Best bore & stroke under 400inch?
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From: lombard,IL
Best bore & stroke under 400inch? Im kicking around the idea of running a program class.Rules are you have to be 400inch or less and you can run a dp nitrous setup with a pill size no bigger than a 36.My question is what bore and stroke combo would be best on the bottle?Big bore short stroke or small bore a throw some stroke at it.I would just like to here if anybody has messed with diffrent combos to find what nitrous likes.
I feel that power adders of any sort need a cylinder head that is unshrouded so I would go big bore, also nitrous creates so much torque that a stroker would be more difficult to keep hooked up on tracks that are less than perfectly prepped- but no one has ever seen a track that wasnt prepped well 
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From: lombard,IL
Originally Posted by 8KickassRS9
you could do quite a few combos, or a max effort N/A 382 all stroke
4.16 bore and 3.67 stroke = 399 cubic inches. You would need the big Darton sleeved block and an offset ground stock crank (or a custom if you have the cash).
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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8 SEC SLOPPY SHOT!!!
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From: lombard,IL
Originally Posted by Patrick G
4.16 bore and 3.67 stroke = 399 cubic inches. You would need the big Darton sleeved block and an offset ground stock crank (or a custom if you have the cash).
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You gonna add around 80lbs with the iron block.
I would do a 4.125 aluminum LS1 block sleaved with a offset crank.
3.74 offset gives you 399.85.
I haven't seen a 3.74 offset crank yet but I have seen a 3.72 which would get you almost 398 cubes.
The 382 combo IMO is garbage.
I would do a 4.125 aluminum LS1 block sleaved with a offset crank.
3.74 offset gives you 399.85.
I haven't seen a 3.74 offset crank yet but I have seen a 3.72 which would get you almost 398 cubes.
The 382 combo IMO is garbage.
You need max bore for a class like that. High rpm (8500) and max effort high hp. I would say a 4.150 bore on a 3.7 stroke. Definitely want as much bore as possible to unshroud valves. Geared and wind it to hell. I would think a 4.88 rear gear in a solid roller 4.155 bore would make for a hell of a ride spraying out of the hole.
Good luck though as you're gonna need it with a 8.90 index that will be an extremely competitive class.
Nate
Good luck though as you're gonna need it with a 8.90 index that will be an extremely competitive class.
Nate
Darton 4.125" and Offset Ground Stock Crank - 3.71" stroke or so is what it comes out to 397cid. That will make more power than anything else below 400cid with the right combo. Hell, might even do more than the 408s, simply because the bore allows for so much airflow on the top end, especially if you get a valvetrain that likes 7500+rpm.
Definatly run large bore mid stroke for this appl. Maybe a 4.125 bore 3.875 stroke, with the right parts and heads you will be able to rev the hell out of the thing and get some crazy #'s. Great for spray.
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From: lombard,IL
Who has the best block?I here some guy steve out of califorina i don't know for sure if thats the guy or not.But i would like to talk to a builder that can build a dependable motor without some of these horror storys floating around on the darton blocks.
