6.0-928S

Thanks. It's an 87 block. Why do you think it's an 85/86?
Hammer
BTW, you never elaborated on your comment about the "main bearing feed hole" from my earlier pics.

Steve Cattaneo

It looks like the pistons do not the have the proper coating to work in an allisil bore, or are they steel inserts. Based on the marks on the pistons and cylinder walls your piston clearance may be too tight.

6.0-928S

Hi Steve,
How have you been? Hope all is well with you.(We spoke not too long ago abouth the hi-stall converter)
The marks on the cylinders were there after I washed the block down with Tide. They are water marks. They disappeared when I rubbed them down with oil. The pistons are factory Porsche Mahles, they are coated. The marks are much more noticable in the pictures than they are in person. It's probably just dirt/oil combo from the many times they have been in & out of the cylinders during fitting & clearance checking. The clearance is fine. I just kept fitting them to get the best piston in the best hole clearance wise.
Thanks, Hammer

Steve Cattaneo

All is well. With that engine you may need a higher stall speed converter. If the new engine's torque curve is at a higher rpm range then stock. Are you using that intake on that engine? It looks like my Hilborn setup I have on my 502 engine for my chevelle. Go luck with your project.

6.0-928S

That's the engine in my Hemi Belvedere. All aluminum Keith Black Race Hemi. I converted the old mechanical injection to EFI. If you look close, the rings at the bottom of the stacks are individual filter screens I fabbed up so I can drive it on the street. Roller, 12.5 to 1 Venolias, ported Barton heads, Jericho DR4. Maybe we can meet sometime & compare notes!
Thanks, Hammer

928SS

not trying to start trouble, but I was told by JE not to use perfect seal rings w/NA motors cause they sealed too well, caused oil build up w/the scraper ring which caused ring flutter for the whole stack....
alledgedly GM did a major study trying to get better emissions w/them and thats what they "discovered".. still lots of drag racers seem to use them NA anyway... just a point of curiosity...

IIRC, w/the 968 pistons, 5.85" rod and the 3.75" "stroker" cranks, you'll get about 11.6:1 or so w/968 valves/S4/GT heads, .043" or so head gasket... will also pop out of the hole a bit (.015" or so)did you cc your heads and stuff yet?? or are you using the 5.7" rods?? again, just curious/comparing notes... not trying to start a debate (for once)...

to avoid all that, I just nicomed my block, and used custom pistons to get things level and compression under control (11.3:1)... I'm sure there are many ways to skin the cat, hence my curiosity...

also had a heck of a time rewiring/fitting later MY stuff for the later intake on my 85 chassis... had to use 88 harnesses, late model fans/oil control/h20 pump/tensioner stuff/fuel system stuff to integrate/fit, and then put in a GT ECU system to work the GT intake flappy thing too... was a bugger at 1st, but it seems like it's gonna work out ok now... lots of changes btween MY's on these things that come out of the dark when you try to retrofit/upgrade...

if you try to convert vs just go aftermarket w/everything, let me know as I've discovered a few things that might help/give you a heads up on...

love that hemi....

ps - FWIW, I raised the stall on my old gal to about 2150 or so, made a huge diff w/the stock motor, but w/the stroker it's got so much grunt I really couldn't tell....just spins and smokes tires... I suppose throttle control or self control would help, but thats a lost cause w/me...

6.0-928S

Hi Rob,
No offense taken dude. "If you correct a fool he'll hate you for it. If you correct a wise man he'll love you for it". (ref: thick book called the Bible)
Actually I said Total Seal rings, I've never used Perfect Seal, but I assume they're similar. All I know is that I have used them before & have been impressed after engine tear downs. The difference in power, longevity, & lack of blowby, results in a lack of oil varnish, etc. GM can do all the studies they want. They have infinitely more resources than I do. They also have a lot more geek engineers that wouldn't know when to deviate from 'the book' & learn from real world experience. To each his own. Simply put, my experience with them leads me to prefer them.
I'm not using 968 pistons.
I wanted to stay with the original Alusil cylinders because of their reliability & longevity since this is a street car. The original engine still in the car has 175,000 miles on it, runs strong, doesn't smoke or use oil. I want the same from this engine.
I got started with this stroker because I worked in a shop that built Porsche Race Cars. They were all 911s & 951s, etc. They laughed & said 928s couldn't be fast race cars. Now what do you think my reaction was!
Thanks for your consulting offer. If necessary I'll take you up on it. I expect to overcome modification obstacles as I have over the years. We'll see.
I'm also contemplating installing a variable cam timing device, ala Sterling. But I don't plan on using Porsche's method. What I have is much simpler to implement. Research is currently ongoing. I much admire Sterling's accomplishment, he's a trailblazer, but I think there's another way. Again, we'll see.
Thanks for the Hemi comment.
Hammer

m21sniper

What speed were you looking at in a modified hi-stall converter 6.0?

Just curious.

928SS

duh, 6.0... guess I should try reading someday... guess nobody saw mark a's or joe f's, etc cars... looks like you'll represent the fat and lazy 928 quite well also!!! yeehaa!!

6.0-928S

Hi Snipster,
Still waitin' for that Pat's steak meetin'.
I'm not looking for any specific speed goal. Just hi-speed. Power, torque, better, faster.
What speed do you mean, trap speed, top speed, idle speed?
PM me, we can talk on the phone if you'd like.
Hammer

6.0-928S

Thanks man,
I plan on my 928 openin' up a BIG can on the 911/951 guys! (H/P wise) I've done many PCA seminars & I haven't heard many smart remarks from those guys since I started the build & it's not even done yet!
Cover me, I'm goin' in!!!
Come & git some!!
Hammer

m21sniper

I was referring to the stall speed of the converter you were looking at.

PM sent.

6.0-928S

Hi all,
More progress today. Got all the pistons & rods in. I miked each piston & bore & fited them all to get the optimum fit in each cylinder. Also miked the width of each rod & paired them as equally as possible to have consistent side clearance per throw.
Checked the crank end play.
Found top dead center & started to check each hole's deck clearance & ran out of time. (Also felt I deserved a beer! What a coincidence!)
It's comin' along.

(Note the high dollar pointer, I bought it from NASA!)

JEC_31

This is going to be one sweet stroker!

6.0-928S

Thanks, man.
Today I got the aluminum to fabricate the flanges for my intake manifold. I should have the tubing early this week. It will use the factory sensors & throttle body but be hot rod based with a fresh air shaker scoop. I'll post those pics soon.
Hammer