Stock AFR 225 72cc vs CNC ported 317s
#21
9 Second Club
iTrader: (12)
Reasons to go with aftermarket heads:
1. make similar power with less boost
2. maximize power with more boost
3. better choice for pumpgas build
4. thicker deck
Reason not to go with aftermarket heads:
1. Purchase price
I picked up a very nice set of used AFR 225s for $1,700. How much do the ported 317s cost - $1,200?
1. make similar power with less boost
2. maximize power with more boost
3. better choice for pumpgas build
4. thicker deck
Reason not to go with aftermarket heads:
1. Purchase price
I picked up a very nice set of used AFR 225s for $1,700. How much do the ported 317s cost - $1,200?
#22
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Reasons to go with aftermarket heads:
1. make similar power with less boost
2. maximize power with more boost
3. better choice for pumpgas build
4. thicker deck
Reason not to go with aftermarket heads:
1. Purchase price
I picked up a very nice set of used AFR 225s for $1,700. How much do the ported 317s cost - $1,200?
1. make similar power with less boost
2. maximize power with more boost
3. better choice for pumpgas build
4. thicker deck
Reason not to go with aftermarket heads:
1. Purchase price
I picked up a very nice set of used AFR 225s for $1,700. How much do the ported 317s cost - $1,200?
#23
317's can make some decent power, I've pushed mine as far as they can go, 24.5psi, time for thicker decks and better flow, but the 317's have been a great "budget" head thus far...
#26
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I was reading a thread on here in regards to a guy using what he called "pyramid rings" in addition to his 317's. From what I gathered you can run however much boost you want because with the rings you don't have to worry about blowing gaskets and such with too much boost because the ring actually cuts into the head when its bolted down. I think he was running over 1000rwhp and was having no problems. Of course the cost of the rings and getting the machine work done pretty much killed arguments of any financial savings over going with a good aftermarket casting and some good studs.
#34
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It depends on how much boost you're wanting to make. As has been posted, AFR's and Trick Flows are thicker, and so are the newer RHS heads. Here is a link to them. http://shop.brutespeed.com/RHS-54302...-RHS-54302.htm Bob
Thanks