I picked up a 460 block last weekend so now the project begins. I need help with a few things (lots of things actually) to figure out where to start.

I plan to stroke it 4.5" and bore .30 over (545). I'm pretty set on strapping a Dyers 8-71 blower to it. I'm trying to figure out what I'll need to do to make this blower work reliably on my truck.

I know I need to keep compression low so I'm considering using my D8VE heads and having them ported. What size valves should I be putting in them? Also, will the 92cc chambers keep my compression low enough to run the blower or should I add dished pistons to reduce it a bit more?

Also wondering what cam profile would be best to use in this engine. As much as I try I can't make any sense of cams!

Any other suggestions are welcome. I plan to get work started on the heads next month and then on the block as I can afford it (stop laughing! ).

Ivan

 

A 545 with an 8-71 blower and D8 heads? I don't know if you'll get the flow you'll need from them to support the power potential of your suggested combo. 2.19"intake and 1.75" exhaust valves at a minimum, and fully ported. You may have as much, or more, into these iron heads as you would a good set of aluminum heads that flow as good or better out of the box than all but the very best (and spendy) port jobs on iron heads. That is, of course, unless you plan on porting them yourself. Count on a lot of hours at the bench grinding them and more hours getting them flow tested to make sure you are doing it right. The aluminum also have a potential to flow much better with only mild port work required. As far as a cam goes, call the cam (like Crane, Comp, Crower, Lunati, etc.) companies and give them you exact combo, and let them do the cam research for you. They should be able to come up with something that will work in your engine.

 

Any other suggestions are welcome. I plan to get work started on the heads next month and then on the block as I can afford it (stop laughing! ). [/B][/QUOTE]

Ivan, you crack me up...you've got ambition aplenty. I really have to agree with Ford79...you are going to have to step up in your head department for a good fit with a blown 545. I know I am always pimping heavily worked Doves but in this case you aren't going to want to use any stock casting...I don't care how much porting wizardy is put into it. Check the other thread on here about building the ultimate stroker because there is allot of talk about which heads to use, and some good links. Check them out, and then cringe. Kaase has some good stuff going on though...

 

Yes, Kaase has some awesome heads. I'll take 2 sets of those Hemi's, just so I have a spare. What's that you say? They only work with an SVO block? Well then throw one of those on there too . . . make it aluminum please.

Crap, thought the cast heads would work if I had them ported right but I guess it's on to aluminum. Are there any aluminum heads which are available with a 92cc chamber other than the Performers? All the aluminum heads I've looked at were in the 70cc range which would give too much compression for a blower application. The Performers seemed to need a bit of porting to actually 'perform' which is why I was looking at using the cast heads and saving the extra $1700. But what the hey, it's only money. Kaase Cobra Jets were looking good but again, only 72cc chambers.

Maybe I'll start with machining the block and put heads on the wish list.

 

I don't think you'd save that $1700 if you were to put that much work into those iron heads. I have something like $1100 into my ported D0VE's, but I didn't do the porting either, I had the shop that did all the other machine work do it. Do the Victor heads only come in small chambers? What about the RPM's?

Here's the flow sheet from my D0VE's

 

Mike, I've only ever seen the Victors in a 75cc head. The RPM's are what I'm looking at going with (I was calling them Performers). They come with a 95cc chamber which should work perfect once they're ported. I would imagine aluminum is less expensive to port than cast?

What kind of flow should I be looking for when all is said and done? You got some pretty impressive increases from the porting done in the D0VE's. I can't find anything that lists stock flow on the RPM's. I know I'd have to have them opened up but I'm curious what they are stock.

Thanks for the help guys.
Ivan

 

I found the flow numbers on Edelbrock's web site, flow #'s are the same for the 75cc and 95cc versions, #60679 and 60669 rescectively:

• .100"--76I / 67E
• .200"--140I / 118E
• .300"--207I / 153E
• .400"--260I / 180E
• .500"--300I / 200E
• .600"--319I / 207E
• .700"--326I / 207E

 

Yea, alum is much easier and cheaper to port...and while you can get great flow from a Dove (heck, its what I use) I still think for your app you want to go in a different direction. I know a fellow that flowed some eboks out of the box and he found the flow to be @ 20cfms lower than those advertised on eboks site. The thing with the alums, is that while a sweetly ported Dove will outflow them out of the box, once the alums have been given some loving care they are untouchable by the stock iron.

 

I may be wrong, but what about Blue Thunders? They have a decent sized chamber, but you have to have headers fabbed up.

 

Maybe some dished pistons would help you bring the compression ratio down.

I may be wrong...but I think later blocks had taller deck heights than early blocks too.

 

I don't think the dished pistons would bring the compression down enough if I had 70-75cc heads. I'm thinking of using some dished JE pistons with the 95cc heads, to be on the safe side.

I think I'll go with the RPM's and have them ported. The flow on those is very impressive out of the box, even if they are overated 20cfm.

 

It’s your lucky day.



I have the perfect flat tappet cam for you. It was my first cam in my blown 547 and I haven’t been able to beat the power it made yet, even with two custom rollers from Cam motion.I have the dyno sheets to prove the cams performance compared to others. Its funny, Bds warned me that no cam could make the power that theirs do because of their extensive cam testing. But we had to try… should have listened.

Now after spending the money for new crower roller lifters, two cams and pushrods I’ve just left the new cam in. Let me know if you’re interested, cam and lifters were only used for 3 short months driving on the street and they’re in mint condition.


I also used the 95 cc edelbrock rpm heads on my blown deal and they supported some good power even with a poor designed 2-inch primary header that I used. You will probably want to open your Edelbrocks up to 98 or 100cc and use a dish piston somewhere around -25cc with 0.040 gasket to keep cr down.

I also have a mallory distributor for sale that BDS curved for the blower and it has the crab style cap for low profile. I think you will need to do something like this if you already havent.


ps have you bought your blower yet? What size are you thinking about using?


Blown 547 Edelbrock heads

 

Depending on what induction your gonna use, You can get away with the "stocker" heads you want to use.............I've slapped the 671 on a stock 460, and drove it on the street and loved it............super reliable...........talk about waking up a 460.........

 

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