Ported afr225's.. too big for 346 cubes?
04-21-2008, 08:51 PM
#1
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Ported afr225's.. too big for 346 cubes? I shouldnt even tempt myself with this question and talk of buying heads, bbbbuuuutttttt.... Are ported afr 225's too much for a 346 cubic inch motor, maybe with 62 cc chambers to keep the compression up?. I Plan on having the mods in my sig, plus ported fast 92/ 92 mm tb combo, a UD pulley and possibly a water pump. Any thoughts on this? If im going to do heads i want to make around 475 or a bit more to the wheels....
04-21-2008, 09:01 PM
#2
You've got to think about all the people who put Patriots and other ported stock castings on their cars. They are usually 220+ cc. So you really wouldn't be no different from those cars with the exception of more flow across the board, thicker deck, double quench pad, and whatever else.
I dont think they'd be an excellent choice for a 346 at 235cc. I think u'd lose a lot of low end 
04-22-2008, 09:59 AM
#7
I wouldn't recommend it on a stock cube N/A motor with that cam. Sure it will work, but the curve is really gonna hurt. More cubes/bigger cam/FI then yes, especially if you wanna street drive the car I think you would be happier with a stock casting from Trickflow or ETP in the 215 range.
You do know a 205 head will support over 800hp on these motors, so the runner size is not the limiting factor.
AFR makes the 225 in a small bore version, if these are the small bore than it might not be as bad of an option. But, I bet if you talked to most who build street cars and keep the rpms under 7k they would talk you out of that head for your setup.
Regardless of the heads you get if you stick to N/A I would bump the CR up to about 11:1.
You do know a 205 head will support over 800hp on these motors, so the runner size is not the limiting factor.
AFR makes the 225 in a small bore version, if these are the small bore than it might not be as bad of an option. But, I bet if you talked to most who build street cars and keep the rpms under 7k they would talk you out of that head for your setup.
Regardless of the heads you get if you stick to N/A I would bump the CR up to about 11:1.
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04-22-2008, 12:29 PM
#10
If you are looking for every once of peak power and you are willing to get a bigger stall and spin the motor high than 225's might do you better. Or if you have future plans for more cubes or FI it might be a decent option to keep em.
I am pretty happy w/ my 205's and will probably reuse them on a 402 build later. If your in the market to buy any head I would probably consider the ETP or trickflow heads. Those heads have the bigger runner's but it's the lower degree design (think Trickflows are 11*) that help make some nice mid and high lift number's. AFR's are carbed stamped and have a nice deck and rocker studs and in the hands of a good porter can make sick power.
With that said if I was you I would guy w/ 205's over the 225's. w/ 62cc chamber's you will probably have to flycut as well, but that's no big deal. 62cc will probably get you a high 10:1 using the stock gasket.
04-22-2008, 12:57 PM
#12
Picking a head is more than just flow number's, don't get caught up in the number's game.
Guys post dyno and track results all the time here, read up on posts from Vengeance racing, Tony Mamo from AFR, and Cartek. Those guys not only make fast track car's but car's that you can pretty much D/D.
Guys post dyno and track results all the time here, read up on posts from Vengeance racing, Tony Mamo from AFR, and Cartek. Those guys not only make fast track car's but car's that you can pretty much D/D.
04-22-2008, 02:01 PM
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yhea its a long way off anyway I was just tryin to get an insight into what i might wanto do down the road... Heads are just way too expensive to mess around with, and if im gunna do them i want to see some serious power gains....
04-22-2008, 03:17 PM
#14
Don't know where this info comes from but no one has ever made 800 hp with a 205cc head N/A. Just run enough compression and a good size cam, at least 230@.050+ duration and it'll be great.
225 cc isn't huge, people run way bigger than that on race motors even with small cubic inch motors. Just keep in mind the more power you want N/A the higher you'll have to spin the motor, so if you're looking to make max power with a 346 the 225 is the way to go vs the 205cc.
I've seen 350-373's make 800+ hp N/A but trust me they didn't use a 205cc head.
225 cc isn't huge, people run way bigger than that on race motors even with small cubic inch motors. Just keep in mind the more power you want N/A the higher you'll have to spin the motor, so if you're looking to make max power with a 346 the 225 is the way to go vs the 205cc.
I've seen 350-373's make 800+ hp N/A but trust me they didn't use a 205cc head.
04-22-2008, 07:00 PM
#15
04-22-2008, 07:01 PM
#16
You've got to think about all the people who put Patriots and other ported stock castings on their cars. They are usually 220+ cc. So you really wouldn't be no different from those cars with the exception of more flow across the board, thicker deck, double quench pad, and whatever else.
04-22-2008, 07:53 PM
#18
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I would also suggest getting a set of AFR 205's and have Tony Mamo lay his hands on them and work some magic before you get them. Option 2 would be to get some out of the box TFS 215's. Either way you will be happy. My m6 346 made 490 rwhp 445 rwtq. Not too shabby.