Supercharged 306, 331, or 347
- Thread starter 98blkcnvrt
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Blk91stang
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I am also going the 331 S-trimmed route which should make 550+rwhp easily. Unless you plan on making more than that, I'd stay with a 331 for the most reliability.
If your putting this on a stock block, go with a 306. If your using a good block, go 347. Anyone who tells you a 331 is more reliable than a 347 doesn't know a thing about this stuff. You can hit 500rwhp with the 306, but i'd tone it down. With a stroker your nuts putting that stuff in a stock block.
Ranchero5.0
The Voice of Reason
Ditto on the stock block blown strokers, plus the F cam isn't a very good cam for a street puter governed car because it lays an egg until it hit's about 3200rpm and you are half way out of R'rs. Been there, unhappy with that on a customers car. Not a very good combo unless you like the lopy idle and a lot of noise comming out the back while you go nowhere fast...
A good mild torque cam, long runner intake and a mild blower and you will be running a big block at WOT, but cruising a small block to the gas pumps.
Jamie
A good mild torque cam, long runner intake and a mild blower and you will be running a big block at WOT, but cruising a small block to the gas pumps.
Jamie
$uperstang
New Member
Go with a 331 stock block is fine unless you plan on driving full throttle all the time. Just make sure you get it magnefluxed, boiled and use a main girdle you will be fine.
Grn92LX said:
hes right. if you go too much with a stock block your already gonna have 1 hand in the fire. if you want to do a stroker motor, look into any aftermarket block and then (basicly) your power is endless as to what you can throw at it.
There is no reliabilty issues with a 347 vs a 331, you can not predict how long each will last, built correctly you will not have any issues.
I suggest a 331, you can get a more blower friendly compression ration with a shelf piston over the 347. Also unless you go with a 5.315" rod based 347 you get a slightly taller compression height piston with the 331.
I build a lot of both, you will not have any issues. If you are going to put better then stock internals in the motor definitly go with the stroker. If you are using a stock block, you'll break the block before you hurt a good cast crank, forged rod, forged piston combo. If you are planning on moving up to a DART SPortsman $1800 or Iron Eagle $2100 then I would suggest going with a Forged crank so you can have a near bullet proof assembly, with a rod bolt upgrade you can take the HP rating from about 800 to 1100+.
I suggest a 331, you can get a more blower friendly compression ration with a shelf piston over the 347. Also unless you go with a 5.315" rod based 347 you get a slightly taller compression height piston with the 331.
I build a lot of both, you will not have any issues. If you are going to put better then stock internals in the motor definitly go with the stroker. If you are using a stock block, you'll break the block before you hurt a good cast crank, forged rod, forged piston combo. If you are planning on moving up to a DART SPortsman $1800 or Iron Eagle $2100 then I would suggest going with a Forged crank so you can have a near bullet proof assembly, with a rod bolt upgrade you can take the HP rating from about 800 to 1100+.
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