TeEnAgE pHeNoM

iTrader: (6)

Just as the title says. I've been in contact with Martin from Tick and he will be helping me with camshaft selection. I know Martin is a fan of the AI HCR 241 heads because of the additional piston to valve clearance these heads provide. I will be shooting no less than a 250 shot but more than likely 300-400 so the camshaft will be a max effort nitrous grind. I do not care about dyno numbers as I am more concerned with chipping away at the SBE nitrous record. All you nitrous gurus what are your opinions?

AI HCR 241
TEA or AI 243 heads with additional exhaust porting for nitrous
Trickflow 215s with additional hand work by Brian Tooley
Hand Ported 243's by Brian Tooley
???

Flycutting is not out of the question however I'm concerned with the integrity of the stock pistons with as much nitrous as I'll be spraying. Also I'm not interesting in spinning the car past 6600-6800rpm.

Regards,
Jacob

MTC_75vette

I would say the Trick Flows touched up by tooley will give you the best gains. If you want to use AI the ls6 head will make a few more hp over the 241 head and flows more air. If you are going for a new record at the track and want max effort you may want to look at the TFS 225s over the 215s just my opinion.

redtan

iTrader: (5)

400 shot on the stock bottom end? What kind of fuel you plan on using if you don't mind me asking...

Also, out of those choices I would definitely go with some TFS or AFR heads with the thicker deck for extra clamping force.

James@ShorTuning

I would say the TEA CNC with some touchups from Brian would be ideal setup of your options... The larger runner on the TEA 243 heads will really shine on a nitrous setup. Or you could step up to a larger TFS head. They will both make great power. My personal test car is running the TEA st2 with Brians touchups and has done very well on the worn out 110k mile bottom end. My cam isn't ideal for the setup now but still works okay. I've only sprayed a 175 through it so far but plan on hitting it a little harder next spring when the tracks open back up.

TeEnAgE pHeNoM

iTrader: (6)

I plan to use either straight Shell urt 110 or some type of 116 octane. I said it might see 400 but obviously I would like to achieve my goals with less.

TeEnAgE pHeNoM

iTrader: (6)

I've spoken with Tooley about his ls6 heads and he netted some pretty impressive gains on the sauce.

I was really leaning towards to stage 2 ls6 with some Tooley tweaks. However, milling them to achieve 11:1 scr really limits me to camshaft selection and I'm not sure about fly cutting when spraying that much nitrous. That's why the AI HCR 241's caught my attention (Martin mentioned them) because the additional piston to valve clearance wouldn't limit me so much on camshaft selection allowing me to run a nice size cam while still be able to achieve 11:1 scr. I'm just really torn between the combo right now. I believe that I've pretty much narrowed it to the AI HCR 241's or the TEA stage 2 LS6 with tooley tweaks.

garygnu

look at a head with a thick deck .with NOS the cam is the most important.make sure you have good rods and bolts .short shift with NOS,peak power happens earlier .

TeEnAgE pHeNoM

iTrader: (6)

Thanks man. It will be stock rods and bolts. Completely stock bottom end ls1.

Rise of the Phoenix

iTrader: (27)

How about the Trick Flow 220cc as cast heads? You can have AI CNC port them, as they have a program to do so. They would work really well on your setup.

farmington

iTrader: (14)

If you're spraying that much, you had better open up the top ring gap to keep the ends from butting.

Sales@Tick

iTrader: (3)

The one good thing about the TFS heads is you can still keep stock P to V with the 2.04"/1.57" valves that come in them. That said you're still at 64cc which is 10.7:1, but as we discussed, with the amount of nitrous you're going to be spraying, that 3 tenths of compression isn't going to be missed all that much.

TeEnAgE pHeNoM

iTrader: (6)

That's not a bad idea. I think that would cost as much as the TFS 225cc. Lol

Lol. I'm guessing you don't hang out in the nitrous forum much.

I think I've narrowed it down between the AI HCR 241's or the TFS 225. From one extreme to the next...I know I know. Lol

87silverbullet

iTrader: (11)

I'd have to say the TFS heads on this one. IMO you are limiting yourself by staying under 7k rpm. The new heads and cam are going to want to shine in upper rpm ranges an especially on the bottle.

Sales@Tick

iTrader: (3)

The profile we're planning on using will peak at 6300-6400 with those heads and shift at 6700ish. He wants to keep the RPM's down to prolong the life of the SBE for however long it does last.

87silverbullet

iTrader: (11)

I hear you Martin but I have spun a 99 SBE to 7400 for 5 years on a 225 shot. I say spin it up a lil more.

adamantium

iTrader: (3)

^ Thats crazy. What did you do to make it last that long?

87silverbullet

iTrader: (11)

Not a damn thing. There is no magic rpm that these motors are going to magically fall apart.

Havoc40

Can't count Mamo out of the picture

TeEnAgE pHeNoM

iTrader: (6)

I agree. If the nitrous tune is right (not too much timing) these motors are a lot tuffer then people realize. 200 shot is cake for these motors.

wilfredes

The one good thing about the TFS heads is you can still keep stock P to V with the 2.04"/1.57" valves that come in them.