Mpcoluv
Gearhead Posts: 1278
From: Charlotte NC usa
Registered: Apr 2001
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posted 08-11-2002 09:59 AM
   
Just thought I'd post the latest flow bench findings for 351C 4V heads with the port stuffers. The Terry Parker stuffer flowed 7 CFM more @ .600 (261 vs. 254) than the Roush stuffer even though the parker stuffer reduces the cross sectional area more. We then flowed the head with the intake. The flow dropped 2! cfm with the intake attached. This is exceptionally good. BTW the port in the intake is narrow than the stuffed 4V port. Makes the high flow even more exceptional.
My previous post listed the flow data for the "open" vs stuffed heads. You lose some flow over .450 with either stuffer but velocity is way up. All test were done on a 4V open chamber head with unknown valve job and no port work. I'm sure you could get close to 300 CFM with a little grinding.
BTW, the bone stock 4V heads flow way more than ported aussies. The stuffed otherwise stock heads flow about 10cfm more than the ported Aussies with great velocity.
BTW a rule of thumb is to multiply the cfm @ .600 by 2 to get the hp potential of a set of head on a motor at least 10:1. So the bone stock 4V heads with the stuffers could support 500hp providing you have enough cam, compression etc....
Looks like I should have more Ft/lbs with the higher velocity.
When I pull my ported heads, I'll post flow figures for those too with and without stuffers.
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