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Old 11-18-2012, 04:16 PM   #1 (permalink)
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Default Stroking a 289 to 331

I recently burnt up a piston in mine and I had it bored .030 over I was thinking would it be a bad idea to throw a 331 kit in it I plan on buying some afr 185s as well. I already have hooker longtube super competitions headers, rpm air gap intake, and 650 holley. Is the there any truth in the talk of cylinder wall length being a problem. And any good ideas on a custom cam manufacturer!?! I know a custom cam will be the diffrence on this motor.
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Old 11-18-2012, 04:18 PM   #2 (permalink)
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The headers are tuned as well there actually really nice. And it's a 68 mustang coupe, c4 with shift kit and 2500 "area" hughes stall. Stock rear with new 3.50 gear!
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Old 11-18-2012, 04:30 PM   #3 (permalink)
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No, there is no truth to the rumor nor will a 3.25" stroke cause you any problems. When you have your kit picked out and know what pistons and heads you will be running, contact your cam grinder and give them the specs and tell them what you want the car to do and they will pick the best grind. Once you have the cam's specs, you can pick out the best valvetrain components (springs, locks, rockers, etc.), to work with that particular cams profile.
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Old 11-18-2012, 06:45 PM   #4 (permalink)
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If you are going to stroke it i would go with the 347. I own both a 331 and 347 and there really is no reason to leave out the extra 16 cubes. I would stay with the Scat kit with a cast crank and I beam rods for your application and Forged flat top pistons. i have AFR 185 heads on both engines and they make very good power.
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Old 11-18-2012, 06:50 PM   #5 (permalink)
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That's what I figured I've actually been told by reputable people that the 289 blocks were a little stronger
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Old 11-18-2012, 10:26 PM   #6 (permalink)
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Bump
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Old 11-19-2012, 06:10 AM   #7 (permalink)
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Quote:
Originally Posted by Hookedup12 View Post
I recently burnt up a piston in mine and I had it bored .030 over I was thinking would it be a bad idea to throw a 331 kit in it I plan on buying some afr 185s as well. I already have hooker longtube super competitions headers, rpm air gap intake, and 650 holley. Is the there any truth in the talk of cylinder wall length being a problem. And any good ideas on a custom cam manufacturer!?! I know a custom cam will be the diffrence on this motor.
On your custom cam look into FTI - Flow Tech Induction
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Old 11-19-2012, 08:47 PM   #8 (permalink)
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Ill check them out my engine builder contacted me today to tell me we would start after thanksgiving so ill be thinkin between now and then on what to go with
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Old 11-26-2012, 10:07 PM   #9 (permalink)
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Tongue 289-331

Hooked, yes, by all means build up a 331. A 347 is also just fine, but may cost you some more. The block will be just fine. If you're really stretching a budget, you can buy a 3.25 stroke crank that has 2.123 rod journals and reuse the 289 rods. You'll want to look at pistons with something like a 1.425ish pin height.....which is what lots of custom pistons have, its a normal height if one builds an orange 383. Custom pistons like this will have .927 pins, so you'll have to hone out the .913 289 rods. Cut the piston notches where you want them and re-balance the assembly and you have a nice 331, really cheap.

The factory heads will be just fine IF you re-valve them with 1.94 and 1.6 valves, and you should put hard seats under the exhausts. There is nothing wrong with aluminum heads, but its money you don't have to spend if you don't want to. LSG
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Old 11-26-2012, 10:29 PM   #10 (permalink)
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Quote:
Originally Posted by LSG View Post
Hooked, yes, by all means build up a 331. A 347 is also just fine, but may cost you some more. The block will be just fine. If you're really stretching a budget, you can buy a 3.25 stroke crank that has 2.123 rod journals and reuse the 289 rods. You'll want to look at pistons with something like a 1.425ish pin height.....which is what lots of custom pistons have, its a normal height if one builds an orange 383. Custom pistons like this will have .927 pins, so you'll have to hone out the .913 289 rods. Cut the piston notches where you want them and re-balance the assembly and you have a nice 331, really cheap.

The factory heads will be just fine IF you re-valve them with 1.94 and 1.6 valves, and you should put hard seats under the exhausts. There is nothing wrong with aluminum heads, but its money you don't have to spend if you don't want to. LSG
Sound advice.
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Old 11-26-2012, 11:33 PM   #11 (permalink)
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Quote:
Originally Posted by cmefly View Post
If you are going to stroke it i would go with the 347. I own both a 331 and 347 and there really is no reason to leave out the extra 16 cubes. I would stay with the Scat kit with a cast crank and I beam rods for your application and Forged flat top pistons. i have AFR 185 heads on both engines and they make very good power.
Sound advice as well.
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