stroker question
Thread Starter
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
stroker question
i had a question concerning 396 stroker motors. i friend of mine said that just stroking a 350 block would make 383 and a bore and stroke would make a 386. what exactly are you guys doing to get 396? boring a hell of a lot more out? putting a much larger crank in there or what? im not quite sure i understand all the details a little info would be greatly appreciated
Team Owner
Joined: Sep 2001
Posts: 62,137
Likes: 1,727
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: stroker question (1996man)
A 383 is a 350 (usually) thats been bored out .030 to 4.030 and is using a 400 crank (3.75 stroke)
I dont remember off hand what bore the 396 is, but i think it uses the 3.75 crank. :confused:
I dont remember off hand what bore the 396 is, but i think it uses the 3.75 crank. :confused:
Burning Brakes
Joined: Dec 2000
Posts: 1,023
Likes: 0
From: Marietta, South Carolina, USA
Re: stroker question (1996man)
Caboboy is right it is a 350 bored 0.030 over and it had a carnk with a little more stroke then a 400 crank (400 crank 3.75 the other 3.875) you have to clear the block for both and yes a little more for the 3.875 but it is not to much.
Jay
Jay
Safety Car
Joined: Feb 2000
Posts: 4,564
Likes: 109
From: Austin Texas
Re: stroker question (Vette92)
Yup.
4.030 bore, 3.750" crank stroke = 383
4.030 bore, 3.875" crank stroke = 396
4.030 bore, 4" crank stroke = 409
4.030 bore, 3.750" crank stroke = 383
4.030 bore, 3.875" crank stroke = 396
4.030 bore, 4" crank stroke = 409
4.125 bore, 4" crank stroke = 427 :D My new motor.....
Safety Car
Joined: Feb 2000
Posts: 4,564
Likes: 109
From: Austin Texas
Re: stroker question (Vette92)
Should be a nice motor when you're done with it though Joe.
We used a "standard" block for it...just happens to be a Bow-Tie block is all :D
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Instructor
Joined: Jun 2002
Posts: 231
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From: 80/680 junction Ca.
Re: stroker question (Joe90)
You have to be careful with the rod bolt to cam lobe clearance in a long stroke motor like that. Roller cams can and usually run a smaller base circle than flat tappet profiles and that makes it more compatible with that combo, but you need to take it into consideration when building one.
Le Mans Master
Joined: Mar 2002
Posts: 5,889
Likes: 2
From: Castro Valley Calif.
St. Jude Donor '03 thru '26
Re: stroker question (Joe90)
Yup.
4.030 bore, 3.750" crank stroke = 383
4.030 bore, 3.875" crank stroke = 396
4.030 bore, 4" crank stroke = 409Missed one....
4.125 bore, 4" crank stroke = 427 :D My new motor.....
4.030 bore, 3.750" crank stroke = 383
4.030 bore, 3.875" crank stroke = 396
4.030 bore, 4" crank stroke = 409Missed one....
4.125 bore, 4" crank stroke = 427 :D My new motor.....
Joe, I don't mean to intrude too much on this post, but how far along are you on your block? What are you using for a rotating assembly? IM or EM me if you would please. I'm ALWAYS interested in talking 400 block stuff. :cool:
Safety Car
Joined: Feb 2000
Posts: 4,564
Likes: 109
From: Austin Texas
Re: stroker question (Maximus9000)
This isn't the builders first rodeo...
He has already built this exact combination with a carb, and heads flowing about 50 CFM less than mine. It's in a Camaro around town and cranked out 760 HP & 680 lb/ft on the engine dyno. It has been raced extensively and has been in the car for almost 2 years now.
The small base-circle cam is the way we have to go. Tolerances are tight, but we'll get there. Thanks for the warning, but we already talked all that through. We'll go with shaft-mounted rockers in a 1.7 or 1.8 ratio to get the valve lift needed to feed this thing air. With that ratio we can go with a smaller grind on the cam...it's all going to be solid-roller.
He has already built this exact combination with a carb, and heads flowing about 50 CFM less than mine. It's in a Camaro around town and cranked out 760 HP & 680 lb/ft on the engine dyno. It has been raced extensively and has been in the car for almost 2 years now.
The small base-circle cam is the way we have to go. Tolerances are tight, but we'll get there. Thanks for the warning, but we already talked all that through. We'll go with shaft-mounted rockers in a 1.7 or 1.8 ratio to get the valve lift needed to feed this thing air. With that ratio we can go with a smaller grind on the cam...it's all going to be solid-roller.
Pro
Joined: Aug 2002
Posts: 702
Likes: 1
From: the corner of walk and dont walk
Re: stroker question (Caboboy)
Yup.
4.030 bore, 3.750" crank stroke = 383
4.030 bore, 3.875" crank stroke = 396
4.030 bore, 4" crank stroke = 409Missed one....
4.125 bore, 4" crank stroke = 427 :D My new motor.....
or........... a 4.155/3.875= 420 which is MY new motor :D
I'm ALWAYS interested in talking 400 block stuff. :cool:
4.030 bore, 3.750" crank stroke = 383
4.030 bore, 3.875" crank stroke = 396
4.030 bore, 4" crank stroke = 409Missed one....
4.125 bore, 4" crank stroke = 427 :D My new motor.....
or........... a 4.155/3.875= 420 which is MY new motor :D
I'm ALWAYS interested in talking 400 block stuff. :cool: