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- From: hotrod@dixie.com (The Hotrod List)
- Subject: Re: Mercury Marine
- Message-ID: <_mrq1sf@dixie.com>
- Date: Mon, 23 Nov 92 17:38:47 GMT
- Organization: Dixie Communications Public Access. The Mouth of the South.
- To: hotrod@dixie.com
- Reply-To: hotrod@dixie.com
- Posted-Date: Monday, Nov 23 12:38:41
- X-Sequence: 2794
- X-Gifs-To: met@sunset.cse.nau.edu
- X-Gifs-From: ftp.nau.edu
- Approved: jgd@dixie.com
- Lines: 63
-
- > Buick, that's me!) Anyway, it turns out the '87 is almost completely
- > weird-Alice. Here's a brief list:
- >
- > Short block: one piece rear main seal. Special gaskets and seals
- > required. Oil pan does not interchange with early models.
- > Crank does not interchange. Smaller flywheel bolt
- > pattern. Externally balanced (old motors were internally
- > balanced). Cam bolt pattern is different. Cam is
- > retained by a plate like a Ford (it's about time), but
- > that makes cams non-interchangeable. Deeper lifter bores
- > and bosses for roller lifter retainer plate. According
- > to Chevrolet, the engine is supposed to have roller
- > lifters; being a Mercury Marine, it has a flat tappet cam.
- > Timing chain set is different to accomodate new cam bolt
- > pattern.
-
- I've built a 350 from a 1991 GMC truck and its engine was similar.
- One piece rear main seal, different pan, different crank (I believe Chevy
- does make a kit to use an old style crank in this block, tho). Not
- sure about balancing. The cam bolt pattern was the "old" style though.
- Factory cam was flat hydraulic. No thrust plate, but block was machined
- for the factory roller cam style thrust plate. I had Crower grind a new
- cam for it, and they used the GM rollercam style small bolt pattern.
- Lifter bores were too short for GM's roller lifters.
-
- >
- > Heads: raised valve cover rail, machined gasket surface instead
- > of the crummy casting Chevy used to expect to seal, rubber
- > valve cover gaskets, Ford 292-style retainer bolts through
- > the center of the valve cover, 5/8 hex tapered seat plugs,
- > 1.94/1.60 valves, rotators on exhaust valves,
- > old-fashioned tin oil deflector cups on top of the spring
- > retainers, valve guides already machined for Perfect
- > Circle style seals, with standard crummy Chevy O-rings on
- > all 16 valves, *plus* PC seals on the intakes only,
- > center intake manifold bolts are angled more vertical,
- > probably for clearance - this however makes early and late
- > intake manifolds non-interchangeable, rocker arms are
- > wider and "straddle" the valve tip, again like a Ford,
- > intake and exhaust ports are totally different from any
- > Chevy port I've ever seen and not bad IMHO - small guide
- > bosses, big short-side radius on intake port, exhaust port
- > is almost constant in cross-section with D-shaped floor.
- > It's the "lightweight" casting though, scalloped and with
- > the big coolant holes.
- >
- Again, sounds very similar to my 91 truck engine. Center intake bolts
- are angled vertically on the 91, too. A little work is required to use
- an old style intake, but not too bad. I don't remember what the ports
- looked like. Didn't use the heads for my project... used Dart II
- sportsman instead.
-
-
- --
- Jon Lusky
- lusky@gnu.ai.mit.edu
-
- 79 Rx-7 12A/Holley 4bbl
- 67 Camaro/350/4spd (under construction)
- 89 Jeep Wrangler/258 (currently self destructing)
-
- ----------
- Posted by: emory!gnu.ai.mit.edu!lusky
-