I have two options that i might be considering for a future build. I am currently running a setup that isnt living up to my expectations. Its obvious that my heads are not geared for for the rest of the build. So I have decided to go one of two routes. One would be to maintain the same setup but purchase a root style blower that would allow for the potential of the heads to be used while maintaining streetability. The other build would be a full roller 12:5:1 cr 383 that I already have the rotating assmebly for and cam, I however might question its streetability. Both of the builds are shown below.

http://www.chevelles.com/forums/showthread.php?t=192603&highlight=protopline

350 over (.040) with 4 bolt mains
forged pistons and chomolly rings
Crane hydraulic roller .539/.558 230/238 LSA 112 #119661
Protopline 235cc heads with 2.08 intake valves 72cc chambers
1.5 ratio RR's
victor Jr intake
Holley 750 DP
Ceramic coated headers
Maderal bent 2.5 duals with flowmaster 40 series mufflers
MSD 6AL ignition and blaster II coil, billet distributor, and 8.5 msd wires
TH-400 with shift kit and TCI Streetfighter 3200 Stall
Richmond 3.73 rear
*6-71 or 8-71 blower

350 stroked to 383
6 in 5140 connecting rods
nodual iron crank
JE SRP domed pistons (12:5:1)
252duration at .05 and .6 lift hydrualic roller 112lsa
heads and upper end is same as above as well as trans and rear end

This car will be driven about once a week on the street and maybe strip
let me know what you guys think

Those heads will still be big for a 383, and 12.5 to 1 is pretty wicked for a street car. If you're dead set on using what you have, then the blower on enigne #1 is probably better.

If you're open to a third option, make a 383 since you have the rotating assembly and use the crane cam from engine #1. Sell the heads, intake, second cam, and whatever else, and then pick up a set of TFS or AFR heads in the 190 cc range and have a strong street motor.

anyone else....which one would you think would yield better results?

On a street car, I would go with the blower. The blower may mask the fact that the heads are the size that they are. If you went NA with those heads, you would probably need something around 280 at .050 duration to really match them. The 252 @.050 cam is simply not a good match. It is too small. If you matched the cam to the heads, the stall you are looking at would not be nearly enough. Even though the heads would still be too big, with the blower, I think it would still be a fun street motor with the stall you have.

Adam

Option 1 would be a great candidate for the 6-71. You do not need to run an 8-71 on a 355. The heads are huge for either combination, and with low compression and huge intake port with a mcsa like that, you will need to run alot of boost to make any power.

Option 2 is a good start for a normally aspirated engine, however you wouldn't need to run 12.5-1. Makes less power than 13.5 and you still need to run the race gas. Either compression you go with, the camshaft in option 2 is wayy too small, and the heads are on the big side by about 20cc's and a much bigger mcsa.

What I would do:
Option 1, run the 6-71 with the 8.75-1 compression you will get with those chambers, run two well built 750's, and cruise it on the street on pump gas all day long. Then when you go to the track, change the pulley and put race gas in it and hold on. That will be your best bet for best of both worlds.

Option 2, Mill the heads to achieve 15.5 compression, cam accordingly (atleast 30+ degrees worth of duration and no less than .750" lift, and be prepared to shift this thing around 8,200 or so to take advantage of those heads.However I see the parts list you have for a rotating assembly and do not recommend this. Go with option 1.

thanks for the input....I guess what I should consider is should I just go ahead and sell those heads or keep them...On either build is it benifiting me by staying with them or should I go with something else. I supose my build doesnt necassary have to revolve around those heads.

I guess what I should consider is should I just go ahead and sell those heads or keep them...On either build is it benifiting me by staying with them or should I go with something else.

The heads are a big mismatch for your plans, IMHO. I say sell them and get something more in line with your intended usage. Keep and eye out for trades as well. There's bound to be somebody out there that got bit by the power bug, or is building a strip only car, that has some decent heads and would probably trade for yours.

OR pick and choose from what you have for what you need to build a BIGGER MOUSE MOTOR!! Then sell what's left..

I'd start w/ a stock blocked 400 and look at a 421 or a schosh bigger??

Aftermarket block, yes BIGGER!!! 440 or more??

And I wouldn't hy-roller it if you want to rpm her!!

Solid lifter cam for me! Or step up and go solid roller!!

pdq67