ok, well instead of piggybacking info off other peoples threads ive decided to make my own thread on this. im planning on doing a 347 stroker, actually a 342 since the block isnt going .030 over but basically the same thing. from what research ive done im thinking the afr 185 heads are what im going to go with but if anyone has any other suggestions they are welcome. the engine is going to be somewhere around 10.5:1 compression ratio which is part of my reasoning to go with aluminum heads. this car is going to be a daily driver so reliability is important. i have heard of some people taking of oil control problems with the 5.400 rod stroker setup, was it just old piston/ring poorly designed or is this still a problem with the current 5.400 rod setup? im not sure what cam i should be using so some help there would be good. eagle's cast steel crank says its good for 500hp n/a so ill go with that but will hypereutectic pistons hold up well for my application? do they have problems at this compression ratio? the kit has forged i beam rods. also will pushrod length change any? i will go with roller rockers but i dont know if ill go with 1.6RR or 1.7's yet
im kind of curious what kind of power this setup is going to make so if someone could run some desktop dyno pulls for me it would be greatly appreciated. i will put main and valley girdles in the motor to give it some more strength but what kind of power is the max for a 302 stock block before it splits open? even with the girdles in it. im hopeing this 347 will get me around 400hp.

sorry for the long post but i wanted to be clear as possible.

 

I am using Eagle Cast Crank, Eagle I Beam Rods, .060 Custom machined Speed Pro Hypereutectic Pistons (352 c.i.), Ported GT40 Iron Heads with oversized Manley Pro Flo Valves and Motorsport 1.7 Roller Rockers, Motorsport Springs. Motorsport X303 Cam. Edelbrock Performer RPM intake with 670 CFM Holley Street Avenger. Approximately 9:5 - 1 compression. I have played with different combinations on my Desktop Dyno and have gotten results anywhere from 370 - 400 hp, with torque ranging from 400 to 420 ft lbs. I am guessing if you build with 10:5 - 1 with the AFR Heads you would be at least 50 above my number. I can dyno it for you but I have to have exact specifics for everything...flow numbers for heads, cam, piston size, compression, carb, intake, everything to simulate. The oil control depends on where your piston ring land falls on the pistons that you are using and I would guess that you would probably need different pushrods with those heads.

 

ill get back to you shortly on all the specific numbers for the engine, also it will be efi so it wont have a carb, would you just need to know the throttle body and injector size then? looks like ill have to get one of them fancy pushrod length checking tools.

 

The AFR185's make 400hp on a stock 5.0HO longblock with nothing more than 1.7 rockers and headers, so you're going to be well north of that.

 

i knew they were good but are they really that good? ive heard the cast steel eagle crank is only good for 500hp. but i wont be spinning this motor above 6000rpms maybe 6500rpms on some occasions so will i be safe? that and the hypereutectic pistons will they be good for the kind of power ill be making?

heres the specs i have so far

3.400 stroke
5.400 rod length
-5cc flat top pistons

afr 185 aluminum cylinder heads-
185cc intake runner
60cc combustion chamber
2.02 intake valve
1.60 exhaust valve

camshaft-
crane 444231
duration at .050 intake/exhaust
220/220
lift- .498 int./.498 exhaust

could you try it with 1.6 roller rockers and 1.7 roller rockers so i could see what the difference is?

fuel system will be 30lb/hr injectors with a 255lph fuel pump
75 mm throttle body.
also the exhaust is going to be shorty headers with some flowmaster or flowtech mufflers, and high flow cats, either 2.25 or 2.5 true duals

let me know if you need any other particular info on the setup

 

I know arf heads are good but i didnt think that a set of 185s with rockers & headers could make 400 HP . Thats a 190 hp gain over stock... 73 fomo has a stroker that only makes 360 HP witch i think is good... So if 70 torino does his build like he wants he should be well over 500 HP... Lew

 

?i would think thats a bit optimistic but ill have to wait and see what the desktop dyno results bring in.

also forgot to add that the piston bore is standard 4.00

 

Yeah i think those desk top dynos are really high . Your build sounds interesting . I have an other HO block i would like to stroke to a 347 . Lew

 

Do you have any flow numbers on the AFR 185's? I could look them up, but if you have them that would be great. I have two different cpu dyno's and they both are fairly close. I think the numbers are pretty darn accurate, if you put in the right info. Junk in = Junk out. I have matched different dyno runs that i have seen in mags, etc. and they usually are uncanny close. Actually I stated 370-400, I meant I've gotten results between 360 and 400...I just erred to the conservative side for my sig.

