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Interesting Ported Iron Head CFM Comparison Info

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Interesting Ported Iron Head CFM Comparison Info

Old 01-14-2019, 10:27 AM
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Interesting Ported Iron Head CFM Comparison Info

I

found this info on a Fiero site recently.

Stock FE heads are the 85-95 fuel injection heads
Falconer are the mythical Ryan Falconer heads that supposedly made 300 horsepower back in the 80s in the midget cup racing series. The intake port divider "hump" was removed from them
I'm unfamiliar with the BHP heads, but I know they are CNC ported and leave the intake port divider hump intact, if shaved some
The La Fiera heads are also CNC ported, but the intake port dividers were deleted. I also know these heads have 1.8" intake and 1.5" exhaust valves

On the intake side, It's interesting to look across the board and see that the Falconer heads lose little flow at low lift to the stock heads even though the intake port divider was deleted. It's also interesting that the La Fiera Heads & BHP heads killed the falconer heads at .500 lift.

I just thought i'd share.
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Old 01-15-2019, 10:42 PM
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Re: Interesting Ported Iron Head CFM Comparison Info

Cool! But the sad part is that the LaFierra heads flow about the same as a small port gen III head.

don't worry about the .500 # unless your cam has .550+ valve lift.
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Old 01-16-2019, 08:08 AM
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Re: Interesting Ported Iron Head CFM Comparison Info

My specific lift is .469 inches with my comp 260h cam and 1.6 roller tip rockers.
Looking at aluminum heads isn't depressing to me, looking at LS swap cars is LOL.
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Old 01-16-2019, 09:52 AM
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Re: Interesting Ported Iron Head CFM Comparison Info

The sooner you swap to aluminum heads the better! Lol iirc my ported 3400 heads maxed out around 238 cfm @ .600 lift on the intake side. I might do a video soon on budget 3400 heads, basically what gains you can get out of them for little cost at home!
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Old 01-16-2019, 10:05 AM
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Re: Interesting Ported Iron Head CFM Comparison Info

too high compression without swapping pistons with a turbo, and I have a brand new short block so i'm not fooling with that. but to anyone else not in my situation I say absolutely go for alum heads.

Last edited by Sierra6; 01-16-2019 at 10:20 AM.
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Old 01-16-2019, 10:17 AM
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Re: Interesting Ported Iron Head CFM Comparison Info

not to mention how many hours I spent porting and polishing my intake. AND how much I spent on my ported iron heads with new stainless valves. I won't set any records but i'll be happy just to get it running and I like the way it'll look.
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