Im just curious because I dont see alot of people building these, is there something agaisnt doing a 350 with a 6inch rod?

 

I ran a .030 350 with 6 inch rods for several years in my 93. I was runing the cc305 cam and 1.6s with ported LT1 heads. It made the cam sound much bigger than it was. It ran very well too. In a 93 T/A with full interior it ran a best of 12.29 @ 113 mph (@1500 ele). I would build one again , but I went with the 3.75 stroke this time.

 

Using a 6" rod in a 350 also means you will need new pistons with a decreased compression height. Having spent the money for pistons and rods, why not spend a little more for a longer stroke and benefit from a meaningful increase in displacement?

There's an old saying, with which you're probably familiar"

"There is no replacement for displacement".

Boost and nitrous merely complement displacement, they don't replace it. Put 6 pounds of boost or a 100-shot into a 350, then do the same to a 383. Any guesses as to which motor will make more power?

 

So how is the 6" rod making it a 367? Are we talking cubes here? Just confused on that.

Bret

 

More stroke right? Just like a 383 is with a bigger crank and rod. Or am I wrong?>

 

Where did you get 'that number' from?

Also, wouldn't more "stroke height" keep the piston the same amount higher in the bore at bottom center and make no change in displacement?

I thought just bore diameter, stoke, and number of cylinders defined displacement.

So, a 6" rod moves the wrist pin higher in the piston? Can someone explain how this makes more displacement? Bret?

Ben T.

 

it doesnt...but i would like to know where he got"367" from?????

 

Yeah. The increased length of the rod is usually offset by a higher wrist pin hole in the piston. The net length of the two in relation to the deck height doesnt change.

 

3.48 x 4.100 = 367 (won't work without sleeves)

3.50 X 4.090 = 367 (too much bore)

I'm confused.... what's new

 

My response was to his query on the advantages of using a 6" rod in a 350. Of course just changing the rod length (and the piston) will not increase the displacement. But, if you're going to fork over the dough for new rods and slugs, why not spend a little more and gain some displacement?

He may have mistyped, as I believe the displacement he was referring to was 357 cid (4.040" bore x 3.480" stroke or 4.030" bore by 3.500" stroke).

Sorry if I wasn't clear enough in my first response.

 

I didnt see the ci 367 until you gys pointed it out as well.
My experience is with a standard stroke 3.48 6 inch rods, and appropriate pistons on a .030 overbore(355)

 

Yeah I was thinking 355 as well.

Unless.......

You go to small journal rod pins and offset grind the crank....

3.58 Stroke and 4.040 bore = 367 cubes.


Bret

 

Sounds expensive!!

 

Gentlemen, Speedo-Motive makes different size stroker kit, and soon they are coming out with one called "The LT-1 363"

Here is their link to SPEEDO-MOTIVE. BTW a friend of mine used one of their 415 SBC kits, which utilizes a brand new 4340 400 SBC CRANK which is offset ground to 3.832"stroke with 2" rod journals, and 2" journal 6" H-BEAMS, and it runs great. He just ran that combination in his BLAZER, with pocket ported CANFIELD 195's, 2" primary headers to 3" with 1-chamber FLOWMASTER with turn-downs, a 252/260 @ .050 FLAT-TAPPET SOLID CAM, 4200 stall in a TH-350 and 9" with 4.11's First run last weekend WITHOUT TUNING, he ran a 6.99 in the 1/8 mile, pulling the tires 20+ feet.



http://www.speedomotive.com/CHEVY%20...ANK%20KITS.htm

HTH's

 

I suspect that's a typo...