I have been testing a few different heads lately and have found these specs.

AFR 195 Eliminators
actual cc's in the intake port.....184
cross section area...2.13 sq.in
Flow spec's.....281/221

AFR 195 comp Eliminators
actual cc's ....189
cross section...2.15 sq.in
Flow spec's...306/235

Trick Flow 195 K D
before porting actual cc's....185
after porting ...188
cross section....2.13 sq.in
Flow spec's....270/210

Edelbrock Etec 200's
actual cc's before porting N/A
after porting....197
cross section...2.13
Flow spec's...270/218

(flow spec's @ .600 lift)

If any body can add info on this subject please chime in.....
Because I found it very interesting none of them had the cc's they claim.

 

How many CCs does the valve take up?

 

The question is...do they measure with the valve or without?

Or more direct...how do they measure?

Of course, I measured with the valve. (no other way I know of)

 

The AFR's were unported and the others ported?

 

That is correct.

 

Do you have unported data, and flow at lift?

 

What I find interesting is the AFR heads flow as advertised as we have checked.

 

do you think the guys who designed these heads put the numbers out or

some market guy looking for the biggest numbers without actually lying

of course they took the valve out

lies sell in our country

 

He posted everything we had, but we probably have some of the head flow specs. The question isnt about the flow specs of the heads, though. The question is why do head makers advertise 195cc heads that only measure 185-190cc's? My guess is they dont include the intake valve in the specs but we posted this question to find out if anyone else knows.

 

Thats strange. AFR will state 195 ccs for the base eliminators and 196 for the comp's

 

The Etec 200's had a CSA of 1.77 before porting with flow #'s of 236/193 (Edelbrock claimed 259/204 @ .600)

The SDPC intake was 1.76 before porting and 1.87 after. The unported flow was 227-236....... after porting N/A

I am hoping to get it to 2.3 or 2.5 after it's done (in progress).
And flow #'s of 310-320

 

Update on my E-tec heads......

Two of the chambers were bigger than the rest (on the end cyl.s) & one head was bigger than the other by a few cc's.

I went to Manley Performance and found an intake valve & exhaust valve with more margin and less dish but retaining the same shape on the backside.
I only gained a few grams of weight on each.
That brought the cc's up to match the others, then I milled them to 60cc's.
That got the compression up to 1.6, that was easier than replacing the pistons.

They now flow 270 cfm @ .600 on the intake &
218 @.600 on the exhaust (without a pipe).

All I can say is....shame on Edelbrock.

 

you guys are the brains and i sure enjoy watching the masters - but couldn't you use clay to plug up the holes? it it was wet then all you would have to do it hit it with a hair dryer and it will shrink as it drys and fall out. or you can just wash it out.

just a suggestion from someone who does not really know what i am talking about and admits it.

 

nice of you to start, but you didn't even specify the lifts for the flow given, let alone a proper curve, including low-lift, and not heads that we can't duplicate.

 

Start what?
This post wasn't about flow.

Lateset results....the heads definately work now.

New dyno #'s 370 RWHP & 410 RWTQ