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Author Topic: Another RHS215 vs AFR 205 thread  (Read 17210 times)
dads67coupe
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« on: September 10, 2016, 03:02:46 pm »

Looking at buying some decent heads for my 408w build. Its will be a street car, with maybe a pass or two a year on the strip.

It will be a pump gas car

It will be a hydro roller cam, mild lumpy idle, but streetable

its a 67 mustang coupe with an auto and 3.27 gears (may change gears in future, but only to 3.55 or 3.73 as I do not have an overdrive)

Trans is a TCI c4

Is the difference in price worth if for the bit of extra power with the AFR heads on a street car

how much HP and I leaving in the table with the RHS heads.

Anything else I should know
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juiced coupe
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« Reply #1 on: September 10, 2016, 04:07:50 pm »

I believe that newer AFR heads use lighter 8mm valves and LS style spring packages. Last I heard, the RHS heads didn't have either.
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
dads67coupe
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« Reply #2 on: September 10, 2016, 05:15:19 pm »

will that make a huge difference in a street car (honest question)

I will end up getting springs that match the cam with either head I assume, unless the AFR springs or the RHS Springs come tailored to the build? Another honest question, I have never bought a set of new heads. Had some swap meet and craigslist heads in the past, but never bought new

This is my first "big" build. I have built a few stock or nearly stock upgraded motors before, but this is the first good one
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juiced coupe
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« Reply #3 on: September 10, 2016, 05:46:51 pm »

With a hydraulic roller, it could potentially make a huge difference in the upper rpm range. It can also open up the possibility of using a more aggressive cam if a custom is in the future.
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
dads67coupe
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« Reply #4 on: September 10, 2016, 06:01:01 pm »

ok, good to know. Only planning on hitting 6000-6500 max and not very often. I have a $2500 budget for my crank and my heads. Looking at RPM crank thats around 600, and that leaves around 2k for heads.

Anything I can save on heads will go towards balancing the rotoating assy. If I use the full budget, balancing will have to wait til I save up again. Trying to do it right, even if it takes longer.

Shooting for 500hp or so on 91 octane if possible, but not stuck on a number. Drivability has priority to some degree
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al2
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« Reply #5 on: September 10, 2016, 06:22:10 pm »

If you haven't got Pistons yet I would do trick flow TW.
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dads67coupe
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« Reply #6 on: September 10, 2016, 06:27:02 pm »

Already have a block, pistons and rods. collecting things as sales a deals come up.

Rods are eagle H beam with arp hardware 6.25 length, and lunati icon pistons to match the rods, puts compression ratio around 10. to one depending on head combustion chamber, could be as high as 10.4 or .5 I think with 58cc heads if I remember correctly, mught be off some. Pistons are at my shop, not here
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woody
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« Reply #7 on: September 10, 2016, 06:51:28 pm »

The valvetrain in rhs heads and just about any as casted head are garbage compared to the 11r wedge heads and afr heads. They have to cheap out somewhere on the heads to price them low enough so people will buy them. I wouldnt bother buying rhs heads and then changing spring when you get an 8mm valve and pac 8019 valve spring standard on the afr.
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dads67coupe
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« Reply #8 on: September 10, 2016, 06:56:44 pm »

if the out of the box afr springs will work with a decent cam, then thats probably cheaper in the long run
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woody
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« Reply #9 on: September 10, 2016, 09:34:33 pm »

You MUST specify the 8019 spring be installed. An afr 205 sold by 99.999% of places online the 205 comes with a solid roller spring. The pac 8019 spring is 104-150 on the seat, 440 open, lightweight and is light years better than anything before and anything currently installed on out of the box heads other than the 11r line of heads, these also come with killer pac spring.

The rhs comes with a generic 1.430 diameter spring, which need to be changed. A good 1.280 pac spring setup will run 300.00 bucks so figure that in.

These as casted heads dont make much sense for 95% of the hobbyist out there. TFS and AFR have run away with the market based on performance and the valvetrain they are equipping them with.
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331-347 Short Blocks 2099.00 and up
408-418-427 Short Blocks (F4 Roller Blocks Standard) 2399.99 and up
Dart Shorts 4199.00+
D.I.Y Shortblocks 1799.00

FordStrokers.com

Make sure you get your information from the internet gurus that haven't built SHIT, they did sleep at Holiday Inn last night, and we have a few of those gurus right here on this forum. Smiley
dads67coupe
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« Reply #10 on: September 11, 2016, 09:18:29 am »

woody, who do you recommend to buy them from? n(unless you sell them, in that case PM me
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dads67coupe
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« Reply #11 on: September 11, 2016, 10:34:21 am »

I see you sell AFR stuff, I used the contact for asking about a crank as well.... Looks like you will be getting all my money lol
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dads67coupe
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« Reply #12 on: September 11, 2016, 10:43:34 am »

Also is it worth the extra to internal balance on a street car?

or is it easier to balance the assembly external?

Looking for recomendations!
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Outlaw Bill
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« Reply #13 on: September 11, 2016, 11:09:18 am »

Also is it worth the extra to internal balance on a street car?

or is it easier to balance the assembly external?

Looking for recomendations!
Its always better unless it requires big money to do so.
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dads67coupe
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« Reply #14 on: September 11, 2016, 11:39:25 am »

which way is cheaper and easier to balance?
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