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#1 |
Registered User
Join Date: Aug 2006
Location: Panama City, FL
Posts: 34
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Does anyone know what the approximate cid of a 350 boared 60 over? Just wandering, got a call today form the guy that is working on my block. He said that it was allready 40 over but that it was not even so I said punch it out to 60 over!! Also what would I need to do to make her a 383 stroker? I have to get a crank anyway my stock one was shot. Keep in mind that I would like to keep the price down by using the stock connecting rods. So if there is any one who needs a set of bran new std size pistons let me know they are made by Sealed Power. Thanks guys
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#2 |
Active Member
Join Date: Oct 2006
Location: wi
Posts: 190
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Re: 0.060 Over
dont use the stock rods, youll regret it later
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#3 |
Senior Member
Join Date: Jan 2005
Location: SUNNY WARM BIKE RIDING COTTONWOOD ARIZONA
Posts: 2,097
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Re: 0.060 Over
supposedly every .030 = 5ci
youll need a 400 crank in your 350. they make 383 kits all day long with everything you need. just use your search button and look up "383 crank kits" and youll find lots of options. |
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#4 |
Senior Member
Join Date: Jul 2006
Location: Blountville, Tn.
Posts: 3,904
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Re: 0.060 Over
Every .030 over bore adds 5 c.i.'s So you will have a 360 ci. In order to make a stroker. you need a 400 crank, 350 rods. And special stroker pistons. 400 harmonic balancer and flywheel. Or you could buy a stroker kit from summit it has everything you need. You will also have to have the inside of the block clearanced for the stroker crank and such.After you get everthing clearanced , you will need to have the assembly balanced. There is quite a bit of machine work to be done to make a stroker motor, but it is well worth the effort.
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#5 |
Active Member
Join Date: Oct 2006
Location: wi
Posts: 190
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Re: 0.060 Over
i was goning to do the 400 crank in the 350 but they wanted about 1500 just for the maching that needed to be done. so i just went with the 400.... very happy with it.
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#6 |
Sisyphus was my mentor!
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Location: Carleton Place, Ontario CANADA
Posts: 984
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Re: 0.060 Over
My 327 bored 60 over = 336cui
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passthebuck ![]() #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car |
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#7 | |
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Join Date: Apr 2006
Location: Osawatomie,KS
Posts: 119
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Re: 0.060 Over
Quote:
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#8 |
Registered User
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Location: Philly
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Re: 0.060 Over
I might be wrong here but I thought a 383 used a 350 block bored .030 (355CID). If you bore your block out to .060, you're not going to wind up with a 383. You'd have a 388...I think.
Last edited by Ole Blue 68; 10-19-2006 at 09:27 PM. |
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#9 |
PROJECT 7DEUCE
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Location: GRANTS PASS OR
Posts: 21,608
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Re: 0.060 Over
P.A.W. sells a great kit for the stroker set-up..
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GO BIG GREEN ![]() MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P.. |
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#10 |
CAN'T FIX NOTHIN
Join Date: Sep 2006
Location: SOUTHRUST VIRGINIA !!!
Posts: 2,112
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Re: 0.060 Over
stock 327 = 4'' bore 3.250'' stroke
stock 350 = 4'' bore 3.5'' stroke stock 302 = 4'' bore 3'' stroke stock 400 = 4.250 bore 3.750 stroke stroker 350 block 4'' bore 400 3.750 crank = 383 stroker 400 block 4.250 bore 350 crank 3.5'' = 372 isn't the interchangeability of the now non existant general motors part's wonderfull !! ![]() |
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#11 |
Next project: 1970 K10
Join Date: Feb 2004
Location: Fort Collins, Colo 80524
Posts: 6,685
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Re: 0.060 Over
Bore x Bore x .7854 x Stroke x Number of Cylinders = Cubic Inch Displacement
Stock 350 = 4.000" bore, 3.48" stroke Stock 400 = 4.125" bore, 3.75" stroke Stock 350 = 4.000 x 4.000 x .7854 x 3.48 x 8 = 349.84857 cid .030" over 355 = 4.030 x 4.030 x .7854 x 3.48 x 8 = 355.11597 cid .060" over 360 = 4.060 x 4.060 x .7854 x 3.48 x 8 = 360.42274 cid 383 = 4.030 x 4.030 x .7854 x 3.75 x 8 = 382.66808 (350 block .030 over, 400 crank) 388 = 4.060 x 4.060 x .7854 x 3.75 x 8 = 388.38656 (350 block .060 over, 400 crank) 377 = 4.155 x 4.155 x .7854 x 3.48 x 8 = 377.48715 (400 block .030 over, 350 crank) 383 = 4.185 x 4.185 x .7854 x 3.48 x 8 = 382.95791 (400 block .060 over, 350 crank) The most common 383 is a 350 block, .030" over with a 400 crank that has the mains turned down. It can be done with a .060" over 400 block and 350 crank with oversized bearings, but the 350 block is the best way to go. That, and I wouldn't take a 400 to .060" over, cylinders are too thin and overheating can be a problem. *** I've had to correct my math a few times, so if you thought I was stoned, just refresh the page ![]()
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Bob 1970 Chevy K10 LWB "Goldie" 350/TH350 next project!! 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE Last edited by glock35ipsc; 10-19-2006 at 10:36 PM. |
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#12 |
Registered User
Join Date: Aug 2006
Location: Panama City, FL
Posts: 34
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Re: 0.060 Over
Well guys thanks for the info it has helped! Now if I want to run a 3.75" stroke crank will I have to do something to the block? which is better 5.7" or 6" rods? Is it better to go internaly balanced or externaly balanced?
