347??
- Thread starter phillipe
- Start date
It's do able with a big pocket.
I had an 89 coupe with a 347 stock block 302 10:5 compression. AFR 195cc heads, custom grind cam (forget dimensions) trick flow track heat manifold setup and 75mm TB, stock A9L, 42lb injectors an 255lph pump. i pulled 411hp all motor, car went 11.7s once with full interior, (no backseat) 90/10 front struts, 50/50 rears 8.8 with 4.10s 4 cyl springs and 10" slicks. i put a 125 shot on it but never brought it to the track, it was def in the 10s on spray, but the only downfall with a 347 is they burn oil depending where the wrist pin goes. make sure they dont go into the ringlands.
http://media.photobucket.com/image/347%20piston%20in%20ringland/powertvmedia1/DrWrench/strokerpistoncompare.jpg
The one on the left is what would work best.
I had an 89 coupe with a 347 stock block 302 10:5 compression. AFR 195cc heads, custom grind cam (forget dimensions) trick flow track heat manifold setup and 75mm TB, stock A9L, 42lb injectors an 255lph pump. i pulled 411hp all motor, car went 11.7s once with full interior, (no backseat) 90/10 front struts, 50/50 rears 8.8 with 4.10s 4 cyl springs and 10" slicks. i put a 125 shot on it but never brought it to the track, it was def in the 10s on spray, but the only downfall with a 347 is they burn oil depending where the wrist pin goes. make sure they dont go into the ringlands.
http://media.photobucket.com/image/347%20piston%20in%20ringland/powertvmedia1/DrWrench/strokerpistoncompare.jpg
The one on the left is what would work best.
i never thought about it at the time, it was like 4 years ago ^
I was 17 with enough money saved up to do something, bought a ford stroker kit at the time, had my dads buddy build it an was ready to go, i didnt know much about strokers at the time, something new to try, and went with that. Car was stupid fast, just got me in trouble lol
I was 17 with enough money saved up to do something, bought a ford stroker kit at the time, had my dads buddy build it an was ready to go, i didnt know much about strokers at the time, something new to try, and went with that. Car was stupid fast, just got me in trouble lol
He's only got $5k to spend, and to get the #s he's looking for he's not gonna be able to do it with a dart, boss or r block.
As for the oil burning issues, the rod to piston ratio could be an issue in the 347s, but if the shortblock is built correctly it's not an issue. The only time a 347 will burn more oil then any other stroker motor is when using a 5.4 rod and a piston with 1.090 comp height and you don't use the provided rail spacers.
As for the oil burning issues, the rod to piston ratio could be an issue in the 347s, but if the shortblock is built correctly it's not an issue. The only time a 347 will burn more oil then any other stroker motor is when using a 5.4 rod and a piston with 1.090 comp height and you don't use the provided rail spacers.
For starters the pocketbook needs to match the goal. A stock block 347 will have a hard time making 600hp and living. Whoever uses is a stock block to make that much power is not using their head correctly. Also, the myth about oil burning because the pin intersects the oil ring is complete BS. I used to believe it to but I was wrong.
That said, using a 5.4 rod in anything aother than a naturally aspirated combo is not a good idea unless you get custom pistons made where the top ring is lowered on the piston. The top ring land is way to close to the piston top which makes it weak. Fuel and air pressure get trapped in the ring land all the time but when it is weak it has a tendancy to "pop" the ring land off the top of the piston.
The 331 piston has a much larger compression height (use a 5.315" rod) and can be safely used with all power adders.
Again, please do not try to make a 500 to 600hp engine on a 5K budget or you will end up with a disaster on your hands.
That said, using a 5.4 rod in anything aother than a naturally aspirated combo is not a good idea unless you get custom pistons made where the top ring is lowered on the piston. The top ring land is way to close to the piston top which makes it weak. Fuel and air pressure get trapped in the ring land all the time but when it is weak it has a tendancy to "pop" the ring land off the top of the piston.
The 331 piston has a much larger compression height (use a 5.315" rod) and can be safely used with all power adders.
Again, please do not try to make a 500 to 600hp engine on a 5K budget or you will end up with a disaster on your hands.
I'm gonna have to get to the bottom of this now :smash:
Way to put me back to sqaure 1.
Way to put me back to sqaure 1.
Back on topic, being as this is a "331" piston do you see where the pin is? Right smack in the oil ring land. This combo has "pin buttons" which are specially machined buttons that eliminate spiral locks, slip into the pin bore on both sides and are held in by the oil rings (and the cylinder wall). This engine NEVER used a single drop of oil but it's not just 347's that have the pin in oil ring land. As a matter of fact the only for stroker I know that doesn't happen with is a 393 which uses a .030 302 piston.
