01-27-2005, 04:03 PM
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6th Generation Texan
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Join Date: Feb 2002
Location: Devil's Backbone,RR 32,
TX
Cobra Make, Engine: Lone Star Classics #240,Candy Apple Red,Keith Craft 418w - 602 HP,584 TQ
Posts: 8,157
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Not Ranked
RB,
I had a 428CJ in a '69 Torino. They had an adv. hp of 335, but that was underrated to get into a better NHRA class.NHRA caught on later. The accepted hp was 360. Certainly closer to the truth.
Most all Lone Stars I have followed from a known crank hp to the chassis dyno have shown a 23% loss with a GOOD exhaust system. The loss runs from 28-30 % with the stock sidepipes.The stock mufflers have a 1 3/4 - 2" core.
My 418w has 2" primaries into a 3 1/2" merger collector.The Howe mufflers have 3 1/2" core. You can put your arm through it !
Your 279 rwhp with a 23 % loss put you at 362 hp with some rejetting left to do. 490 Torque.
I think you are right on target.
Check out my gallery and you'll see something that looks familiar.
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