331 and 347 questions
12-02-2011, 10:37 PM
#1
2nd Gear Member
Thread Starter
Join Date: Aug 2010
Location: ohio
Posts: 248
331 and 347 questions
ok i have a stock 302 block and wanna make a stroker. What is a 347? is it still the 302 block bored to max or is it another block. If its the same block then what makes it the 347 also whats the bore on it and a 331?
12-02-2011, 11:19 PM
#2
5th Gear Member
Join Date: Aug 2004
Location: Arizona
Posts: 4,103
A 347 is a 302 bored .030 over and fitted with a 3.40" stroke crankshaft with the correct pistons and rods.
A 331 is also a 302 bored .030 over and using a 3.25 stroke crank with the correct rods and pistons.
You really can't bore a 302 block past about .060" and have any degree of safety as far is block life goes, even then not all 302 blocks can go that big......
A 331 is also a 302 bored .030 over and using a 3.25 stroke crank with the correct rods and pistons.
You really can't bore a 302 block past about .060" and have any degree of safety as far is block life goes, even then not all 302 blocks can go that big......
12-03-2011, 10:52 PM
#9
5th Gear Member
Join Date: Aug 2004
Location: Arizona
Posts: 4,103
There's a lot of good places to buy the kits from.
One bit of info however, someplaces will tell you it's a balanced kit or they will balance it for $75 or something.
Thats B.S. unless they have the harmonic balncer and the flexplate/flywheel that you're going to be using.
I would aviod the big mail order places like Summit and Jeg's simply because there prices are higher than than some of the smaller places.
I've done a couple engines and I got the rotating assembly from Coast High Performance in California. They have good service and fast shipping. They are part of a company that makes forged pistons so if you want a specail relief or anything like that they are good with it......
One bit of info however, someplaces will tell you it's a balanced kit or they will balance it for $75 or something.
Thats B.S. unless they have the harmonic balncer and the flexplate/flywheel that you're going to be using.
I would aviod the big mail order places like Summit and Jeg's simply because there prices are higher than than some of the smaller places.
I've done a couple engines and I got the rotating assembly from Coast High Performance in California. They have good service and fast shipping. They are part of a company that makes forged pistons so if you want a specail relief or anything like that they are good with it......
12-04-2011, 07:57 PM
#10
4th Gear Member
Join Date: Jul 2008
Location: alabama
Posts: 1,812
There are people here that can help u just ask if everyone paid someone else many of us wouldnt be here on the forums or have the cars we have.... Good luck! As stated dont get the kit prebalanced for many reasons.
