VetteNoob

Restrictions I have to meet are... (in order of importance)

1. Must fit under the stock hood
2. Must work with SD and maybe MAF
3. Naturally aspirated
4. '90 vette roller block and crank

I know...I aint asking for much, but that's why Im asking. Im building this in preparation for a 91 model 6 speed, but may consider dropping it into my current 86 until I actually buy a 91. Listing of any specific parts or part#s would be great too. This is a possible 2 year project, but I should be picking up the block in the next week so Id like to know now if what Im wanting is possible. Insights are very appreciated. TIA!

Added: Purpose for the engine and car would be low 12s to high 11s, some autoxing, and just some down right nastiness.



[Modified by VetteNoob, 8:25 PM 8/27/2002]

95AquaC4

I would think the right combination af heads, cam, headers along with some elimination of A/C parts and such,would definately put you close. Prolly gonna have to go a bit further. Anyone else with ideas??


[Modified by 95AquaC4, 6:12 AM 8/28/2002]

Mr Mojo

I know a few LT1's that fit that criteria.

JB'S LT4

If you converted to a ported LT1 Manifold, put a pretty healthy cam cam in there, one with at least 230-240 duration @ .50, a good set aftermarket heads, and bosted the compression around 11:1, big headers and exhaust...You should should be in the 350-380 rwhp range.

Ender85

This sounds much like what Scorp's working on ;)

One question, if I may. Why do you want it naturally aspirated? Wouldn't stick a supercharger or turbo on there give you a lot of bang for the buck?

marthpodi

VetteNoob

So instead of the LT1 manifold, what about a miniram? Would it be safe to say that with making close to 500hp at the crank (assuming a 20-25% PT loss) that decent low end torque shouldnt be a huge problem either using the MR?

VetteNoob

Yes it sure does. I started off the day with a 383 stroker, but then thought that cost of a 350 would be less. Reason I dont want to go SC or turbo is there is more things to break. Plus, not only will I be building the engine, but I would also have to spend the money to buy the sc or turbo too. I think that if I was adding onto an eninge, those options would be the best bang, but completely building an engine, Im not so sure about that.

bill mcdonald

Would something like a 236/244 @50 duration cam get through a smog test?
I am clueless here and a cam about this size is looking really attractive to me.

Ender85

Hmm....forgive my ignorance, but if you're not going with a stroker, or NOS (I assume), or a SC/Turbo, where is all your power going to be generated besides bolt-ons? I don't know that much about engines, but what would adding a "healthy cam" do for engine hp?

The Green Rocket

Sure, I KNOW it can be done :) . But I gotta tell you that you might find it more fun to build on the great torque of the L98.

Thomas

VetteNoob

Please explain what you mean.....Im definitely open to suggestions.

Zix

Simply put, anything can be done with the right amount of money. To be hitting the 380 mark though, on an LT1 you going to have to give up emissions. If you took the intake from an LT4, and used some nicely ported heads you may be able to get it and stay within emission ranges. If emissions are not a concern to you then I would use:

Ported LT4 intake
Ported LT4 or equivelent heads (AFR 190 or 195's)
CC306 cam
Nice 1.6 RR's (Personally I like Crower)
Long tube headers
No cats
Borla or Corsa exhaust
Electric water pump
52 or 54mm ASM throttle body
Lots of tuning!!!

These are the major components that will get you there, I KNOW this will prodice 370-380 RWHP on a 350ci because that's what I'm running (with the exeption of the cam) and I'm getting over 380 RWHP now, and there is still some more I can get out of it for sure.

vader86

I think you can do 350-400rwhp with a 350 L98. But youll need an really aggressive cam to do it


[Modified by vader86, 11:00 PM 8/27/2002]

The Green Rocket

You do not have to spend big money, a well chosen parts combo with lots of tuning will do the trick. Mine currently passes Cali emissions with BETTER than stock emissions - to this I highly credit the miracle of LT1Edit for allowing me to do rapidly test and tune on the dyno, I rented a dyno for a half day of tuning to get it right. I have a few more tricks up my sleeve and I expect my stock short block LT1 to be near 400 rwhp by year end, and still pass emissions. And the kicker is that I intend to achieve this with the HotCam still in place (the HotCam is not emissions legal, but it will pass emissions testing). The CC306 cam would make these results a no brainer, it just that the CC306 cam is difficult to tune for emissions.

Now let's get back to the torque thing I alluded to earlier. The great quality of the L98 350 is its long intake runners that help to generate fantastic low to mid rpm torque, but they do choke it off for high rpm power. Many guys try to fight this by making their L98 do things that work against its ability to torque. Here's the deal, build it for torque and gear it accordingly. With big torque you obviate the need for higher numerical gears, and you also don't have to install a higer stall torque converter. As a matter of fact, one of the more impressive recent performance posts I've seen in the forum (sorry, I forgot who the topic poster was) involved an L98 running stock converter, 3.45 gears, port matched stock intake manifold, no computer mods, no nitrous or blower - and he was running near 12 flat in the quarter mile! Yes, truth be told he had made the engine into a 383, and I can't remeber for sure, but I believe he either ported the L98 heads or put on some affordable aftermarket heads. The trick was that the huge low end torque of such a combo (making a stock L98 into a 383 accentuates its low rpm torque big time) helped him generate a real hole shot off the line (hey, I think that may have been his forum name; Holeshot). You may not want to build a 383 at this time, but just look at what you can do with a stout low end torque engine - who cares if you never get high rpm power if you can majke it accelerate like that!

Thomas

zelement

372rwhp and 346rwtq after $850 in dyno tuning. made 356rwhp and 324rwtq without any tuning.

ZZ-4 shortblock, AFR 195 comp heads, LT-4 Hot cam, and Miniram.

The hot cam is not a big cam by any means. Although I do want a bigger cam, because I want to make over 400rwhp with a ZZ-4.

gtsyellow

my sig with a miniram would have you just under 400rwhp. better heads would make even more. it's a short answer but there's not a lot else to add to it. if i remember right joe90 did his engine real real similar to mine & is making something like 330rwhp and 400rw/ft/lb & that's all with aftermarket TPI. a miniram would probably add a solid 50hp on the very top end & bring the redline up 500rpms or so. i'll have dyno results of what mine does within the month if luck goes my way.


[Modified by gtsyellow, 2:43 AM 8/28/2002]

TIMSPEED

I'm going to try to make about 350rwhp, because with that and alot of practice, it will take me to mid 11's (Proven by BeachBum and probably a few others) Here's what my setup will be and HOPEFULLY it'll do it
355cid 87 L98 motor (forged pistons, good stuff inside)
ZZ9 Cam
Accel Baseplate and Large Tube Runners with a Port Matched Plenum
Edelbrock Performer Centerbolt Heads 60cc chamber/165cc runner (flow 230@.550)
Hooker SuperComp Headers (with a healthy flowing entire exhaust)
I was going to go with the Vortec Setup...but I seen the #'s from that FastBurn heads..and it's like the SAME flow, but has a 210cc intake runner (I'd give up some torque)

BBA

http://forums.corvetteforum.com/zerothread?id=363237

If thats not a case for it...I don't know what is.

BBA

I think the large base is a waste of money. Just look at Hole Shots combo...you can expect to loose maybe 10 HP if you stay with 350 instead of go to a 383, but it will still put you close to 400 at the wheels.

Nathan Plemons

My LT1 made 336 on stock heads, with my new heads I'm shooting for well above 350 after it's properly tuned. I'll dyno it this weekend.

If you put good heads on the L98 and ditch the TPI it is very feasable to expect those numbers. If I put in a more aggressive cam I could get it above 400 pretty quickly.