AFR 165's vs. AFR 185's Cyl. Heads

10-05-2001, 01:25 PM

I was wondering if any one out there has installed the 165's on their L ?! I've seen a lot of hype about the 185's ,......but nothing on 165's, at least nothing from anyone on this forum!

If you compare the flow numbers on both these heads, they're very close!! Exactly on the exhaust side. You don't see any big differences in the #'s, until the .600 lift range for the 185's.

Every piece of literature that I've read on the flow characteristics of cylinder heads, has said that get your flow numbers as high as you can, while doing that with the smallest runner size!! (such as the 165's) That way, you will not lose any throttle reponse or low end grunt!!

It seems like the 165's would be a great head for any of us that are intending on keeping our rev's low (around 5400-5500)?!

Need some input & opinions out there?!

10-05-2001, 02:40 PM

i agree

the 165s would be perfect for the average L owner. someone whos not gonna add a blower or something down the road. i think they will see bigger torque gains with the smaller head and torque = better seat of the pants.

if your just wanting more power out of your stock L i think these are the way to go but if you plan on adding a blower or stroking the engine at some point you probably should get the 185s

10-05-2001, 03:20 PM

I have a Power-Dyne on my truck! I also have a Crane (lightning specific) cam that falls off a cliff after .500 lift! I don't think the blower comes into play, Unless (as far *** the difference between these two heads) you've got some big lift on your cam and will be seeing some high rpm's ( which I will not). My truck will never see over the 5500/5600 range!

Quote:

<font face="Verdana, Arial" size="2">Originally posted by Mike Gager:
i agree

the 165s would be perfect for the average L owner. someone whos not gonna add a blower or something down the road. i think they will see bigger torque gains with the smaller head and torque = better seat of the pants.

if your just wanting more power out of your stock L i think these are the way to go but if you plan on adding a blower or stroking the engine at some point you probably should get the 185s</font>

10-05-2001, 03:46 PM

Yes .The 165's would be perfect ...even with a blower! Just keep the orig. cam or at least similar cam specs with a roller cam and voila!Blowers do not like high duration cams and the design of the AFR's are ideal for the 351 IMHO.

10-05-2001, 03:51 PM

165s should be fine.smaller port with higher velocity.Besides,Have you ever seen a Buick turbo V6 head.15 pounds of boost helps a lot.

10-05-2001, 06:26 PM

If you get the 165's you will have to have a machine shop align drill the mounting holes out. They are set up for 7/16" bolts not 1/2"
Otherwise they are a bolt on. Talk to Ken Woodward he is loving his 185's
Later
Steve

------------------
94 Crimson #2826
Born May 6, 1994
NLOC member #343
Team Powerdyne,
13.49@ 102mph
Wanting 12's

'GREASED'

10-06-2001, 03:39 PM

You'll get plenty of velocity on a 351 with the 185s. Plus if you're running a blower it means more plenum space - which is actually more important in boosted applications than is port velocity.

I'd go with the 185s on a 351 or bigger.

------------------
Later!
Jeff S.
Red Lightning #74 in '95 - 11.92@115.2-lotsa mods
White Lightning #582 in '00 - 13.36@101.75- Swanson chip
Blue 1993 Probe GT - 15.36@89.7 stock daily driver
1973 Datsun 240Z - project car
Drive 'em like ya stole 'em!

10-05-2001, 01:25 PM	#1 (permalink)
93whitelightning Guest Posts: n/a View this user's gallery iTrader: / %	AFR 165's vs. AFR 185's Cyl. Heads I was wondering if any one out there has installed the 165's on their L ?! I've seen a lot of hype about the 185's ,......but nothing on 165's, at least nothing from anyone on this forum! If you compare the flow numbers on both these heads, they're very close!! Exactly on the exhaust side. You don't see any big differences in the #'s, until the .600 lift range for the 185's. Every piece of literature that I've read on the flow characteristics of cylinder heads, has said that get your flow numbers as high as you can, while doing that with the smallest runner size!! (such as the 165's) That way, you will not lose any throttle reponse or low end grunt!! It seems like the 165's would be a great head for any of us that are intending on keeping our rev's low (around 5400-5500)?! Need some input & opinions out there?!

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10-05-2001, 02:40 PM	#2 (permalink)
Mike Gager Guest Posts: n/a View this user's gallery iTrader: / %	i agree the 165s would be perfect for the average L owner. someone whos not gonna add a blower or something down the road. i think they will see bigger torque gains with the smaller head and torque = better seat of the pants. if your just wanting more power out of your stock L i think these are the way to go but if you plan on adding a blower or stroking the engine at some point you probably should get the 185s

10-05-2001, 03:46 PM	#4 (permalink)
Mondo1 Guest Posts: n/a View this user's gallery iTrader: / %	Yes .The 165's would be perfect ...even with a blower! Just keep the orig. cam or at least similar cam specs with a roller cam and voila!Blowers do not like high duration cams and the design of the AFR's are ideal for the 351 IMHO.

10-05-2001, 03:51 PM	#5 (permalink)
fairlane Guest Posts: n/a View this user's gallery iTrader: / %	165s should be fine.smaller port with higher velocity.Besides,Have you ever seen a Buick turbo V6 head.15 pounds of boost helps a lot.

10-05-2001, 06:26 PM	#6 (permalink)
sstock Guest Posts: n/a View this user's gallery iTrader: / %	If you get the 165's you will have to have a machine shop align drill the mounting holes out. They are set up for 7/16" bolts not 1/2" Otherwise they are a bolt on. Talk to Ken Woodward he is loving his 185's Later Steve ------------------ 94 Crimson #2826 Born May 6, 1994 NLOC member #343 Team Powerdyne, 13.49@ 102mph Wanting 12's 'GREASED'

10-06-2001, 03:39 PM	#7 (permalink)
FMOS Racing Guest Posts: n/a View this user's gallery iTrader: / %	You'll get plenty of velocity on a 351 with the 185s. Plus if you're running a blower it means more plenum space - which is actually more important in boosted applications than is port velocity. I'd go with the 185s on a 351 or bigger. ------------------ Later! Jeff S. Red Lightning #74 in '95 - 11.92@115.2-lotsa mods White Lightning #582 in '00 - 13.36@101.75- Swanson chip Blue 1993 Probe GT - 15.36@89.7 stock daily driver 1973 Datsun 240Z - project car Drive 'em like ya stole 'em!