Heads are Junk
03-21-2005, 11:26 AM
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Heads are Junk
Took my heads in to get reconditioned (valves, seals, guides, etc). Got a not so pleasant call,,,,,,,,,,, three out of four of my heads are cracked across the valve seats. 
In the market for replacements. Going to stay stock, not enough need or bread for hypo-heads. Heads are off Gen IV (1989) 454 Mags. Anyone have a good source????????????
In the market for replacements. Going to stay stock, not enough need or bread for hypo-heads. Heads are off Gen IV (1989) 454 Mags. Anyone have a good source????????????
03-21-2005, 11:31 AM
#2
Re: Heads are Junk
I have four cast iron heads that I am removing off 502 MPI mags next week. These are off of Gen 6 motors. They are the good rectangular port heads. Do some checking I think these will work on a Mk 4 motor. Let me know if they will work and we can figure out a price if you are interested.
My email is [email protected]
Dave
My email is [email protected]
Dave
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03-21-2005, 11:45 AM
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Re: Heads are Junk
Originally Posted by Bigwavz
I have four cast iron heads that I am removing off 502 MPI mags next week. These are off of Gen 6 motors. They are the good rectangular port heads. Do some checking I think these will work on a Mk 4 motor. Let me know if they will work and we can figure out a price if you are interested.
Dave
Dave
Dave
03-21-2005, 01:41 PM
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Re: Heads are Junk
I have 4 stock rectangular port heads off a 454 mag 1997 for sale, also you may be intersested in the entire upper end. I have roller cam, lifters, pushrods intake carb, etc..... 600 each set of heads, 1000 complete upper end all stock in great condition. Like to see some one be able to use.... Eric
03-21-2005, 04:58 PM
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Re: Heads are Junk
Third look for complete recon'd marine heads. May be less $ overall and bolt on saving you precious time and hassle.
The oval ports make good power on those Mags also with the right cam & intake.
I saw you say the shortblocks were in good shape cylinders "looked" good. Did you do comp & leakdown prior to the teardown? Just because the finish (and that needs to be checked) is there, doesn't mean the cylinders are round or the rings aren't glazed or undersize! at the very least you should do hone/rings and bearings...and deck the blocks if you're gonna bolt on heads it wasn't born with! you're gonna kick yourself in the azz later. Now's the time if you plan on running the boat another couple seasons min.
The oval ports make good power on those Mags also with the right cam & intake.
I saw you say the shortblocks were in good shape cylinders "looked" good. Did you do comp & leakdown prior to the teardown? Just because the finish (and that needs to be checked) is there, doesn't mean the cylinders are round or the rings aren't glazed or undersize! at the very least you should do hone/rings and bearings...and deck the blocks if you're gonna bolt on heads it wasn't born with! you're gonna kick yourself in the azz later. Now's the time if you plan on running the boat another couple seasons min.
Last edited by Rippem; 03-21-2005 at 05:17 PM.
