Changing Blocks

gmhatr · 07-08-2004, 12:07 AM

I Have a 65 289. I was wondering if the crank journal for the 289 and 302 were the same. Because I Have a Roller Block that I can put the crank and rods in if it will work. By roller block I mean already has the holes drilled and tapped for the lifter girdle. Also I have the heads for this block Which would be better the stock E7 heads or the C5 Heads that Were on the 289. Thanks any input would be great.

tireburner163 · 07-08-2004, 02:42 AM

Yes, the 289 rotating assembly will bolt in fine. In fact that's currently what my LX hatchback has. It has a 1963 289 crank and rods in a 1989 "XXX" casting roller block.

The 65 289 heads and the E7 heads are actully pretty close flow wise. I believe the 289 heads have smaller chambers, and thus yeild a higher compression.

I would suggest some porting while you've got the motor apart, especailly on the exhaust side, and work on the pushrods dogleg on the intake side.

gmhatr · 07-08-2004, 02:51 AM

What do you mean dogleg on the intake side. I had planned on doing a little porting also. What about valves. And springs. I see that you are running 8.3 @ 84 last summer I Was running 9.4's @ 87mph how is that. My engine is stock but I have 410's.

tireburner163 · 07-08-2004, 02:58 AM

There is a dogleg or a bulge in the intake port on the heads. The pushrod hole goes very close to the intake port, and thus there is a bulge. Port this down, but don't go too far because you don't want to break through. Grind it down so the port is 1.10-1.15" wide (use a set of dial capilers to measure). Also on the oppsite side of the port there is a eddy or a dip. Polish this smooth.

What kind of springs you get is determined by your cam.

Adding bigger valves adds more power, but IMHO it's just not worth it because if you dump a bunch of money into stock heads you could have probably bought a set of used aftermarket heads.

Little more info for you....http://www.cmc.net/~xero/Mousesporting.html

-Josh, aka the tireburner

gmhatr · 07-08-2004, 01:26 PM

Also are the 289 pistons the same as the 302.

tireburner163 · 07-08-2004, 07:02 PM

Yes, 289 and 302 pistons are the same. The 289 uses a shorter stroke and a longer rod, but the same piston

-Josh, aka the tireburner

07-08-2004, 12:07 AM	#1
gmhatr Registered Member Join Date: May 2004 Location: Mattoon IL. Posts: 91	Changing Blocks I Have a 65 289. I was wondering if the crank journal for the 289 and 302 were the same. Because I Have a Roller Block that I can put the crank and rods in if it will work. By roller block I mean already has the holes drilled and tapped for the lifter girdle. Also I have the heads for this block Which would be better the stock E7 heads or the C5 Heads that Were on the 289. Thanks any input would be great.

07-08-2004, 02:42 AM	#2
tireburner163 It's a lot like a race car Join Date: Aug 2000 Location: Meridian, MS Posts: 4,130	Yes, the 289 rotating assembly will bolt in fine. In fact that's currently what my LX hatchback has. It has a 1963 289 crank and rods in a 1989 "XXX" casting roller block. The 65 289 heads and the E7 heads are actully pretty close flow wise. I believe the 289 heads have smaller chambers, and thus yeild a higher compression. I would suggest some porting while you've got the motor apart, especailly on the exhaust side, and work on the pushrods dogleg on the intake side. __________________ 1987 Buick T-type 1998 HD Electra Elide

07-08-2004, 02:58 AM	#4
tireburner163 It's a lot like a race car Join Date: Aug 2000 Location: Meridian, MS Posts: 4,130	There is a dogleg or a bulge in the intake port on the heads. The pushrod hole goes very close to the intake port, and thus there is a bulge. Port this down, but don't go too far because you don't want to break through. Grind it down so the port is 1.10-1.15" wide (use a set of dial capilers to measure). Also on the oppsite side of the port there is a eddy or a dip. Polish this smooth. What kind of springs you get is determined by your cam. Adding bigger valves adds more power, but IMHO it's just not worth it because if you dump a bunch of money into stock heads you could have probably bought a set of used aftermarket heads. Little more info for you....http://www.cmc.net/~xero/Mousesporting.html -Josh, aka the tireburner __________________ 1987 Buick T-type 1998 HD Electra Elide

07-08-2004, 07:02 PM	#6
tireburner163 It's a lot like a race car Join Date: Aug 2000 Location: Meridian, MS Posts: 4,130	Yes, 289 and 302 pistons are the same. The 289 uses a shorter stroke and a longer rod, but the same piston -Josh, aka the tireburner __________________ 1987 Buick T-type 1998 HD Electra Elide

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07-08-2004, 02:51 AM	#3
gmhatr Registered Member Join Date: May 2004 Location: Mattoon IL. Posts: 91	What do you mean dogleg on the intake side. I had planned on doing a little porting also. What about valves. And springs. I see that you are running 8.3 @ 84 last summer I Was running 9.4's @ 87mph how is that. My engine is stock but I have 410's.

07-08-2004, 01:26 PM	#5
gmhatr Registered Member Join Date: May 2004 Location: Mattoon IL. Posts: 91	Also are the 289 pistons the same as the 302.