Another way to think of a blower motor (roots style) just ads Cubic Inches to the motor anyway.

Believe me, I love big cubic inch motors. But also when you go big cubic inches you have more weight in the rotating assembly, tighter clearances, and if its not balanced it will blow up. Out of all the fastest offshore boats made, what do they use. Most of them to my knowlege are supercharged.

Large cubes sound awesome at idle!! But the sould of that blower whining also sounds awesome!! Its up to you, there are pro's and cons with each one. Personally I would go with the Blowers, parts are easier to find.

Are other people getting "“power is power� " When they read Dean's post or is it just my 4 computers? I first thought is was my computer but have been on others & they are the same way.

sorry, that’s what it says.
i’m sure that is REALLY bad terminology but i couldn’t think of a better way to say it.
what i am meaning is, that just because an engine is supercharged shouldn’t automatically equate to more engine wear. all other things being equal, it takes the same amount of f/a mixture to make each hp whether it’s sc or na. so if you’re igniting the same amount of f/a on top of a piston (whether it’s pushed in by normal barometric pressure or pushed in mechanically by a sc) it’s going to drive the piston down with the same amount of force. the sc obviously does produce an amount of drag on the crankshaft, but from what i understand it’s minimal (less than 7% @ normal drive ratios).

Dean- What I am getting on my computer when you post is all kinds of weird hash marks, squares & other weird symbols in the middle of you posts. Looks like you are posting in code. That is what I was referring to. I just cut & pasted what I saw on my computer. "power� " is translated on my computer as the word power with some weird marks with a square at the end

Sorry, I guess I did not make myself clear enough.

jdnca 1

How many hours do you have on the Schubeck lifters? What valve springs are you using and why do you have to change them after 50 hrs? Please let us know how it works out.

JimV;

I only have about 4 hrs on them so far. I broke my last roller lifter after only 7 (broke the lower body just above the axle out) so we'll see. I think idle time and "too much" spring were just killing the traditional solid rollers. I got about 45 on the set before that. (needle bearings) I was running the comp 948-16 springs which are 340# on the seat and close to 950# opening. This time around I went with an the Erson E915170, they are 280# seat and around 780# opening. The Schubeck lifters weigh less than half of a regular roller lifter so you can get away with a lot less spring. I checked my original springs after about 55 hrs and found they were sagging by about 20% on the seat so I thought it was time to change them out. Initially I went with the comps again, but then broke my last lifter and switched to the Schubecks and lighter springs. Joe claims I should not have any more issues with lifters or wear to worry about for at least a few 100 hrs I'll believe it when I see it. and hope he is right. Big duration/lift solid rollers won't live in the marine environment in my opinion and based on my experiences. I think if you keep max lift in the .700 area with durations in the 260's to mid 270's with relatively light springs and limit idling a solid roller will work just fine. The 502 I had in a previous boat, ran a solid roller 252/258 @.050 .680/.708" on 114 cl and had no issues in over 60 hrs.

jdnca1,

What diameter lifters are you running? The last price list I got from Schubeck only listed .842 diameter lifters for BBC. Is this the same size you have and do you know if does he offer larger lifter in the radius style for the BBC?

Wette Vette,
Can you expand on the problems that you have heard about with the Big Chief heads?

Thanks

Dick

Cubes or Supercharged

Either way it looks as if you will be going around me THIS year

Don't forget it cost horse power to turn the blower.

thanks every one for your replys. i believe i am going to use my current 540 block and crank and go with the procharger. any more replys would still be greatly appreciated