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377 vs 383

 
Old 02-06-2019, 01:43 PM
  #61  
Tom400CFI
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Originally Posted by MatthewMiller View Post
Good reference. I have no doubt that's true. As I understand it, to adapt LT heads would require steam holes to be drilled plus the welding/plugging of a couple water passages. I guess on the block, I don't know what would be required to use the LT's geared water pump and optispark. The latter is required to use the PCM. So there might be a fair amount of work involved in converting over to a Gen 1 block like a 400. OTOH, it sure would be fun to gain 25 extra cubes!
If you want a 400 CID "LT1" (if that's what you're getting at), the fastest, easiest way to that is a SBC 400, Miniram, and an "option converted" HEI distributor...then run it all off the LT1 ECM/harness.



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Old 02-06-2019, 02:47 PM
  #62  
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Originally Posted by Tom400CFI View Post
If you want a 400 CID "LT1" (if that's what you're getting at),
Yes, except I'm fantasizing about throwing my current 3.875" crank into a .030-over 400 block to get a 421 vs my current 396. But same idea.

the fastest, easiest way to that is a SBC 400, Miniram, and an "option converted" HEI distributor...then run it all off the LT1 ECM/harness.
Guessing that was supposed to be "optical converted" or "opti converted." Okay, that makes perfect sense. I see a couple writeups for making your own, and maybe the "dual-sync" aftermarket options would work? Just more time and money, but it's doable. Nothing I'm going to be worrying about any time soon, but I'll file that away in the back of my mind for the future.
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Old 02-06-2019, 03:13 PM
  #63  
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Originally Posted by MatthewMiller View Post
Yes, except I'm fantasizing about throwing my current 3.875" crank into a .030-over 400 block to get a 421 vs my current 396. But same idea.


Guessing that was supposed to be "optical converted" or "opti converted." Okay, that makes perfect sense. I see a couple writeups for making your own, and maybe the "dual-sync" aftermarket options would work? Just more time and money, but it's doable. Nothing I'm going to be worrying about any time soon, but I'll file that away in the back of my mind for the future.
Yes...OPTI Converted. God Damn spell check. It's like cars with doors that lock themselves for you. Great....until you can't get out.

That is roughly my plan for my '92; a Gen 1 SBC 400/miniram, a Tom-converted Opti/HEI. Nothing special...but it will have that nice PULL in each gear that the stock 350 doesn't.
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Old 02-06-2019, 03:28 PM
  #64  
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Originally Posted by Tom400CFI View Post
Yes...OPTI Converted. God Damn spell check. It's like cars with doors that lock themselves for you. Great....until you can't get out.

That is roughly my plan for my '92; a Gen 1 SBC 400/miniram, a Tom-converted Opti/HEI. Nothing special...but it will have that nice PULL in each gear that the stock 350 doesn't.
Please tell me you're going to create a thread on that Tom-conversion!
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Old 02-06-2019, 04:50 PM
  #65  
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Yeah, I'm sure that I will. It may be years...even decades away though. First, I need to build the 400. For that, I need disposable $$. With a family, that may never happen. :-/

My buddy has an '88 fox. He's "going to build a 347". I have two 400's in my garage -one bare, virgin block, the other a medium used short block. I'm "going to build me a 400"....some day. I joke with my buddy that we're in a drag race. We're racing to see who has their engine built/running first. We're both losing.

-Tom


.

Last edited by Tom400CFI; 02-06-2019 at 04:50 PM.
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Old 02-06-2019, 05:07 PM
  #66  
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Originally Posted by Tom400CFI View Post
Yeah, I'm sure that I will. It may be years...even decades away though. First, I need to build the 400. For that, I need disposable $$. With a family, that may never happen. :-/

My buddy has an '88 fox. He's "going to build a 347". I have two 400's in my garage -one bare, virgin block, the other a medium used short block. I'm "going to build me a 400"....some day. I joke with my buddy that we're in a drag race. We're racing to see who has their engine built/running first. We're both losing. .
I totally understand that!
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Old 02-06-2019, 09:03 PM
  #67  
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i have a 64 roadster. custom or mod. call it what you will. i have a pro built 400 stroked to 421. it's about all any sane person would want on the street and still be able to just cruise. the xtra c.i. and the torque are wonderful. yes, i have a tbi fuel injection set up on the engine.
phil
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Old 02-06-2019, 09:36 PM
  #68  
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Originally Posted by candipogo View Post
i have a 64 roadster. custom or mod. call it what you will. i have a pro built 400 stroked to 421. it's about all any sane person would want on the street and still be able to just cruise. the xtra c.i. and the torque are wonderful. yes, i have a tbi fuel injection set up on the engine.
phil
Yes, there is no real reason to have a destroyed street engine. Take a stock c4 especially stick, throw cubes in it and have fun.
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Old 02-07-2019, 08:22 AM
  #69  
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Thank you for all the feed back. Based on the input I will be going the 383 route. I may also bold on some long tube headers this season and explore the miniram set up prior to my build so I can get a some added performance (although limited I know) in the mean time.
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Old 02-07-2019, 03:43 PM
  #70  
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Originally Posted by Tom400CFI View Post
If you want a 400 CID "LT1" (if that's what you're getting at), the fastest, easiest way to that is a SBC 400, Miniram, and an "option converted" HEI distributor...then run it all off the LT1 ECM/harness.


Now that's interesting.

My input, rpm limitations back in the day were due to the materials of the stock cranks.... as in nodular. My current 383 is in a truck and fuel cutoff is programmed to 6300 with 6000 rpm shift points. However it has a cast crank and I'm terrified everytime it spins that high. do whatever you want. It's a freaking street car. If done right you'll never kill it anyway in either configuration.
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Old 02-08-2019, 10:56 AM
  #71  
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Originally Posted by 449er View Post
This statement was always true UNTILL the LS based small blocks came to be!
.. Ahhh ! but even the LS blocks are available in a variety of displacements LS1=350 , LS3=372-ish , LS7=427 ..
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Old 02-08-2019, 11:09 AM
  #72  
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Originally Posted by C409 View Post
.. Ahhh ! but even the LS blocks are available in a variety of displacements LS1=350 , LS3=372-ish , LS7=427 ..
And you can now buy an LS with stock block dimensions (i.e. not a tall-deck block) up to at least 468 that will live at any rpm you want. And if you have the cash, there is no good reason not to do that. No matter how well an engine breathes, more cubes is always better.
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Old 02-08-2019, 07:25 PM
  #73  
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If I was going with a new 350 block I'd go 377. If I was rebuilding what I had 383.
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