DIY 450-500rwhp?

[cuisinartvette]

Recieved a half serious offer on the 67 today..As you guys know one of these cars has to go..:(

If I got to keep the Z instead of the other I dont think Id be happy with it with just a top end port job, headers, etc.I could be wrong thouhg...Just doesnt seem like enough.. Being as I do my own work, porting, whats the best bang for the buck to get to the power goal Id want. Im not sending it to some overpriced (albeit good, Im sure) tuner, Id be buying my own crank, rods, etc and getting my machine work done locally.

I still have to somehow squeak past smog which shouldnt be a problem unless I get stupid with cams. Is this realistic? I love the shape and the handling of the Z but 345rwhp is boring me to tears.

Thoughts?

[bradslt5]

ron ,i really think that you would be happy with a fully ported 350 .heads inj and plenum. pete, has that pkg and makes between 450 -460 wrhp on stk cams.and you would fly by the smog nazis .give him a shout maybe he can guide you .. petes best time at the strip to date i believe is 11.33@ 124+ mph. that will make the pampers wet :mrgreen:

[Aurora40]

I'm still curious to hear more about the liners used in Frank's build. It seems like instead of a stock-cranked 368, you could have something more like a stock-cranked 390. Seems like that might make the bang for the buck a little better for non-strokers, but perhaps it doesn't work like that.

[cuisinartvette]

Might be interested in the 390 Idea, stock crank turned down, right?

I like high revving motors but want a little more torque on this one.

[XfireZ51]

How about the STS Turbos?

[Aurora40]

Might be interested in the 390 Idea, stock crank turned down, right?

I like high revving motors but want a little more torque on this one.
Erm, I've no idea. Frank had Marc build him that 440 that we are all waiting to hear more about. I just did the math based on the liner size and the stock stroke. I've no idea how feasible it is, but it would be neat if it were as easy/cheap as a 368 (not that they are cheap).

[cuisinartvette]

I wouldnt mind TTs a bit, but never could afford it. If this came to pass I might have 5k to play with. Between that and the sale of one motor I should be able to come up with something acceptable I would hope.

[bradslt5]

couldnt one offset grind the crank and get to 390? i am not that knowledgeable on this , but have an offset ground crank in my 68 mustang that brings it to 383.I know its a ford but had it before i found out about the zr1 so be easy on me . ron will call you tonight deb had 2 tough days . she is out of the woods now, it was a little scary for a while though, phew

[A1990]

Erm, I've no idea. Frank had Marc build him that 440 that we are all waiting to hear more about. I just did the math based on the liner size and the stock stroke. I've no idea how feasible it is, but it would be neat if it were as easy/cheap as a 368 (not that they are cheap).
I think Bob is referring to 4.125 on the bore with 3.66 (stock) stroke. if you turn the crank with that bore you end up with 402 instead.

Frank's is 4.125 x 4.125

[bradslt5]

wow a 402 without having to buy a 5k crank . very cool indeed

[Aurora40]

I think Bob is referring to 4.125 on the bore with 3.66 (stock) stroke.
Yeah, that's what I meant. Just crunching the numbers = 391ci. :cheers:

[Locobob]

Headers, exhaust, and a ported intake really make a big difference. It's not just peak power it's the way the above mods extend the powerband clear to redline and beyond. Might be enough performance to keep you smiling for quite a while Ron. I wouldn't bother with the cams unless you are going the stroker route, cost - benefit doesn't add up. My 368 has stock cams and at 480rwhp it certainly isn't hurting in the power department.

[HAWAIIZR-1]

I thought that LT5s are expensive to get into the bottom half and even the heads so wouldn't the TT from Raptor be a good option when it is all said and done? I'm doing the basics first with headers/gear/port, etc. and if not satisfied, I want to consider the TT. From what I have seen it might be cheaper to get the same HP/torque for the $. I guess I think I can do the TTs myself, but the other mods to bottom half I might not be able to DIY.

[cuisinartvette]

Machine work/liners
Rods/pistons arent bad depending on brand.
Crank could cost.

Im my case I have gaskets, seals, do assembly and porting myself so the bang for buck factor is there. Not saying I will need them but I can get the cams reground and hardened pretty reasonable locally.

Unless I had to buy a crank vs turning this one down it could add up but Im guessing this could be done for 5k or close to it using stock croke or turning this crank down... With headers and injectors/tune maybe a little more.

Am I on track here or am I in never never land ?

TT makes the most sense to a point but out of my league completely $$ wise.

[blackjack]

same here..i already have 4 inch piston kit to build a 368..all i need now is a sleeve kit,and some patience...problem is,nobody has ever worked in an lt5 in my area,and im afraid itll be a never ending project,plus i feel its a waste of time if i dont port the heads at the same time....decisions,decisoins.....
bj
91/1735
4:10 gears
proted plenum/ih
lucas injectors
fidanza
ssw headers soon
hurst

[HAWAIIZR-1]

Machine work/liners
Rods/pistons arent bad depending on brand.
Crank could cost.

Im my case I have gaskets, seals, do assembly and porting myself so the bang for buck factor is there. Not saying I will need them but I can get the cams reground and hardened pretty reasonable locally.

Unless I had to buy a crank vs turning this one down it could add up but Im guessing this could be done for 5k or close to it using stock croke or turning this crank down... With headers and injectors/tune maybe a little more.

Am I on track here or am I in never never land ?

TT makes the most sense to a point but out of my league completely $$ wise.

I'm probably the one in la la land and I don't even know what the TT will cost. I guess I thought the internal mods are big bucks and I think it is above my capabilities without the special tool and in my garage. Back in the day I would not hesitate to pull a SBC or BBC to rebuild, but I don't know that I can do it anymore and still afraid of going internal with the LT5 unless I have too. I can feasible think of shipping my motor anywhere with the cost from Hawaii, even to Jeff on the West Coast would be out of reach. My cousin works for FEDEX and can maybe get me one way freight at his cost, but I guess you folks are much more mechanically inclined to do the DIY builds and that is great. :worship:

I don't even know why a few years ago I bought some pistons, but I have to sell them one day since I don't know that I will ever use these stock bore units.