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Critique my plan for my engine

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Critique my plan for my engine

Old 02-06-2019, 10:27 PM
  #1  
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Critique my plan for my engine

So I aquired another car. Itís a 92 Z03 Z28. Itís a nice car, G92, 350 auto car, but it has a knocking motor. The car was so nice and so cheap that I had to buy it. I have a bunch of parts laying around, and I am by no means looking for a rocket ship, but I want to toss a motor together as cheap as I can and make it a little better than stock.

What I have so far;

880 roller 4 bolt block, crank, and set of ďdotĒ or ďhi-proĒ rods. The block has been tanked, honed, main line honed, and cam bearing-ed.

i have a set of 113 aluminum corvette L98 heads, 1.6 comp roller tip rockers, and a stock LT1 cam thatís 205/207 .447/.459 117lsa

I build cylinder heads for a living so freshening up the 113ís and doing some mild porting wonít set me back any money.

I know thereís plenty of heads, and plenty of cams that will make a lot more power, but Iím looking for the idle, drivability, and sound to be as stock appearing as possible.

The cam being a touch better, the rockers giving it a touch more lift, the port work on the heads, and bump in compression should all give it a little more here and a little more there, I feel like instead of doing something fancy for an intake Iíll just go the easy route with an HSR and shut the EGR off in the computer.

What are the thoughts on this combo? I feel like it should run out similar to a stock LT1 at that point right?
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Old 02-06-2019, 11:02 PM
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Re: Critique my plan for my engine

Maybe even a bit stronger. Should be a very nice street engine looking forward to seeing it!
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Old 02-07-2019, 12:19 AM
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Re: Critique my plan for my engine

Iím also putting a set of hold hooker 2460 headers and y pipe on it.

Im thinking stock LT1 24lbs injectors will be plenty, as well as using the stock L98 TB and doing a little port work on the entry, and an air foil.

Behind the motor the motor has a rebuilt trans, I plan on tossing a shift kit in it and a big converter, as well as I have a rear end left over out of my 4th gen that has a set of 3.90ís and the stock 02 torsen carrier that I think Iíll stuff into the 10 bolt.

The end end goal is a laughably cheap et sportsman class car to run out local Wednesday night 1/8 mile bracket class.
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Old 02-07-2019, 11:24 AM
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Re: Critique my plan for my engine

Your plan sounds good. 24lb injectors should be fine and the stock tb as well. I would guess that setup would be 325-350hp with a nice broad powerband. Will be fun.
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Old 02-07-2019, 11:32 AM
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Re: Critique my plan for my engine

You might want to cut down the guides and run a hot cam with 1.6 rockers.
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Old 02-07-2019, 11:44 AM
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Re: Critique my plan for my engine

Originally Posted by Tuned Performance View Post
You might want to cut down the guides and run a hot cam with 1.6 rockers.
Cut the guides, yes. The OP said he builds cylinder heads for a living, so he probably already knows this.

The hot cam would be a good choice for this build too, but the OP also said he wants an idle similar to stock. I think the LT1 cam with the 1.6 rockers fit his goals. It will make good power, smooth idle and easy to tune. Maybe a stock LT4 cam with 1.6 rockers for a few more horsepower, but if the OP already owns the LT1 cam, I would just run it.
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Old 02-07-2019, 12:01 PM
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Re: Critique my plan for my engine

Put a 383 kit in it with everything else you listed..
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Old 02-07-2019, 01:53 PM
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Re: Critique my plan for my engine

Yeah the hot cam sounds like a cam for sure. The LT4 production cam is so close to the standard LT1 cam I canít see if being worth the time and money to buy one when I already have the stock LT1 here. Yes I will definitely be doin bronze guides shelves down low, as well as LS behive springs. I havenít looked too far into it but possibly even do the 8mm valve conversion on the heads.
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Old 02-08-2019, 08:29 AM
  #9  
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Re: Critique my plan for my engine

Originally Posted by charlie6178 View Post
So I aquired another car. Itís a 92 Z03 Z28. Itís a nice car, G92, 350 auto car, but it has a knocking motor. The car was so nice and so cheap that I had to buy it. I have a bunch of parts laying around, and I am by no means looking for a rocket ship, but I want to toss a motor together as cheap as I can and make it a little better than stock.

