View Poll Results: Which would be a better bang for the buck both built out of a 6.0 iron block?
Voters: 49. You may not vote on this poll
info on which to build 370 or 408
No doubt the 408 will bring a little more money if I was to sell the car. The build cost from a 370 to a 408 is about $1,200.00 so I do not have problem spending the money to build the 408.
If my heads will not work with the 408 then I will have to get heads therefor I will have about $3,500.00 more into this build than if I was to just go with the 370 and use my heads.
BTW, I would rather have the 408 if it will work with what I have.
Correct me if I'm wrong, but I'd think the bigger bore + longer stroke (408cid) would rev slower than the shorter stroke (370cid)...
Also, someone mentioned if your not going FI, go smaller cid...I'd think it would be the other way around. If you don't want FI, go bigger cid.
Sounds like your leaning towards the 370cid, either way good luck. Personally, I'd go bigger cid, as you can tell by my sig.
Also, someone mentioned if your not going FI, go smaller cid...I'd think it would be the other way around. If you don't want FI, go bigger cid.
Sounds like your leaning towards the 370cid, either way good luck. Personally, I'd go bigger cid, as you can tell by my sig.
Your heads will work fine with a 408cid. They are not "ideal", but you'll only be leaving some HP on the table. I'm putting my ported patriot LS6 heads on my build. I know with expensive heads I'd get more power, but I don't want to spend another few G's just for that.
Go bigger CID
Go bigger CID
TECH Regular
Joined: Jan 2008
Posts: 458
Likes: 0
From: Bellaire, TX
How do you figure? Adding the little extra stroke also adds weight and slows down the rate of rotation. Yes is adds cubic inches which will create the ability to move more air; but it too comes with a cost. We are talking about 38 cid. At 1hp per cubic inch that’s 38hp, I agree… THERE IS NO REPLACEMENT FOR DISPLACEMENT but HORSEPOWER… the difference between the 370 and 408 is $800. Besides the shorter stroked motor will get to the peak Horsepower quicker, there are Pros and Cons to every build and the 408 is a great build…for a forced induction build. The 370 is a better build for a Naturally Aspirated build. The rod length to stroke ratio is better suited for a N/A or nitrous build. TECH Regular
Joined: Jan 2008
Posts: 458
Likes: 0
From: Bellaire, TX
I made money off that car when sold, I bought it cheap...
No doubt the 408 will bring a little more money if I was to sell the car. The build cost from a 370 to a 408 is about $1,200.00 so I do not have problem spending the money to build the 408.
If my heads will not work with the 408 then I will have to get heads therefor I will have about $3,500.00 more into this build than if I was to just go with the 370 and use my heads.
BTW, I would rather have the 408 if it will work with what I have.
No doubt the 408 will bring a little more money if I was to sell the car. The build cost from a 370 to a 408 is about $1,200.00 so I do not have problem spending the money to build the 408.
If my heads will not work with the 408 then I will have to get heads therefor I will have about $3,500.00 more into this build than if I was to just go with the 370 and use my heads.
BTW, I would rather have the 408 if it will work with what I have.
TECH Regular
Joined: Jan 2008
Posts: 458
Likes: 0
From: Bellaire, TX
Correct me if I'm wrong, but I'd think the bigger bore + longer stroke (408cid) would rev slower than the shorter stroke (370cid)...
Also, someone mentioned if your not going FI, go smaller cid...I'd think it would be the other way around. If you don't want FI, go bigger cid.
Sounds like your leaning towards the 370cid, either way good luck. Personally, I'd go bigger cid, as you can tell by my sig.
Also, someone mentioned if your not going FI, go smaller cid...I'd think it would be the other way around. If you don't want FI, go bigger cid.
Sounds like your leaning towards the 370cid, either way good luck. Personally, I'd go bigger cid, as you can tell by my sig.
Like in your SIG you went with a 416 cid (LS3 I would assume???) why not go up to a 427cid?
How do you figure? Adding the little extra stroke also adds weight and slows down the rate of rotation. Yes is adds cubic inches which will create the ability to move more air; but it too comes with a cost. We are talking about 38 cid. At 1hp per cubic inch that’s 38hp, I agree… THERE IS NO REPLACEMENT FOR DISPLACEMENT but HORSEPOWER… the difference between the 370 and 408 is $800. Besides the shorter stroked motor will get to the peak Horsepower quicker, there are Pros and Cons to every build and the 408 is a great build…for a forced induction build. The 370 is a better build for a Naturally Aspirated build. The rod length to stroke ratio is better suited for a N/A or nitrous build. TECH Regular
Joined: Jan 2008
Posts: 458
Likes: 0
From: Bellaire, TX
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
I voted 408. If your gonna spray it, it want really matter if the heads are "optimal". And if you are going to by some heads, get some ported L92's that flow 360cfm for 1200.00! Have a LS3 intake ported and pick up a 90mm PTM throttle body then your done.
I would be supprised if the 408 made 10 or 15 more horse power with the same heads. It might make 20 more foot lbs of torque but that will be it. If hes going to be puting gas on it just up the shot a tiny bit and make up that difference and save the $1200 for some suspension you will be needed either way or a hell of a down payment on a 12 bolt. Either way you only talking about probably less than a tenth of a second in the 1/4 mile.
If you spent money to up grade heads either one of the 370 or the 408 will benifit from the head up grade.
My bad, if he already has the fast 90 setup then it looks like he could have a really nicely setup 370ci n/a and like you said just hit it with a little extra N20.
So is this going to be a 370 iron block setup?
As far as HP difference, his 370 will be close to optimal so I don't see it being much rwhp (15-20) difference than a 408 that he would put together with the same parts. The 408 would probley still have some extra low end grunt but we are talking about a stalled A4 car not a M6 so that really dosn't come into play in my book.
So is this going to be a 370 iron block setup?
As far as HP difference, his 370 will be close to optimal so I don't see it being much rwhp (15-20) difference than a 408 that he would put together with the same parts. The 408 would probley still have some extra low end grunt but we are talking about a stalled A4 car not a M6 so that really dosn't come into play in my book.
My bad, if he already has the fast 90 setup then it looks like he could have a really nicely setup 370ci n/a and like you said just hit it with a little extra N20.
So is this going to be a 370 iron block setup?
As far as HP difference, his 370 will be close to optimal so I don't see it being much rwhp (15-20) difference than a 408 that he would put together with the same parts. The 408 would probley still have some extra low end grunt but we are talking about a stalled A4 car not a M6 so that really dosn't come into play in my book.
So is this going to be a 370 iron block setup?
As far as HP difference, his 370 will be close to optimal so I don't see it being much rwhp (15-20) difference than a 408 that he would put together with the same parts. The 408 would probley still have some extra low end grunt but we are talking about a stalled A4 car not a M6 so that really dosn't come into play in my book.
