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post #1 of 11 Old 07-26-2008, 08:14 PM Thread Starter
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nitrous question

I have a 357w with j302 heads on a 250 shot with fogger it has went 6.36 @111.8 in the eighth in july heat I think it will run 6.20's (9.90's 1/4) in the cool at rockingham in sep. i wont to build a 438w dart block and 4340 rotating assembly with my top end (bigger cam) and another stage (plate 200 hit) what rotaing assemby would you go with eagle or scat and what would be the best piston to use with this amount of nitrous (should they be coated or not). My goal is 150 in the quarter it should run 135 to 138 now do you think the more cubes and nitrous will be enough.
Thanks mike

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post #2 of 11 Old 07-26-2008, 08:52 PM
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You're going to need a more cylinder head. I don't even think the J's have a 2.02 intake valve do they?

I don't think they've even been made in the last 10 years! lol There bee QUITE the improvement in technology since those heads were the ones to have.

First, what compression are you running? is this a stret car at all?
Don't right, a 438 with a single fogger will go 150+. The eagle stuff will take it, and you won't have to spin of lean on it too hard to do it.

If you're looking for out of the box stuff... the TFS R would be good, or maybe a AFR 225. If it's more strteet oriented, an AFR 205??
Bottom line is, a 438 and one unit will get you there, but the J302's are going to hurt ya...


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post #3 of 11 Old 07-26-2008, 09:36 PM
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You could do it with your current bottom end, if you changed the heads. As long as your intake and cam match them.

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post #4 of 11 Old 07-27-2008, 10:30 AM
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my 357 and a 100hp shot goes 110 in the 1/8.on a 225hp shot it'll go 114 in the 1/8 and trap 140mph.change the heads and it'll improve.btw I have tfsR heads on top of a stock crank and rod shortblock
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post #5 of 11 Old 07-27-2008, 04:43 PM
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Yup, and my 352 and a 150 runs the time in my sig. Thats with AFR205's, A Trick Flow R lower/Hogans upper, and a small hyd roller cam.

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post #6 of 11 Old 07-27-2008, 06:33 PM Thread Starter
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Quote:
Originally Posted by 88gtguy View Post
You're going to need a more cylinder head. I don't even think the J's have a 2.02 intake valve do they?

I don't think they've even been made in the last 10 years! lol There bee QUITE the improvement in technology since those heads were the ones to have.

First, what compression are you running? is this a stret car at all?
Don't right, a 438 with a single fogger will go 150+. The eagle stuff will take it, and you won't have to spin of lean on it too hard to do it.

If you're looking for out of the box stuff... the TFS R would be good, or maybe a AFR 225. If it's more strteet oriented, an AFR 205??
Bottom line is, a 438 and one unit will get you there, but the J302's are going to hurt ya...
yeah ive been thinking about th tfs r head alot because my headers have the same bolt pattern but still what about which rotating assembly and pistons
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post #7 of 11 Old 07-27-2008, 06:35 PM Thread Starter
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do you guys still not think another 200 shot and 80 inches will net 12-15 mph in the 1/4
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post #8 of 11 Old 07-27-2008, 09:20 PM
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do you guys still not think another 200 shot and 80 inches will net 12-15 mph in the 1/4

You end up in a situation where you are just going to be pushing against the head... Actually going bigger CI wise would make it worse I think. Reason being, any extra air that could have been used by introducing more nitrous will be used up by the extra engine size.
PLUS your safe tune window is get VERY narrow putting that much nitrous on a motor. Hell you can leave the nitrous and CI situation alone, and just upgrade heads and cam and you'd be where you're looking to go for less $$$$$$$$.

It's just not enough cylinder head...

That's why I mentioned a TFS R it has both header paterns, also a TFS street heat would be ok. Both heads will support big power.

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Last edited by 88gtguy; 07-28-2008 at 04:00 AM.
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post #9 of 11 Old 07-27-2008, 11:01 PM
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imagine building a 14:1 c/r 360" 8.2 decked motor, and putting a set of e7 heads on it. Then spraying it..... Sounds asinine doesn't it?

Buy some heads before you go out and spend $5k on a short block. You'll meet your goal with a simple heads and cam swap (assuming you already have a decent intake.)

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post #10 of 11 Old 07-28-2008, 09:00 AM Thread Starter
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imagine building a 14:1 c/r 360" 8.2 decked motor, and putting a set of e7 heads on it. Then spraying it..... Sounds asinine doesn't it?

Buy some heads before you go out and spend $5k on a short block. You'll meet your goal with a simple heads and cam swap (assuming you already have a decent intake.)
very good point you guys helped me make my mind up my brother in law is gettig rid of alot of his c3 stuff i might do that or tfs r with a single stage

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post #11 of 11 Old 07-31-2008, 08:41 AM
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I'm running 225 shot on my 347 and running 6.4's without power shifting. I'm sure you'll pickup with some bigger cylinder heads

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