[9secdport]

using an ia2 block and tiger heads what would be the highest lift and rpm that could be used and keep the motor reliable.reliable meaning going a season without changes of parts.

[johnta1]

Depends on the rotating assembly mostly.
Need good rods and pistons, then the crank to keep it together.

[9secdport]

we ordered the billet crank from Ken Keefer.We also have a question as to which rod to use a good steel rod or alluminun.we are think of using nitros on special occasions.

[tom s]

why dont you just call Ken and see what he would put in it?Tom

[10second70GP]

Originally Posted by 9secdport

we ordered the billet crank from Ken Keefer.We also have a question as to which rod to use a good steel rod or alluminun.we are think of using nitros on special occasions.

I'M GOING WITH A SET OF 6.7 OLIVER RODS WITH MY 535 IA2 BUILDUP FOR THE STREET AND THE TRACK MINE WILL BE A PUMP GAS MOTOR ON NITROUS

[9secdport]

i am more intrested in how high we can turn the motor and how much lift we can use without having alot of stress on the valve train

[Brian Baker]

Originally Posted by 9secdport

i am more intrested in how high we can turn the motor and how much lift we can use without having alot of stress on the valve train

I hear high rpm and nitrous...and I say aluminum rods are the only way to go. I only have experience with BME rods, but there are others out there as good, or better. I really like the GRP rods with their "radial serrations" on the caps and end of the rod. That's an ingenious little improvement.

Both Jack Gaydosh and Scott Rex are buzzing their engines to 8500 rpm without issues, so you shouldn't have any issues either with wanting to run a cam that doesn't require changing springs more than once a year.

Now the big question. How many cubes and how much power do you want to make? This is where cam and spring selection comes into play. You can't just pick the parts based on "what will last me all season" and throw them together, without knowing how much power you want to make.

[jack gaydosh]

With my tiger heads i run over 900 lift on intake and 850 on exh comp springs put well over 200 passes on the engine this year! tit vales int and exh 350 lbs on the springs. i only had to replace 12 springs all year and they only had dropped to 310 lbs. the cam is over 280 on int and over 300 on exh @ .050 hope this can help if you need more info you can call me at 410-303-6237 thanks jack.

[John Langer]

I'll go around 25 passes on a set of intake valve springs.

[jack gaydosh]

Is that going to be a square lobe john !!!