dmccain

iTrader: (2)

I have an older non roller style 350 block freshly bored .030 over. My heads are stock 083 L98 iron heads. With hypereutectic flat top pistons, stock crank, rods etc.. hydraulic flat tappet cam with around 218int 224exh @50 with around 470 lift , a good intake and holley 650 DP carb what sort of HP should I be looking at. Car will also certainly have good headers/y-pipe 3in exhaust. 2500 stallTorque converter and 373 gears are also in the future. Im hoping a good street engine I can blow cold a/c with no drivability issues and maybe run some mid-high 13s on occasional trips to the dragstrip

Orr89RocZ

iTrader: (20)

That will be mid high 13's easily. Those heads can make 350 hp on a bigger cam setup. You probably closer to 320 flywheel

z28yourstang

iTrader: (1)

Definitely capable of what you want to do but if the heads are off it wouldn't hurt to gasket match the intake ports to a fel pro 1205 intake gasket and radius the exhaust port....the 083 has a terribly misshaped intake port

dmccain

iTrader: (2)

Ive built a similar combo using vortec heads before and it done really good but for such a mild build and being I can get my hands on the 083s really cheap i was hoping and really expecting to get this kind of power. Thanks guys.

Fast355

iTrader: (2)

Years ago HotRod magazine pulled a 350 engine out of a 76 Impala and did some testing "Junkyard Jewel". They used 083 TPI heads and a Comp XE268 and made 320 HP. Switched to Vortecs and made 375.

dmccain

iTrader: (2)

Another question and I really do appreciate you guys info on here as well. Will my serpentine belt system off my 89 L03 work on an older 350 block? My last few swaps were on v-belt belt systems they used up til 87 I didn't have any problems.

dmccain

iTrader: (2)

Dang fast 355! To leave 50+hp on the table may sway me into going with the vortecs again. Id figured 30hp or so. Im just getn a good deal on these 083s and have heard they are pretty good. If they made 245hp in an F-body with a choked exhaust system, lame cam, and an induction system which no doubt choked it down then I figured with a few mods and a good carb and intake it should do pretty good atleast put me in300-325 territory.

2005Impalla

Your set up is almost identical to mine but I have the vortec heads and a vacuum sec 670 carb and my cam is roller. My duration at 0.050 is exact and my lift is almost exact. I was also hoping for a mid 13 sec car and will be doing the 3.42 or 3.73 gears with a 2,300 stall. I think the 083 heads will be good if there all you have but the vortecs would be a little better. If you can get the 083s for cheep use them. I would guess you should be around 325 HP at the motor with your set up. I have not dialed in my car yet as it was just built or had it on a dyno yet but am hoping for around 275-300 RWHP out of my set up and around 325 to 350 FTLB at the rear tires. Your car should be pretty close to that too. I went with a vacuum sec carb and like it a lot but have not installed a stall converter yet. Your choice of stall speed is right in the middle of were either vac or mechanical sec will work good. If your going to drive the car on the freeway a lot like I am and be in overdrive most of the time the vacuum sec might be a better choice. One thing I did to try to get a little more low end you might want to do different is I went with a performer EPS intake which is probably leaving a little HP on the table. You might want to use a performer RPM or something similar. Another thing with the vortecs too is my heads needed machine work the fit my beehive springs due to the valve guide boss being .9" I guess not a lot of people have ran in to this problem but I did. I used the 906 castings instead of the 062 castings which might have caused my problem. So check the inside diameter of the springs you want to use and when you find a set of vortecs if you go that rout get a cheap caliper set to take with you and measure the valve guide boss to make sure every thing will fit. I think just the machine work would have only cost around $100-$200 but I had other work done and it was $580 total not including springs, retainer and locks on a new set of heads. I could have just got new aluminum heads after all was done. So do your home work before you get parts and make the same mistake I did. I don't think very many people run in to this problem but I did so just a FYI.