come are real good because of the machined step in the register, but that makes them dearer to install.

Milodon caps are also quite good, and more of a traditional style of cap so installation is cheaper.

The main question to ask, how the grade of steel differs from the iron composition of the block, expansion rates and the ability to keep the hole round are the keys to keeping the mains happy.

Id be happy with either brand of cap in my engine for an animal build.

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Edited by user Tuesday, 23 June 2009 12:16:36 AM(UTC)  | Reason: Not specified

wouldnt have thought so, a holes a hole, doesnt really matter which angle its drilled on.

The come cap requires every main web to be machined to a pretty tight tolerance, then drilled so its far more labor intensive.

Splayed caps can be installed by a competent person with a hand drill if need be, pilot bushings are available to those who choose to go this way though its not really recomended.

What exactly are you doing with this engine? hp,rpm, heads

What block are you using? easrly blocks usually need a bit of welding when fitting 4 bolt caps...

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be careful with the vt block, ive heard a lot of complaints about lifter bores not being "true".

Are you planning on a hyd. roller since its setup for it, or back to flat tappet?

The bushes will need machining down if you go to a solid roller (too short in the body), flat tappet probably doesnt matter, and id be unsure of a hyd roller that is safe to 7k.

You realistically could make your 500 ponies at around 6300/6500 if its well set up, iron vn heads start to run out of puff at 6500+ with the big crank because of airspeed approaching mach .55 and not enough material to take out so whilst it still makes power, its not really "efficient" if that makes sense.

A 3.48 crank will turn harder for the same airspeed (less cfm demand per power stroke), and since hp is a function of torque vs rpm, the higher you spin it, the more youll make.

Sounds like a good setup overall, im making around 460hp with a 355, flat tappet, near stock iron vn heads and 6300rpm so your 500hp target is easy with the bigger crank, and should be a nice engine to cruise.

Carb wise, a 750hp holley will support that, but may be a little restricted in the upper rpm so i would be looking for around 800cfm to feed it (a 950hp holley flows around 830cfm in the real world), and a harrop single plain under that.

Ignore the useless and laughable carb size formula thats been bandied about for 20 yrs, unless you want it to perform like something built 20yrs ago lol.

a standard HEI ignition will work well, if you need to spend money on an ignition system id recommend ICE in moorabin vic.

Its Australian made, Michael is a guru and local support is always handy "if" you have issues at any time.

Whos building your engine?



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