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mo balls than $cents$
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looking at some new heads for my 505 m4 in the tx19. getting rid of the procomps(115cc) and goin to a 119 chamber/thick gasket otta drop my compression to near 12 to 1 , maybe a tad more, but cheaper to run no less. i'm looking for a head with good velocity on the runners and somewhere around 390cfm at .700, the rhs 360 head looks good, but the port size leaves me thinking their gonna kill me below 6krpms. the dart 345cc look pretty good too and are a option. so what i'm getting at is what head between afr/dart/rhs would be a better choice for my say 12-12.4 to 1 505? wanna make the most hp at near 6300, let the nitrous carry the motor to 7k. getting chris to grind a cam for whatever head i decide on, so they need to be outta the box ready/good flowing heads. wanna keep the head upgrade to 2k or less, it was doin good on the procomps already, but i want less compression and a better head/cam combo , so what's lost in compression over the winter, will be made up with a better combo building hp at lower rpms;) let's hear some suggestions, are the 345cc darts to big? how bout the rhs 360cc heads?
 

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so they need to be outta the box ready/good flowing heads. wanna keep the head upgrade to 2k or less, QUOTE]

Thats going to be pretty tough to do, unless you just don't care about the parts that will be in those heads, sorry but that's the reality. I would give these serious consideration
http://www.competitionproducts.com/prodinfo.asp?number=C11932CK2



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looking at some new heads for my 505 m4 in the tx19. getting rid of the procomps(115cc) and goin to a 119 chamber/thick gasket otta drop my compression to near 12 to 1 , maybe a tad more, but cheaper to run no less. i'm looking for a head with good velocity on the runners and somewhere around 390cfm at .700, the rhs 360 head looks good, but the port size leaves me thinking their gonna kill me below 6krpms. the dart 345cc look pretty good too and are a option. so what i'm getting at is what head between afr/dart/rhs would be a better choice for my say 12-12.4 to 1 505? wanna make the most hp at near 6300, let the nitrous carry the motor to 7k. getting chris to grind a cam for whatever head i decide on, so they need to be outta the box ready/good flowing heads. wanna keep the head upgrade to 2k or less, it was doin good on the procomps already, but i want less compression and a better head/cam combo , so what's lost in compression over the winter, will be made up with a better combo building hp at lower rpms;) let's hear some suggestions, are the 345cc darts to big? how bout the rhs 360cc heads?
Would you consider a set of used heads in good shape?
 

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mo balls than $cents$
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Discussion Starter #6
Would you consider a set of used heads in good shape?
absolutely, i sent him a pm bout the afr's;) do you think they'll make 800-850hp pretty easy with your cam chris(would like to keep lift under 740)? my 505 has .010 deck hieght, 48cc domes, 6.385 rod, 4.25 crank.
 

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adjones419
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1,064 Posts
I was considering a set of the RHS 360 heads but was turned away by a lot of machine shop guys telling me to stay away from them. I bought a pair of AFR 357 CNC'd heads and am very impressed! They might be a little big for your 505 naturally aspirated, though.
 

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mo balls than $cents$
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Discussion Starter #8
I was considering a set of the RHS 360 heads but was turned away by a lot of machine shop guys telling me to stay away from them. I bought a pair of AFR 357 CNC'd heads and am very impressed! They might be a little big for your 505 naturally aspirated, though.
the rhs 360 do also look alil big for me , but i've been hearing so much good stuff bout afr heads lately, would like to go in that direction.

do the afr heads have the same basic chamber design as the pro1's? when i did piston to valve, i had so much room i didn't even measure to see wtf i actually had, be neat to stay that way on a bigger roller cam.
 

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mo balls than $cents$
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Discussion Starter #9
Pro-Filer,s are on sale right now.:D
only name brand heads from here on out;):D i really think alot of guys would be surprised at how this thing ran with the procomps on it, the motor did reallllly well all summer. i did all the towing in this summer, never once needed 1 myself:)devil and i ran this biatch HARDDDD:)grn
 

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Pro-Filer,s are on sale right now.:D
only name brand heads from here on out;):D i really think alot of guys would be surprised at how this thing ran with the procomps on it, the motor did reallllly well all summer. i did all the towing in this summer, never once needed 1 myself:)devil and i ran this biatch HARDDDD:)grn
:)Unsure Pro Filers?......"only name brand from here on out?" :)eh:) not trying to be an ass hole here but did you really mean to post that response? You did qoute 71 hallett post but I am a little confused:confused:



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mo balls than $cents$
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11,734 Posts
Discussion Starter #11
:)Unsure Pro Filers?......"only name brand from here on out?" :)eh:) not trying to be an ass hole here but did you really mean to post that response? You did qoute 71 hallett post but I am a little confused:confused:
just heads that aren't weird, stock replacement type that don't need tons of work to work;)

just got a call from someone in weatherford that is interested in the boat and is talking to his ole lady, told him i'd wait till sunday to pull it apart, after that i'm getting after it.watch it sell now that i gave up trying to sell it:D
 

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mo balls than $cents$
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Discussion Starter #13

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Cantard
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steelcomp was here
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The AFR CNC 315 would be the ticket, but not on your budget. There's a CNC'd 320 Canfield that is a good head...I think all the other heads you're quoting are too big.
 

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Registered
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They were too small for my 557 a while ago:)grn I think my runners are 312 but I could be wrong, too lazy too look it up. Good luck Impatient1, keep us posted.
 
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