87 CFM at .100 is a pretty happy number so I would say his bench reads high.78vette wrote:I thought that was really high also. I am not an expert on this stuff by any means. If the exhaust wasn't so low I would not have believed the intake. They were tested at 28" with a 4.060 bore fixture. I opened up the push rod pinch to about 1.96, I did not check the port volume- I did not take a lot out of the ports, just cleaned them up with a carbide and then cartridge rolls and made everything nice and straight. The throat was 90% on the intake- because of the way the seat and bowl was in the exhaust I only opened them up to about 87%. I should have went with 1.6 on the exhaust and opened them up more because they did not flow as well.ap72 wrote:286cfm with a 1.94" valve?! That's incredible! Can you share some details? What depression were they tested at? Volume, min csa? Valve/seat angles/widths? Throat diameter?78vette wrote:You may want to look at Enginequest Vortec heads also. I just bought a set and ported them myself, (first time porting- followed info here and by Joe Mondello)
they flow 259 @ .400, 277 @.500. 286 @.600 on the intake with 1.94 valves. They are very nice castings and they have several combinations of intake faces and center bolt or perimeter bolt valve cover. I did not flow them before porting but they are supposed to flow as much or more than a stock vortec.
Randy
I don't know the valve angles, a local guy with a good reputation (Kim Barr) did the valve job and the flow- I know it is a 5 angle. If you are really interested I could find out.
Here are the complete numbers.
Lift I/E
.100 87/70
.200 160/ 117
.300 217/ 143
.400 259/ 165
.500 277/ 171
.600 286/ 174
Randy
RHS 170cc vortec airflow
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Re: RHS 170cc vortec airflow
Re: RHS 170cc vortec airflow
Can somebody please post up contact information for Enginequest heads.
Thanks in advance.
pdq67
Thanks in advance.
pdq67
Re: RHS 170cc vortec airflow
http://www.competitionproducts.com/Engi ... ucts/2189/pdq67 wrote:Can somebody please post up contact information for Enginequest heads.
Thanks in advance.
pdq67
http://www.onedirt.com/tech-stories/eng ... evy-heads/
http://www.hotrod.com/articles/0611em-v ... all-block/
http://www.aamidwest.com/contact/
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THE ABOVE POST IN NO WAY REFLECTS THE VIEWS OF SPEED TALK OR IT'S MEMBERS AND SHOULD BE VIEWED AS ENTERTAINMENT ONLY...Thanks, The Management!
THE ABOVE POST IN NO WAY REFLECTS THE VIEWS OF SPEED TALK OR IT'S MEMBERS AND SHOULD BE VIEWED AS ENTERTAINMENT ONLY...Thanks, The Management!