302 or 347

93GTDIN · 03-26-2003, 03:34 PM

on the 347 + E7 issue: A friend of mine has E7's on his 342 and the car is way faster than it should be if the stock heads really do indeed "choke" the stroker. Its my opinion that the smaller valves of the stock heads increase velocity, and you pick up lots of low end torque. His car is a rocket out of the hole, but doesnt pull up top like my Heads cam intake 306.

In my personal opinion, go with a 331 or even a 342 but not a 347. The reason being you want to stay with a 4 inch bore if you can. Also, the advantage of the 331 is that the oil ring does not intersect the wrist pin, a common cause of short engine life and compression loss in the bigger 347 strokers. Some companies claimed to have solved this, but I dont put much stock in it. The 331 has a shorter stroke for better rod angle, and a larger piston skirt. A 331 WILL last longer and make about the same power, no question about it.

03-26-2003, 03:34 PM	#1
93GTDIN Registered Member Join Date: Jan 2001 Location: Live music capital of the world, TX Posts: 324	on the 347 + E7 issue: A friend of mine has E7's on his 342 and the car is way faster than it should be if the stock heads really do indeed "choke" the stroker. Its my opinion that the smaller valves of the stock heads increase velocity, and you pick up lots of low end torque. His car is a rocket out of the hole, but doesnt pull up top like my Heads cam intake 306. In my personal opinion, go with a 331 or even a 342 but not a 347. The reason being you want to stay with a 4 inch bore if you can. Also, the advantage of the 331 is that the oil ring does not intersect the wrist pin, a common cause of short engine life and compression loss in the bigger 347 strokers. Some companies claimed to have solved this, but I dont put much stock in it. The 331 has a shorter stroke for better rod angle, and a larger piston skirt. A 331 WILL last longer and make about the same power, no question about it. __________________ 96 Cobra - a bit too stock. 14.0 @ 101