crank size?
Thread Starter
Joined: Oct 2005
Posts: 4,768
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From: Central Valley
crank size? What companies would anyone suggest to talk to for a custom stroke size? looking at a 3.937 maybe
Last edited by King Nothing; Jan 18, 2013 at 09:26 PM.
Thread Starter
Joined: Oct 2005
Posts: 4,768
Likes: 26
From: Central Valley
ok i called Callies and they said no problem 
btw thank you TSP for tryin to discourage me from my inquiry, most likely i'll pass on buyin parts from you
btw thank you TSP for tryin to discourage me from my inquiry, most likely i'll pass on buyin parts from you Last edited by King Nothing; Jan 18, 2013 at 09:26 PM.
So I'll bite... Why would you want to run through the additional cost/grief of running a custom combo, that is relatively insignificant from a displacement perspective? Do you have a deck that was cut .030 too much, or are you trying to get to a specific displacement for a given class of competition? I don't have a dog in this fight either way, but I would say that any one advising you to do this isn't really giving you sound advice. If you have an oddball crank, you are probably going to always require either oddball pistons and or rods for a rebuild or replacement. If you are dead set on doing this, I would suggest looking for used 4" crank, maybe with a wiped rod journal for cheap and have a reputable crank grinder put the stroke you want on it, with 2" rod journals.
Thread Starter
Joined: Oct 2005
Posts: 4,768
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From: Central Valley
Going for a specific CI and I'm making the car into what I personally want since it is a roller and will need an engine, trans and rear end. Why oddball pistons? I'm changing the stroke not the bore and what's the problem with custom rods if needed? I want a forged crank not an iron crank so no used parts in my engine
Because if you alter the stroke, and do not increase/decrease the rod length and or compression height of the pistons will be either up or down in the hole. In your specific example, assuming a 0 deck height with a 4" crank, the same pistons and rods on your 3.93 crank will end up .031 down in the hole. Most times folks would have custom pistons made with a different compression height made (move the wrist pin up or down relative to the top of the piston), but there are inherent issues with doing that. So now you've spent all this money on a custom crank and now custom pistons or rods. Have you priced a custom set of pistons or rods lately? What happens in two years when you go to freshen it up, or worse you burn up a piston, every time you go to do something you have to order custom oddball stuff that has long lead times to manufacture. This hobby can be frustrating enough without making your own boulder to push up hill.
Thread Starter
Joined: Oct 2005
Posts: 4,768
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From: Central Valley
I'm sorry I was thinking you were meaning bore not the dish itself, yes I already know a custom piston will need to be bought also and I was talking with Don at Callie's about the crankshaft and custom rods and we decided when it gets closer we'll decided who to go through for pistons then that'll be the next door to open. To answer your question, yes I've talked about pricing on everything except pistons and I'm not shocked at all so far
Well my personal opinion is that you can make all the horsepower you could ever want with off the shelf parts, thus leaving you more money to spend on other parts of the project. Hell have you seen what guys do with 100k mile truck engines these days? Anyhow, your car, your dream, good luck with it.
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Thread Starter
Joined: Oct 2005
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From: Central Valley
Well my personal opinion is that you can make all the horsepower you could ever want with off the shelf parts, thus leaving you more money to spend on other parts of the project. Hell have you seen what guys do with 100k mile truck engines these days? Anyhow, your car, your dream, good luck with it.
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You're going after a true 396 aren't you?
If that's the case, why don't you use a 4.020 bore and a 3.900 crank? They are all shelf parts and won't cost you as much as custom stuff.
If that's the case, why don't you use a 4.020 bore and a 3.900 crank? They are all shelf parts and won't cost you as much as custom stuff.
Launching!
Joined: Jan 2011
Posts: 274
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From: Collierville, TN
I understand that desire to have something a little different. I've been kicking that around myself.
I'd like to build a 400.
3.825" Stroke
The bore would be 4.080.
The crank is an off the shelf piece but the pistons... not so much. I was kicking around asking Texas Speed their thoughts......
This motor will have a 2.9L Whipple on top.
My thinking was that I could get a little more piston to handle the boost, as well as, some uniqueness combined with a motor size that brings back a few memories.
Sorry about the thread jack.....
Build whatever makes you happy.
I'd like to build a 400.
3.825" Stroke
The bore would be 4.080.
The crank is an off the shelf piece but the pistons... not so much. I was kicking around asking Texas Speed their thoughts......
This motor will have a 2.9L Whipple on top.
My thinking was that I could get a little more piston to handle the boost, as well as, some uniqueness combined with a motor size that brings back a few memories.
Sorry about the thread jack.....
Build whatever makes you happy.
Last edited by FLYZNTN; Jan 20, 2013 at 09:29 AM.
Thread Starter
Joined: Oct 2005
Posts: 4,768
Likes: 26
From: Central Valley
because if I use the custom crank size the bore can stay 4.000 so less machine work I understand that desire to have something a little different. I've been kicking that around myself.
I'd like to build a 400.
3.825" Stroke
The bore would be 4.080.
The crank is an off the shelf piece but the pistons... not so much. I was kicking around asking Texas Speed their thoughts......
This motor will have a 2.9L Whipple on top.
My thinking was that I could get a little more piston to handle the boost, as well as, some uniqueness combined with a motor size that brings back a few memories.
Sorry about the thread jack.....
Build whatever makes you happy.
I'd like to build a 400.
3.825" Stroke
The bore would be 4.080.
The crank is an off the shelf piece but the pistons... not so much. I was kicking around asking Texas Speed their thoughts......
This motor will have a 2.9L Whipple on top.
My thinking was that I could get a little more piston to handle the boost, as well as, some uniqueness combined with a motor size that brings back a few memories.
Sorry about the thread jack.....
Build whatever makes you happy.
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Joined: Jan 2012
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Thread Starter
Joined: Oct 2005
Posts: 4,768
Likes: 26
From: Central Valley
Thread Starter
Joined: Oct 2005
Posts: 4,768
Likes: 26
From: Central Valley
I can understand wanting a true 396 as a tribute to the past, however I can relate to what 96 Comp T/A said in relation to odd-ball parts. FWIW another consideration would be doing a 402, as "396's" after 1969 were cleaned up .029 to a 4.125 bore and had an actual CID of 402 despite still being badged as a 396. Then you could pay true homage by badging your car as a 396 with an actual displacement of 402.