Ok I have to start off by saying I am new at the cylinder head porting thing so please be gentle with me…
I have a set of iron 23 degree pro action 200cc runner heads that are going on a 406 12.18:1, the cam is 262/268 @.050 .645 lift 106 LSA
This is what the heads are now @28
.100=68.5
.200=134.32
.300=191.63
.400=235.96
.500=260.98
.600=268.51
.700=278.41
The push rod pinch is 2.52 csa. The average sq in area of the port is 2.23122 and they have a 2.02 valve with a throat of 1.850”
Are these good numbers bad numbers???? What do I need to fix and where should I start???
Like i stated in the begining i am new at this so i am open to some direction.
thanks for any help, Keith
pro-action 200 cc heads
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pro-action 200 cc heads
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flow numbers
Those numbers posted above look closer to a set of those heads I did a little work to a while ago. I just got a set of those heads with CNC chambers and they flow like crap. 256@ .600 and 258@.700. The heads I got before with as cast chambers flowed high 270's at .700 stock.
heads
Dennis,
That throat dia is about .100 below the 45 deg seat. The numbers came off of Ruhls bench. I bought these heads some time ago and he did one cylinder for me and told me that he got them to be real close to what was advertised. So i just used the numbers form the book....I have no idea what bore he used to flow them. I am not real sure on how or where to check the ssr.....
Maybe i should run them up and let you check them???
Keith
That throat dia is about .100 below the 45 deg seat. The numbers came off of Ruhls bench. I bought these heads some time ago and he did one cylinder for me and told me that he got them to be real close to what was advertised. So i just used the numbers form the book....I have no idea what bore he used to flow them. I am not real sure on how or where to check the ssr.....
Maybe i should run them up and let you check them???
Keith
“If I hit you with this you’re going to be numb, that’s why they call them numb-chucks “Si Robertson