Chevy 5.0 idea

[CTX-SLPR]

Some bench racing since I don't have time to chase the wiring issues in my current car much less build an engine for another car that I don't own. With that warning out of the way, here's what I'm thinking.

For some reason I'm a big fan of the Gen II SBC despite never owning one. Maybe it's the idea that it was the last gasp of the traditional SBC with a solid engineering effort thrown at it or the fact that it spanned from the Y-body to the utilitarian B-body. In any case I had an oddball idea for a franken motor of factory parts aimed mainly at the 5.0 Fox mustang guys typical rejoiner of being barely beaten by a 350 powered car of "it's those extra 48cid, it's not a fair competion". Here's my stab at evening the displacement tables...



LT1 block with the 4.0in bore (open it up to whatever you want to fit pistons, clean up the bore, ...etc)
L99 crank with a 3.0in stroke
Either use the nearly 6.0in (5.94in) L99 rods with a stock LT1 piston or a set of true 6.0in rods and matching pistons for the rod ratio that the SBC guys are always chasing.
Basically a modern DZ302.

I can't decide if I'd run it in a 3rd or early 4th Gen F-body. Definately T-56 behind it in either case. Something that's an Auto-X/Roadcourse car that still has enough comfort to take on powertour.

What does the PT world think of it?

[Randy67]

GM did this already, the 302 actually ran pretty good. Not sure if it is worth giving up the displacement though.

[Whistler]

I remember that car. It was a red w black heritage stripes LT1 Z28 that was built by Jon Moss (I think) back when the LT1 was the hot new engine. There's no point to doing it other than if you need the smaller ci to fit a racing class, or just to nostalgically say its a 302. It will make less power and torque throughout the entire RPM range.

BTw now that the Gen 5 V8 is called LT1 again, that makes the 92-97 LT1 a ******* to describe. It's not the old or classic LT1 and not the modern LT1 (damn its 20 years old already).. What do you call it ? Boat anchor?

[andrewb70]

I remember that car. It was a red w black heritage stripes LT1 Z28 that was built by Jon Moss (I think) back when the LT1 was the hot new engine. There's no point to doing it other than if you need the smaller ci to fit a racing class, or just to nostalgically say its a 302. It will make less power and torque throughout the entire RPM range.

BTw now that the Gen 5 V8 is called LT1 again, that makes the 92-97 LT1 a ******* to describe. It's not the old or classic LT1 and not the modern LT1 (damn its 20 years old already).. What do you call it ? Boat anchor?

The new LT1 is not the Gen V engine. It is the latest and last version of the Gen IV engines.

Andrew

[Whistler]

The new Gen V LT1 is exactly that. All new, direct injected 6.2 liter powerhouse. I can't wait to tear one apart!

The new LT1 is not the Gen V engine. It is the latest and last version of the Gen IV engines.

Andrew

[WS6]

First LT no hyphen 1.


Honestly, just build a stout LT1/4 if you're wanting to use that engine. No sense in cutting out cubes just to do it.

[MonzaRacer]

LT-1/4 is older version, the new one is LT1 big difference.
As for using the L99 crank, it is a drop in, using spacer bearings and a two piece/one piece adapter and a 283 SJ crank and your rolling on a great engine. Properly tuned it shold be a screamer as well as a much more well rounded unit. As the LT-1 heads were not the greatest heads out there for the LT 5.7, tad small this was why many manufacturers made and still make heads for them and the LT-1 intake is what I am using for my 283 project, and hopefully with twin small turbos it will run hard.
My reason is a 302 is darn near impossible to blow up if properly built. Has near perfect rod to stroke ratio even with 5.7 rods, and only reason to use the 5.940 would be too use stock 350 flat top forged pistons, should leave your piston down in blueprint block with piston 0.010 down in the hole. Too zero deck depending on the deck height after squaring.
Near perfect for slapping "stock" parts together.