need help picking intake runner size on 327 heads... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**CMars45000** · 09-26-2006, 02:37 PM

I am building a hot rod 327 for my 71 swb and I am having a tough time deciding between 180cc or 200cc intake runners on the Brodix IK-series heads...

I will be running a solid roller comp XR286R cam...the cam has has an RPM range of about 3000 to 7000 rpm...based on your experience, what runner would be best suited to this engine... oh, 11.2:1 compression with 2.02/1.60 valves...

thanks

jamon8 · 09-26-2006, 04:33 PM

has everything to do with how much air you need

with a 327 unless its blown you should be more than ok with the 180's

Myself · 09-26-2006, 05:25 PM

I'm not sure what type of intake and carb tour running, I will assume high rise single plane or tunnel ram. I'd say with heavy breathing in that RPM range go with the 200's.

57sailplane · 09-26-2006, 05:51 PM

i ran your 327 on my calculator..

asuming your runing 100% volumetric efficiency you will pull about 215 cfm at 28 lbs..

asuming your runing 120% vol. eff.. you will pull about 245 cfm at 28 lbs..

according to brodix and there flow charts the 180s flow 245 at .600 lift and that should cover your 327 nicely.. if you go to the larger heads you will probably be disapointed cause it is hard enough to get 110% vol. eff.

the 180s are perfect for your engine..

just my 2 cents

jamon8 · 09-26-2006, 08:43 PM

you make a good point

bigger is not always better

brodix heads are BAD Ash enjoy

09-26-2006, 02:37 PM	#1
CMars45000 Registered User Join Date: Jul 2006 Location: Pittsburgh, PA Posts: 204	need help picking intake runner size on 327 heads... I am building a hot rod 327 for my 71 swb and I am having a tough time deciding between 180cc or 200cc intake runners on the Brodix IK-series heads... I will be running a solid roller comp XR286R cam...the cam has has an RPM range of about 3000 to 7000 rpm...based on your experience, what runner would be best suited to this engine... oh, 11.2:1 compression with 2.02/1.60 valves... thanks __________________ Project Family Values Build Thread Vehicles/Projects: -1971 C10 SWB Fleetside! Gathering parts now, will begin frame-off resto soon... Pleasure in the job puts perfection in the work. -Aristotle

09-26-2006, 04:33 PM	#2
jamon8 Registered User Join Date: Apr 2006 Location: southern Il Posts: 335	Re: need help picking intake runner size on 327 heads... has everything to do with how much air you need with a 327 unless its blown you should be more than ok with the 180's

09-26-2006, 05:25 PM	#3
Myself Registered User Join Date: Oct 2005 Location: Northern Arkansas Posts: 1,136	Re: need help picking intake runner size on 327 heads... I'm not sure what type of intake and carb tour running, I will assume high rise single plane or tunnel ram. I'd say with heavy breathing in that RPM range go with the 200's.

09-26-2006, 05:51 PM	#4
57sailplane Senior Member Join Date: Mar 2004 Location: Nebraska Posts: 583	Re: need help picking intake runner size on 327 heads... i ran your 327 on my calculator.. asuming your runing 100% volumetric efficiency you will pull about 215 cfm at 28 lbs.. asuming your runing 120% vol. eff.. you will pull about 245 cfm at 28 lbs.. according to brodix and there flow charts the 180s flow 245 at .600 lift and that should cover your 327 nicely.. if you go to the larger heads you will probably be disapointed cause it is hard enough to get 110% vol. eff. the 180s are perfect for your engine.. just my 2 cents

09-26-2006, 08:43 PM	#5
jamon8 Registered User Join Date: Apr 2006 Location: southern Il Posts: 335	Re: need help picking intake runner size on 327 heads... you make a good point bigger is not always better brodix heads are BAD Ash enjoy



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