machine work

davidsel47 · 05-11-2004, 08:01 PM

what is the largest dispalcment achievable with a 302, (without changing out the crank).

302 LX Eric · 05-12-2004, 07:21 AM

Keeping the stock stroke of 3.00" you can bore the cylinders to:

.030" over to make a 306 cu in or
.040" over to make a 308 cu in.

I personnally haven't seen anything greater than a .040" over bore on a stock block. It may be possible, but I'm not sure who would make a piston for anything greater than 4.040". Plus, the more you bore the less material between the cylinders which means a weaker block.

E

Rev · 05-12-2004, 10:02 PM

Thne 289/302/5.0 blocks are "thin wall castings". That's great for light weight, but is not good for more than .030 or .040" at he most over bore.

Rev

tireburner163 · 05-13-2004, 10:01 AM

You can bore a 302 out to a .040 have have a 308.

I've seen a early model block taken to .060, which is 310 cubic inches. That way you can have that ultra cool 4 extra hp, it's just not worth it to even worry about it.

-Josh, aka the tireburner

05-11-2004, 08:01 PM	#1
davidsel47 Registered Member Join Date: May 2004 Posts: 1	machine work what is the largest dispalcment achievable with a 302, (without changing out the crank).

05-12-2004, 07:21 AM	#2
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	Keeping the stock stroke of 3.00" you can bore the cylinders to: .030" over to make a 306 cu in or .040" over to make a 308 cu in. I personnally haven't seen anything greater than a .040" over bore on a stock block. It may be possible, but I'm not sure who would make a piston for anything greater than 4.040". Plus, the more you bore the less material between the cylinders which means a weaker block. E __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'

05-12-2004, 10:02 PM	#3
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Thin wall castings Thne 289/302/5.0 blocks are "thin wall castings". That's great for light weight, but is not good for more than .030 or .040" at he most over bore. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

05-13-2004, 10:01 AM	#4
tireburner163 It's a lot like a race car Join Date: Aug 2000 Location: Meridian, MS Posts: 4,130	You can bore a 302 out to a .040 have have a 308. I've seen a early model block taken to .060, which is 310 cubic inches. That way you can have that ultra cool 4 extra hp, it's just not worth it to even worry about it. -Josh, aka the tireburner __________________ 1987 Buick T-type 1998 HD Electra Elide

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