whats up yall........ started hearing some knocking from my LT1 so Im gonna have to pull it out and overhaul it. BUT......I decided to put in some goodies while the engine is out.

I want to build an LT1 that revs up to 7000-7500.

I need some of yalls opinions or some facts about doing this the right way. What ALL do I need to be able to rev the engine this high? pistons? rods? crank? cam? heads? I put my stroker engine together myself but it only pulls up to 6200.

Do yall think I could stroke this LT1 out to 383 and still be able to rev high? or stick to a 350 or 355 LT1?

Let me know some pros and cons on this 383 and 350.
and pros and cons about a 6000 redline engine and 7500 redline.

I still got the 6 speed tranny with 3.42's in the back, changin to 4.10s next. and I still want this set-up to be streetable. I could care less about emissions so leave that out the equation. thanx


JD

 

After you buy the $2500 PCM that can handle 7500rpm, unline the LT1 PCM which cuts out at 7000rpm, and get it programmed and fitted (another $1000 at the least), you can be ready to spend $3000 on just the valvetrain components, and about another $3000 for a billet crank.

That's why.

 

you can make a 383 rev to 7500, but youll spend tons of dough. the stock pcm goes to 7000. you will need a DFI if you want to go higher. you find them used but then again, why woudl you want to go to 7500?

 

ok forget about the PCM for now.
Im just concerned about the engine specifics right now.
like what size cam
pistons
rockers etc.?????????

the cast crank wont work? does it have to be steel?

 

OK, I'm building my engine (aside from my head/cam one in the car) to be a 381, forged internals, well ported heads, and a decent sized cam. Going for a 6250-6500rpm redline, designed for road racing. Will see many miles of highway driving, and many miles of road course action. Should put out around 450rwhp, very streetable (my definition), decent mileage, and not on the edge.

There is no real downside to this engine, sure I could go for more cubes, like a 396, but thats $1500 more, I could rev the engine another 500rpm and gain a few more mph per gear, but that equates to insane valvetrain cost, another $2000, I could go with ported AFR heads, another $3500, cost is an issue, and there are many associated cost with any project.

You will need a new rearend, and a tranny rebuild, I for one, once the car is torn down, am getting a custom gearbox done for the car, sure its $5000, but having a rock solid gearbox, with the gears I want makes it even better.

 

Maybe he's doing some stock car racing (NASCAR type).

 

Stick with the 355 if you want to rev high.

 

Ok if your asking me why a cast crank won't work @ 7500rpm and if the crankshaft has to be steel, THEN WILL A MODERATOR PLEASE PUT THIS THREAD OUT OF ITS MISERY!!!

PCM is a big concern:
Cam size is dependent on heads:
Pistons, dependent on your rods, crank, bore size, cam, heads:
Rockers, for 7500rpm, Jesel's have your name:

 

would be easier to drop in a ls1

 

haha. LS1.riiiiiiiiight

Im not looking for crazy high HP numbers. just somethin that will rev pass the usual 6000 mark like everyone has.

just some facts would be more useful

anyone have a basic recipe for this project?

I've seen engines go beyond 7000 so I know it can be done. I just dont have a clue, and came on here to see if anyone knew a little somethin. so save the smart *** remarks

 

well to rev to 7k will depend on cam and flow of the heads. if its a NA motor then get billet or forged i beam rods, light weight pistons and a light crank. get it all balanced, it will rev to the moon without problems. but your gonna have to match the heads up to the cam. get a good set of lifters, roller rockers, springs. ive seen a few locals that rev the stock short block to 7k with cc305 cams and cc306 cams. if you wanna do it safely get it all light wieght and forged.

 

Why would you even want to rev that high? Bragging rights?

 

i already asked him that

 

Can you guys help me build a motor that will rev to 19,000 rpm like the Formula One cars?

 

You can rev your stock engine to 7000 rpm (the stock LT1 is stronger than you think, just doesn't like boost ) The problem is, like people who posted before me mentioned, is to find heads that will still make power at those rpm levels. The only heads that I know will let you rev to 7000 rpm and still make power are the Dominion 32V heads (www.araoengineering.com), but those are might expensive and require a lot of customs part for them to work. Also, as previously mentioned, you will need lightweight and balanced internals + four bolt mains if you want to rev that high reliably. Good luck.