Review my setup....please

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Anonymous

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Just getting my little hands on the last few bits needed to get this engine together. Here is what I have going on.....

250 crossflow
new acl pisrons .20 over with arp rod bolts

Cam Crow 147701 (IN.29/71 EX.78/32 280 290 214 224 .510".510" 2000
5000k)

full balance on bottom end

block zero decked shooting for CR 9.4.1

Duraspark 2 ignition

new "high energy" 289 lifters, crow springs, headers, stock 2V intake, Carb ?TBD?

This will be mated up to a C4 in a 68 Mustang. Please share your ideas on this setup, suggestions and HP and quarter time guesses would also be cool!
 
ive used a cam very similar to that one in a 250 before... it was never dynoed, id would be thinking around 190-200 hp....
As other than the cam, and the raise in compression, the isnt much done..

What are u doing to the head?
 
I will do a little at home porting on the exhaust side and just clean up a bit of casting flash on the intakes. I was told not to mess around with porting the crossflow head too much as it can actually hurt. A 3 angle valve job will also be done.

What else would you suggest doing to the head?
 
Replace the stock valve retainers, as even with cams that size and after market springs they are very prone to cracking up... A good set of Crow/Crain retainers will do nicely...

What you are doing to the head is a good idea, Is it a C2 C2A casting, with the sharp kidny shape chamber.... We take the sharp edge of this and lay it right back and around the valve to open up the valve shouding caused by the head...

You may run into problems with the push rods hitting the back of the rockers on full lift... You may not also.. At 510 lift it would be close. Cams at 520 lift do it, but my old speco cam which had 500 lift and 215@0.050 didnt do it..

Be carefull with dissy gear wear, if possible i would use a CROW (DG2) dissy gear to ovoid damage to cam gear...

manifolds can be changed later on... id put it all together and see how u go.. so far youre pretty spot on
 
Yeah I am going with the reccomended crow springs and retainers for that cam. I already have a crow dizzy gear.

What do you mean by the pushrods hitting the back of the rockers? I will be using the stock rockers...Do you mean the rocker arms hitting the valve cover?
 
The push rod as its pushing the rocker up to open the valve, fowls on the back of the rocker. Most of the time it doesnt happen, if it does you can run Early cross flow CAST IRON head tappered push rods..

Id simply chuck it all together and drive it for a few weeks, pull the rocker cover of and see if they are hitting.. If they are you will see a shinny groove around the push rod about 5-8 mm down from the pushrod tip. I have seen them wear through the push rod and break the end of, but this was with a 522 lift cam..
 
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