i have a 70 340 block im building a race motor does anyone no the horsepower limit to these i will be running nitrous

 

Not familiar with small blocks,but I do believe 550-600 HP is for a stock block,They have thin cylinder walls and are prone to crack,also use main studs and a girdle for NOS. I am sure you will get more opinions,so be patient for replies.

john

 

thats what i thought my dad said i could cement half the block and i could still drive it on the street weither thats true or not cause id like to drive it on the street as well

 

I would NOT cement the block on a street motor. That is perminate non reversible

 

HP is directly proportional to $$$$$$$ and the skill of the builder !

 

Forgive me but.... What is cement(ing) the block? Rick

 

My 340 rollor motor with .534 lift roller cam produced 435 horses. In my Dart it would smoke the tires all day long. You will need a forged crank and forged pistons to shoot to it along with the before mentioned billet mains and girdle. I wouldn't shoot nitrous to your 340...get you a 360 and stroke it out to a 408 and shoot some nitrous to it. Save the 340.

 

to the best of my knowledge, it entailes filling the water jackets with a cement like material to strengthen the block.

for obvious reasons, the block is only a race block now.

i believe that modifying of the heads must also occur to allow the coolant to flow in there.

 

Thank you!

 

yea im not gonna cement it at all i got diamond flat tops with gas reliefs h-beam forged rods with a steel crank its gonna have 13:5:1 with indy heads she oudda run good i told the guy at indy i wanna run 10s on motor and 9s on spray

 

get a r3 or r4 block and your hp dreams are limitless lol 2000hp handling i belive.