Proven lt1/lt4 combo`s

[kyleozzie]

I am looking for help with a combo for a new motor I want to put together
My current combo is stock with some add ons car runs mid 13`s ,I need more I just recently purchased a complete lt/4 conversion kit ( got a great deal) .I would like to keep as much of this as possible.I am wanting to keep the car reliable and would like to see some mid 12`s. I am on a budget so I want the most bang for my buck.All help would be appreciated I am not opposed to a stroker but was looking at just 30 over 350, I want this to be as reliable as the factory setup, what machine work would I need, do I need 4bolt,steel crank,rods,pistons ? the car is a 97 TA 6sp 410 gear

Thanks Kyle

[MunsterZ28]

port and polish the heads. port the intake. go with alot larger cam. stroker motor with some nitrous youll go 10s or 11s on motor all day


edit: if you want realiable just swap the heads, intake, and hotcam in it and it will be realiable with some nice pep

[JoeliusZ28]

you could just toss my cam on those heads and intake as they are and run mid-twelves. and it would be really friendly doesnt take much to get mid 12s as long as you can drive. you do not get much additional power out of a stroker, id leave it alone.

[81DaytonaPaceCar]

you do not get much additional power out of a stroker, id leave it alone.

I disagree with this...there is no replacement for displacement.

Port the heads, cam, stroker, skip the nitrous, and call it a day...

[1quik6]

Strokers can get really expensive. Trust me.

[98blackbeauty]

All good comments, Nitrous and reliability do not go together, nos puts max stress on engine components, You get plenty of power out of camed stroker but be prepared for the $ hit. To build a stroker and do it right your going to lay out 7,000 to 10,000 for parts and machine work.
If your on a budget, cam it, headers, roller rockers 1:6, and heavy behive valve springs, port job on heads, that will give you about 85 to 110 rear wheel hp increase.

[ThreeHonks]

you do not get much additional power out of a stroker, id leave it alone.

+1000000

If you build a solid 355 setup it will make close to the same numbers as a 383.

There is no replacement for displacement, but we are only comparing a very minimal cahnge of CID. It not like going from a 350 to 454

[meissen]

I disagree with this...there is no replacement for displacement.

Port the heads, cam, stroker, skip the nitrous, and call it a day...

If you're talking HP, I'd agree with Joel. If you're talking torque, then I'd agree with Jeff. There was a 383 stroker that was at the MiFbody Dyno Day and his HP numbers were even with mine - and I think he only had like 20-50 torque more than me.

[DETROITMUSCLE]

All good comments, Nitrous and reliability do not go together, nos puts max stress on engine components

Not accurate at all, more power equals more stress no matter how you make it. Nitrous is not any more stress than any other power adder.

[my95z28]

+1000000

If you build a solid 355 setup it will make close to the same numbers as a 383.

There is no replacement for displacement, but we are only comparing a very minimal cahnge of CID. It not like going from a 350 to 454

+2000000

For some reason, 383 Lt1s don't make the power that you see out of other engines. Seems to be that an equally set up 350 or 355 only makes 10-20 rwhp less than a 383. For the price, that is no where even close to worth it.

[Caveman]

+2000000

For some reason, 383 Lt1s don't make the power that you see out of other engines. Seems to be that an equally set up 350 or 355 only makes 10-20 rwhp less than a 383. For the price, that is no where even close to worth it.

its all in the compression ratio.. most stroker kits ive seen will actualy drop the ratio a couple tenths due to most having inverted domed pistons... but thats just my 2 cents..

i noticed a massive increase in torque when i did my 385 build...havnt dyno'd it yet, havnt had the chance..

[JoeliusZ28]

Not accurate at all, more power equals more stress no matter how you make it. Nitrous is not any more stress than any other power adder.

as far as power adders go you are right, but i would not agree with that with heads or cam. Ported heads make it easier for an engine to pump the air in and out, which was using up power being made by other cylinders on their power cycles. A cam can both add stress and relieve restriction in the same fashion. I firmly believe a H/C motor will hold up longer than a sprayed engine making the same power, assuming the cam doesnt demand extreme RPMs.

I disagree with this...there is no replacement for displacement.

Port the heads, cam, stroker, skip the nitrous, and call it a day...

There is no replacement for displacement but remember that stroked displacement < bore displacement. A 383 isnt a huge increase in CI, if youre going to spend all the money on the build make it worth it and do a 396. However i stick with my original statement, a stroker isnt the most cost effective way to make power. With matched heads and cam they are monsters, but still expensive. He only wants to run mid-twelves... my car is capable of that cam only on street tires.


as long as im not at lapeer

the question i ask is, do you want to spend money on heads and a cam? (headwork even option with LT4s) or build an entire engine?

[klrlt1]

As long as your bottom end holds up to the beating! Do a cam and suspension.

[98blackbeauty]

Not accurate at all, more power equals more stress no matter how you make it. Nitrous is not any more stress than any other power adder.

then why is everybody talking forged pistons and 4 bolt mains to run nos.?
Keyword he used was realiability.

[DETROITMUSCLE]

then why is everybody talking forged pistons and 4 bolt mains to run nos.?
Keyword he used was realiability.

I understand the reliability factor and for that I don't see any form of forced induction to be really "reliable" A H/C setup as Joel mentioned is probably the least problematic setup suitable for his goals. The reason people run forged pistons and 4 bolt mains for Nitrous (NOS is a brand) is the same reason they run forged pistions and 4 bolt mains for a turbo or blower application as well. The LT1 motor will only hold so much power with FI. A 100-150 shot of nitrous is equivalent to slapping on a turbo kit or blower with 6-7 lbs of boost and either setup will last just as long and be just as reliable. Nitrous gets a bad name because it was so easy to use improperly, but with todays advancements in nitrous kits, controllers, and safety devices its just as relaible as a superchasrger or turbo setup but neither are as reliable as an all motor setup.