'79 f 350 4 sp clutch hp rating

just bought a '79 f 350 4 speed 4x4, originally came with the 400 motor, i took it out and put in my 1970 460, not much done to the motor little porting on the exaust, cam, headers, im thinking around 425hp, anyways i got everything together and took her out for a drive took off in 3rd gear and mashed the gas and felt the cluch slip like crazy, no its not new,its not in ''horrible'' shape either tho, i thought it would hold up but apparently not, so i was wondering if i ordered a new stock clutch, would it hold this power level, ill be running with a set of MT 39x18x15 tires also, any advice is welcomed
-Wes

What flywheel are you running currently? Is it a diaphram Pressure plate?
If it is a 360/390 flywheel, and an 11 inch clutch, put a 11inch Ram Metallic button disc in it and a heavy diaphram P/P and you should be fine. I am running an L&L conversion 12 inch clutch with there Metallic button disc at about 500 HP truck pulling and holds just fine, I even slip it off the line. I think you can buy the entire L&L kit, flywheel included for around 650.00. :D

wow thanks alot man, i went to that L&L site http://www.landlproducts.com/list.aspx?Mode=List&cID=7&scID=131

they actually have the conversion kits for the 351m/400 bell housing to the 429/460 that 12'' clutch pressure plate assembly sounds great, and for $375 i can't compllain, now i just need a flywheel

okay they also sell a complet kit 1978 & Older 429/460 Engines Internally Balanced 40lb. NHRA approved machine steel billet flywheel H.D. Pressure Plate H.D. Clutch Disc Roller Pilot Bearing Flywheel Bolts and Clutch Bolts This Flywheel assembly will fit inside the stock 351M/400 Bellhousing. Specially designed for 429/460 Engine Swaps in Trucks and Broncos. $600

http://www.landlproducts.com/list.aspx?Mode=List&cID=7&scID=128

That would be the one. Just make for sure when you order it you order the one with the metallic button disc, DO NOT buy the one with a normal organic disc, it won't hold.

haha yeah that wouldn't be no good, any idea on just how much this clutch setup will hold? im not worried yet but possibly down the road if i do end up building up this motor for some more power

Not real sure, I don't think I would be afraid to throw 600 HP to it.