Rebuilding my 464

[sixty9cobra]

I posted this in the dyno section by mistake.


Hi guys something let go in my current 464. The motor is 8 yrs old many street miles lets say 10k, has 50 track passes plus the usual flogging it on the street. It has Eagle crank, Scat rods, CP pistons 10.5:1 .040 over, Erson rockers, Hooker 1 3/4 headers, 3 inch exhaust, Fidenza 13lb aluminum flywheel. Cam is similar to a comp 294 (custom grind by builder), street master port matched, Holly 850, Msd dist locked timing. Barrys Edelbrock heads pro ported  flows 330 @.600. This combo made 415 rwhp at 5800.
                            What would I need to do to get to 550-600 hp on pump gas? I am assuming it spun a bearing at this point crank is probably toast. Block is good so are the heads. Lets hear opinions.

[Stangman]

Sorry to hear about the motor, surprised that the set up you have now is only 415 horse sounds alot like 475-500. Just from watching all the dyno pages and listening to the gonkulator,  with ported heads that camshaft 10.5 to 1 comp,stroker crank.
The engine builders Im sure will chime in, good luck. I dont know about the eagle crank but the 428 cranks can be cut to like 30 and 40 thousanths.

[KMcCullah]

Have you torn it down yet? If not....better make sure the block is still healthy. May have spun a main bearing etc. Keeping the block, I'd bump the compression a point and add a solid roller cam. Maybe consider a 4.375 crank with a set of custom CP pistons if your Eagle crank is spun out. That should be fairly easy. If the block is not useable, that's a whole nother' deal. 500 inches here we come. 

[blykins]

You should be there already. 

I built a 445 with as-cast heads from Barry, 10:1 compression, Performer RPM intake, and a 235/241 @ .050" hydraulic roller camshaft.  It made 525 hp here and 440 rwhp on the chassis dyno at the customer's location in California.  That's a "normal" 15% loss.

Your parts should have already put you at the 550 hp mark at the flywheel. 

[jayb]

Harry, just to clarify, you are looking for 550-600 rear wheel HP, or 550-600 flywheel HP?  Brent is about right with a 15% loss through the drivetrain, so if you were 415 HP at the rear wheels you are probably around 490 HP at the flywheel.

At over 500 HP the Streetmaster tends to fall off a little, so I think one place for improvement would be the intake.  I'd be looking at a Performer RPM or a Victor.  But I think your biggest area for improvement is the cam, if I read into your post correctly that it is a flat tappet cam.  If that is the case I think the cam is holding back your existing combination, so I'd be looking at a strong hydraulic roller, or mechanical roller, to get you up to 600+ flywheel horsepower.  The heads are going to easily support that power level, in my opinion.

One other thing.  Eagle cranks scare me.  I was talking to the local crankshaft outfit's owner the other day, and was asking him what he thought about the aftermarket cranks that are available.  He strongly urges his customers to steer clear of Eagle cranks and rods.  He told me a story about grinding Eagle cranks.  When you grind a crankshaft you get sparks coming off the grinding wheel.  He says that on Eagle cranks, much of the time the color of the sparks changes as the grinding wheel moves across the journal.  He said that indicates variations in the composition of the crank material, which of course isn't good.  If you tear your engine down and the crank needs work, my advice is to buy a new Scat crank instead of trying to re-use the Eagle crank.  You might even think about going up to the 4.375" stroke.  More cubes equals more power.

By the way, great to finally meet you in person at the FE Reunion, and good luck with the rebuild - Jay

[blykins]

X2 on the Eagle cranks.

You will never see one in my shop. 

[sixty9cobra]

.

[blykins]

I'd be looking for a Performer RPM, gasket matched, with a Super Sucker on top. 

[sixty9cobra]

Holly Cow the Edelbrock Victor is $700 and change. That's more than a new crank. And to clarify I was talking crank hp. I'm around 490-500 ish I would like to be closer to 600 maybe I am dreaming.

[blykins]

You have enough cubes and cylinder head.  With the right cam and intake, you'll be there, but keep in mind that it will probably have to be a healthy-sized solid flat tappet or solid roller.  You'll have to pull it higher, which will change your horsepower and torque curves. 

[sixty9cobra]

Sounds reasonable to me. I understand the bigger cam this one was finished by 5700. By the dyno sheet I posted yrs ago Jay said the cam was to small. I left it up to the builder and he was to conservative in cam selection. If I go with a healthier cam do I need to up my compression?

[blykins]

No, you don't have to.  10.5:1 is plenty and the next camshaft should be designed to work with that.  You still running a TKO in there?  What's the rear gear?

[sixty9cobra]

TKO-600 still in there. Im running 411 Tru-Trac, 28" tire (275-60-15)

[blykins]

Then the rest of the car is set up for it. 

[cjshaker]

Harry, I'm curious what your trap rpm is? With 4:30 gears, I'm only turning 6000 at the line. With your overdrive, it seems like you could get away with more gear.