WizardBlack

OK guys, here's the scoop. I need some good advice for my build.
Subject: fox mustang (of course)
Idea: bought a 1969~1970 351W longblock for $330; never been bored, etc.
Plans: eventually I plan to put the powertrain into a kit daytona coupe (the big brother to the kit cobra)

I wanted to build it for at least 7k rpm's. Not, 'yeah you can touch 7,000 rpm once in a while' but a nice solid car that I can spin to 7k when I feel like it. I don't "love the limiter" in my cars or anything but I don't want to feel like accelerated wear is occuring when I spin to 7krpm. The car will be built for a street weekend car with the "street" part used very loosely. I don't drag race much; more of a road race type guy. I hope to eventually build a twin turbo setup for it. I can handle that portion but the motor build itself is grey area for me.

The build setup:

Trick Flow R series EFI manifold (powerband 2000~7000)
Comp Cams XR286R solid roller cam (lift at .050 248/254, lift .614/.621, powerband 3000~7000, duration 286/292)
Comp Cams solid rollers
Comp Cams higher end pushrods 5/16"
Comp Cams 7/16" Roller Rockers
AFR 205 Heads

That pretty much covers all of it except the shortblock.
So here's the deal;
What is necessary on the bottom end? I'd like to consider ~700 horsepower the limit (from adding turbos later). It seems like Eagle H beam rods will do the trick and aren't too expensive. For pistons, I was thinking 9.5:1 or so with Ross which are also not too expensive. I have no idea what the stock crank will handle. I am sure a main brace will be necessary.
What do you guys think? What is it going to behave like, sound like, what kind of power? Are the heads overkill? Not enough cam? Too much bottom end? etc. etc.

Can I build a pretty cheap bottom end to hold over 700 hp and rev past 7k?

I really appreciate your guys' input.

Mark

gotboost

how much boost are you goin to run? I think your compresion may be a little to high. The highest with turbo i think you should go is 9.0:1

69mach1377

Steel crank and good rods will be required. Stock crank may be good for 500hp, not sure about 7k rpm though.

WizardBlack

Compression will vary with what pistons I put into it. I was going to aim for 9.0:1.
You can run plenty of boost as long as it's set up and tuned right. I've tuned pump gas cars with 9.0:1 up to 23 psi on 93 octane but a lot depends on tuning and the efficiency of the engine.
Turbos will be quite a ways down the road, though. I wasn't as concerned about that right now. I was hoping to hit 450/450 without boost.
The biggest thing concerning me now is the rpm limits.

WizardBlack

Hmm, no one has any comments on the motor performance before the (LONG term) plans for boost?


Mark

bfirkin

why are you going to build a solid roller cam motor for the street if u arent drag racing. if you want a motor that will last you a long time and plenty of power build a 408 out of that block. u can get 675hp out of that block all motor easy and whats the obsession with spinning 7k the higher u spin the more wear no matter what u have.