Upgrading heads on a high mileage block

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05-18-2008, 05:10 PM

#11

imnotmy77stang

2nd Gear Member

Join Date: Apr 2008

Location:

Posts: 393

RE: Upgrading heads on a high mileage block

then do as i mentioned above. if your level of expertise was greater than mjr's post would be spot on.

i will say that if you wanna drop your oilpan and change the oil pump (its super easy once pan is off) it would be a very good idea. also be a REALLY good idea to use a hardened oil pump driveshaft when the new pump goes in. an ARP model is only like 20 bucks and is some of the best insurance you can buy for your motor.

05-18-2008, 05:35 PM

#12

stang8689

6th Gear Member

Join Date: Jan 2007

Location: Milford, Delaware

Posts: 5,464

RE: Upgrading heads on a high mileage block

I slapped some GT-40X heads on a 100K+ block with no problems. I had good compression and when I tore the heads off the block looked good, I cleaned thecarbon off thetop of the pistons

05-19-2008, 12:06 AM

#13

5spd GT

3rd Gear Member

Join Date: Sep 2007

Location:

Posts: 798

RE: Upgrading heads on a high mileage block

If you have not worked on a bottomend before, do not do it on something you rely on.

If it helps, I added H/C/I at 142k, and daily drove it up to 162k, when I decided to rebuild it (no reason).