Well, we're all talking about winter projects now. Mine will be a new engine for the chevelle. I have wanted for about two years now to build up a 496 stroker engine. But lately, I have read up a lot on supercharging. If I went that route, I want to go with a ProCharger unit, under the hood. No intercooler for now, and I dont want to run much over 10 lbs boost. They are giving really impressive results. I have always been a fan of slightly higher compression...maybe 10 or 11 to one...and I also love the big cam, erratic idle sound. I can have that with the stroker, but from what I have heard in person, and what Im reading, supercharged engines have a much smoother idle. So now I dont know which way to go. This will be a street ride, not a race car. It may see the track a couple times just to see what it will do. Does anyone have any experience with centrifugal supercharging, and if so, what are some pros and cons???? John

Big difference in the cost. How much you wanna spend?

I didnt see a huge difference in cost, of course it depends on what you buy. The ProCharger base unit im interested in is about 2300.00, and Im sure there will be a little more in added items. The stroker engine should come in at about the same, using many of the parts I already have here. I basically need a crank, rods, pistons. I have the block, heads, a roller cam, etc. Im not considering the cost as an issue in my decision, Im more concerned about performance, and will I be happy with whatever I do.

If you don't mind the details of the accessory drives and making a nice package under the hood, hands down - supercharger. A centrifugal supercharger on a 454 based motor will be incredible. But don't forget to factor in a completely different carb set-up and also the expense of dealing with your brake booster. The periferal expenses are probably the biggest deterrent for most guys. But if you want to do it, there is not much more visual "wow" factor than the hightech look of a modern supercharged engine.

the guy thats building my 505 said "you're buying all new rotating assembly anyway",,,for 350 more go with the stroker crank. I like n/a cubes myself,its just impressive.

edit: engine will be done 12/15,gonna get a 10 second time slip :D

Robert,

I thought you were building a 468?

Are you still planning to go ovals with the 505?

Grn69chv, what do you mean about the brake booster. And I thought the carb modifications involved the floats and one other minor thing that I cant remember right now. :confused: What other periferals do I have to consider?

Originally posted by Johnny O:
Grn69chv, what do you mean about the brake booster. And I thought the carb modifications involved the floats and one other minor thing that I cant remember right now. :confused: What other periferals do I have to consider? Sounds like you've been talking to ProCharger! There's more to the mods of a blowthrough carb than you can do yourself. Figure $350 or so to have it professionally prepped and be done with it. The metering blocks,air bleeds,boosters,etc. all get changed/re-worked in addition to different floats and milling the choke housing off. With a properly modified carb they run awesome.

Jody

Johnny, with a blow through carb, there is a fair amount of setup to get the carb working correctly, IMHO, better done professionally. However, you will need a vacuum source for your power brakes and also trans modulator, which will not be available when you pressurize the intake manifold. Unlike a roots typre blower, where you can still get a vacuum source off the carb, centrifugal superchargers don't give you that option, so you need an external vacuum source, either an electric operated vaccum pump or a belt driven one. Its not a huge deal, but still something to factor in. Don't know the hard numbers, but I'm guessing 300.00 - 500.00 for a good pump.

I run a blow through procharger and I still run my PCV and my trans Modulator off of the carb and it works fine. Even though there is pressure in the carburator you still have vacuum as there is a pressure drop through the carb, otherwise the carb would not meter fuel. I have a boost/vacuum gauge and I have 11" vacuum at idle and about 20" at part throttle going down the highway (once the secondaries open up it goes to boost real quick). I don't know if it would be enough to run power brakes as I've never had power brakes.
I had my carb prepped by SD Concepts and its always ran great,of course I've played with the jetting to get it where I want it.

For some good info on prepping a carb for blow through read the article here: http://www.hangar18fabrication.com/blowthru.html
There are guys running some impressive numbers with just these modifications.

Darren, the machinist talked me into it...350.00 more for a stroker crank and I couldnt pass it up,its all going to be new anyway. Yes I am going to use the 781's he took them apart,did a lot more porting and installed 2.25 intake valves also. So now I have to start thinking, axles,rollbar,flexplate shield. I told him I wanted it to run on pumpgas and I wanted a 10.99 timeslip,and I'm thinking I'll get much more than that if I can get it to hook.

Thanks Robert, been thinking of starting to piece together parts for my next rebuild (stroker similar to yours) but I'm curious about what kind of rpm's a prepped set of ovals will provide to a 500ci motor. 6000??

John, I apologize for hijacking your post.......sorry. smile.gif

If it were me I would build a stroker motor and throw about 150-175hp worth of N2O at it. Much simpler. graemlins/thumbsup.gif

I will have a self imposed redline at 6000-6500,with 2.25/1.88 valves,performer rpm, all gasket matched, and Eds version of the XR 286 Comp roller on a 107 lsa. I think it will be fine,and so does the builder. 4.25 stroke/.100 over/long rods./11-1 max comp.

Sounds alot like what I had in mind for mine, 6000-6300 rpm, 4.25" stroke, 2.19/1.88 valved, ported '049 ovals, 10.5 SCR, an Isky street roller (248/252, .602"/.646", 108LSA), RPM-AirGap & HP950. graemlins/thumbsup.gif

Lets meet in St.Louis and line em up :D graemlins/thumbsup.gif

Originally posted by Rapid Robert:
Lets meet in St.Louis and line em up Everybody knows my stick car wouldn't stand a chance against your automatic. ;) :D

Oh sure you'd have a chance, that blue bottle would help you catch back up :D and maybe go flyin by.

Can my First Gen. join in on the fun??

pdq67