How much power would a built 305 with a smog-legal Wieand blower and a shot of nitrous make? Anybody do this yet?

 

Which 305?

 

8,500 horsepower.

 

thats kind of broad. there are so many factors such as what kind of exhaust, intake, heads and such. try breaking it down with more specs and someone would be willing to throw some numbers out there. you didnt even mention how much nitrous you were talking about.

 

SLP 1"3/4 Headers, 3" exhaust, Flowmaster muffler. A NOS 4500 dual stage plate system and a WIEAND 142 blower running between 4 and 6 pounds of boost. How much HP would such a set-up be worth?

 

this is what you make

 

ROFL!

serisously dude, you can't run a 4500 series nitrous plate on a 142 blower, it has bosses for a 4150 series carb. do some more research and come back when your better educated.

 

hey in all due respect and for the sake of this guy he may not no such things as this but you say to come back when more educated but like so many of us is there any way to get more educated then from thirdgen.org. i mean there is a lot of us that came through here with little or know knowledge and after being here for a while its no longer the case. my advise is just to go about this a different way. i suggest searching more. its a wonderfull tool. search about each mod you just listed and get as much information as you can when you feel like you have learned as much as you can about something by yourself then ask questions. but try to be more specific about it. this is all my 2 cent though. doesnt mean squat.

 

sorry, your right, you caught me at a bad moment this morning.

ok, you have an early carbed 305. what do you want to gain out of this motor? the 305 can be made to run well, i have an n/a 305 that i drive everday run as fast as 13.75@100.5 mph.

if you want ultimate power, the 305 is not the way to go, you need to go with a bigger bore motor so that you can get some decent heads on the motor that will flow all that air.

if you want something fun to learn with, than the 305 is a good starting point, but to get it breathing better, instead of slapping a blower on it and forcing air through, go ahead and get a cam and do a full exhaust. the 1 3/4" slp is a little much for an n/a 305. i my self have hedman 1 5/8" longtubes, but i am sure you want the ground clearance shorties offer so i would suggest getting the hooker 2055's, coated if your budget allows. get a set of under drive pulleys, they take drag off the motor. basically, you want the motor to be able to move as much air going through as possible with as little strain on the motor as possible.

how many miles are on the motor? if it's about time to rebuild it, than i might look into a 350 if i were you. you can find 350 cores for dirt cheap. just gotta look. if you are hell-bent on the 305, than listen up, i am about to tell you how to get some serious power, cause i was hell-bent on mine too.

do a basic rebuild using quality parts in the bottom end, if the bores are scored, get it honed or bored if needed, by new pistons in the 9.5:1 c/r range.

get a set of 416 casting heads, yours may already have them, look in the rocker arm area, there's a number stamped in the valley there, last three numbers being 416. work the heads over with some porting and polishing. there are many threads in here about how to do that. get a set of 1.94/1.50 valves put in with all new valve guides/seals/etc.

get a good sized cam and buy that same manufactorers springs that they suggest, using stock springs will only cause binding and other problems down the road. the XE268 or XE274 cams from Comp Cams would both be great for this motor IF the heads will flow it. obviously replace the timing chain too. the Comp Cams kits come with cam/lifter/timing chain/valve springs/retainers/locks.

roller rockers would be in order here as well, i went with crane cams energizer aluminum roller rockers

a good intake manifold like an edelbrock performer rpm or a holley street dominator are great. carburation should be a 650 holley double pumper.

hedman longtubes with true dual exhaust in the 2.5" diameter variety.

get a converter built to cam specs and a tranny to hold it, a well built 700r4 will work just fine.

3.73 posi rear end would be great.

this combo should net you LOW 13's HIGH 12's without much of an issue, if you want to go faster than that, THEN look into your nitrous, or blower. a blower with 6psi on that motor above with a cam tailored to the blower, would put you in the mid/low 12's, i think.

 

great post and good advice. i would recomend going at it slowly get some track time in now while its slower and progress as you go. dont forget after you start getting some power to get some suspension and chassis work done. get sfc soon. start with those basics that mw66nova listed. you should be very happy with what you get. plus you motor will be much more reliable than it would with that blower and a pile of nitrous.

 

Thanks for all the advice. I just rebuilt my 305 10,000 miles ago. he said it was a stock rebuild, but the cam is slightly more aggressive than stock. We put an Edelbrock performer EGR manifold on it with the stock compu-Q-jet, then followed up everything with SLP coated smog-legal 1 3/4 headers and a 3" flowmaster exhaust. I have a dual snorkel aircleaner with a K&N and hooked them to mini scoops on the hood for cold ram-air. I think the rear gears are 3.23. I'm in Cali so, I must remain street legal at smog time. That's why I was wondering about the smog-legal blower.

 

don't ya'll have a visual inspection? don't think it will pass on an f-body.

 

i just so happen to have a dyno chart of this exact motor:

 

We do have a visual inspection and the edelbrock performer egr passes it because it retains the EGR smog crap. The Wieand blower I was looking at awhile ago had a CARB approval and EO #'s stamped on it, somehow it must use the EGR too and factory carburator. I think to be legal though, you would have to have your stock aircleaner floating above the hood with hot-air (thermac) tubes reaching down to the headers. That would look awful!! LOL!!
I like your graph, very helpful!!

 

I think I see some kind of message from the other side here...
Does anybody else see it?
IT'S.... IT'S... OMG!!!! AAARRGHHHH!!!!
GURGLE
GLUB
glub
gggggggggggggg glub* * * *

 

LOL