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SVT Shelby GT500
Better performer, 03/04 Terminator or GT500
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<blockquote data-quote="Fourcam330" data-source="post: 2202286" data-attributes="member: 24445"><p><strong>Just Because You Can Doesn't Mean You Should...</strong></p><p></p><p></p><p></p><p>Regardless of how people use them, the 4340 H beams are only "rated" for 750 continuous HP. RPM plays a large roll in the longevity of connecting rods, especially on longer stroke motors such as Modulars. For instance, even though a forged H beam would have been strong enough to take the HP my N/A 5.5 puts out, I would only have been able to spin the motor to 7000rpm, or with a 4.6 8000rpm. Billet steel rods have been tested to 9200rpm in 4.6s and 8100rpm in 5.4s. </p><p>Brian Bradford ran for 3+ years at 550-600rwhp on the stock 98 shortblock (PM rods, hypereuc pistons) before it took a dump. Does that mean everyone should do it? Hell no. </p><p>Rod bolts are also of paramount importance. I wouldn't feel too uncomfortable using said H beams in a 800HP motor if 7/16" ARP 2000 rod bolts were used. However with respect to long term durability, I personally wouldn't try to save any $ by skimping on the rotating assembly. </p><p>You also have to keep in mind that those 800-900 HP Modular motors with forged rods, and especially those with the stock pistons, haven't been running for very long, and that NOTHING lives reliably at 950rwhp+. The parts are simply too stressed.</p></blockquote><p></p>
[QUOTE="Fourcam330, post: 2202286, member: 24445"] [b]Just Because You Can Doesn't Mean You Should...[/b] Regardless of how people use them, the 4340 H beams are only "rated" for 750 continuous HP. RPM plays a large roll in the longevity of connecting rods, especially on longer stroke motors such as Modulars. For instance, even though a forged H beam would have been strong enough to take the HP my N/A 5.5 puts out, I would only have been able to spin the motor to 7000rpm, or with a 4.6 8000rpm. Billet steel rods have been tested to 9200rpm in 4.6s and 8100rpm in 5.4s. Brian Bradford ran for 3+ years at 550-600rwhp on the stock 98 shortblock (PM rods, hypereuc pistons) before it took a dump. Does that mean everyone should do it? Hell no. Rod bolts are also of paramount importance. I wouldn't feel too uncomfortable using said H beams in a 800HP motor if 7/16" ARP 2000 rod bolts were used. However with respect to long term durability, I personally wouldn't try to save any $ by skimping on the rotating assembly. You also have to keep in mind that those 800-900 HP Modular motors with forged rods, and especially those with the stock pistons, haven't been running for very long, and that NOTHING lives reliably at 950rwhp+. The parts are simply too stressed. [/QUOTE]
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SVT Shelby GT500
Better performer, 03/04 Terminator or GT500
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