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  #31 (permalink)  
Old 04-02-2010, 04:59 PM
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Quote:
Originally Posted by my87Z
you must have gotten that quote from me. "you can polish a turd all you want but in the end you still just have a turd"

i would actually say that the 396 is the 305 of big blocks and that the 366 is the 265 of big blocks. it's just hard to make a bunch of power out of them cause the have a small bore
Ayuh,... I don't claim to be the original,...
But I'm betting you weren't even a twittle in daddy's eye yet,....
1st time I heard that saying...

It's hard to justify building a perfectly good Boat Anchor into a motor,...
When SBCs are a dime a dozen,+ What,..?? 150lbs. Lighter,..??
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  #32 (permalink)  
Old 05-29-2010, 11:24 PM
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i have a 366 engine and it runs great in my 1991 chevrolet kodiak

my question is how far can you bore a 366? i know you can put up to a 4.5" stroker crank in it due to the 10.2 tall deck. but i would like to bore it to 4.25" is that possible. i have been told it will bore 4.00 easy. if i stroked it 4.5" and bored just to 4.00" would be like a 500ci stroker bbc? yes? no? how far has someone here bored a 366? thank you for your time. mike in oklahoma
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  #33 (permalink)  
Old 05-30-2010, 12:24 AM
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Quote:
Originally Posted by OLDSKOOLPROMT
my question is how far can you bore a 366? i know you can put up to a 4.5" stroker crank in it due to the 10.2 tall deck. but i would like to bore it to 4.25" is that possible. i have been told it will bore 4.00 easy. if i stroked it 4.5" and bored just to 4.00" would be like a 500ci stroker bbc? yes? no? how far has someone here bored a 366? thank you for your time. mike in oklahoma
Hey Mike, well, you have to leave some cylinder wall in the motor to contain the explosions. Smokey Yunick said that 0.135" cylinder wall thickness would be about the low limit. The stock 366 cylinder is 3.935" and since you can bore most big block Chevies 0.100" over stock with few problems, I would venture to guess that you may be able to bore one of these motors out to 4.035" and still have a valid block to play with, but I suspect that would be about the limit.

If you could find 4.035" pistons that would work (very doubtful) and could fit a 4.5" stroke crank in there, you still would only have 460 cubic inches. I suspect the pistons would be customs at the rate of about $800 or more for the set. Whereas, if you start with a conventional 9.800" block, bore it 0.100" and install a 4.5" crank, you have a 535 cubic inch motor. All the stuff to do this is on somebody's shelf, nothing custom.
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  #34 (permalink)  
Old 05-31-2010, 01:29 AM
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i was told you cant put a 4.5" crank in a 9.800 block??

i was told by a reputable machinist that 4.25" is the largest stroke you can put in a 9.800 block. to use the 4.5" cranks you have to use a tall deck block. so can you put a 4.5" crank in a 454 9.800 block? mike
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  #35 (permalink)  
Old 05-31-2010, 02:31 AM
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Quote:
Originally Posted by OLDSKOOLPROMT
i was told by a reputable machinist that 4.25" is the largest stroke you can put in a 9.800 block. to use the 4.5" cranks you have to use a tall deck block. so can you put a 4.5" crank in a 454 9.800 block? mike
Yeah, I think your machinist is correct, although you might be able to squeeze a 4.375" arm in there. I wasn't taking that into consideration when I formulated the answer. I was just giving you comparisons to bore and stroke in different combinations and trying to show you that it would be a waste of time to try to build a large displacement motor starting with such a small bore.
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  #36 (permalink)  
Old 06-09-2010, 10:20 PM
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i am just going to buy a merlin tall deck 10.200 block with 4.5in bore standard and put a 4.5in stroker forged bottom end in it and go from there. that makes a 572ci. will fuel infect it, aluminum 115 chamber heads with all the goodies cncd, .650 lift 225 duration roller cam, 1.75 roller rockers, arp every nut and bolt, and deck it out with all kinds of aluminum; pan, valve covers, timing cover, air cleaner, so on.... make a nice motor for my tow rig. mike in oklahoma
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  #37 (permalink)  
Old 06-10-2010, 06:52 AM
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Quote:
Originally Posted by OLDSKOOLPROMT
for my tow rig.
Hate to see what goes into your hot rod! lol
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  #38 (permalink)  
Old 06-10-2010, 07:36 AM
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Originally Posted by cobalt327
Hate to see what goes into your hot rod! lol
Maybe an 850" mountain motor w/ 2 600hp kits?...LOL
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  #39 (permalink)  
Old 06-12-2010, 08:51 PM
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Heavy Truck Motor

Quote:
Originally Posted by techinspector1
Hey Mike, well, you have to leave some cylinder wall in the motor to contain the explosions. Smokey Yunick said that 0.135" cylinder wall thickness would be about the low limit. The stock 366 cylinder is 3.935" and since you can bore most big block Chevies 0.100" over stock with few problems, I would venture to guess that you may be able to bore one of these motors out to 4.035" and still have a valid block to play with, but I suspect that would be about the limit.

