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Old 09-07-2005, 07:05 AM   #1 (permalink)
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383 build up QQQ's

I have a 400 sb and also a 305 sb TBI

also i have a set of pistons and a cam

I want to build a 383 TBI out of this combo ......is this posiible

any references, one issue is that Im in Chile parts are hard to get and labor is cheap



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Old 09-07-2005, 08:00 AM   #2 (permalink)
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Well your first issue is your 305 has a 3.736 inch bore. To make a 383 you use a 350 with a 4 inch bore (4.030 makes a 383, 4.060 gives you 388). When using the 400 crank to make a stroker ( you can buy actual stroker cranks) you need to have the mains ground down to fit in the "smaller block." Then there is some block machining so the rods dont hit. Then some oil pans wont fit. Ive seen where 305 valve covers wont work. It may be easier if you can find a 350 block. Or build a TBI 400.

Mine is a 350 bored .060 with forged rods, stroker crank, 10:1 comp., Edelbrock heads, RPM air Gap manifold, Barry Grant carb, noisy gear drive, MSD 6AL ignition, Billet HEI, Headers and dual 2.5 inch pipes that dump before axle. With TH350 tranny, and 4.1 gears I can spin 35's off the line.
After I rebuild the tranny, Im planning on some 4.88's and 38 or 39 inch rubber. ('73 K20)

Last edited by Trailblazr81; 09-07-2005 at 08:03 AM.
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Old 09-07-2005, 08:23 AM   #3 (permalink)
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THX


ill inspect the 400 block and if its fine ....ill go 400 tbi ...with a 10.5 ketih black pistons

and a 4x4 comp cams xtreme


>>>
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Old 09-07-2005, 08:26 AM   #4 (permalink)
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Quote:
Originally Posted by pcelle
THX


ill inspect the 400 block and if its fine ....ill go 400 tbi ...with a 10.5 ketih black pistons

and a 4x4 comp cams xtreme


>>>

You could get a set of bearing spacers and put your 305 crank in your 400, bore it over .030 and have a 377...

or you could do it right and just do your 400 up with a 400 crank.
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Old 09-07-2005, 09:12 AM   #5 (permalink)
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Be careful with the 10.5 pistons. With iron heads you'll probly have problems running on pump gas. With aluminum heads would be ok...
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Old 09-07-2005, 09:34 AM   #6 (permalink)
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thx ....pump gas here is 93 ..95 and 97 octane


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Old 09-07-2005, 09:36 AM   #7 (permalink)
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thx ....pump gas here is 93 ..95 and 97 octane
Lucky Bastard!

Yeah, I'd just build the 400. But I'd use a comp TBI cam so as not to have MAP issues.

Last edited by mountain4x4; 09-07-2005 at 09:38 AM.
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Old 09-07-2005, 06:09 PM   #8 (permalink)
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if you are looking to build a stroker you might be looking at the wrong parts.
- a stoker uses a longer crank than stock. (longer rotating mass than stock, good for torque and a few extra cubes than stock, bad for high rpm)

however......
- a d-stoked engine uses a shorter crank, this is more along the lines of what you are talking about. (shorter rotating mass, less cubes than stock, more for high rpm). you will find this kind of motor at the dirt track, or nascar. its good for turning the piss out of it, but not much for rock crawling....more like rock ass-hauling.

you would use crank spacers to fit in the 305 crank. the nice thing is you wouldn't have much clearance issues because you would have less rotating mass, so everything would spin closer to the center axis. the bad news is you would lose cubes, torque and have crap for compression without longer rods and deck work.


in the case of a 383 vs a 400 however, a 400 is capable of everthing a 383 is when parts are apples to apples. same crank, same stroke can be used for both, so the "stroker part of it is not a factor, and with a 400, you just have 17 more cubes. when everything else is equal, there is no replacement for displacement. the only reason a 400 is sometimes unpopular is the siameesed cylinder wall has a reputation for cooling problems. some people might say an overexagerated problem.

-humper
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Old 09-07-2005, 06:48 PM   #9 (permalink)
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Quote:
Originally Posted by tennessee rockhumper
if you are looking to build a stroker you might be looking at the wrong parts.
- a stoker uses a longer crank than stock. (longer rotating mass than stock, good for torque and a few extra cubes than stock, bad for high rpm)

however......
- a d-stoked engine uses a shorter crank, this is more along the lines of what you are talking about. (shorter rotating mass, less cubes than stock, more for high rpm). you will find this kind of motor at the dirt track, or nascar. its good for turning the piss out of it, but not much for rock crawling....more like rock ass-hauling.

you would use crank spacers to fit in the 305 crank. the nice thing is you wouldn't have much clearance issues because you would have less rotating mass, so everything would spin closer to the center axis. the bad news is you would lose cubes, torque and have crap for compression without longer rods and deck work.


in the case of a 383 vs a 400 however, a 400 is capable of everthing a 383 is when parts are apples to apples. same crank, same stroke can be used for both, so the "stroker part of it is not a factor, and with a 400, you just have 17 more cubes. when everything else is equal, there is no replacement for displacement. the only reason a 400 is sometimes unpopular is the siameesed cylinder wall has a reputation for cooling problems. some people might say an overexagerated problem.

-humper



THX .....ill be building the 400 TBI , as long as the block is fine


if not something shall come .........but the rule to follow is this one last stated " there is no replacement for despacement "
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