I have searched for threads on using main bearing spacers to use small journal cranks in medium journal SBC blocks, but cannot find any comments on how reliable the motor will be using these main bearing spacers.
Do you sacrifice reliability at high rpm's using bearing spacers? I want to use a 283 crank in a 4 bolt 350 block and be able rev safely to 7000-7500 rpm's.
I plan on using the original type Z-28 pistons (on 70 or 72cc heads) and the original solid lifter Z-28 Duntov 30-30 cam. I figure if I use larger chamber aluminum heads I will get about 10.3 to 10.5 c.r. and be able to use 93 octane pump gas.
For those of you who wonder why a 302, the motor is going in a 1972 Porsche 914. This was the mid-engine Porsche that used the engine from the Squareback VW. The stock transmission cannot take a lot of torque at low rpm's so I need an engine that makes power at the top end. The car weighs 2000 lbs and is geared low for the air cooled 4 banger that came in it. With the SBC and radiator it will weigh about 2300-2400 lbs.
Do you sacrifice reliability at high rpm's using bearing spacers? I want to use a 283 crank in a 4 bolt 350 block and be able rev safely to 7000-7500 rpm's.
I plan on using the original type Z-28 pistons (on 70 or 72cc heads) and the original solid lifter Z-28 Duntov 30-30 cam. I figure if I use larger chamber aluminum heads I will get about 10.3 to 10.5 c.r. and be able to use 93 octane pump gas.
For those of you who wonder why a 302, the motor is going in a 1972 Porsche 914. This was the mid-engine Porsche that used the engine from the Squareback VW. The stock transmission cannot take a lot of torque at low rpm's so I need an engine that makes power at the top end. The car weighs 2000 lbs and is geared low for the air cooled 4 banger that came in it. With the SBC and radiator it will weigh about 2300-2400 lbs.