If you could find 4.035" pistons that would work (very doubtful) and could fit a 4.5" stroke crank in there, you still would only have 460 cubic inches. I suspect the pistons would be customs at the rate of about $800 or more for the set. Whereas, if you start with a conventional 9.800" block, bore it 0.100" and install a 4.5" crank, you have a 535 cubic inch motor. All the stuff to do this is on somebody's shelf, nothing custom.
These are not pass car or pick-up truck blocks. They are industrial grade motors. You will find many references to thicker walls in the cylinder area. Tom Wilson's book quotes pushing to .125" over easily. You might consider getting to 4.09 and stuffing some 396 pistons in it and then going with a set of 6.435 rods... run a solid roller comp cam with .620 lift and you got 560 ponies on pump gas.
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  #40 (permalink)  
Old 06-12-2010, 09:14 PM
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Helpful links

http://books.google.com/books?id=gsg...0walls&f=false

http://forums.hybridz.org/index.php?showtopic=37175

I have a set of 402 forged pistons.... I see I can get a set of bushed H rods brand new 6.535 from SouthWest Speed for $381.

To run stock height short deck with 4.5 stroke you need 5.8 rods for BBC... not sure they are around for low $$$.
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  #41 (permalink)  
Old 06-13-2010, 07:45 AM
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481 Stroker

Quote:
Originally Posted by OLDSKOOLPROMT
my question is how far can you bore a 366? i know you can put up to a 4.5" stroker crank in it due to the 10.2 tall deck. but i would like to bore it to 4.25" is that possible. i have been told it will bore 4.00 easy. if i stroked it 4.5" and bored just to 4.00" would be like a 500ci stroker bbc? yes? no? how far has someone here bored a 366? thank you for your time. mike in oklahoma
Mike,

4.5 stroke, 6.335 rods and KB 4.125 bore pistons KB-361 (you will have to take .010 off the piston top) gives you a 481 stroker. With a 4.25 stroke you get a long stroke 454..... Rods $381, Pistons and rings $280, Scat crank (nodular 4.25) $221, Gaskets $60, Machine work and balancing $500, Comp Cam http://www.compcams.com/Cam_Specs/Ca...?csid=499&sb=2 $300, Solid Roller lifters (I buy used Crower HIPO for around $250), headers, dual plane intake, 750 CFM and a three inch exhaust.

I have a stock stroke 402 with this set up and it does 560 dyno (oval port GM iron heads). the stroker has to get you to the mid 600 hp range if not 700 hp with the 4.5 stroke. No guarantees but there is some promise there without too much money.

I have a 366 and am considering.... of course that is after I get the V12 702 out of the middle of the garage. Thats torque as long as she stays together at 5000 rpm
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  #42 (permalink)  
Old 06-13-2010, 09:00 PM
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my tow rig is a 1996 chevrolet kodiak c7500 4x4 that has a 366 gas engine in it. need more hp and tq so was looking at options with the 366. but after talking to guys here i am looking for a tall deck merlin block. thanks, mike in oklahoma
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  #43 (permalink)  
Old 06-20-2010, 11:30 PM
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found a merlin block and bought it. 10.200 tall deck block. 4.50 bore and up to 4.750 stroke possible. i am going to run a forged bottom end 4.5 crank and 4.5 pistons. makes 572ci. will run 9.5:1 compression so i can run pump gas in it with no problems. i am running a 1000cfm efi injection system. should be a decent motor for my tow rig. thanks all for your help, mike in oklahoma
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  #44 (permalink)  
Old 06-24-2010, 04:42 AM
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Merlin Tall block$$

How much did you find the Merlin for?
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  #45 (permalink)  
Old 06-24-2010, 08:32 PM
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it was 1200.00 including shipping. will make a nice base for my power plant.
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