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#13 |
Next project: 1970 K10
Join Date: Feb 2004
Location: Fort Collins, Colo 80524
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Re: 0.060 Over
The block will have to be releived for the 400 crank to clear the block in a few areas, near the pan gasket surface and some cylinder bottoms. If it is a street motor, 5.7" rods will do just fine. If you are going to put it on the track too, then look at 6" rods cause the 6" rods usually will set the wrist pin in the oil ring. Just be sure the pistons are correct for the rod length!!
I would go internal balance. And use a Scat crank! Bomb proof!
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Bob 1970 Chevy K10 LWB "Goldie" 350/TH350 next project!! 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE Last edited by glock35ipsc; 10-19-2006 at 10:44 PM. |
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#14 |
Active Member
Join Date: Oct 2006
Location: wi
Posts: 190
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Re: 0.060 Over
both ballanced works best
think about it... its a rotating mass, if it is all ballanced, it will be the best in the end |
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#15 |
Next project: 1970 K10
Join Date: Feb 2004
Location: Fort Collins, Colo 80524
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Re: 0.060 Over
Stock 400's are externally balanced. All other SBC are internally balanced.
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Bob 1970 Chevy K10 LWB "Goldie" 350/TH350 next project!! 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE |
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#16 |
Account Suspended
Join Date: Oct 2004
Posts: 1,276
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Re: 0.060 Over
Don't bother mocheeenin that 400 crank, just buy a 383 crank. If they told you 1500, then think about the whole picture. Was it cast or forged crank and pistons?? Bore and line hone hone mains??? Deck Bore and hone for oversize pistons, balance the whole schmear and grind for clearance measure this and that assemble diss-assemble and do it over again, make sure it doesn't smack the cam . the block, the pan new hardware, balancer clean it oil it and on and on and on and on......
1500 for the bottom end ain't too bad!! Mine cost 3 gs and I got everything from the shop except my bare heads!!! They did it all so I put the other 1500 into all of the assembly and parts etc. to put oversize valves in and a full roller valve train 1500 is a good price for a 383 bottom end. |
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#17 |
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Location: SOMERSET KY.
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Re: 0.060 Over
I AGREE.. THAT IS ALOT OF HOURS OF LABOR. IT DOESN'T TAKE LONG TO ADD UP TO $1500.
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#18 |
'69 Step
Join Date: Mar 2005
Location: Marion, Texas
Posts: 722
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Re: 0.060 Over
Not to steal the thread but I had two relevant questions? I had a 350 bored one time and the guy told me NOT to go .60 over because it makes the walls too thin? He said go no more than .30. Is that B.S.? Secondly, What is the big deal with a stroker motor?
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#19 | |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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Re: 0.060 Over
Quote:
If you are just going to drive your truck around like a truck you can use a stock 400 crank and stock 350 rods. Have a competent machine shop go over both. They sell pistons with the wrist pin higher up in the piston to work with a stock 400 crank and stock 350 rods. If you want a crazy fast, blown, NOS, or some other wild application, look for something stronger (aftermarket) for the bottom end of the engine. I have 2 years and 2000 miles on my 383. I built it with a 1971 Monte Carlo 2-bolt 350, bored .030 over. The 400 crank was on the machine shop guy's shelf. The rods were out of the 71 Monte. I expect to get 100,000 miles out of this engine. At the rate I'm going it will last 98 more years. If you are at the point in your truck's restoration that you need to rebuild that tired old 350, and you don't need a big block, the 383 is the ONLY way to go.
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#20 |
Next project: 1970 K10
Join Date: Feb 2004
Location: Fort Collins, Colo 80524
Posts: 6,685
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Re: 0.060 Over
.060" over on a 350 is acceptable, but the cylinder walls of a 400 are much thinner due to the larger bore (4.000" for a 350 -vs- 4.125" for a 400). I have built many, many .060" over 350 street motors without any overheating problems. I have also screwed together a couple .060" 400's with no problems, but I would stay away from going that big on a 400 if at all possible.
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Bob 1970 Chevy K10 LWB "Goldie" 350/TH350 next project!! 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE |
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#21 |
Account Suspended
Join Date: Oct 2004
Posts: 1,276
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Re: 0.060 Over
Don't mess around with the 400 crank since it has to be resized (machine work$$$$$$!!!!!) and you can buy a 383 crank for much less.
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#22 |
Account Suspended
Join Date: Oct 2004
Posts: 1,276
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Re: 0.060 Over
The big deal with strokers........................................:::::::::::::: Stroker=Stump Puller!!!!!!
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#23 |
Next project: 1970 K10
Join Date: Feb 2004
Location: Fort Collins, Colo 80524
Posts: 6,685
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Re: 0.060 Over
Hmmm, I guess it depends on the machine shop. Mine never charged any different for turning down the 400 mains to fit the 350 block, as he would charge for turning any other crank. Same price to machine the journals no matter how much was removed......
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Bob 1970 Chevy K10 LWB "Goldie" 350/TH350 next project!! 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE |
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#24 |
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Re: 0.060 Over
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junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. ![]() LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST |
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#25 |
Registered User
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Location: Philly
Posts: 1,140
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Re: 0.060 Over
I think the machinist was giving you good advice. Suppose you had to have the block machined again? You'd still have room to work with a .030 while a .060 wouldn't leave you much at all and you'd probably be shopping for a new block.
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