mitchpdavis

I couldn't find much info on the subject so if this had been covered before I'm sorry please let me know where to find the answer.
Seen a fella with a L98 motor powered by a modified lt1 intake. I'm told there is some modifications involved with some machine work. Will I'm interested as hell but I wanted to know all the specs before I just dive in.
What needs to get machined.
What do I do for wire harness/ throttle ect..
do I need to tune the car to run the new intake.
Thanks for all the advice and help.

ANTI VENOM

In a nut shell. You need to drill a hole for the distributor. Modify you fuel rails and lines. Modify the EGR passages on the LT1 intake. (no EGR) The throttle body will fit but because the LT1 intake sits lower that may cause fitment issues. Your wiring harness is basically good, but you will need to do something different with the IAT sensor. LT1's are in the tube that is from the filter to the TB. You need to get a remote thermostat housing and figure out the hose routing and modify the manifold for those connections.
If you are still with us after that, let me know. There are many people who have done it. Just need to find the info. I put an LT1 engine in my L98 car so I don't have the same situation as you do.
Good luck.......

mitchpdavis

How much of a benefit did you get out of the lt1 swap. I have one on stand by but I was told it wasn't worth it.

cv67

is youre motor stock or do you have upgrades planned?
The LT1 wont puke at 4500 rpm, TPI might have a little more snap to the throttle. Pluses and minuses of ea
member by the name of David Frederick in the parts section sells fully converted ones done.

mitchpdavis

My l98 is stock.. But I planed on building either motor ..ported polished heads intake hot cam...03 over bore ect.. and I'm keeping the doug nash 4+3 until funds ate there for the tko500. So I didn't know if I could keep the tranny with putting a lt1 in

THE 383 admiral

Coolant does not flow through the LT1/4 intake.
The coolant also is routed to the firewall side of the heads. cooling them first. You can easily tap the standard pipe thread or my recommendation AN fittings. Then route into the radiator feed line.

Benny42

Do you have iron heads or aluminum? That will answer the Trans question (1 or 2 piece rear seal) Fill out your profile, we can help more if we know what you have.

mitchpdavis

I'll try the profile deal again. Last time I tried it wouldn't do any thing. I'm sure they are iron. It's stock l98 . And my knolage on this car is limited .

RWDsmoke

I've been running one for almost ten years. I set my rev limiter to 6200 and it gets there fast. On a Corvette the remote thermostat housing will fit between the throttle body and water pump and use the factory top hose. Looks OEM that way. You can do all the work yourself. Check out this link:

http://www.eecis.udel.edu/~davis/z28...ke_conversion/

Benny42

What year model is it?

mitchpdavis

Sorry.. much needed info was left out.. Is a 87 TPI l98 with 4+3 all stock no mods.

Benny42

That's good. 1 piece rear seal, aluminum heads, roller cam. Pretty much all the good stuff. If you do swap in an LT1 your 4+3 will bolt right up. A good free flowing exhaust system, headers and duals will REALLY wake up your car.

Tom400CFI

Are you talking about an LT1 engine? B/c it doesn't matter to the trans, what intake you run.

Since you have an '87 you an keep the trans you have and run an LT1 engine, it that is what you're talking about.

.

cv67

Adapting an LT1 intake is a lot less hassle then the motor swap and making everything work more info needed

mitchpdavis

Add I said. .limited knolage on this car .. ate you saying they came stock with the aluminum heads and cam and what not. . Or that's what your recommending for me to do?

ANTI VENOM

Yes both engines have alum heads, roller lifter cam, and 1 piece RMS.

As for the benefit of the LT1 in my car, I really can't answer that. I started out planning a high reving, large duration build.(before LS's became cheap with lots of aftermarket support) After a ride in a turbo V8, that idea was quickly put aside.

Some thoughts though. I personally like the LT1 look. The manifold is easier to work on and around. I think the heads flow a bit better. I have an old school distributor so no need to talk about the opti. I use a double roller tiiming chain and an electric wp. Is the LT1 engine swap worth the hassle. Debatable. Is the LT1 manifold better? Well for me it is. Plenty of guys have made quick TPI cars. What is your goal? That is where we should be starting.

mitchpdavis

First off understand I have lots of repairs and rebuilds on this car before I break into the motor.. But I like to have a game plan instead of going on blind.
I would like to build a nice daily driver that puts out about 350-400 hp no turbo or charger. Not a race car just a corvette that dose what a corvette should. I know in the future I'm going to replace my 4+3 with a TKO 500 or 600 but for now I'm stuck with a 4 speed.
I have no problem building a l98. Or a lt1. I got both. . So Witch every is easier. .I figure l98. This way I don't have to chance harness and it should just be easy. I figure punch the block .03 over. Turn the crank. Put some higher domed pistons with 2 valve relief cut outs. A set of pot and polished heads matched with a mini ram intake from tpis.com with a nice low to mid range cam should do the job.. If that's not 350 hp them I'm on with that. . Is still gonna make good power.

cadmaniac

I've done the swap. It was a while ago, but I remember:

1) Having to go to a small cap distributor out of a camaro.
2) I used epoxy to seal the old intake holes. No welding.
3) Had to get a remote thermostat and housing.
4) Had to make sure to get a particular intake year, something about the fuel lines.
5) Took a couple of weeks of my spare time to make the mods... but biggest problem was the hole for the distributor. Not drilling it, but getting a large washer and grinding it to the correct angle and dimensions. Took a little bit of trial and error, but it worked quite well.

Having to do it over again, the TPIS intake and fuel rails is a much cleaner install, and I spent a lot more than I thought I would with installing it. Lots of nickel and dime stuff drove up the costs.

mitchpdavis

Well. . I'm a machinist. I can mill and turn any thing needed . My biggest thought was power. Is out that much of a diffrent s. But now I've found the mini ram from tpis.com. I'm thinking that's the route I take.

ch@0s

The miniram is very expensive i would educate yourself about alternatives if I were you. You say you are a machinist,
Here is an alternative that is much more cost effective.

https://www.corvetteforum.com/forums...r-hsr-mod.html

Ther is also the F.I.R.S.T. and the Pro Flo I would look into before making a decision. GL