rusty1

Looking to put L99 heads (small lt1 ) on stock lt1 with nos (200 shot )and run e85. This will be a street car.What cc are the little lt1 heads?

93M6Formula

Ummmm.....Why do you want to use L99 heads? If you have an F-body or Vette LT1 with Aluminum heads you are waaayyy better off. You better have one spot on tune and enough fuel to spray a 200 shot of nitrous on a stock LT1!! It sounds like you are majorly misinformed and need to do some reading before you do something like this...

GIZMO

iTrader: (8)

The combustion chambers are around 51 CC. NHRA blueprint spec. is 45.5 CC. Using those heads is probably a bad idea as they only have a 1.84" intake valve, which won't work so well on a 4.00" bore. The exhaust valve is 1.50".

ahritchie

iTrader: (1)

LT1 head> L99 head

stock LT1 + 200 shot NO2= BOOM!

96capricemgr

iTrader: (1)

There was actually a shop doing engine swaps and such for awhile that claimed the L99 head was exactly the same as the LT1 iron head so I posted this picture. He had a sizable business too which is scary as hell.


You can see how much smaller the chamber and valves are.

Here is a regular link for full size.
http://i120.photobucket.com/albums/o...GR/l99-lt1.jpg

warriorcustoms

iTrader: (10)

Stay with the LT1 heads The ONLY thing a L99 is good for is the crank when installed in a LT1 itll get you 302 cubic inches like the 69 Z28 Other than that its junk Your train of thought is backwards Like 305 heads on a 350 NOT really a smart move either yes compression might jump up But thatll be offset by the valves bein shrouded & not flowing as much SO dont do it!!!!! 200 Shot = BOOM LoL run 150 & call it good But make sure your fuel pump can handle the demand & thats a 150 wet shot!!! IF its a high milage car I wouldnt recommend it at all IF its a high mile motor find another & rebuild it Then go all forged for 200

GIZMO

iTrader: (8)

Actually they are pretty good if you are building 265 ci motor. My limited experience with the L99 showed that it made more HP per cubic inch than the LT1 (Stock Eliminator).

warriorcustoms

iTrader: (10)

LoL Just my 2cents Everyone has an opinion All 265 V8s Ive drove were gutless Hell Ive built 4.3 V6s with more ***** LoL The little heads on an LT1 is like puttin 305 heads on a 350 sbc Kinda like beatin your head off the wall Not real Productive!!!!

GIZMO

iTrader: (8)

On this we agree.

gregrob

iTrader: (8)

What exactly makes you qualified to say that?

ahritchie

iTrader: (1)

What exactly makes you qualified to question a 200 shot isn't a good idea on a stock LT1?

FAD2BLK93

Properly tuned dosen't matter the size of the shot. IMO 200 should not be any problem.

ahritchie

iTrader: (1)

My engine builder says no more than 50% of hp should be added with nitrous (stock lt1 is NOT 400hp)...and ring gaps should be changed at a 200 shot level....I'll agree to disagree

Also, the stock heads/cam severely limit the exhaust side at that point limiting gains. I never said it can't be done; sure it can, but can it be done reliably? The OP should be well aware of the risk of BOOM...it's pretty apparent he has not done the research to properly tune the car and upgrade the fuel system to handle such a large shot of nitrous, or he wouldn't be asking non-sense about putting smaller l99 heads on a LT1 in the first place

96capricemgr

iTrader: (1)

There are a LOT of bolton LT1s out there that survive 150-175 shots long term on stock shortblocks, now adding that on top of heads and cam is not necessarily the same but I think the "no more than 50% NA power" excessively conservative.

I think that if you talk to the guys who play with nitrous and actually know what they are doing that the intake imbalance is the real limiter with the LT1.

trilkb

iTrader: (4)

You guys are all looking at this the wrong way...

We need to encourage him to do this. It may sound stupid, and silly, and a waste of perfectly good money....but ****...its not our money!

Good luck to you man, throw the heads on, pump in the E85...open the n2o tank and spray the **** out of it. Its fuel injected...it'll know what to do . Dont even tune it. This will be a great research project that my wallet wont have to fund. It will answer questions that people religously ask...Can a stock LT1 handle a 200 shot without a tune? Can I run E85 in my LT1 without doing anything? Are L99 heads a good idea? Personally I cant wait for the results.

OP...just promise to take pictures.

gregrob

iTrader: (8)

Oh IDK maybe the fact that I have done it and have first hand experience. Whereas you're just being a parrot

ahritchie

iTrader: (1)

Did you have L99 heads and running e85 fuel too while running the 200 shot?

trilkb

iTrader: (4)

I think he is being a jester more than a parrot