New Magnum heads for 347 with Flow data
First of all I am leaving the port as it is now right @ 160cc's. My choice to use these heads was based on:
1. I could easily get these heads as they are new and inexpensive.$285.00 CDN
2. To illustrate the difference between '302's used on previous 347 and Magnums
I will ask you a question regarding port volumes-What is the port volume of an LA head? J.Rob
In comparrision to a guy going to a wrecking yard and buying a set of 360 heads for 80 dollars and maybe putting 600 into them with valve job and guides, valves/springs and seats, 600 dollars for bare casting is not a good buy.
For one of these members. That's 600 dollars plus valves, springs , retainers, rockers, springs, better valve job and porting. Sound like over a grand to start.
I didnt say anything about a 200 bill.
Port volume for a set of heads that start out from the factory 2.02 flowing almost 230cfm is 155cc's...the 1.88 flowing 214 cfm is 160 , blame it on the valves underhead shape.
In the links I posted there is a la360 head flowing stock what it took you porting to get, and then 240's ..with a smaller valve than what is used here.
If all people have are magnum heads, then good job on helping them make them work as good as the old stuff.
