STROKER parts.
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,307
Likes: 1
From: Milford Haven Pembrokeshire
STROKER parts.
OK, help needed here.
Its getting near time to do my engine rebuild and while its all apart may bite the " Bullit" and get the stroker side of life sorted out.
Seems from general reading that most people go for a 383 which I am told that with a 40 rebore will end up at 390 or was it 400.
If I got it right the next step up is 406 or thereabouts ??
So whats the pros and cons of the various combinations.
Are there any particularly good or bad 383's by manufacturer or design ??
New parts in the cupboard waiting are 58cc alloy heads, torker manifold, roller rockers, faster cam, etc.
Got nothing for the bottom end so far - but the cheque book is burning a hole in my pocket...............
Its getting near time to do my engine rebuild and while its all apart may bite the " Bullit" and get the stroker side of life sorted out.
Seems from general reading that most people go for a 383 which I am told that with a 40 rebore will end up at 390 or was it 400.
If I got it right the next step up is 406 or thereabouts ??
So whats the pros and cons of the various combinations.
Are there any particularly good or bad 383's by manufacturer or design ??
New parts in the cupboard waiting are 58cc alloy heads, torker manifold, roller rockers, faster cam, etc.
Got nothing for the bottom end so far - but the cheque book is burning a hole in my pocket...............
Melting Slicks
Joined: Jan 2004
Posts: 2,672
Likes: 1
From: New Cumberland PA
Originally Posted by Ganey
350 Block 30 over 400 stroke - 383
350 Block 40 over 400 stroke - 385
The 406 is not a step up, it is different, based on the siamesed bore 400 block.
350 Block 40 over 400 stroke - 385
The 406 is not a step up, it is different, based on the siamesed bore 400 block.
I have no idea who told you that boring 40 over will get you 390 of 400 ci, but I would not believe too much from that person. Computing cubic inches for an engine is about as basic as it get. If they can't do that, they shouldn't be offering any advice.
Instructor
Joined: Aug 2000
Posts: 107
Likes: 0
From: Houston Texas
As Ganey pointed out, the 400 is a siamesed cylinder block. This can cause cooling issues, although there are plenty of folks out there with big-inch strokers based on this block with no problems. Also, the 400 is a two-bolt block from the factory. I opted for an early 4-bolt 350 block stroked to 383 cubes. Fully forged Eagle 4340 bottom end with H-beam rods and pistons with file-fit rings. 454HP/480TQ at the crank.
It really depends on what you want to do. The less expensive stuff is probably OK for the street.
Jeff
It really depends on what you want to do. The less expensive stuff is probably OK for the street.
Jeff
Drifting
Joined: Feb 2002
Posts: 1,987
Likes: 3
From: Manchester, Dead Center in the Middle of TN 25 miles to Jack Daniels,10 miles to Geo Dickle, and .8 mile from the Liquor Store at I-24 Exit 114
St. Jude Donor '05
uhhh 400 small blocks did come as four bolt mains........jim
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
They came as both 2 and 4 bolt mains. I used to have one back in the 80s. My dad got rid of it when I moved out. He gave away a 350 4 bolt a 400 4 bolt and a 454 4 bolt. Doh! 
I had no place to store them and he wanted them out!
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,307
Likes: 1
From: Milford Haven Pembrokeshire
Hold on.............lets not get this all wrong from the start.
Maybe its me mis-reading but I thought..............
1. A stroker kit is basically a new crank, rods and pistong which without a rebore will give 383 cubes.
2. If you rebore at the same time - depending on that rebore, +10, 20, 40 or whatever, then you will get 383 plus the rebore, so 400 cubes for example.
Have I got it all wrong ????????????????
Maybe its me mis-reading but I thought..............
1. A stroker kit is basically a new crank, rods and pistong which without a rebore will give 383 cubes.
2. If you rebore at the same time - depending on that rebore, +10, 20, 40 or whatever, then you will get 383 plus the rebore, so 400 cubes for example.
Have I got it all wrong ????????????????
Melting Slicks
Joined: Aug 2004
Posts: 2,165
Likes: 950
From: Keizer Oregon
No you got the right idea but for each overbore size (+10, 20, 30etc) the change in displacement is not that much....383.....385.....388....and so on. to reach 400 ci with a 350 block you would have no cylinder wall left.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,307
Likes: 1
From: Milford Haven Pembrokeshire
so how does this lot work ????????????
http://forums.corvetteforum.com/show...post1549325815
Over 400 cubes here.............
http://forums.corvetteforum.com/show...post1549325815
Over 400 cubes here.............
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,307
Likes: 1
From: Milford Haven Pembrokeshire
Melting Slicks
Joined: Aug 2004
Posts: 2,165
Likes: 950
From: Keizer Oregon
on this engine they are using a 4.00" stroke----so this is a 406 stroker bsaed on a 350 block............383 use a 3.75" stroke.........350 use a 3.48" stroke.....so the extra cubes come from stroke not bore.
2*3.14*radius of cylinder*stroke in cylinder* 8cylinders=volume (ci)
2*3.14*radius of cylinder*stroke in cylinder* 8cylinders=volume (ci)
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
A 4 inch stroke in a 350 is really pushing the limits. The 3.75 is no problem. You might have to use a small base circle cam in the 4 inch stroke. A lot of grinding is needed with a 4 inch stroke.
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,307
Likes: 1
From: Milford Haven Pembrokeshire
Ok........so I can achieve over 400 cubes with a stroker kit, using my 350 standard block.
As they used to say in the old movies - " isn't this where I came in "
And back to original questions re different manufacturers etc.
As they used to say in the old movies - " isn't this where I came in "
And back to original questions re different manufacturers etc.
Melting Slicks
Joined: Dec 2000
Posts: 2,198
Likes: 2
From: Eastern Connecticut
Originally Posted by oregonsharkman
2*3.14*radius of cylinder*stroke in cylinder* 8cylinders=volume (ci)
Racer
Joined: Jan 2004
Posts: 377
Likes: 1
From: Anchorage Alaska
Originally Posted by Ganey
350 Block 30 over 400 stroke - 383
350 Block 40 over 400 stroke - 385
The 406 is not a step up, it is different, based on the siamesed bore 400 block.
350 Block 40 over 400 stroke - 385
The 406 is not a step up, it is different, based on the siamesed bore 400 block.
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
That's not what oregonsharkman said.
If you look at what oregonsharkman said, he simply stated the stroke,
which I did not put in.
I almost put it in originally like this:
350 Block 30 over 400 stroke (3.75) - 383
So that's still correct.
Duntov determined that 3.75 was the longest stroke the SB was happy w/ for racing.
The early 400 blocks were 4 bolt because they were originally intended to be high perf. engines.
Originally Posted by oregonsharkman
...........383 use a 3.75" stroke.........350 use a 3.48" stroke.....so the extra cubes come from stroke not bore.
cheers:
cheers:
which I did not put in.
I almost put it in originally like this:
350 Block 30 over 400 stroke (3.75) - 383
So that's still correct.
Duntov determined that 3.75 was the longest stroke the SB was happy w/ for racing.
The early 400 blocks were 4 bolt because they were originally intended to be high perf. engines.
Melting Slicks
Joined: Aug 2004
Posts: 2,165
Likes: 950
From: Keizer Oregon
Originally Posted by joe73vette
That should be 3.14*radius squared*stroke*8 cylinders. I know that is what you meant, but wanted to keep from confusing people. Joe
So that what I did wrong on my trig final
