Originally Posted by CNC-Dude
Yes, the 250 is a contender for sure and often overlooked as an alternative. But again, right off the bat, most of the first half of your budget will be going into the cylinder head. 350 HP might not sound like a lot, but keep in mind this is just 250 cubic inches. A 350 will need to make 490 HP as a comparison to the 250 making 350 HP, so most if not any block prep mods you would do to a 350 for that power level, you would also need to do the same to the 250. Quality fasteners(ARP rod bolts, Main Studs, etc...)should be a part of your build also. You'll just have to shop smart and find bargains where you can on items like used Distributors, headers, valve covers, intake manifold, etc... and hold out for buying new stuff like pistons and cam and lifters, valves and so forth as you need to. If your starting from scratch without a lot of used pieces already accumilated, it would be hard to estimate how much a build would cost. But now that you see how you will need to prep it, it might give you some direction and a starting point. Hope that helps.
It helps alot. I remember back some years ago that we just cut out the bolt boss in the intake passages and replace the bolt with a stud and plugged the upper hole. It did help. But I see where you are talking about the replacement, with a "BUMP" I believe you called it, would make a much smoother flow,,hence more HP,,,,, Would you recommend a flat top piston and mill the head for more compression or use a domed piston. I think 10.5 would be sufficient for this horse power?? or should I seek 11.5 for this?? And maybe a good solid lifter cam somewhere around .550 lift w/320 dur ???? 2800 to 6000 RPM??? Maybe a 650 Holly or 3x2's. I do want to run pump gas