So...How much does it cost to build a 380 cube ZR1?
 

I was just wondering what it would cost to build a 380 cube LT5(stock LT-5 block with 4" sleeves & stock crank offset ground to 3.7??"). I guess this is our "383" of the LT-5 world. Too bad it took this long to figure it out! I guess we would have 350's with topend jobs & probably no 368's or 385's, then the super mega-strokers. I also think that if rebuilding, more aggressive cams are a lot more reasonably installed. And, I wonder what the torque numbers would look like. Also, any downsides to this combo? Thanks, Tim

Re: So...How much does it cost to build a 380 cube ZR1?
 

Here is one example. Take your pick.

http://zr1specialist.com/HAT%20Web/p...20upgrades.htm

Re: So...How much does it cost to build a 380 cube ZR1?
 

No downside and about 10K

This included Petes intake cams and porting on the heads.

Re: So...How much does it cost to build a 380 cube ZR1?
 

DIY for probably 3-4K

probably closer to 4 with the liner cost

Re: So...How much does it cost to build a 380 cube ZR1?
 

price out what you "think" it will cost and double it (ask me how I know)

seriously, I think you are looking at a bit more than 10k, but these guys probably have cheaper and more current sources than I do.

contact pete and marc haibeck and they'll tell you "it depends on what the car needs" and they won't typically know until they get it apart

soooo.... to answer your question

keeping the stock rods? stock cams? I'd run pete's intake and stock exh.

porting the heads (you better) CNC or hand port???

have the headers, exh, blah blah, that you need to make all of it work

it adds up real quick

price out all the parts you need, labor, and options you want

if you can do it for 4k, sign me up for 3 of them!!!

Re: So...How much does it cost to build a 380 cube ZR1?
 

When my 5.7L had Pete's intake cams, I really thought it was a very sweet motor. Very smooth. And it was. I was concerned about adding the exhaust cam being too much, too lumpy, too raucous.
NOW, it is just perfect IMO. So tractable, so driveable. It does exactly what you want it to do and when. It would be difficult to go back. And so if I were to go to a larger displacement LT-5, I couldn't imagine spending the money without doing the cams. If anything, the larger displacement NEEDS the bigger cams to take full advantage of the additional cubes.

Re: So...How much does it cost to build a 380 cube ZR1?
 

Wouldn't you have to change rods????? Isn't this how your gaining the cubes.....by offset grinding the crank & using small SBC rod journals.

I think I would go with something like Oliver or Manley.

And cams, wouldn't it be a waste to not go bigger @ $1800 for both Intake & Exhaust? I know you would have to buy new tappets.....how much are they? But the cost to install while the engine is out has got to be a lot more cost effective.

Re: So...How much does it cost to build a 380 cube ZR1?
 

I believe stock rods work.....need liners and pistons...cams come up now and again. I have a few extra sets of my own I got cheap....

Re: So...How much does it cost to build a 380 cube ZR1?
 

If your doing an offset grind on the crank you have to go longer rods, don't you?
Rich

Re: So...How much does it cost to build a 380 cube ZR1?
 

Not necessarily......you have to go to smaller connecting rod big end diameter. This is where you gain your throw to increase the stroke. You basically "relocate" the centerline of the rod to further out on the crank. The smaller diameter rod journal lets you do this.