347 bore help
06-11-2009, 07:39 PM
#1
Thread Starter
Join Date: Apr 2009
Location: New Jersey
Posts: 18
347 bore help
hey guys i just got a 302 block bored out .060 and now a 347. i got it today for free (the guy couldnt bring it with him) anyway i want to know if it can go bigger with a bigger crank and how are these engines when bored .060 ive read that they are junk and are useless after.040 but the guy said he had it supercharged and was running 10's in a '90 gt. the engines probably going into a fox body as a street setup to beat on some local ricers and camaros, also whats a set of good heads ?
06-11-2009, 09:41 PM
#2
D.R. THE PATHETIC DORK
Join Date: Jun 2007
Location: West Virginia
Posts: 30,863
so is the motor you got a 347?? cause a 347 is often a .030 overbore with 3.4 crank and 5.315 rods or 5.4 rods
06-13-2009, 09:06 PM
#3
2nd Gear Member
Join Date: Nov 2005
Location: South Florida
Posts: 171
ask the guy what stroke he was running because a .060 overbore and a 3.4 stroke makes a 352ci something does not does right from this person. A .030 bore makes a 347.
06-13-2009, 09:22 PM
#4
5th Gear Member
Join Date: Oct 2005
Location: Ohio USA
Posts: 4,616
tens on a stock, supercharged, .060 block? n/a
347 .060 =trouble
347 .060 =trouble
Last edited by aode08; 06-13-2009 at 09:24 PM.
06-14-2009, 12:01 AM
#5
Thread Starter
Join Date: Apr 2009
Location: New Jersey
Posts: 18
its just the block right now he said .060 bore and it is a 347 it was free so i grabbed it idk the size of the crank he was running
06-14-2009, 10:15 AM
#6
3rd Gear Member
Join Date: Jul 2007
Posts: 528
If it's just the block, it's not a 347. The stroke of the crank, the bore diameter and rod length determine the cubic inches. It sounds like you've got a plain old .060 over 302 block. It's probably not worth much being it's .060 over already.
06-15-2009, 01:46 PM
#7
Thread Starter
Join Date: Apr 2009
Location: New Jersey
Posts: 18
why wouldnt it be worth much ive read that you can make some decent numbers with a .060 over bore
06-15-2009, 02:40 PM
#8
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
Have it sonic checked before you throw money at it..... just a thought.
06-15-2009, 08:05 PM
#9
3rd Gear Member
Join Date: Feb 2008
Location: Florida
Posts: 836
Again, have it sonic checked before you spend anything else.
06-15-2009, 08:57 PM
#10
3rd Gear Member
Join Date: Jul 2007
Posts: 528
I say that because .060 is the max you can go with a 302 (without asking for trouble), so you have no room if the cylinders need any work. I would have a machine shop check the taper with a bore guage before anything. If the taper is out of spec, the block is junk, cause it's already at it's max. If the taper checks out good, have a sonic check done. If that checks out good, you got a good deal (free)!