This is topic 69 Mustang Engine Questions & More! in forum Tech Talk at Northern California Ford Owners  .


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Posted by MustangNate (Member # 4559) on :
 
Okay, so I have a few questions about this 69 Mustang I have and it's 302. Stock they came with 220hp & 295tq, about the same as your stock fox 5.0.


Seeing as how this Mustang has something wrong with the #1 cylinder (spun bearing maybe?) she will be having a rebuild. Nothing extravegant. Cast pistons (std bore if possible), stock shotpeened rods, stock turned/polished crank. Then ofcourse I will throw on a few go fast goodies, Edelbrock Performer cam, Edelbrock Performer intake, Edelbrock Performer 600cfm carb, Tri-Y headers, Pypes exhaust, Pertronix distributor upgrade, MSD Blaster 2 coil, and MSD 6A ignition box.


One of the biggest downfalls (so I've heard) of a factory 302/5.0 are the heads. I found a set of GT-40P heads for a decent price locally and my question is, are these newer GT-40P heads any better than a stock 69 302 head or will I be losing power? Are the combustion chambers smaller, larger, or the same (compression will change obviously)? If I went with GT-40P heads, would I still be able to use my Tri-Y headers? Would I be better off looking for a 351w head?


I myself estimate the power output should be somewhere in the line of 245hp or 250hp, any thoughts?


Also, what Ford's had 8" rear ends and rear disc brakes, in case I decide to do a junk yard rear disc conversion?


Thanks for any and all comments!
 
Posted by BlueOvalRacing (Member # 1531) on :
 
Don't skimp on the pistons - it's not that much more expensive for a decent quality set.

The GT40P heads have a different spark plug angle that might interfere with early model headers. You might need to clearance a couple of tubes to keep the plug wires from hitting them. They are an upgrade from stock heads, but a ported set of D0OE heads from a 69-70 351W would also work well with some exhaust porting, + any header will fit.

HP depends on the entire combo. Too many variables.

No 8" rear ends came with disc brakes. Here's a link to some good 9" info: http://www.ultrastang.com/Rearinfo.asp?Page_ID=1
 
Posted by MustangNate (Member # 4559) on :
 
Well, I guess I didn't mean I was going to go out and buy new cast pistons. I am going to have the originals cleaned and re-use them. The car only has 90,000 miles on it.
 
Posted by 166 Merlot (Member # 1549) on :
 
you can't run that msd blaster coil with the petronics dizzy upgrade you'll burn it up, get the petronix coil. as for the edelbrock package, get it, except go with the performer RMP shit. [Whoo Whooooo!]
 




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