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Author Topic: Looking for a HP increase for my 440 advice please ( heads cam)  (Read 1349 times)

Offline angelo78

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Re: Looking for a HP increase for my 440 advice please ( heads cam)
« Reply #15 on: October 20, 2016 - 07:06:51 am »
Haha that would suck.   I borrowed some porting burrs today and had a little play.  Things went pretty well.  I will take the heads to a machine shop and get them throated for a 2.14 intake and 1.81 exhaust valves.  Should i go a 75 degree cut into the bowl and blend from there?  I have a have ported other heads before and they made good power but never mopar heads.  I might postva few pics along the way for some advice.

Cheers




Offline Chryco Psycho

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Re: Looking for a HP increase for my 440 advice please ( heads cam)
« Reply #16 on: October 20, 2016 - 09:14:10 am »
Air will move faster on the long side of a wing so make a rounded front & a knife edge away from the flow using the long side to direct air past the valve at a 70* angle towards the plug , same will work in the exhaust port cut around the guide creating a wing shape with the exhasut port pointed up use the 7 oclock position as the high point & bring the air around the valve guide , raise the roof 3/16 or so , widen the port so the straight side is flat , this is the common wall in the center ports & the end walls on the outer ports  & you can gain 20%+ flow , leave the floor alone . in the intake port & square the port so it is full width from center to the top  but leave the pushrod wall there as it creates a venturi & speeds air flow behind the valve , I use a 3/8" round nose cutter with square sides to thin around the guide , you can gain 14% on the intake side . Blend behind the seat you can throat cut to 75* & blend to that , I install hard seats on the exhaust side for the unleaded fuel so you will have a 90* behind the 45*seat .
 I hope this helps . there was pictures on this site somewhere that I posted years back  you may  be able t find them
« Last Edit: October 20, 2016 - 09:18:08 am by Chryco Psycho »

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Offline angelo78

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Re: Looking for a HP increase for my 440 advice please ( heads cam)
« Reply #17 on: October 21, 2016 - 05:37:41 am »
Thanks a lot for the tips and advice.  I need to buy some valves and get then to the machinist so he can throat the heads.  Cheers


Offline Chryco Psycho

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Re: Looking for a HP increase for my 440 advice please ( heads cam)
« Reply #18 on: October 22, 2016 - 12:04:36 am »
 :2thumbs:

Challenger - You`ll wish You Hadn`t

Offline angelo78

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Re: Looking for a HP increase for my 440 advice please ( heads cam)
« Reply #19 on: November 23, 2016 - 06:51:13 pm »
Hi guys,  bit of an update.   I ordered a lunati 702 and all the appropriate valve gear last night.  I have also finished the 516 heads .  I have throated them for 2.14 and 1.81 valves.  I got .010 shaved off the head and they now cc at 80cc on the dot. I am pretty happy with my home porting job as I didn't hit water lol.  Overall I am happy so far and can't wait to get them in the car.  I have attached a couple of pics of the heads.


Thanks a lot for all the advice and tips along the way