6 replies to this topic

[fuzzypumper]

Hi all,

 

Does anyone  have flow rate figures for standard  VR 304 efi heads?

 

Looking for lift vs Cfm @ 28" figures for Intake and exhaust.

 

Thanks,

Archie

[Redslur]

VN heads flow 430hp at half inch lift according to my head builder guy.

[TK383]

Yeah, about that, usually a bit under 220cfm @ .500" lift.
I think about 160 on the exhaust.

Haven't flowed a stocker for years, may have to do it one day.

They'll go 240+ with just a good valve job & tidied up short turns.

[Stinga]

Yeah, about that, usually a bit under 220cfm @ .500" lift.
I think about 160 on the exhaust.

Haven't flowed a stocker for years, may have to do it one day.

They'll go 240+ with just a good valve job & tidied up short turns.

Is this with stock valves?

[fuzzypumper]

Yeah, about that, usually a bit under 220cfm @ .500" lift.
I think about 160 on the exhaust.

Haven't flowed a stocker for years, may have to do it one day.

They'll go 240+ with just a good valve job & tidied up short turns.

Thanks for the figures. Should I assume 200cfm and 160cfm where the max cfm reached before going down again

or they would have been just tested to .500" and left at that?

[TK383]

Stinga - yep.

Dammit all to hell, now I gotta flow a stock crusty vn don't I.

Maybe tomorrow.

[yel327]

Did the HBD VT 195kW heads have any port differences? It was it just the machining for the springs? The ones on the engines with the VN prefix (and SVN and SN too I guess).