What I have so far;

880 roller 4 bolt block, crank, and set of ďdotĒ or ďhi-proĒ rods. The block has been tanked, honed, main line honed, and cam bearing-ed.

i have a set of 113 aluminum corvette L98 heads, 1.6 comp roller tip rockers, and a stock LT1 cam thatís 205/207 .447/.459 117lsa

I build cylinder heads for a living so freshening up the 113ís and doing some mild porting wonít set me back any money.

I know thereís plenty of heads, and plenty of cams that will make a lot more power, but Iím looking for the idle, drivability, and sound to be as stock appearing as possible.

The cam being a touch better, the rockers giving it a touch more lift, the port work on the heads, and bump in compression should all give it a little more here and a little more there, I feel like instead of doing something fancy for an intake Iíll just go the easy route with an HSR and shut the EGR off in the computer.

What are the thoughts on this combo? I feel like it should run out similar to a stock LT1 at that point right?
Are you doing anything to address the Intake? The 3.90's are going to be steep with a factory intake runner and nothing to shove air into the motor above 4600RPMs. You may be getting a bump from the cam, but the runners are not going to support the slight bump in RPM and they never Horsepower well.

On the other hand, if you are keeping the TPI runners and going 3.90 so you have a torque monster that you can light the tires up, I think you are spot on. Otherwise, you should be looking to pick up a mini ram. It's basically and LT1 manifold and will match your cam nicely. Going to a deep gear like that will make a fun car to drive. You will have traction issues due to the added torque, and it will run slower 1/4 mile times. Not going to go down the rabbit hole about gearing in this thread, but 3.90 is too deep to get good ETs out of a factory TPI manifold.
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Old 02-08-2019, 10:45 AM
  #10  
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Re: Critique my plan for my engine

No Iím definitely going to do a different intake. I think for this car, Iím just going to go the easy way and go stealth ram. I am mid install on a T ram on my other 92, and I actually bought another T ram for this car, but I am now thinking I want to save that other T ram for later.
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Old 02-08-2019, 11:42 AM
  #11  
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Re: Critique my plan for my engine

Originally Posted by charlie6178 View Post
No Iím definitely going to do a different intake. I think for this car, Iím just going to go the easy way and go stealth ram. I am mid install on a T ram on my other 92, and I actually bought another T ram for this car, but I am now thinking I want to save that other T ram for later.
Then you should be more than fine and I would suggest the LT4 Hot Cam. My brother ran it in warmed over 350, the idle wasn't an issue at all and he was running a carb. With the fuel injection it should be easily manageable.
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Old 02-13-2019, 03:02 PM
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Re: Critique my plan for my engine

Charlie, what is the maximum lift a 113 can handle leaving a good guide seal surface on the guide ?
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Old 02-13-2019, 04:21 PM
  #13  
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Re: Critique my plan for my engine

Assuming you got all the mechanical parts right... the thing that would concern me most is how you will be tuning it?
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Old 02-13-2019, 09:06 PM
  #14  
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Re: Critique my plan for my engine

Originally Posted by Kingtal0n View Post
Assuming you got all the mechanical parts right... the thing that would concern me most is how you will be tuning it?
I think Charlie is sticking with the 90-92 tpi 1227730 speed density ecm. I tuned the hotcam for a member in California last year. It passed the sniffer this year. Not a hard cam to tune for although it took me maybe 8 tries to dial it in.
Another good cam choice
http://www.lunatipower.com/Product.aspx?id=2607&gid=346

Last edited by Tuned Performance; 02-13-2019 at 09:41 PM.
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Old 02-13-2019, 09:25 PM
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Re: Critique my plan for my engine

Its... so... old.

I mean, I know this is getting rote but. LS swap?
A stock LS engine (4.8L or 5.3 or 6.0) is cheap. The computer it comes with is modern as f. Sequential efi, trans mode switching, you can real-time it too. Turn off 1 cylinder at a time for diagnostics etc... fuel AND spark.
I know its expensive to get the motor into the car but... once you put those mounts and stuff in place, you can LS swap it all day for cheap after that. $.02
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