Originally Posted by Hawk
Gesh! Thanks for ruining my fun TH i was getting there just wanted a bit more info b4 i made a sugestion.
I agree even for 500+ hp for peace of mind and being set for further modifacation in the future if running a late model block run the supports u can get but buy the time uve paid for all that mechining and parts and work its prolly more worth it to buy the boss block or a dart splined 4 bolt main iron 351w block for 15-25hundred theres a real nice fuel injected 8pack looking intake for them to that just looks ba. Most 427 w fuel injected engines ive seen put out between 550 and 585 crank hp so to get to 550 rwhp ull want to tweek a few things like an agressive cam maybe trick flow heads high comp pistons high octain gas maybe a few more things but ya just start with a good block then u aint got to worry at all and u can really go any direction as u choose to.
Sorry, That was not my intention.
Got a link to that fuel injected 8 pack? I'd like to see it.
The base 351W is considerably stronger than the base 5.0 and I have read numerous times from various sources that they will handle around 600 HP with just good forged internals and a good tune.
Adding the Main Support System from DSS will strengthen them past that estimated limit.
It ties the bottom of the block/main caps together and being made from aluminum it also serves to dampen harmful harmonics. It is a bolt on system that requires little to no machine work. The only machine work that may be required is clearancing for some stroker combinations. The main support runs $330 & the windage tray is $120 for a total of $450
Adding the Valley Girdle Pro will take the block a bit further by strengthening the top of the block. It does require a bit of machining, but nothing more than some drilling, tapping or light grinding at most. The valley girdle runs $250.
Those parts add $700 total to your engine block cost, IF you buy them new. I got lucky and managed to get the Main Support and Windage tray new and unused for $200 from people who bought them, but never used them. Patience and LOTS of looking paid off for me this time and it could for you too. So far I have not had the same luck with the Valley Girdle, but I have not given up yet.
Note: I was not overly impressed with the machining on the DSS Windage Tray. They left a lot of machining flash on it that will have to be cleaned off before I can use it. When I tried to talk with them about it, they would not answer my emails. Certainly not the way to treat a possible return customer eh?
As you can see if you have to pay, say $300 for a used block, then $700 to buy the girdles and windage tray, you are already at $1000, by the time you add any machining needed for the block you are probably getting fairly close to the $1600 Boss 302 or $1900 Boss 351W block. However, in my case and I'm sure in a lot of others too, it is much easier to come up with the money a little bit at a time than all at once. I tried saving long enough to get to all the funds together for a Boss block, but something would always come up and the money would get spent on something else. So necessity is the mother of purchase quantity and timing in my case.
All things being equal, you never "really" know how much a stock block will hold until you have exceeded its limit. All we can do is make our best estimate based on what's been achieved with them already and the information we are given by aftermarket providers.
"You spends you money and you takes you chances."
That's how I've heard it put more than once for many different parts over the years.
And you know what? There's a lot of truth to that.