Re: 18 Poly head flow
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Re: 18 Poly head flow



Thanks for the chart,  try a 30 degree seat with a 15 degree top cut  knock the sharp edge off  where it meets the chamber. looks like they start to stall out at 400 so this seat will pick up quite a bit.   Have you ever used an offset dowel say 050 to move the valve that much farther from the cylinder to unshroud it.  It should help the flow cone around the valve.  Ar e you polishing the port or leaving it rough?  Leaving it rough is 15 hp.  What are the valve angles?  Seems like these heads might like a lot of duration and need only 500 lift.  Now this is my experience, if 230, and on these small engines it should be, wasn't enough I go to 260 and advance the cam 5 degrees. Any 240 250 duration cam never seemed to really work all around. Overlap becomes an issue but you can spread the lobe separation.  I figure out how much overlap I need then figure out duration I need from there. Closing the intake at 43 (.050) seems to work well This is all my opinion but Ive had pretty good luck so far. Something to think about anyway.


On Friday, January 9, 2015 5:59 PM, "tothperformance@xxxxxxxxxxxxxxxx" <tothperformance@xxxxxxxxxxxxxxxx> wrote:



Here are the flow numbers for the Poly head.
 
Lift                                    CFM Intake                                        CFM Exhaust
.100                                        108.8                                                     79.9
.200                                        179.3                                                   117.8
.300                                        218.7                                                   136.7
.400                                        236.1                                                   160.2
.500                                        244.3                                                   170.2
.600                                        254.1                                                   172.6
 
Keep in mind we offer new camshafts in various profiles to fit your application. New stainless race grade valves in 1.94 and 2.02 intake and 1.60 exhaust sizes. Stroker kits to make the 318 into 392 cubic inches available in cast steel and forged crank versions.
 
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Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email address. This practice will protect your privacy, reduce the total volume of mail and fine-tune the content signal to Mopar topic. Thanks!
 
1962 to 1965 Mopar Clubhouse Discussion Guidelines:
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