 lift. Brian
Brian Hafliger
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Re: RHS MA-X 20300 REAL flow numbers
[Re: Brian Hafliger]
#1101346
10/25/11 07:32 PM
10/25/11 07:32 PM
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Joined: Feb 2005
Posts: 5,221 Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
On my bench an OOTB RHS head with a stock 1.92 valve goes 244-246 cfm from .500 to .600 lift. That's it.
I agree, & the way my mild 360 magnum performed i was very pleased with them OOTB.
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Re: RHS MA-X 20300 REAL flow numbers
[Re: Brian Hafliger]
#1101349
10/28/11 08:13 PM
10/28/11 08:13 PM
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Joined: Nov 2004
Posts: 3,544 Syracuse,NY
CompWedgeEngines
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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As Brian says, if your getting 205 on those heads, you have a serious problem. Is this a " known" flow bench?
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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