I'd go with the 427 for the extra cubes.
Some will say the longer stroke will cause problems but who knows.
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Would be tough to build a good nitrous piston for the 427.
What would you build? I can see you know what your doing!!!! I have p&p L92's and a port matched direct port L76 intake, 90mm tb, stand alone, 1 7/8 kooks, x pipe true duals, th350, pst driveshaft, moser 12 bolt 33 spline, eaton posi. full suspension, tubular k member and a arms.
Just about all of them, the reliefs are pretty big.
I have had ET 225's , AFR 225's and now Cary's C5x heads on the same exact set up and they all worked fine with cam's up to 900 lift.
I dont see an issue with L92's on it.
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Would be tough to build a good nitrous piston for the 427.
A stock piston would probably be ok if he's just gonna spray 250 BUT we both know how it goes. You start out saying just 250, then 300, then 350, then you end up using half a bottle per run. (1/8th mile) LOL
If you are TRULY only going to spray 250 any decent aftermarket piston will be fine as long as you know what you are doing. I've sprayed more than that on stock pistons without any issues.
Personally I'd go with the 427 because it sounds cooler when you say "I've got a 427 in my car" than it does when you say it has a 418.
There is no substitute for cubic inches. (Says the guy with a stock cube motor LOL)
__________________ 2001 SS A4 (part owner) 7.39 @ 93 1/8th
1999 Z28-Stock cube, Glide, 9", 2 guns
Best E.T. 6.03 @ 113 -- 9.36 @ 145
Lookin for crazy 8's
A stock piston would probably be ok if he's just gonna spray 250 BUT we both know how it goes. You start out saying just 250, then 300, then 350, then you end up using half a bottle per run. (1/8th mile) LOL
If you are TRULY only going to spray 250 any decent aftermarket piston will be fine as long as you know what you are doing. I've sprayed more than that on stock pistons without any issues.
Personally I'd go with the 427 because it sounds cooler when you say "I've got a 427 in my car" than it does when you say it has a 418.
There is no substitute for cubic inches. (Says the guy with a stock cube motor LOL)
I can't for sure say only a 250, I have direct port jetting for 400 shot
Like ATV said for a good nitrous piston stay away from the 4.1 stroke on a stock deck hight. as you increas stroke your piston "meat" gets smaller or your rod gets smaller both of which are not good on a nitrous motorn. we built a 396 for a reason over a 408 and its because you can hit the 396 much harder. You can have a 427 and be limited to 200 or a 396 and pump 400 threw it like its nothing. which do you think makes more and goes faster?
For the OP id get a steal on that iron 396 ATv posted then with the money you save ditch the Stock L92's and put a good set of ET's on it. It will make more on the motor and still take more punishment.
__________________ Steve
GBR Shop car 5.23 @134 1/8
2007 Pump Gas Drag Champ 8.9@157
Thanks to
Glen Burnie Racing,Tony Mamo @AFR,George @ Kooks Headers, Cary @ PIS ,Eric @ HKE
For the OP id get a steal on that iron 396 ATv posted then with the money you save ditch the Stock L92's and put a good set of ET's on it. It will make more on the motor and still take more punishment.[/quote]
Thats what I'm trying to do now. ET what? 245's???
When I was asking Erik about this he said the most he would spray on a 427 LS3 was a 200 and only if the tune was spot on.
exactly. like ATV said Erik explained ot us why we should go with less stroke and a better piston and it has worked great.ThAT WAS 3 YEARS AGO. nOW WE HAVE A BETTER HANDLE ON THE NITROUS WE understand why.
__________________ Steve
GBR Shop car 5.23 @134 1/8
2007 Pump Gas Drag Champ 8.9@157
Thanks to
Glen Burnie Racing,Tony Mamo @AFR,George @ Kooks Headers, Cary @ PIS ,Eric @ HKE
I'm gonna buy a Ls3 418 or 427, I'm running L92's and a direct port L76 with standalone, which is better for nitrous? At the most a 250 shot.
me personally im buildin a 355 iron block for my maro when all said and done im hoping to be runnin 750 to the wheels and to hold a 2 stage nitrous kit with 200 first stage and 250 the sec. stage
me personally im buildin a 355 iron block for my maro when all said and done im hoping to be runnin 750 to the wheels and to hold a 2 stage nitrous kit with 200 first stage and 250 the sec. stage
Are you saying you want 750 on the gas, because most kits are rated at the wheels. With a 200 1st stage and 250 2nd stage you would need a total of 300rwhp from your engine to reach your 750 goal.
Also with a shot like that I hope its purely a race car because the tune needs to be spot on depending on weather and DA, not to mention track conditions and race fuel only.
I may be wrong but I dont think the heavy hitters of nitrous are spraying that much, but I may be wrong.
__________________ 01 Z28- Magnaflow catback, A4, 4:10's, SLP Lid, more power coming soon......
427 or 418 ls3 for nitrous 
7.39 @ 93 1/8th
