anyone know about them? I've seen that their pistons look a lot taller than 350 pistons. can you use longer rods? I remember one time a magazine used like Ford 6.250" inline 6 rodss with a 327 crank and 400 block to make a 350. They got 11:1 compression and used 87 octane. I've been thinking of a long rod 327 for my jeep. Lots of placed have 6.0" rods but I haven't seen any readily availible longer ones. Where would I find a rod and piston set like that? I know LS1s have 6.125" rods so it must be a good idea. A single plane TBI would go on top too. a simple intake swap every 2 years and its smog legal


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-Tas
'89 Formula WS-6

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not sure what you're trying to do but unless it was something very specific, like class legal racing, i'd ru na 350 or start with a 350. the 327 is a great engine and about my favorite SBC. i doubt if you can amke anything more than 6" rods work in a SBC. the 327 is a 4" bore just like a 350, the pistons have differant wrist pin location and it has 1/4" less stroke.

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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM

 

the point would be to maximise TDC and BDC to help be more efficient. As for the 327, its sounds cool . everyone has 350s.
-Tas

 

Do you mean Big six Rods, or Small six Rods....

niether will fit very easily... but I belive the small rods will with a bit of resizing, as for rod length, It escapes me right now. I can find out if you want.


144/170/200/250 all have differnt length rods. 144 being longest. I have a Set.




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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver 14.82 @ 91.1
Reader's ride -> My Ride

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

 

the article was called the 350 chevy should have built. It was in June 97 hotrod. They used a Ford 300 6 rod that was 6.209 inch and a 400 block. The motor used an AFR190 head with a 2.00 intake and 1.56 exhaust in an effort to keep the chamber size small. They used a Comp 270 hydroller (215 at 050) and a performer rpm. the motor made 412hp and 435 ft/lbs of torque at 5700 and 3800 respectively with 11.0 to 1 and pump gas.

I really don't find these numbers extremely impressive. These same results can be obtained with a 350 using pump gas without all of the ford/chevy swapping.

There is no reason to push an engine to 11.0 to 1. Hp increase is pretty linear from 9 to 11 to 1 and there is no magic once you pass a certain threshold. The motor made almost 440 ft/lbs of torque becuase it had the bore of a 400 not because it had a 327 stroke or ford rod.

The main reason to build a destroker is to be able to turn high rpm, they did not even attempt to leverage the rpm potential of this motor. Instead they built it for midrange torque. A 383 or a 377 (with a longer stroke, something about 3.625) would have been a better combination in my opinion.

Rod length has a minimial impact on HP output at anything below 6000. Especially when you compare 5.7 rods to a longer one.

When a motor is designed from the ground up, a longer rod can be considered and the ring location not be compromised. There is not much flexability on a 350 (or small block chev) for this type of compression height/rod/stroke reconfiguration.


[This message has been edited by jcb999 (edited June 26, 2001).]

 

I remember that article, what was impressive was that the engine made close to 400ft/lbs of torque from about 2000RPMs on, IRC.

They also had to have the wrist pin holes cut pretty high...way into the oil control ringlands.

Agin, I thought it was impressive to get that much torque so quickly and that much HP, on 87 Octane (cheap station too IIRC) without detonation. The torque curve was pretty flat from 2000 through 5000+ RPMs, very nice for a street motor, IMO.

 

your right but i have the another carcraft article that they build an identical 350 (heads and cam) based motor. I don't think there was more than 10ft/lbs of difference between the 2. And considering that 400+ ft/lbs of torque at 2500 will only get mega wheel spin, i would prefer it come up a little later.

I will post some text of the CC article around lunch.

 

FYI -

The NASCAR guys run a 358 that's 4.155" x 3.31". They run them 8600 RPM for a whole afternoon.

If you were to take a 327 crank, standard off-the-shelf 400 pistons with a 1.55" pin height, and 5.85" rods, you would come out with a combo that has a total "height" of 9.025". You could bring it to nominal SBC deck height by shaving .025" off the top of the pistons. Alternatively, in a typical production block (.025" deck clearance nominal), undecked, that combo out of the box with a 1044 FelPro head gasket will give you about .050" of piston-to-head clearance.

I've never built this combo; but I've got a large-journal 327 crank, so I might someday. This would give a 347 at std 400 bore, or about 353 at .030" over.

If I were to build it I would definitely reserve it for a situation where I could take advantage of its superior high-RPM characteristics; i.e. big port heads, long-duration cam, etc.

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"So many Mustangs, so little time..."
ICON Motorsports

 

It would be fun Rb

240/300 is Considerd the "Big" Six.

240's Have longer rods tho


240/300 are the same casting, differnt stroke.

300 crank/240 rods, 240 head = long stroke Long rod 300 w/ high compression.

friend of mine building one with 3 weber sidedrafts and putting it in a tubbed and tube chassis all firebirdglass 81 F150 stepside... weeeeeeeee



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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver 14.82 @ 91.1 (faster than Ed)
Reader's ride -> My Ride

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

 

cr craft April 95. A test of the AFR hydra rev kit for rollers. 350 with 10 to 1 and comp270 magnum hydroller.

425 ft/lbs of torque at 3250 (the lowest rpm they tried to put a load on the motor). did not drop below 400ft/lbs until 5500 rpm. The 327/400 combination was below 400ft/lbs by 5200. Sounds like an awful lot of trouble to me for a little more (and not much) lowend. This motor ran fine on pump gas also. I don't see any real reason to go to a 6+ inch rod just to allow 11 to 1.

If your going to run a long rod I would not attempt to use any factory forging (especially one from a ford or olds) to retrofit to a chevy. You can get many rod lengths in the 5.85 to 6.25 inch range for small blocks that will be much stouter than any factory 6cyl forging (probably actually a casting). Especially if your going to spin the whee out of it.

[This message has been edited by jcb999 (edited June 26, 2001).]

 

Actually they are forged, If you get teh 240 rods that is...


Very strong. But I agree, In anything but a displacement limited, all out racing Motor, Going through all the extra effort for maximum rod length ect is not worth it. Gains in stabilty and power are so minimal at street, even most race RPM that is just a waste...

but the theory is good


how about a 4 main 200 crank in a 170 block. stroked to 183 CI... 144 rods gives about a 1.7 Rod ratio.....

or Do like they Do in Brazil and Put a 170 crank in a 221, 188 CI 9,000 RPM screamers.




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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver 14.82 @ 91.1 (faster than Ed)
Reader's ride -> My Ride

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

 

If you want to run a inexpensive 6 inch rod, get an OLDS rocket 350 rod. They r 6 inches.

 

I was going to suggest an Olds rod also. The wrist pin hole needs to be reamed out to fit a chev wrist pin but it's cheap 6" rods.

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WOW! great info guys. I wouldn't destroke a 400 though. I'd keep it at that size. I was just wondering about those long rods on a standard type bore 327.
-Tas