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Clearance on a 347 or 354 ??

  • Thread starter Thread starter ONEFAST91GT
  • Start date Start date Jan 28, 2004

ONEFAST91GT

Founding Member
Sep 10, 2002
492
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0
Central Jersey
Jan 28, 2004
#1
  • Jan 28, 2004
  • #1
I just tore down my 302 and I am in the process of building a stroker motor, either 3.400 (347) or 3.470 (354). I know you have to clearance the bottom of the cylinder walls for the rod bolts, my question is How big do you make the notches?? I want to have this done before my parts come in so i dont have to waste time mocking it up. So if someone could please let me know how Wide and how Deep their notches are I would be much appreciated.

Also, does the block need to clearanced anywhere else with the larger counterweights??

Also, is anyone using the bigger 3.470 crank??

Thanks
 
K

krashed182

New Member
Jan 30, 2004
2
0
0
Jan 30, 2004
#2
  • Jan 30, 2004
  • #2
ONEFAST91GT said:
I just tore down my 302 and I am in the process of building a stroker motor, either 3.400 (347) or 3.470 (354). I know you have to clearance the bottom of the cylinder walls for the rod bolts, my question is How big do you make the notches?? I want to have this done before my parts come in so i dont have to waste time mocking it up. So if someone could please let me know how Wide and how Deep their notches are I would be much appreciated.

Also, does the block need to clearanced anywhere else with the larger counterweights??

Also, is anyone using the bigger 3.470 crank??

Thanks
Click to expand...


Notches should be in between a half inch to 3/4 inch deep but you will have to assemble a piston and lay the crank in ti figure out where exactly the notches will be. You can use the same piston just put it in each cylinder and rotate the crank until the bolt barely touches the block mark with sharpie and move on. Use die grinder and round file (Round file important).
 

ONEFAST91GT

Founding Member
Sep 10, 2002
492
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0
Central Jersey
Jan 30, 2004
#3
  • Jan 30, 2004
  • #3
I marked the center of the stock bolts to the cylinder, so I already know where the center is. I just wanted to know how wide and deep everyone is making theirs. We have a bridgeport at work, so Im not going to mess around with a die grinder for hours...
 

giddyup306

Founding Member
Oct 22, 2002
3,041
2
59
Jan 30, 2004
#4
  • Jan 30, 2004
  • #4
ONEFAST91GT said:
Also, is anyone using the bigger 3.470 crank??
Click to expand...

Yep I ground down a 351W crank to throw in a 302. 3.500" stroke.

Mike
 

ONEFAST91GT

Founding Member
Sep 10, 2002
492
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0
Central Jersey
Jan 30, 2004
#5
  • Jan 30, 2004
  • #5
...
 
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