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heads (power?)

Reply #15 –
No doubt they are a great upgrade from an E7, hands down!  PV clearance needs to be checked. 

So at worst case you purchase them and there is a clearance issue.  You have two options (well, three if you sell the heads...).
1. Have a custom cam made.  It's all in the cam timing (not lift) which creates PV problems.  A good cam grinder can take that into account and get you set.  Cost is on the range of about $300+ (kind of kills the good deal on the heads though).
2. Cut reliefs in the pistons.  It is possible to do it with the short block in the car.  Isky rents cutters.  I can walk you through the steps if it were to become an issue (I even have a portion of an old head I have used as jig I could loan you).  It's bit of a pain to do. 

Twisted Wedge heads have fewer PV issues due to the slightly different angles of the valves (even though they have larger 2.02 intake valve).  Maybe look for a good deal on them? Still a great OTB head, head & shoulders above E7's.

Good luck on your decision.

heads (power?)

Reply #16 –
Quote from: 86T-bird;216653
Twisted Wedge heads have fewer PV issues due to the slightly different angles of the valves (even though they have larger 2.02 intake valve).  Maybe look for a good deal on them? Still a great OTB head, head & shoulders above E7's.

Good luck on your decision.


Since I've been running a set of TWs and Stage1 cam since '99, I'll X2 that one... And yes my pistons are flat tops, shortblock is a '86 HO, which used the E6s...

heads (power?)

Reply #17 –
I'm not knocking the aftermarket heads...in fact, I think that AFR is probably one of the best...but just don't expect to make peak power before 5000rpm...too much RPM is a good killer of a stock 5.0 short block...I know from experience...I prefer not reving 5.0's past 5500, if it wasn't my DD, I would have a different view.

And yes, I know you can get hi-rev governors for the AOD...that's why I said "if he lets his AOD decide when to shift".

It's an obvious fact that on an n/a combo, you have two options for increasing power...more displacement...or more RPM.
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads

heads (power?)

Reply #18 –
I've heard from alot of Mark 7 and Mustang guys you can get an automatic 60HP at the crank from some emissions legal AFR's.  The big thing is torque!!!!  I've heard they really add some torque to your 5.0HO which is what you want from a street engine.
I see alot of comments about mods being done due to incompatibility.  I've heard AFR's are completely bolt on for most 5.0HO's.
 

heads (power?)

Reply #19 –
Quote
That's also if you don't mind revving to the moon...AFR's run real nice above 5000


Quote
I'm not knocking the aftermarket heads...in fact, I think that AFR is probably one of the best...but just don't expect to make peak power before 5000rpm...too much RPM is a good killer of a stock 5.0 short block...I know from experience


Statement #1 was interpreted to mean they are total dogs below 5K.  Not what you meant apparently, but it WAS what was conveyed...

Statement #2  I know plenty of guys who run 6K+ on stock blocks.  The 5 speed rev-limiter in the H.O. EEC-IV is 6250.  I'm sure tons of people have pushed that limit on a stock block and internals without fail for many miles.  I've been pushin 6K for well over a year without issue.

Quote
I prefer not reving 5.0's past 5500


Run the AFR's/Twisted Wedges with a custom cam or an off the shelf one with a decent amount of lift and as wide an LSA as possible.  This will broaden your torque curve and bring the peak HP RPM down some.  Something with advance built into the design may help as well.
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!

heads (power?)

Reply #20 –
I never implied that AFR's are dogs below 5k...if that's what people took from it then they're reading too far into it...AOD HO computers are limited at 6250 as well...I know stock blocks CAN go past 6k and live, but it's not going to live forever, that's all.  Like I said, if I didn't have to rely on my car for daily driving, I would have a different view of things.

Maybe I'm just a bit paranoid from my last crank failure...lol.  Once bitten...FOREVER shy...I guess if you don't have 300k miles on your shortblock, you'd be okay.

-Don
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads

heads (power?)

Reply #21 –
Quote
I guess if you don't have 300k miles on your shortblock


They ALL gotta go sometime....Turn up the wick to 6K on a forged crank and laugh:evilgrin:
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!

heads (power?)

Reply #22 –
Quote from: V8Demon;217043
They ALL gotta go sometime....Turn up the wick to 6K on a forged crank and laugh:evilgrin:


Or even a decent aftermarket cast crank...anything but a fatigued 300k mile stock crank...lmao...still can't believe that it ran it's best just before it went boom.
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads

heads (power?)

Reply #23 –
Quote from: Sick88Tbird;217044
Or even a decent aftermarket cast crank...anything but a fatigued 300k mile stock crank...lmao...still can't believe that it ran it's best just before it went boom.

They ALWAYS do...

A buddy broke his well used 5.0 crank after spraying it for a couple years, then running over 1600 1/8 mi passes... This wasn't no slouch either... His '88 Tbird 308 regularly ran 8.0 passes @ 87mph(no juice)... Now runs a DSS 331 and car runs low/mid 7.2s... Motor has out of the box Trick Flow heads(does have bee hive springs)... Not sure of the cam but way bigger than the Stage -2 TF he ran in the 5.0...

heads (power?)

Reply #24 –
so do you think i will be able to run the 165's with 1.6 rollers on my flat tops(no reliefs)?? or would the trick flows be just as torquey down low for an all street driven car?

Thanks Guys
88 sport,TW heads, comp xe270hr, cobra u/Tmoss ported lower, 65 mm throttle body, under drives,smog delete,
1.7 roller rockers, cai, k&n, bbk adj regulator, 76mm Pro-m,all MSD ign. MSD dist,18° base timing, 3g alt.1 5/8 ceramic headers, 255lph walbro, 2.5" h-pipe, flowmasters, silverfox valvebody, 3.73 gear,
http://i216.photobucket.com/albums/cc154/flipnbird/DSCF0185.jpg ( RIP : ( )

heads (power?)

Reply #25 –
Quote from: TurboCoupe50;217053
They ALWAYS do...

A buddy broke his well used 5.0 crank after spraying it for a couple years, then running over 1600 1/8 mi passes... This wasn't no slouch either... His '88 Tbird 308 regularly ran 8.0 passes @ 87mph(no juice)... Now runs a DSS 331 and car runs low/mid 7.2s... Motor has out of the box Trick Flow heads(does have bee hive springs)... Not sure of the cam but way bigger than the Stage -2 TF he ran in the 5.0...


Here's my broken 170k mile crank from 2006. This is why I went with a forged stroker kit this time around ;) , hearing that sound of the crank snapping and the engine coming to apart was very bad. It was like someone through a tool box out of a window full of tools.
[SIGPIC][/SIGPIC]

heads (power?)

Reply #26 –
At 170K? Wow. I've seen 5.0 HOs with 200K and they're fine. I guess it's all in how you drive, or who cast the crank that day ;)
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

heads (power?)

Reply #27 –
that broken crank pic reminds me of when I rode over my broken connecting rods and chunks of pistons on my Triumph Bonneville in my cycle days,OUCH