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View Poll Results: 330ci or 347ci which is better and stronger
330 6 25.00%
347 18 75.00%
Voters: 24. You may not vote on this poll

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Old 07-05-2004, 04:14   #1 (permalink)
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330 stroker

any body got any info on these kits, price availibilty ect.....
and also give the pro's and con's on wheather it would be better to go for a 330ci or a 347ci.
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Old 07-05-2004, 04:22   #2 (permalink)
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Re: 330 stroker

As far as im aware they both get bored out 30 thou over.
The rod ratio is better than the 347 kit, Im sure i have some 5.0 Performance mags on the 315,330 & 347 strokers.
If your gonna do it .. go out & do it right... 347ci!!
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Old 07-05-2004, 04:27   #3 (permalink)
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Re: 330 stroker

Longer stroke equals more torque. closer to 3.5 inch or more the better! 347 is a 3.4 inch stroke.
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Old 07-05-2004, 04:30   #4 (permalink)
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Re: 330 stroker

i knew that would be your opinion brett, but looking at the overall strength, personnally i think that the 330ci might be a better option to look at for my combo. got a quote today for a 330 with a 4340 steel crank, h beam rods, forged pistons, rings and bearings for ~ $3200 as a kit.
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Old 07-05-2004, 04:37   #5 (permalink)
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Re: 330 stroker

Geez buddy what happ'nd to the stk stroke 300 horse outlook?
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Old 07-05-2004, 04:40   #6 (permalink)
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Re: 330 stroker

just one thing shannon Im not very nice to my car, its forever in the red, Always trying to break something so i can go bigger & better.
Mines held up extremely well.
has done say 50,000 odd kays pretty much all of them hard.
the only thing i break is t5's 2. diffs 4.
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Old 07-05-2004, 04:40   #7 (permalink)
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Re: 330 stroker

still might happen just looking into other avenues?
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Old 07-05-2004, 04:42   #8 (permalink)
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Re: 330 stroker

Here is some info from fordmuscle on stroker kits and rod ratios. Shows why 331 is a better option, although plenty of people are getting great results with the 347's. I would still go 347ci but keep the revs to a sane level (not like you need to rev a 347 anyway).

FORDMUSCLE
Rod Ratios
Another term that gets flung around when talking about strokers is the concept of "rod ratio". More appropriately termed rod-to-stroke ratio, the figure represents the angularity at which the rod forces upon the piston, as a result of the crank stroke and rod length. The angular force imposes a side load on the thrust side of the piston and cylinder wall, resulting in wear on the rings, pistons, and bore.

The consensus amongst engine manufacturers is that a ratio of 1.50" is the lowest acceptable rod ratio for a street motor. Realistically, rod ratios between 1.65 - 1.80 are ideal


One way to understand the concept of rod ratio and it's affect on the engine, is to think of the extreme case where the rod is nearly 90 to the piston. The crank rotation would essentially force the rod through the side of the piston and bore. Obviously this is not a realistic example, but it helps visualize the effect of increasing the stroke.

To diminish these side loads, a longer rod can be used. However a longer rod by itself would likely push the piston too far out. The result is to create a shorter piston. This is what leads to the issues regarding the pin placement on 347 pistons.

The chart below shows the effects of stroke and rod length on the rod ratio for popular 302 based strokers.

Rod to Stroke Ratio of 302 based Strokers (displacement based on 4.030" bore):

302ci 1.696
331ci 1.662
347ci 1.588
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Old 07-05-2004, 04:49   #9 (permalink)
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Re: 330 stroker

Now thats a good way to look at it if you want a lil more rpm!!! the 302 and 331 arent that different! 0.034!!! as apposed to 0.108!!!
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Old 07-05-2004, 05:03   #10 (permalink)
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Re: 330 stroker

thanx edxr8 thats more the info that i was chasing. is there any thing else to consider?
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