Big Inch Small Block

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BarracudaWild68

BarracudaWild68

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Hello. Have you or anyone you know or have heard about, built that huge (476 cu. in.) big-inch small block that is in the back of that book titled "How To Build Big Inch Mopar Small Blocks"? It would be a tremendously great engine to have in an A-body, but the block alone is thousands of dollars bare. I'd love to know how much money it would take to complete it, with as many modestly-priced parts as would be safe or practical to use in building this bad boy, since it would need custom-made pistons and quite possibly a dry sump system. The authors stated that with moderate effort, the engine combo could make 850 hp., no problem. I know that it wouldn't be necessary to have it in your car to have fun, but oooh boy, that sound and fury that engine would produce. I'll most likely just build a high horse 318 and call it a day. Just pipe dreams, I guess. You never know.
 
Acquaintance of mine ran a 468 in his 71 demon for several years. Cover car on Mopar Muscle, street driven nine second n/a car. Also had a later build Valiant on the cover too.
He built a 502, (yes, small block) but it was just too over the top, internals were too light, it didn't last long. While it was running, it made power!
 
33IMP said:
Acquaintance of mine ran a 468 in his 71 demon for several years. Cover car on Mopar Muscle, street driven nine second n/a car. Also had a later build Valiant on the cover too.
He built a 502, (yes, small block) but it was just too over the top, internals were too light, it didn't last long. While it was running, it made power!
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What was the bore and stroke combination on the 502?
 
I don't recall. What ever the maximum bore was of a race r-block, light small Chevy rods, with light pins, Honda rod journals, hockey puck pistons, billet crank with 4.25 stroke (at least, may have been more). Dry sump.
If memory serves, it kicked a rod out. Chevy part.
 
33IMP said:
I don't recall. What ever the maximum bore was of a race r-block, light small Chevy rods, with light pins, Honda rod journals, hockey puck pistons, billet crank with 4.25 stroke (at least, may have been more). Dry sump.
If memory serves, it kicked a rod out. Chevy part.
Click to expand...
You ever notice sometimes it's those type builds that just don't last? All that money and special machine work and matching all those "mismatched" parts to try to make something work and then a wore our bore, dirt road build out lasts it. lol
 
I think it was an engineering exercise, as much as anything else. It was a can-it-be-done thing. The guy is Homer Simpson, only smart. Real life nuclear engineer.
 
33IMP said:
I think it was an engineering exercise, as much as anything else. It was a can-it-be-done thing. The guy is Homer Simpson, only smart. Real life nuclear engineer.
Click to expand...
I think it's cool. I would love to have seen it. I wonder of it could be duplicated to where it would actually last?
 
That big? I don't think so. On the other hand guys have put big strokes in R5P7 Nascar motors and made power.
(If memory serves, the 502 was a w8 combo. Amazing looking heads.)
 
33IMP said:
Acquaintance of mine ran a 468 in his 71 demon for several years. Cover car on Mopar Muscle, street driven nine second n/a car. Also had a later build Valiant on the cover too.
He built a 502, (yes, small block) but it was just too over the top, internals were too light, it didn't last long. While it was running, it made power!
Click to expand...
Ron Silva ?
 
Another thing to bear in mind when going this much bigger [ twice the capacity of a 340 ] is that the cyl heads available were never designed to feed so many cubes & engine output could be limited because of limited air flow.
 
I run the R3 428 Victor heads , solid roller ,injection in a TA on the street purrs like a kitten well behaved .
See test running engine with carby
 
AUSA66 said:
I run the R3 428 Victor heads , solid roller ,injection in a TA on the street purrs like a kitten well behaved .
See test running engine with carby
Click to expand...


Tell us about the Victor heads!
 
Bewy said:
Another thing to bear in mind when going this much bigger [ twice the capacity of a 340 ] is that the cyl heads available were never designed to feed so many cubes & engine output could be limited because of limited air flow.
Click to expand...

W8 heads were mentioned... shouldn't be too bad a choice even for 502 cubes.
 
wow catching a woodie just hearing the air going through the carb:lol:
 
33IMP said:
I don't recall. What ever the maximum bore was of a race r-block, light small Chevy rods, with light pins, Honda rod journals, hockey puck pistons, billet crank with 4.25 stroke (at least, may have been more). Dry sump.
If memory serves, it kicked a rod out. Chevy part.
Click to expand...
Chevy part? Not unless it's stock, made of the same material as any other aftermarket.
 
RustyRatRod said:
You ever notice sometimes it's those type builds that just don't last? All that money and special machine work and matching all those "mismatched" parts to try to make something work and then a wore our bore, dirt road build out lasts it. lol
Click to expand...
Yep, thick cylinder walls and a reasonable height piston will perform well and last forever.
 
Big cubic inches in itself has proven to be not the winning combo as look at what the NMCA N/A small tire guys run and they aren't maxed out cubic inch engines
 
thesiren74 said:
Chevy part? Not unless it's stock, made of the same material as any other aftermarket.
Click to expand...
That's true, poor attempt at a cheap shot at Chevy. The rods were full custom, to use with the Honda size rod journals. I do remember being told they were as light as he could get them made.
 
33IMP said:
That's true, poor attempt at a cheap shot at Chevy. The rods were full custom, to use with the Honda size rod journals. I do remember being told they were as light as he could get them made.
Click to expand...
600 hp is very conservative, my 9.5 to 1 comp. 4 inch stroke 408 , R3 block, Indy 360-1 heads, 600 lift mechanical cam made 539 hp / 502 tq , very mild to run pump gas, ran 10.69 in my 3,150 lb. Dart it ran good until the crank cracked luckily nothing else got hurt, it has the potential for tons more power with a roller cam , more compression , and some head porting. There is an acquaintance of mine that has a small block Mopar that is around 950 hp.

7C6221A8-91B0-42BD-94B7-65C31B0AEBD4.jpeg
 
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Agree!
There is a guy on this coast running a white dart with a 420+ inch small block in the small tire/n.a. classes. Best (I think) of mid fives at 3000 plus lbs. Also around 900 hp I think.
 
976 hp here at 434 cubic inches......one of the other members also has a very good running 434 too
 
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