re-powering the 64 Gal.

[oldgal]

G'day all, long time no post.

I've been busy over the last few months rebuilding a 428 for my Gal project. The motor came out of a 69 mustang and was a runner when I got it, showing 145 to 160 compression.  Once I got it home though i had a peek down the plug holes and discovered rust in most of the bores.  The motor had been sitting stationary for a long time with moisture in it.  That was the excuse I needed to freshen it up .

I sent the block to my machinist and .030 bore, .010 deck and a hone align of the main tunnels later she was ready to put back together.  I was going to use the Edelbrock performer heads and intake, mainly for the weight saving, but when I went to order the heads they had performer RPM heads on special so I got them instead.  Speed pro pistons with (I think) a 10cc dish. Stock rods and crank and the cam is a Comp 262H flat tappet hydraulic unit.

I may have to change the cam to something with a little more duration to drop the dynamic compression ratio.  Static compression calculates to about 10.2 to 1 and may be a little too high, I'll just have to see how she runs.  Anyway enough of my ranting, here's some pix.

[oldgal]

And some more pix....

[My427stang]

I would bet that the pistons are deeper in the hole than you expect and the heads have bigger chambers than advertised.

That being said, I think you are still correct, that's a pretty short cam for the combo.  You could rock it back 4 degrees and still have all the torque you need or go with a 270H or bigger if it will meet the desired end use.

Another option would be hyd roller, they typically have a little more seat to seat duration