Originally Posted by getuted
...at the moment im after a 557ci kit, and some edelbrock heads. has any one heard any stories about this type of combo.... or if it even a good idea, because i kinda wanna keep it sorta realiable. has anyone got any tried and tested combos that they can give a good wrap, i don't really want to fork out big wads of the folding stuff for s*#t if ya know what i mean.
The 557 kit may surprise you when you build it because the 4.5 stroke crank pulls the piston out of the bottom of the bore so far that you can see the piston pins. This has not proven to be an issue or cause failure, though. Never-the-less, for this reason I opt for the 4.3 stroke 533. This option also has a better rod ratio resulting in less side-thrusting of the cylinder walls.
The 557 with Edelbrock heads is a good combo and has lived on a street engine I know of for a long time. Strengthening of the block is a must, with a main stud and girdle kit as minimum and 4-bolt modification even better. Block fill to the the waterpump holes is also helpful in supporting the cylinder walls, but beware that reduced cooling capacity will be cause for your oil to absorb more heat, so get an oil cooler to make up for it. A block set up this way should be good to 900 HP capability. Keep the motor in excellent tune to reduce the possibility of cap-walk.
I am of the opinion that if you have a standard bore block, build the 4.5 stroker to a .030" overbore 545 cubic inch engine, and save yourself the future overbores for long-tem use of the block. (A 4.3 stroke 533 would be a 521 at .030 overbore.) This also provides stroger cylinder walls, especially in an engine that has not been block filled.