I curently drive a 305 tpi 91 Z28. I descided it was time for a new motor. I want to build my self a 350 I was thinking of going with the iron vortec heads and the scoggin dicky intake only problem is I am not sure what year block to look for i dont know if i should go 2 or 4 bolt main and I dont know like how roller set ups are in older blocks. I was wonderng if anyone would recomend a year range block to use, and a casting # for the vortec heads becasue i know there are a few, and if anyone recomends a cam i hear the zz cams are nice. im looking to put out at least 300-350 horse thanks alot -Pat

 

Make sure that the block you get is between a 87-92 block. If its older than 87 you won't be able to put you accessories back on the motor. The bolts will not line up for any of your brackets, and its pretty hard to have an alternator on a belt without anything to keep it in place. Also an older block will probably require a new intake and some extra $$ to retro-fit it all.

 

No, those things don't have anything to do with the block! Those are HEADS issues!

The only difference as far as the block is concerned is one- or two-piece rear main seal, and driver's- or passenger-side dipstick. Get the right flexplate, the rear main seal issue is resolved. Use headers, the driver's side dipstick issue is resolved.

Are you sure about using those Vortec heads? Do you know what you have to do to them to put a decent cam in it? If not, get the August '02 Chevy High Performance magazine, they outline it very well (finally admitted the Vortecs aren't a bolt-on performance head as-delivered). For the cost of that base (assuming you don't want an aftermarket base, just one that fits those heads), you could get some real aftermarket heads that have aftermarket castings, and are delivered ready to support performance camshaft lifts.