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To get 400 HP out of a 347" (340 +.030") requires that it makes 1.153 HP per cubic inch. However if you had 416" engine you only need to make .96 HP per cubic inch to get 400 HP. That said it all boils down to the amount of CFM your heads flow as to what kind of HP you can extract out of a...

Based on everything I read I would go with 3.23 gears. Best compromise of all ratios. Tom

I could sell you SI valves, but the intake and exhaust 2.14" & 1.81" are currently sold out for a few months. Honestly your wasting your time installing big valves on that small a cubic inch engine. You're going to lose the most important part of the combination. AIR SPEED! I have a 499RB...

Running a spool on the street is very hard on the tires going around corners. Honestly it takes the joy out of driving a car on the street. For street I like a Powerloc (Best posi that uses clutches) or the ultimate is using an all gear driven Detroit Truetrac. Tom