I have an extra set of 2006 heads and jugs, thinking of diamond cuts for the fins and street-port on the heads...a 95 big bore is on my horizon!

I want to keep the same stroke; what are my options for bore size...will 10.5:1 forged pistons cause reliability problems down the raod?

 

I put some Axtell cylinders on. They are 3.937 I think. From NRHS. Their pistons also (Forged flatop JE). 0.30 gasket. JIMS has some like that too and pistons. Theyboth have much thicker iron liners that are cast in and take an overbore better. Uses a 4.000 dia gasket. About as big as can be put into stock cases.

Would come out to about 96 or 97 cu. in. for you.

You can go 3.850 (0.10) overbore or so with stock cylinders. Maybe more.
Has to do with keeping the cylinders round and sealing the rings better. Can be a problem with big, air cooled cylinders. Thicker liners help.

I have about 10-1 compression and am glad I put in compression releases. Don't always need them maybe. Piece of mind and Summer coming on.

 

It shouldn't with the proper set up, you need to talk to some of the guy's from HeadQuarters or Hillside or GMR(HDWRENCH), they can and will help you lay out the engine build that you want.

 

I believe the 98" piston/cylinder kit is the largest you can go before you get some clearance issues. After that, you'll have to stroke the motor to keep getting larger.

Steve

 

Thanks Guys...

I think Igot my answer; I visited an engine builder yesterday, he showed me a set of cylinders that had been bored to 95"...there isn't much cylinder wall left to hone away. I guess I'll stay with a 95 build andlookat cam / piston options; I'd like more roll-on power up to 3000rpm...need more torque on the lower endfor merging and passing while on the interstates.

This is a daily driver to work for me so keeping gas mileage above 35mpg is a concern as well.

 

I bore and fit 98" pistons to stock 88 cylinders at the rate of 2-3 a week and have not had any come back in the last year. The cylinders can be purchasd on ebay for 40 dollars a set and bored and fit for 480 so I guess my customers say "why pay more?" Axtell's makes a great cylinder and we use a lot of them, we use a lot of stock also. 3 cubes more is 3-4 horse more so no big deal.

 

Kingofcubes,

This is the info I was looking for! I'd love to punch my cylinders to 98"! Do you have any customers that I can email for more info?

Thanks...

 

Boring to 98" is not new.
We have been there before, and it works well, as you can witness the power increase on the dyno.

 

If wonderment was as to the largest cylinder size that can be used on a T/C cylinder bolt pattern. The answer to that would be 4.250.
That cylinder size is not what we a comfortable with, but it is available.
We stay at the 4.125 bore size. In this case less is better, we feel.