So im doing research tryin to figure out what i want to do with my 84 fox im planning a 347 and im going to run a 150 shot of nitrous i would like 400hp with out it though! but i have 2 questions im not sure about 1. What heads work good in this situation and are they affordable? 2. What would be a good cam for this set up i just read an article on the new comp cams big mutha thumper which would sound sick and they compared it with some other proven cams and it seemed to put out power as well as sound really nice? PLease help!
Are you going to run a flat tappet cam or Hyd. roller? TF Twisted Wedge heads will allow 2.02 valves without piston mods(except 86 models with no valve reliefs) or you can use the GT40 X heads. The Trick Flow TW set-up for EFI on a 306ci is good for 360hp.
Are you going to run a carb set-up?
yea man i want to go with a full roller set up and its on an 84 so im going to keep it carbed for sure plus i heard alot of good things about the twisted wedge heads ill have to do more research i leave in the morning for texas for like three weeks so ill get back to you as soon as i get to a computer thanks for your help!
I thought you needed special pistons to run TW heads because of the different valve angles and 2.02 valves. Notching for valve clearance is something to keep in mind if you buy heads with 2.02 valves.
If you're planning to drive it on the street at all, AFR165 heads. If it's a strip car get the AFR185 heads.
Some dyno results and build specs. 421hp from a 302 with a radical, but streetable, roller cam and AFR165 heads...so you'll fall a$$ backwards into 400hp with a 347.
All the Comp XE cams rock and I've heard the Thumpr's are pretty strong too. If it's a street car buy less cam than you think you want (~270* for flat tappet or 280* for a roller). Start with a later model roller block and go roller if you're building it from scratch.
thats pretty much what i have been seeing to now my question is this roller cam set ups are spendy and flat tappet is more afford could i still get 400 horse with a flat tappet or should i spend the extra bucks on the roller cam!
A flat tappet will make as much HP as a roller given roughly the same lift and duration, so there's no need to spend the extra $$ on a roller conversion from a strictly performance point of view.
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Paul O
1990 F150 4x4 XLT X-Cab 5.0, 3.55, Comp 35-349-8, Flowtech LT's to 3" single, FRPP Mass Air Conversion
Under construction: '85 351HO, Dart Iron Eagles, Roller Rockers, Typhoon intake, Crane 444232, 24lb Injectors, TweecerRT, Innovate LC-1 wideband O2
1990 Ranger 2wd, 2.3 Briggs & Stratten, 5-speed, 3.08 gears, sliding rear window.
If you're planning to drive it on the street at all, AFR165 heads. If it's a strip car get the AFR185 heads.
what is bad about running the 185cc heads on the street? i was looking at the heads but the 185cc heads are not that much different as far as flow it is an increase but im not sure why it would be a problem also i was reading up on Patriot-performace.com and RacingHeadsService.com does anybody know anything about those companys products!
yea thats what im thinking but its all going to come down to my budget but im curious what isnt good about the patriots and i was looking at the rhs and they have impressive flow numbers is it just a durablilty issuse?
patriots use old used castings on their iron heads that they buy from customers like you. they dont use new. they will not flow what it says on the internet. they also have had past troubles with valve guides because of loose tolerances being allowed at the factory.
RHS is owned by comp cams. i dont know if they use new castings or not for their cast iron heads. i dont know much about these heads to really say.
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New Plan...
410ci, 10:1, AFD 57cc 2v Heads, Edelbrock Intake and Phenolic Spacer, 725 cfm Road Demon, Roller 219/222 @.050 .535 lift 108 lsa, Bee-Hives, Dual Roller Chain, ARP's, MSD Pro Billet, Hedman Headers, Milodon Pan and HV Water Pump.
