347 Stroker

[engine_kid]

This sounds like bs to me but I told a friend of mine that my next project after my chevy 350 is a 347 stroker, it sounds like fun. Then he says "you better buy 10 sets of pistons, stroke is to long and pistons hit heads." I think thats a total load of $h!t, that shouldn't happen if you actually take the time and measure stuff and hundreds of people have done it before. I dont know much about Ford engines but all engines are pretty much the same except for somethings but just wonderign what you guys had to say. Thanks.

[bobbys97R]

the stroke is too long from I heard but all Ive ever heard it does is make it burn oil but the I hear the 331 is a better one to build

[91gt347]

Nothing is wrong with a 347. lol WAY back when they came out they had issues with the pin being in the ring lands. Thats what made them want to burn oil. That problem has been resolved a long time ago. Its not 1995 anymore. lol The other issue is the rod ratio. Its no worse than a big block chevy though. which there are still those running around in big trucks from the 70's. Mine(Now my bro's) actually has over 100,000 on it right now. With no issues at all. Dont burn any more oil than the 331. Ive had both. The 347 seems to have a little more torque,and the 331 liked to wind out better in the upper RPMs,because of the rod ratio. As far as the pistons hitting the heads...No idea wth he's talking about there. You cant go wrong with either one. If you want the 347,dont be afraid of it. It will last. If you want to turn it 7500 RPM's I'd suggest the 331.

[juiced2002gt]

Originally Posted by 91gt347

Nothing is wrong with a 347. lol WAY back when they came out they had issues with the pin being in the ring lands. Thats what made them want to burn oil. That problem has been resolved a long time ago. Its not 1995 anymore. lol The other issue is the rod ratio. Its no worse than a big block chevy though. which there are still those running around in big trucks from the 70's. Mine(Now my bro's) actually has over 100,000 on it right now. With no issues at all. Dont burn any more oil than the 331. Ive had both. The 347 seems to have a little more torque,and the 331 liked to wind out better in the upper RPMs,because of the rod ratio. As far as the pistons hitting the heads...No idea wth he's talking about there. You cant go wrong with either one. If you want the 347,dont be afraid of it. It will last. If you want to turn it 7500 RPM's I'd suggest the 331.

dont act like you've got one...you dont know anything about them...muahahahahah

[LT1LT1]

I have a 347 with the longer 5.400 rod which does intersect the piston pin. It does not burn any oil and doesn't smoke. I went with the longer 5.400 rod for a better rod ratio(1.59) as I didn't really even care if it burnt a little oil as it is a street/strip car and not my daily driver. If you go with a 5.315 rod you can keep the oil ring away from the piston pin but you also go to a worse rod ratio(1.56). The worse you get on rod ratio the more the piston tends to rock in the bore which can cause increase wear and oil consumption. I had a friend with the 5.315 rod combo and his smoked and burned oil, go figure! I think proper machine work is more important than the piston/rod combo in my opinion. Sure if your looking to get 100,000 miles out of your engine than the 331 would be a better set up because of the even better rod ratio(1.66) but you will loose marginal horsepower and a bunch of torque. And you will still get beat by the same engine with more cubes. If your planning to run any kind of power adder (12psi+ or 150shot+)with a stroker in a stock block you will always break the block eventually anyways so the choice really is yours! You can probably ask 5 different people about this issuse and get 5 different answers.

[bobbys97R]

Originally Posted by 91gt347

Nothing is wrong with a 347. lol WAY back when they came out they had issues with the pin being in the ring lands. Thats what made them want to burn oil. That problem has been resolved a long time ago. Its not 1995 anymore. lol The other issue is the rod ratio. Its no worse than a big block chevy though. which there are still those running around in big trucks from the 70's. Mine(Now my bro's) actually has over 100,000 on it right now. With no issues at all. Dont burn any more oil than the 331. Ive had both. The 347 seems to have a little more torque,and the 331 liked to wind out better in the upper RPMs,because of the rod ratio. As far as the pistons hitting the heads...No idea wth he's talking about there. You cant go wrong with either one. If you want the 347,dont be afraid of it. It will last. If you want to turn it 7500 RPM's I'd suggest the 331.

my bad just what Ive heard people say. It was a while back when they told me this and I probley was talking to someone who didnt know shit or I just didnt understand them at the time.

[Loadclr]

I believe that they are even making pistons now that address the pin issue on a stroker motor. Just do your research and get the right materials for the job. By the way, I saw a 347 stroker on the juice this weekend at the track and it was very fast.

[91saleentwinturbo]

basically a stroker combo, is this. the crank tends to have a longer throws but the rods and pistons counter that by one putting the rod in a higher place mounted on the piston itself. thats why they have to match the crank with the rod and pistons. a stock rod length is 5.09 and 347 is 5.400 so we are talking just thousands in difference also a 347 also comes from being bored over .030 thousands on the cylinder bores. so the stroke on a 302 is 3.00 and a 347 is 3.40 which is .40 of a difference so they design piston and rods with .400 taller and the pistons pins in the will also mount few thousands higher and also the piston is made a bit shorter so it has the right fit when at tdc ( top dead center) and bottom dead center. but you do have to have a machine shop bore the block and hone the block as well as notch the bottom of the cylinder bores for rod clearances because the stroke does put the rod about .150 thousand into the bottom of the cylinder bores so machine shop will usally notch the bottom for clearance so the rods do not hit the bottoms of the cylinder bores when the crank is rotating . so a stock 302 is 4.00 bore and 3.00 stroke with a 5.09 length rod and a 347 combo has a 302 bored over 4.030 bore a 3.400 and a rod length of 5.400. happy building.

[engine_kid]

thanks guys for your info and if you have any other hints for this jsut say something.

[91gt347]

Look at it like this. If they were that bad. Ford wouldnt give them a 3 year 30,000 mile warranty.