348 chevy crankshaft options

I am building a 348 for my 63 nova gasser and I've heard that a 409 an a 427 crank drop right in without any custom machining is this true?

Thanks

 

There is machining involved. Was a common swap with the 396 cranks when they first hit the road and then the later cranks as well. Snout and oil seal perch must be turned down to the w-motor spec. Use the search on here. Lot's of info.

 

check out the last issue of street rodder, it had a huge artical on W motors

 

try this site

www.348-409.com

 

A 409 crank (3.5" stroke) is basically a bolt in-might have to do a little clearance work on the block to clear the counter weights. It gives you somewhere around 370/380 cubic inches.
The big block cranks need lots of work to fit. You gotta turn the mains, nose of the crank and ???
Check at 348/409.com. They have lots of info in their forums about the switch. Also about using big block cranks.
Larry T

 

Thanks For all the great information

 

We use an aftermarket 409" (4.000") stroker crank to build a 477" unit based on the 409" platform. This is a "4340" steel crank NOT cast!

The same crank with the 348" platform will give you approximately a 434" unit. These cranks go right in the block and use a 6.135" BB connecting rod. We use some H-beam rods and some custom pistons.

They use a "target-bobweight" of 2350 grams and remain internally balanced at that level!

Thanks, Gary in N.Y.

P.S. Have done strokers with the G.M. shafts over the years, both the 427's (3.766") and the 454's (4.000"), it's just too much machining to get it all together. These new shafts make it easy!

 

like tman said try the 348-409 site good info their

 

The 409 crank is a drop in. No grinding or anything. The only thing you have to do is massage the oil pan for clearance. The pans are differant. If your not going to get crazy this is the cheapest route to up cubes. .060 bore gives ya 388, almost same bore and stoke as 383 sbc. I would highly recomend changing to bbc rods if your going to spin it much they are the weak link.

 

What company makes the aftermarket 409 crank that you use?

 

Eagle makes W block stroker cranks. Ross makes pistons for stroker 409's (maybe 348's too.), they are made to use big block rods.
You might check with A. Bruneau Performance parts for more info.

http://www.bruneauperformance.ca/

 

Thanks Larry T