370ci help
11-06-2015, 06:30 AM
#1
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370ci help Im looking to build a budget 370ci ... plans for the engine include up to a 300 shot from a stinger plate (already have) and l92 heads (already have) oem crank. I will be running carbed on e85. I am looking for help on how much to mill the heads and to what compression? what cam to use? what rods and pistons to use? (budget but keep in mind the n2o and stock crank) and what valve reliefs with the piston would be needed? what intake to use? I see 346 builds with 500rwhp I am hoping to get at least that n/a before the n20. If it matters it will be going into a 2800lb s10
11-06-2015, 07:40 AM
#2
Im looking to build a budget 370ci ... plans for the engine include up to a 300 shot from a stinger plate (already have) and l92 heads (already have) oem crank. I will be running carbed on e85. I am looking for help on how much to mill the heads and to what compression? what cam to use? what rods and pistons to use? (budget but keep in mind the n2o and stock crank) and what valve reliefs with the piston would be needed? what intake to use? I see 346 builds with 500rwhp I am hoping to get at least that n/a before the n20. If it matters it will be going into a 2800lb s10
2. Depends on what exactly you are wanting to do as far as the intake goes. Popular choices are the Victor Jr/Super victor combos for the nitrous guys.
3. For that size shot, I wouldn't mill the heads. I would however want a stroker with nitrous.
4. Since you're on E85 CR isn't a huge concern as far as gas goes... I personally would be looking to be in the 12:1-12.5:1 range. I used a +12 domed piston in my old nitrous 370... With stock l92 heads it put me at 12:1 IIRC.
5. I'd do ARP mains.
11-06-2015, 04:26 PM
#3
Since you're running E85 as Lemons mentioned, I would attempt to get the compression as high as possible while still giving yourself enough room with the tune up on a 300 shot.
This is the piston I would recommend: Wiseco PN K447X3 (+12 dome)
This is the rod I would recommend: Callies PN CSC6125DS2A2AH (Callies Compstar H-beam)
If you mill the head .012" and run a .051" thick LS9 gasket with the above piston you will achieve roughly 12.5:1 compression. This will give you a good tuning window to keep from making ashtrays out of pistons on a 300 shot, but still make great power off the bottle as well.
Of course cam timing will also play a large roll in your tuning window when it comes to spraying a shot that big. Relieving the cylinder of heat and pressure from added spent exhaust gasses from such a large shot of nitrous is a cornerstone of a good nitrous camshaft.
This is the piston I would recommend: Wiseco PN K447X3 (+12 dome)
This is the rod I would recommend: Callies PN CSC6125DS2A2AH (Callies Compstar H-beam)
If you mill the head .012" and run a .051" thick LS9 gasket with the above piston you will achieve roughly 12.5:1 compression. This will give you a good tuning window to keep from making ashtrays out of pistons on a 300 shot, but still make great power off the bottle as well.
Of course cam timing will also play a large roll in your tuning window when it comes to spraying a shot that big. Relieving the cylinder of heat and pressure from added spent exhaust gasses from such a large shot of nitrous is a cornerstone of a good nitrous camshaft.