 

I also posted this info on your post about the 1.6 and 1.7 rockers arms. These are actul dyno results from the mag....that Conanski was speaking of.

This was from a Car Craft Mag test ..... They were shooting for 400hp on 5.0

The foundation for the test was a bone-stock 5.0L H.O. engine taken from a '91 Mustang. As delivered, 5.0 engines of this vintage had forged-aluminum pistons, a hydraulic-roller camshaft (see spec chart), a double-roller timing set, and stamped 1.6:1 nonadjustable rocker arms. Rated static compression runs around 9.0:1 with the stock cast-iron E7TE cylinder heads, which are equipped with puny 1.78/1.46-inch intake/exhaust valves and nominal 60cc chambers. With stock fuel-injection, this engine was factory rated at 225 hp at 4,200 rpm and 300 lb-ft of torque at 3,000.

Our test engine maintains most of those specs, with the only alterations being a quick bottle-brush hone to clean up the cylinder walls and a set of fresh rings and bearings. We baselined the freshened-up short-block with a pair of rebuilt but otherwise stock E7TE factory heads, the stock hydraulic-roller cam, stock tubular exhaust manifolds, and a Weiand Stealth dual-plane intake topped with a four-barrel carburetor. That combination developed 278 hp at 5,200 rpm and 315 lb-ft of torque at 4,100 on Westech Performance's SuperFlow 901 engine dyno.

We stepped up to a pair of Doug's Headers stepped Tri-Y headers and bolted the AFR heads onto the short-block with a set of ARP head bolts and a new set of Fel-Pro head gaskets, and reinstalled the Weiand dual-plane along with a brand-new Road Demon Jr. 625-cfm carburetor. With 35 degrees of total ignition lead and 70 jets in the primary metering block, the little 302 produced a jaw-dropping 382 hp at 6,000 rpm and 368 lb-ft of torque at 4,200, a gain of 104 hp and 53 lb-ft solely from the heads and headers.

At this point, we briefly considered swapping the stock cam for a larger 'stick to see if we could crest the 400hp mark, but that would have been too obvious, not to mention a fair bit of work, and we were feeling lazy that day. Far simpler would be to swap on a set of higher-ratio adjustable roller rockers. The higher-ratio rockers offer the benefit of increasing effective lift and duration at the valves without compromising the inherent driveability of the mild stock cam. Comp Cams offers the perfect product for this application with its aluminum adjustable 1.7:1 roller rockers (PN 1054), which bolt onto the stock cylinder-head pedestals and allow easy valve adjustment with a pushrod-cup adjuster nut. We had the valve gear swapped in about 15 minutes (we didn't even have to change the pushrods), and pulled the handle on the dyno. Success! As expected, the higher-ratio rockers increased the area under the curve of the stock cam, pushing output to 405 hp at 6,200 rpm and 380 lb-ft of torque at 4,300, a gain of 23 hp and 12 lb-ft of torque.

Soo.....I stated that you should see at least 50hp above my numbers....I was guessin around 420 - 450 hp. I'll plug em in here shortly and see what I get.

 

heres a link to a flowchart on the afr 185s, i think this is the flow numbers your looking for?

http://www.flatlanderracing.com/imag...Flow-Graph.gif

they have 2.02 intake valves and 1.60 exhaust valves

 

yep...except for I will probably tone down a touch as this is for 4.060 bore which actually increases flow slightly.

 

ok i did notice that, thanks a bunch man. i look forward to seeing the results

 

Here's my first stab...increasing lift (1.7's) showed about another 7 hp. I used Ford E303 cam profile as I think it is identical to the Crane you spec'd and I already had the cam file saved. I'll keep playing with the numbers......my guess was right on target!

 

Here's the numbers for my 347 with the ported GT40's and Manley valves....just for comparo. I am running X303 cam, which has more lift and durantion than the E303.