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Old 04-03-2005, 06:04 AM   #1 (permalink)
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Long rod 302

I'm looking for info on a long rod 302. I'm shooting for a 1.76 r/s ratio. I was thinking of using 351 rods to keep the price down. But from my limited searching so far it's looking like no matter which way I go it'll cost a few dollars. BTW it'd be a budget motor. Maybe gt40 heads, and flat-tops.
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Old 04-03-2005, 08:25 AM   #2 (permalink)
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Long rod 302

351 Rods will not work in a 302.I would buy a cheap set of 5.40 i-beam rods from scat or cat http://cgi.ebay.com/ws/eBayISAPI.dll...48117&tc=photo

http://cgi.ebay.com/ebaymotors/ws/eB...category=33620

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Old 04-03-2005, 11:01 AM   #3 (permalink)
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Long rod 302

can someone tell me what is so speacial about a "longrod" 302?

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Old 04-03-2005, 11:10 AM   #4 (permalink)
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Long rod 302

rod ratio has an effect on both power produced and longevity of the motor. long rod will tend to want to rev higher therefore more power. puts the pin higher in the piston and side thrust on the pistons and bore are reduced, therefore wear & friction are reduced.

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Old 04-03-2005, 11:16 AM   #5 (permalink)
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Long rod 302

when you change the rod length/stroke ratio you change the powerband. longer rods usually mean a wider power band. you can also use smaller ports to make the same power, which translates to better fuel efficiency as well. also longer rods allow an engine to rev higher, and a bit quicker as well. long rod engines do have drawbacks though as often times you need aftermarket pistons to make them work. one other thing, long rod engines have less stress on cylinder walls, especially the thrust side. the reason long rod engines do th ethings they do is, the piston has spends more time around tdc, and has more consistant acceleration and deceleration than short rod engines do. for the most part though the difference is nominal untill you make large changes in the rod length/stroke ratio. one more thing, in order to get the best output from ANY engine, you have to build the engine as a system, rather than a bunch of parts put together. long rod engines like smaller ports, wider lobe centers, more lift and less duration, for the most part. short rod engines like more port, tighter lobe centers, more duration and lift. the range is narrow though in either case, though the long rod engine is more forgiving.
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Old 04-03-2005, 11:18 AM   #6 (permalink)
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Long rod 302

A long stroke 302 needs a block with increased deck height such as the M-6010-S302 8.700" "tall" deck block.
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Old 04-03-2005, 04:28 PM   #7 (permalink)
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Long rod 302

Rod ratio means nothing. Zip.
Suit on!
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Old 04-03-2005, 04:40 PM   #8 (permalink)
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Long rod 302

Quote:
On 2005-04-03 11:18, kechke wrote:
A long stroke 302 needs a block with increased deck height such as the M-6010-S302 8.700" "tall" deck block.

bull, i have seen 302's taken out to 363ci. it used a 3.50" stroke crank from a 351c(yes it was modified), with the stock 8.2 deck hieght.
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Old 04-03-2005, 04:44 PM   #9 (permalink)
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Long rod 302

Quote:
On 2005-04-03 16:28, 85mike wrote:
Rod ratio means nothing. Zip.
Suit on!

also bull. a change in rod ratio has shown an increase in power, and a change in the power band. HOWEVER to get hte best results you have to build a long rod AS a long rod engine.
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Old 04-03-2005, 06:52 PM   #10 (permalink)
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Long rod 302

I understand what the r/s ratio has to do with the rest of an engine as a system. I just need to know how I can get it done. The cheaper the better too. So could it be done with 5.4" rods, and custom pistons? It's a more part specific question.
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Old 04-03-2005, 08:47 PM   #11 (permalink)
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Long rod 302

350 chevy pistons and boss 302/standard 289 rods is the cheapest way. Nowdays, finding 5.4 rods with Ford big ends is a bit challenging.....and then, pistons aren't exactly found at Autozone either.

If it were me, I wouldn't bother. The ONLY time I'd make a true stock stroke length "long" rod motor would be if I was building an FE that originally came with short rods and I put long rods in it.

Ironically, the 351M has an excellent rod/stroke ratio. If rod length made such a huge difference, how come it didn't help those slugs?
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Old 04-03-2005, 09:52 PM   #12 (permalink)
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Long rod 302

lighter pistons
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Old 04-03-2005, 09:54 PM   #13 (permalink)
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Long rod 302

Heavy rods!
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Old 04-03-2005, 09:58 PM   #14 (permalink)
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Long rod 302

Build the engine with the piston shape/ design and head/cam combo as your main concern.
The rod length is used to connect the crankshaft and piston together. That's it.
Ask any REAL engine builder if rod length matters to him/her.
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Old 04-03-2005, 10:05 PM   #15 (permalink)
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Long rod 302

If you are set with a 302 block, instad of making it a long rod motor I'd put a stroker crank in it. You will alreday have to change rods and pistons, why not shell out a little more money and get the extra cubes, those will really make more power.
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