IboughtA3rdGen

Hi all!! New to the Forum/3rd Gens. Have an 82 Berlinetta with a stock 350. Found an engine with these upgrades: 30over, MSA rod bolts, gear drive timing, Comp 498/510 cam, 1.6 aluminum roller rockers, Edelbrock performer intake, holly 750 vac. secondary carb, cheap headers, 461 double hump heads milled 0.20 with 202/160 valves and Z28 valve springs. I bought it and got it installed. Its not ready yet as im doing rearend and suspension work but does this sound like a decent setup? he claimed 425hp or was I BAMBOOZLED

IboughtA3rdGen

Somebody? Anybody? Guess not?

Eric-86sc

iTrader: (18)

Welcome to tgo. I'd take a guess at around 350-400 if it is tuned right. I would find it hard to believe over 400 with camel hump heads unless they have some nice port work done. Hopefully the heads had hardened seats installed or at least stainless valves. Otherwise it sounds like a decent setup.

Zeifer

Honestly I'd replace the carb with one that has mechanical secondaries.

IboughtA3rdGen

Im not sure on the heads having any major work done to them. What suggested heads do you think will give me the optimum performance for this setup? Better yer will these heads hold up if properly machined and set up? I recently bought an 3001 street dominator(holly) intake so id have matching intake and carb. Im mew to the carb world Zeifer i read these were pretty good, whats the deal with mechanical secondaries?

1991sleeper

iTrader: (-3)

That's the cams lift which don't tell us much .. need duration specs

91' firebird .. 305 TBI .030 over , balanced bottom end , speed pro hyper flattops , 10.6:1 CR , all ARP rod bolts and main studs , melling HV oil pump , trick flow super 23 175cc heads, Howards HR 214/218@.050 .488/.495 lift on 114 LSA , full roller 1.6 RR = .520/.528 lift , summit dual plane intake port matched , shorty headers into 2.5" Y w full 3" flow master system and 3" cutout in front of axle , msd billet dizzy, 620cfm TBI , custom CAI , tubular adjustabke LCA pan hard , umi torque arm wonder bar , BMR trans cross member , COMP engineering SFC's, disc rear w 4.10's, drilled an slotted rotors, EBL flash , VRFPR, WBO2,

IboughtA3rdGen

1991Sleeper i have no clue of cams duration. What are the tricks to find out? Heres a video if its an buy ear deal...not timed correctly yet...

Zeifer

Vacuum secondaries have a delay to open up. The primaries open as soon as you stomp the gas, mechanical secondaries work the same way. So you mash that gas pedal and, bam! Instant power.

You can also mess with the springs in the distributor so the vacuum advanced timing kicks quicker.

Eric-86sc

iTrader: (18)

The heads you have are not bad, just old technology. They are from the 60s when leaded gasoline was the only fuel avaliable. If your heads where just a stock rebuild you will have to use a lead additive to prevent burning up exhaust seats. If you have the cash any 180-200cc aftermarket head such as dart iron eagles, worlds, afrs, etc will give you noticeable gains in power. Even a set of modified vortecs would be better than your old heads.

IboughtA3rdGen

Thanks just the type of information i needed. Ill be checking out new heads and carbs. Im hoping to make at least a low 12sec(1\4) out of this car on motor.

scamaro355

With slicks and a 150 shot you should hit low 12's easy

IboughtA3rdGen

Have the slicks already and ive been back and forth between going nitrous or turbo. I know more about nitrous than turbos. Really really leaning towards the twin exhaust turbos...looks freaking cool and ive heard good things about them.

Zeifer

Gonna need to spend some serious cheddar for a twin turbo setup that's worth it. And that's not including the conversion to fuel injection and having the computer tuned.

Honestly if you want to boost it I'd go with a supercharger, they're more plug and play. Plus, dat supercharger whine.

1gary

The cams for any kind of boost are different.You absolutely have to know the SCR to boost anything.It is must do.The heads are the choke point.With "heavy" machine work done to them,it is a open question if they would hold up under any serious boost application.And if the block was decked or not certainly plays a role in what the SCR is.Let alone what is the camber size of the heads and the piston type.When I say type of piston I also mean if it is a cast piston or forge piston or not.That knowledge of a question of a cast piston and the DCR would also include using nitrous.

The bottom line is you have to know exactly what you have and then a head/cam swap in my opinion is a must do.Even with a boost situation the heads are going to be the choke point.Beyond that then the exhaust needs to be considered.

IboughtA3rdGen

Yea i have 85 Irocz that im cleaning up in hopes of getting a little cash from to help fund this new project. I like the simplicity in a supercharger but but know nothing about them as most ppl here run turbo/nos.... @1Gary this isnt going to be a throw as many parts at it type build im just getting started. Plan having a fresh engine build in play while i play with my current setup til it blows....Suggestions on crate engines and cast blocks sb350/sb400 either will be stroked... Again im new to the older builds as ive always had ls1s to throw bolt ons, a chip and tuner + Nos to stomp the boys with...Now im into the actual mechanics of it.

Sam L.

okay you can make some goog power with camel hump heads ive done work on them my whole life and all my engines have made over 450hp at the flywheel now im not saying there the biggest head out there but there definetly easy enough to work with

DeltaElite121

Not with the low lift cam he's got. Going to need a lot more lift and duration in order to pull that off with those heads. I'd guess that motor makes somewhere in the 320-ish flywheel HP on an average setup.. more of it's optimized, but not a whole lot more.

edit: you can tell that cam is mild just by listening to the exhaust note. That's not 400 HP.