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: heads usmcanglico Mar 5th, 04, 4:59 PM I'm undecided on which head to put on the 383. I have a choice between a 64cc 2.02/1.6 or a 76cc with 1.94 ect. Im told the 76cc head will put me at 9.5 comp and 420 hp. The 64cc will be around 10.5 at around 450 hp. m71 Mar 5th, 04, 6:00 PM aluminum or iron heads? what brand? what runner size? what's the rest of the combo, such as cam, convertor, gears, intake, carb, etc. usmcanglico Mar 5th, 04, 6:11 PM I have a th350 no converter yet. 2.73 open rear (3.31 someday)and havnt chose an intake or carb yet. Premium 4-Bolt main block. GM 350/3.750 con rods with NEW Pioneer HP rod bolts and nuts. NEW Eagle 383 Steel Crankshaft. NEW Speed Pro Hyperutectic Flat-Top Pistons 9.5:1 comp ratio. NEW Hastings Moly Piston Rings. NEW Speed Pro Camshaft & Lifters .468/.480 - 220/231 specs. NEW Fel-Pro Gaskets. NEW Melling High Volume Oil Pump. NEW Clevite Rod,Main & Cam Bearings. NEW Pioneer Flex-Plate & Harmonic Balancer. New Cloyes Double Roller Timing Set. NEW Brass Freeze Plugs. Heads Premium castings.6 or 7 Hole Exhaust.#416,434,450(early style) These heads are cleaned, inspected & magnafluxed! These heads are machined on a Peterson seat & guide machine using Serdi 3-angle tooling (No stones). We unshroud the combustion chambers & bowl hog the seat pockets. We machine & install thick wall valve guides (No liners). The heads are surfaced on a Storm Vulcan surfacer using CBN cutters. We install NEW stainless steel swirl polished 2.02 / 1.60 intake & exhaust valves, NEW hardened retainers, NEW valve locks, NEW hi-pro valve springs(max .510 lift) & premium Viton valve stem seals. All of our cylinder heads are vacume tested bigjimzlll Mar 5th, 04, 9:49 PM if they are telling you 420HP..get it in writting and make them verify it..... h usmcanglico Mar 6th, 04, 12:31 AM Are you saying that with the specs advertised the HP is not possible. I'm curious, because I've looked at several 383's and have been told different HP ranges from 330 to 450. What should I asked for for proof, so I dont come across as a sucker. bigjimzlll Mar 6th, 04, 1:07 AM Thats a mild combo with stock heads..1HP per cubic inch is pretty lofty...its the best GM could do fo many years..at 420 your looking at 1.10hp per cubic inch. Now with a set of vortec heads or nice aftermarket heads 420HP would be is more easily obtainable usmcanglico Mar 6th, 04, 2:24 AM That was my next question. Stick with the short block and pick up some vortec or good darts down the road. The short block will run me $1700 and they offer a decent warranty | ||