You already know how to build engines, why not go the proven route that you already know......CUBIC INCHES!!! We turned 500EFI's into 540's this past winter and except for some issues we created ourselves they have been running great.

Wouldn't he have to boost reference the carbs as well. Different powervalve, run a vacuum line from powervalve chamber to intake and install high speed air bleeds? Isn't 9.5 too high?

525 SC is the 454CI and the 525SCI is the 502CI. I am also considering using the 525SC supercharger on my 454 as well. Keep us updated, I am also interested. I am running 9.6:1 compression and have been told that 3lbs of boost would be fine.

go with at least the 250 or 420 blowers a friend on here had a 509 closed cooling 250 blower ran good. now he has a 1071 with cooler 572:D oh the 250 set up is up for sale I think. art

t500hps - Money, the answer is money. If I could allow myself to drop 10k a side cubes is where I would be!

mh3591 - Carbs included in the deal are original 1050 dominators with the 525sc blowers. Supposed to be boost referenced. I'm not entirely sure what that means but it sounds cool :cool-smiley-011:

pkspx - It may be a while, but I'll try to let you know if I end up with a grenade. I guess if the boost is reasonable, the engines should last, but that is heresay.

AIR TIME - I'm green at this, but with my already too high of compression I think the 177 will have plenty of capacity. I'm sure the next round will have more serious huffers :cool-smiley-026:

BT

Unless you plan to lower the compression, I would go for the 177 blower (less HP to turn than a bigger blower). I built a HP420/525SC clone once with 8.75:1 and 5psi boost w/o chiller. Sweet package.

bl

Sorry for the ignorance, but is a 525sc charger a 177? What does 177 stand for? Is it cfm?

BT

Yes the 177 is the supercharger on the 525SC.
177 is the volume of air it moves in 1 revolution.

rdoactive, thanks that makes sense.

Ok, should be getting my new parts any day. I am curious about the last sentence above and if I am on the right track to prevent holed pistons.

> Oil temps are good now at 205 cruise, 230 after hard running.
> Closed cooling with aluminum heads. Normal water temp is generally about 125f, both engines with only restrictors for tstats.
> Fuel pumps are stock merc. I suspect this is a problem. I intend to replace these with 100 gph pumps or thereabouts. Recommendations needed. Lines are all 8 or 10ANs.
> Ignition is stock tbolt IV. I do have some MSD ignitions I used to run but prefer to stay without. Module is a 24 degree. I assume the tbolt is good as is and intend to leave it alone.
> Quench is .037" with the pistons down .010 hole.

BT :cool: