Originally Posted by billy boats

My old combo which ran GREAT!!!!! For 3 years before I sold it:
Gen. 6 454 .030 trw 2399 Pistons 8.8 compression
Bullet hyd roller .640 lift
Merlin iron heads 120 cc chamber 345 intake runner, 2.30 intake valve
Blower shop 250 No intercooler
Single dominator 1050
Thunder bolt 4 with V6 box
700 hp , 5800 rpm 5 lbs boost

7.5-8 compression with small blower will be a waste of time. Think of what that engine would make for HP if you remove the blower , 400 tops
In theory if you add 14.7 lbs of boost you double the HP, so at 7lbs you add 50% more. That makes the engine 600 HP , now take the parisitic drag of blower and heat caused by spinning that little blower SO fast to try and make 7 lbs. that's another 50-75 HP loss. So you left with 525-550 hp. Besides the HP numbers the engine will not be efficient at all.
The engine your looking for has been built for the last 25 years by every engine builder there is. Learn from other people's mistakes and successes.

Originally Posted by airjunky

With the gas prices down so much ill bet everybody now wishes spec for
93 octane . Who knows how long these prices will stay though.is this going to be run on dyno with wet exhaust ?

Originally Posted by ezstriper

the Merc 525SC only had about 7-1 and they ran well...8-1 will be fine with the blower

Originally Posted by airjunky

Lots of good points so far , prob should settle on your pistons and rings before you sweat the cylinder finish any more .prob wouldnt wouldnt theorize psi numbers too too much either .
a clean easy 5 psi through a efficient combo is as good as or better than 8 psi through a smog motor with a cam where the 3 psi extra is just bottlenecked boost and extra inlet temps really .
start looking for some extra pulleys now if you have the splined blower snout

Originally Posted by mike tkach

i just finished a build very similar to what you are doing,it is scheduled for the dyno wednsday.it is 1 of 2 for another oso member.it is standard bore 454,8.5 to 1 compression ratio,afr 305 heads and a bob madera cam.it has wet exhaust so the cam is pretty conservative and it has to run on 89 oct fuel.it has a 177 blower that makes around 4 lbs boost.i am looking for 625 to 650 hp but more important to the owner is reliability.add in,it has scat h beam rods with arp 2000 bolts because they did not cost much more than rebuilding the stock gm rods with new bolts and they are a way better rod.also has morell hyd roller lifters.imo this engine should go 250 to 300 hrs before it needs the isky valve springs replaced and hundreds of hours before needing a refresh.i will let you know how it does on the dyno if you are interested.edit in,im no expert but i did stay at a holiday in express last week.

Originally Posted by mike tkach

tom,the dyno sesion got bumped to today,just got back.it made 690 at 6000 rpm with a safe tune.i was expecting 625 to 650 so i and the owner am pleased with the results.