magnum 360 300hp crate specs

[mderoy340]

Thought I'd share some specs. on Magnum 360 motor.
93 block OEM crate motor 360/300hp The block is not drilled for head oiling.
Cam 195@050 .433 lift Motor pulls to 4800 and is done.
Upgrading cam and took the heads off today to measure everything.

Heads
True OEM rocker ratio is 1.66
Valve springs and retainers are MP crate motor single with damper.
Retainer hits valve guide seal at .545 -.050 req clearance = .495 max lift as is. I'll cut the guides down as required.
Exhaust valve stem .311 Intake stem .312 outer guide dia .530
Spring installed height is 1.6 so it looks like I'll have to cut the spring seats .050 or get some +.050 retainers.
I'll take the springs to the machine shop tomorrow and see what open and close pressure is.

Compression 8.973
Pistons .053 in the hole. I used 11.23cc for the dish (published spec)
OEM head gasket was .040 compressed 4.02 bore
heads cc'd at 62

Motor only has 10K miles so I plan on a quick bowl clean up, port match intake, and minimum push rod pinch work.

Hope this helps some folks, there's a lot of different info on the web.

 

[65Val]

Cam 195@050 .433 lift Motor pulls to 4800 and is done.

Wow...talk about mild!!!....and I don't doubt its done at 4800 either......

 

[YY1]

Is that a dual pattern cam?

.433 with 1.6 rockers?

Interesting info.

I wonder how much is identical to a factory 5.9.

IIRC advertized compression was 8.5:1

 

[mderoy340]

Is that a dual pattern cam?

.433 with 1.6 rockers?

Interesting info.

I wonder how much is identical to a factory 5.9.

IIRC advertized compression was 8.5:1

195/195 @50
measured lobe lift .261/.261
measured .433/.433 lift at valve
when you do the math my real world rocker ratio is 1.66

The only difference I see from a factory 5.9 is the long snout roller cam and double roller timing chain.

I stopped by the machine shop today and the spring specs are:
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[email protected]

 

[Prine]

and an LA Head is slightly worse Retainer/Seal clearance wise...I have seen first hand the evidence...and read it clearly a couple of times., but cant remember where.

Does anyone have "STOCK" clearance measurements on a LA Head to Clarify my point?

:?: