302 vs 306

dlb1982 · 10-06-2002, 07:29 PM

At one time i was going to get a brand new block and bore it to a 306. Anyways I was reading an article by a guy who said that a 306 will not produce any more power then a 302 and that actually the weight of a bigger piston needed will make it have even less. This sorta goes against what i was thinking...

Is this true? It made me think would it have been worth boring the new block? And now that i have a used block (much cheaper) should i not bore it all the way to a 306?

'89GTStang · 10-06-2002, 07:51 PM

I do not think that the difference between a 302 and a 306 is going to make any noticable difference. I definately would not bore out a new block that is in good shape. I don't belive that heavier pistons would affect power much but may put more stress on the rotating assymbly. I think the brand of piston would make a bigger weight difference then the .030" overbore would make. But this is just my opinion of the matter.

10-06-2002, 07:29 PM	#1
dlb1982 Registered Member Join Date: Sep 2002 Location: Macomb IL Posts: 42	302 vs 306 At one time i was going to get a brand new block and bore it to a 306. Anyways I was reading an article by a guy who said that a 306 will not produce any more power then a 302 and that actually the weight of a bigger piston needed will make it have even less. This sorta goes against what i was thinking... Is this true? It made me think would it have been worth boring the new block? And now that i have a used block (much cheaper) should i not bore it all the way to a 306? __________________ 94 GT (Full length headers, Off Road H Pipe and Flowmasters) MSD Ignition, 75 shot nitrous, cold air induction. 65mm t.b. pulleys and 3:73 gears. everything else STOCK!! 60' = 2.04; 1/4 = 13.9 on street tires dynoed with 87 octane at 240hp 310 lb torch w/out nitrous. Its a pooch but im working on it.

10-06-2002, 07:51 PM	#2
'89GTStang Registered Member Join Date: Apr 1999 Location: greenwood, ar Posts: 118	I do not think that the difference between a 302 and a 306 is going to make any noticable difference. I definately would not bore out a new block that is in good shape. I don't belive that heavier pistons would affect power much but may put more stress on the rotating assymbly. I think the brand of piston would make a bigger weight difference then the .030" overbore would make. But this is just my opinion of the matter. __________________ '89 GT K&N, Twisted Wedge heads, TFS intake,FMS 1.7 rockers, Trick Flow stage 1 cam(221/225 .530in\.542in) , 3.73's, headers, off road H-pipe, Flowmasters, FMS Clutch, Tremec, PRO-5.0, FMS driveshaft, fluidyne alum. radiator, and more to come.