baffolaman pm'd me and told my the stud size is 3/8. He put in chevy 1.6 roller rockers. Fiero is 1.75 so if i get 1.7 witch is more common, it should be pretty close and be fine.
I have full roller rockers on my duke. You have to use two value cover gaskets or the rockers will hit the cover. Remember to use good gaskets with sealer and don't over tighten.
Small block Chevy rockers , He said he got crane rockers. But just find the cheapest and they'll be fine. stock small block chevy is 1.5 he got 1.6 for more lift.
http://store.summitracing.c...750%2D1&autoview=sku I dont get this thing. It says "each" and shows the whole set. I know i wont use the rods any any other part in the kit. Just the rockers and studs. Does this include them all?
Yes and I'm looking into ways of making it work. According to that site the rockers are sold individually so I might just get one and see what I can do with it. The studs probably wont work but I have access to a machine shop that can whip out a handfull of custom made bots to any spec.
I have a spare cylinder head laying around that I've been wanting to work and in fact got a 200 odd piece roto tool kit today from home depot for 29.99.
I'll keep ya posted.
[This message has been edited by 84Bill (edited 09-22-2007).]
They are designed for a different head (one that has studs in the head where as the 2.5 has bolts) so I'm assuming there may be a difference. Without having the stuff in my hand to see how it will fit I'm just guessing. I do know the bols in the 2.5 head are shoulder bolts, about an inch and a quarter to an inch and a half long... The 2.5 bolts are kinda short and those studs look like redwoods.
It will be a about two more weeks before I can get my grubby mitts one of those rockers... But I will get one.
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12:18 AM
KurtAKX Member
Posts: 4008 From: West Bloomfield, MI Registered: Feb 2002
Don't go with 1.5 or 1.6 rockers The stockers are already 1.73 or thereabouts. BBC rockers would be ok, and it is possible to get a head machined so it will take larger studs.
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01:29 AM
PFF
System Bot
fierodeletre Member
Posts: 834 From: Behind Animal's Drum Set. Registered: Oct 2006
wonder if roller rockers would quiet a duke down some. I would want to do something like this just so I could adjust the valve lash at all. Keep up the good work, boys, and let's seem some pictures maybe? I like the idea of a before and after dyno.
------------------ If you can't be good, be good at it.
Looks good to me. lol, i got a new head a few months ago with new valves, springs everything. It looked really nice. I wish i ported it then. With my duke auto, why does my 2 gear pull harder than my 1st? lol
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07:04 PM
frankenfiero1 Member
Posts: 441 From: maryville TN USA Registered: Oct 2006
I was looking for a girl who was tall and willowy wasps waisted,Ive had to settle for short and willing..if you plan to swap ONLY swap for 88 with balancer crank,this will accept s 10 chevy head which is best cheapest modification for fiero,do not even concider other engine,if you build for maximum power then you need a different crank,, I love a man with big dreams but you must have substantial bank account ,or start dating the rich ugly girl untill project finish..practical but you will not like !!first go to fiero domain and find tripod site for performance duke ,,search S10 head to fiero head your car lost a small amount of torque with thrush,the auto takes longer to get the weight moving,you can not race engine and use clutch to hole shot,, dukes seem to like 2nd and 3rd gear never had auto you should examine what you really want to do,, a younger man normally drives to fast and is to hard on the car if this is you..the junk yards are full of over reved duke fiero,s concentrate on head, use roller rockers, no cam unless you plan on keep engine,port manifolds match, cheap to do,protect valve seats,use stock or msd coil,new timming gears,,The first go fast item is good brakes, premo brakes,just bring stock up to par or use top expensive pads untill you do this only modify head,,any swap is a pain in the buttocks,but your enthusiasm will carry you thru,for now only do the head much improved performance is in the head.. you need an 87 or 88 duke>if you can score cheap with wire and ecm. knowing how I was in 1956 you need a V8 oops bad joke a V6 with a 4 speed most cost effective,,sell yours, buy V6 but run what you brung is now!! I had a ford flat head that look stock but would blow by chevy and olds V 8s(let them jump me out of hole,he he) if you have job and can use all money for fiero,hooray!!buy parts you can easily sell,also index spark plugs,when you first attemp porting, less is better, if you bore go to smallest size rebore the crankcase is not strong. you will never move fast in an auto duke,I know I am a meanie ,when I was a marine once a rattlesnake bit me,curled up and died.go with head mods,timming gears, coil ,I "love" the duke but an auto is never going to give you the rush you want,, my 88 5 speed was faster than my 86 V6 4 speed,but had headers and head work.suprised me,the sucker flew once 2nd was reached,,You will never be satisfied.. I prefer you do the duke!! Im just giving you reality check you will not like..only swap for you is to swap cars before you sink $1000.oo glad you love my favorite car,duke is my favorite engine. Im a cheap old skinflint.so old my insurance covers indian raids
[This message has been edited by uhlanstan (edited 09-29-2007).]
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02:54 PM
82-T/A [At Work] Member
Posts: 25239 From: Florida USA Registered: Aug 2002
One quick comment about using the 85-86 blocks due to the roller cam / lifters. Not all 85 Iron Dukes had the roller cam / lifters. While most did, a good number of the early 85 Fieros still made use of the flat tappet cam & lifter combo. So just double check before you buy...
Thanks 82-T/A, it was already mentioned. When the time comes I'll make sure i get a roller cam.
Once again. I'm not getting this car into any racing. Thou it is fun doing some rallying in the park down the street. thats the farthest it will come to racing. This will be r reliable, strong running. A engine that wont let me down. one that i can take some road trips on.
[This message has been edited by bmaxbox (edited 09-29-2007).]
All 85 engines are roller. I have yet to have somebody show me one that isn't. The easy way to tell if the engine has a roller cam (especially out of the car) is to look at the lifter cover. There was a small change to the casting to accomodate the lifter guides that keep the roller lifters from rotating, and when this change was made, the cover received a minor change. "Flat tappet" engines have a roughly rectangular cover, whereas the roller engines have angled in corners on the bottom. See crude MS paint image.
I'm pretty sure it's the other way around. I used to have an 84 Fiero, and it had flat tappets (as we all know), and at the same time I had an 85 which I bought at auction for $250. I used to just drive it around back and forth to my hourly job when I was in college. I had to do some work on it, and decided I'd replace the lifters. I ordered a set from Discount Auto Parts (they were roller) only to find out that the ones in my engine were flat tappet (it was an 85). The motor was original to the car, but it was a very early production 85. I ended up selling it to V8 Archie many years ago and it was used for a kit car.
I like the idea of a before and after dyno.
