360 with 428 pistons
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360 with 428 pistons
On a 360 the pistons are down in the hole.Using 428 pistons would they be down the hole even farther?Where can one find specs on pistons and rods? I would like to be able to see what the wrist pin to piston top differences are.
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From: Lost
Without spending a lot of time looking, I would venture to guess a 428 would have a similar piston pin location as a 410, since the crank and rods (length, at least) were shared. The 410 uses ~1.66 pin hieght/compression distance (CD), and the 360 uses ~1.76.
As such, a 410 piston would be right around .100 further "down the hole" than a 360 piston, so I would assume the same would hold true for a 428 piston. Of course, there's also the minor issue of bore diameter to deal with for the 428 piston......
The 360 used 352 rods and crank, with older ~1.76 390 pistons. I'd guess the 352 pistons had a CD of around 1.8-1.9 (again, guestimating, as I don't have a spec book in front of me). This is what would be needed to bring the pistons back up to the "top of the hole".
I haven't looked, but I'd bet there is someone offering a higher CR piston for a 360, that uses a CD that closely matches that of the 352. Most people just swap 390 crank and rods in, and use 1.76 CD 360/390 (pre 68) pistons.
As such, a 410 piston would be right around .100 further "down the hole" than a 360 piston, so I would assume the same would hold true for a 428 piston. Of course, there's also the minor issue of bore diameter to deal with for the 428 piston......
The 360 used 352 rods and crank, with older ~1.76 390 pistons. I'd guess the 352 pistons had a CD of around 1.8-1.9 (again, guestimating, as I don't have a spec book in front of me). This is what would be needed to bring the pistons back up to the "top of the hole".
I haven't looked, but I'd bet there is someone offering a higher CR piston for a 360, that uses a CD that closely matches that of the 352. Most people just swap 390 crank and rods in, and use 1.76 CD 360/390 (pre 68) pistons.
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From: Lost
In that case, the block would need sonic testing to insure there is still enough material left to go any larger. If it will, I'd start looking for the rest of the stuff to put it together as a 428. Few 360/390 blocks will go much beyond 4.110 (.060 over) before getting too thin, but some can go to the 4.130 and beyond. Sonic testing is the only way to know.
If the 428 pistons do have the CD of around ~1.66, putting them on your current rods and crank could yield way too low of a comp ratio to ever run worth a hoot, if at all.
If the 428 pistons do have the CD of around ~1.66, putting them on your current rods and crank could yield way too low of a comp ratio to ever run worth a hoot, if at all.
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428 pistons are going to give you 2.7:1 compression, which will be good as your cylinder walls will be paper thin if not poked through.
FE Series Engine Specification Chart
Compression Ratio Calculator
Someone mentioned 361 pistons as the answer earlier. Other than that, no soap for higher CR for the 360. I do not have the info on the 361 slugs so not sure that works.
On Edit:
Silvolite lists a 361 piston with a 1.902 compression height. Gotta run, can do the numbers on that right now...
http://www.kb-silvolite.com/silv-o-l...tails&S_id=146
FE Series Engine Specification Chart
Compression Ratio Calculator
Someone mentioned 361 pistons as the answer earlier. Other than that, no soap for higher CR for the 360. I do not have the info on the 361 slugs so not sure that works.
On Edit:
Silvolite lists a 361 piston with a 1.902 compression height. Gotta run, can do the numbers on that right now...
http://www.kb-silvolite.com/silv-o-l...tails&S_id=146
Last edited by 85e150; Dec 10, 2011 at 08:45 PM. Reason: add 361 info
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[quote=If the 428 pistons do have the CD of around ~1.66, putting them on your current rods and crank could yield way too low of a comp ratio to ever run worth a hoot, if at all.[/quote]
Thats what I was afraid of!!!!
Thats what I was afraid of!!!!
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PROBLEM SOLVED!!!!!!! A guy I know has a 390 FREEBEE!!! New rings,crank turned,new rings,mains,rods,cam bearings,timing gear and chain,oil pump,lifters and gaskets!!! and nothing to put it in so its going to be scrap iron if I dont come and get it.No heads.They sprouted legs and walked off!!!! It has been sitting in his shop for several years and needs to be put together.He said get it all out of his shop and out of his way!!! Well as they say a blind hog will find an acorn once in a while!!!!
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From: Lost
Reading thru that FE spec chart, I see a *possible* use of the 428 pistons (assuming the block can go to 4.13). 390 crank/rods (406). The CD on the 428 pistons is very nearly the same as the 410/late 390, so the CR would be somewhere in the mid 8's/low 9s (I don't have access to all the required info to properly calculate).
That's grasping for straws, and pure speculation at this point though. Too many variables to consider, firstly the block integrity.
That's the only way I could see to use a 428 piston in your current block..... and can't even be positive it could work.
Perhaps it's time to start calling salvage yards to locate a buildable 360/390.....
That's grasping for straws, and pure speculation at this point though. Too many variables to consider, firstly the block integrity.
That's the only way I could see to use a 428 piston in your current block..... and can't even be positive it could work.
Perhaps it's time to start calling salvage yards to locate a buildable 360/390.....
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Post Fiend
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From: Lost
PROBLEM SOLVED!!!!!!! A guy I know has a 390 FREEBEE!!! New rings,crank turned,new rings,mains,rods,cam bearings,timing gear and chain,oil pump,lifters and gaskets!!! and nothing to put it in so its going to be scrap iron if I dont come and get it.No heads.They sprouted legs and walked off!!!! It has been sitting in his shop for several years and needs to be put together.He said get it all out of his shop and out of his way!!! Well as they say a blind hog will find an acorn once in a while!!!!
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