Nitrious Build
Thread Starter
Staging Lane
Joined: Aug 2013
Posts: 68
Likes: 0
From: Rochester,Mi
Nitrious Build As the title says im building my first nitrous motor, actually this is my first rebuild in general so excuse my ignorance. Ill be assembling my bottom end as soon as i get my oil pump and connecting rods this month. The motor has already gone to the machine shop and got new bearings, freeze plugs, bored over .30 and im using the stock crank so that was cleaned up. The bottom end will have Scat pro comp connecting rods (25700716), weisco pistons (Pt003a3). The top end will consist of AI's 200cc Head and Cam kit and the intake will be ported for a 58mm throttle body. Im planning on running a progressive shot off the line and slightly after down the road. The shots will be under 150 for sure. Id like advice and opinions on what you guys think about this so far. I wasnt sure about piston rings for nitrous. the land thickness specs for the pistons are .22 .15 and .08. any particular brand? Also for fuel how big of injectors do i need and what brands do you like? Ill be upgrading the fuel pump also. I appreciate any help. 
Are you running a wet kit? If so, then 30 lb SVO injectors are plenty; they'll support any power you'll be able to make with a HR 355 using the stock PCM.
A 150 shot is not a lot of nitrous for 355 ci, no don't have nitrous in your head when choosing the cam. Optimize it for best NA operation with your TC (assuming auto trans?), gearing, and weight, and you'll make the most total power when adding the 150 shot.
I can't help you with pistons and rings; I just run junk stock stuff
A 150 shot is not a lot of nitrous for 355 ci, no don't have nitrous in your head when choosing the cam. Optimize it for best NA operation with your TC (assuming auto trans?), gearing, and weight, and you'll make the most total power when adding the 150 shot.
I can't help you with pistons and rings; I just run junk stock stuff
.22" is the top land thickness but you need to know the crown thickness too because they aren't necessarily equal. You also need to take the depth of the valve reliefs into account. Deep reliefs and .22" thickness could result in chunks coming off of your top land because the area will be really thin, especially if you have the more brittle alloy (4032). 2618 alloy I would be less worried about but I think the cheaper Wisecos are 4032 (even though they can be sometimes labeled as "nitrous ready" which seems deceptive).
The Mahles I have for my boosted 355 have a thick .326" top land and .2" crown at the thinnest point. Then again, my pistons are dished but I still wouldn't assume that top land thickness = crown thickness even though you're getting flat tops. It's all up to the manufacturer, you won't know until you ask one of their techs.
The Mahles I have for my boosted 355 have a thick .326" top land and .2" crown at the thinnest point. Then again, my pistons are dished but I still wouldn't assume that top land thickness = crown thickness even though you're getting flat tops. It's all up to the manufacturer, you won't know until you ask one of their techs.
Thread Starter
Staging Lane
Joined: Aug 2013
Posts: 68
Likes: 0
From: Rochester,Mi
.22" is the top land thickness but you need to know the crown thickness too because they aren't necessarily equal. You also need to take the depth of the valve reliefs into account. Deep reliefs and .22" thickness could result in chunks coming off of your top land because the area will be really thin, especially if you have the more brittle alloy (4032). 2618 alloy I would be less worried about but I think the cheaper Wisecos are 4032 (even though they can be sometimes labeled as "nitrous ready" which seems deceptive).
Thread Starter
Staging Lane
Joined: Aug 2013
Posts: 68
Likes: 0
From: Rochester,Mi
Are you running a wet kit? If so, then 30 lb SVO injectors are plenty; they'll support any power you'll be able to make with a HR 355 using the stock PCM.
A 150 shot is not a lot of nitrous for 355 ci, no don't have nitrous in your head when choosing the cam. Optimize it for best NA operation with your TC (assuming auto trans?), gearing, and weight, and you'll make the most total power when adding the 150 shot.
I can't help you with pistons and rings; I just run junk stock stuff
A 150 shot is not a lot of nitrous for 355 ci, no don't have nitrous in your head when choosing the cam. Optimize it for best NA operation with your TC (assuming auto trans?), gearing, and weight, and you'll make the most total power when adding the 150 shot.
I can't help you with pistons and rings; I just run junk stock stuff
