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Old 10-07-2002, 03:02 AM   #1 (permalink)
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long rod motor

I've heard of a long rod motor but I am not to sure about the pros and cons or for that matter what it is. Is it simply a 302 crank with longer 289 rods if thats even possible? If i have a 289 can I simply buy a 302 crank and call it a day, ie re-use the 289 rods and pistons?
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Old 10-07-2002, 10:25 AM   #2 (permalink)
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long rod motor

What are your plans for the motor? In 99.9% of applications, you would never know the difference between a 1.5 and a 1.7 rod ratio (the reason for the long rod setup). The biggest "advantage" woud be to run an off-the-shelf H or I beam rod (like a 6.0 chevy) and a short skirt piston with a high pin that would reduce friction somewhat and still be stable in the bore. This has to be offset by the cost of the modifications (crank mods, rod and piston cost). As for messing with a 5.09 vs 5.154, there is no perceptable advantage.
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Old 10-07-2002, 10:07 PM   #3 (permalink)
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long rod motor

can I use my stock 289 pistons with the 302 crank and 289 rods or will I need to order pistons with a higher wrist pin?
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Old 10-07-2002, 10:14 PM   #4 (permalink)
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long rod motor

I have run 289s and busted a lot of piston skirts (speed pro forged)shifting at 6900.when i went to a 302 and 289 rod (1.71 ratio)never had problems and motor made more power.of course you have to run custom piston
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Old 10-08-2002, 12:56 PM   #5 (permalink)
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long rod motor

what about the pistons need to be custom, different as compared to a 289 or 302 piston?
where can I find them at a good price is there an off the shelf ford or brand X piston that will work.
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Old 10-08-2002, 02:08 PM   #6 (permalink)
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long rod motor

I remember a long rod 351 Windsor with EFI that Hot Rod magazine did a few years ago, and it was a torque beast due to the longer rods. Heavily ported stock intake and stock squirters. It also allowed them to run higher compression that it would normally get away with. Very streetable and saved some money. I think the longer rod evacuates the cylinder better on the exhaust stroke, thereby allowing more on the intaker? Something like that.
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Old 10-09-2002, 01:51 AM   #7 (permalink)
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long rod motor

when ussing 289 rod on 302 crank i used trw L2490 which is a chevy 350 forged nhra series lite weight (around 490 grams).the comp height is 1.560 which will give you a plus .005 out of hole (more comp. and tighter squish).these are priced real low for what you get (around 350.00).of course you have to bore small end of rod to chevys pin diameter.this combo with baby hyd. flat cam.1970 ford heads with 1.94 valve 3.25 rear axle on 3000# car on dot streets netted me 12.69@ 109mph
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