Norwood

[GregWeld]

If I was trying to build a show car - the headers would be going back - while I might ponder it a while if it was just a street car -- HOWEVER --- no way I'd pay full price! So I'd give the supplier the choice... return or a big discount to keep 'em.


I'd fully TIG the baffle "just because" -- think of it as practice -- and welding is soothing...

[Sieg]

Originally Posted by GregWeld

I'd fully TIG the baffle "just because" -- think of it as practice -- and welding is soothing...

Compromise..........no one will argue the fact that I need practice! Especially with the TIG. It can be soothing but in my latest example it can also be pretty embarassing. Since time isn't on my side right now I pulled it and added more "security" tacks with the MIG.

[Sieg]

Finally found out what cam the motor has.........because there was two bad lifters and lobes. Motor still has good cross-hatching in the cylinder bore. I learned something I was totally unaware of - zinc additive for flat tappet cams. Obviously I wasn't in the car scene when zinc was removed from oil and this became an issue.

The cam was installed in 1989 and they still sell the pattern.

Edelbrock 5002

Summit Racing Part Number EDL-5002

UPC 085347050024

Cam Style Hydraulic flat tappet

Basic Operating RPM Range 2,500-6,500

Intake Duration at 050 inch Lift 232

Exhaust Duration at 050 inch Lift 234

Duration at 050 inch Lift 232 int./234 exh.

Advertised Intake Duration 292

Advertised Exhaust Duration 300

Advertised Duration 292 int./300 exh.

Intake Valve Lift with Factory Rocker Arm Ratio 0.488 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio 0.488 in.

Valve Lift with Factory Rocker Arm Ratio 0.488 int./0.488 exh.

Lobe Separation (degrees) 108

Hopefully the crank and rod journals pass inspection.

[makoshark]

Go roller. I realize its cost is more, but the peace of mind as well as performance gains outweigh the extra cost. Today, though, roller cam setups aren't as expensive as they once were

[WSSix]

If you don't go roller, remember you'll have to run specific oil since the modern "regular off the shelf" oil doesn't contain enough ZDDP for a flat tappet cam.

[ccracin]

The welds are definitely coming along! I give you alot of credit for sticking with it with all you are going through. Keep up the good work.

[Sieg]

Originally Posted by makoshark

Go roller. I realize its cost is more, but the peace of mind as well as performance gains outweigh the extra cost. Today, though, roller cam setups aren't as expensive as they once were

Next motor!

[Sieg]

Originally Posted by WSSix

If you don't go roller, remember you'll have to run specific oil since the modern "regular off the shelf" oil doesn't contain enough ZDDP for a flat tappet cam.

I guess being focused on high performance off-road and track bikes running high-dollar Motorex and Motul synthetic lubes the last ten years I completely missed the zinc bulletin.

I was really caught off-guard on this one.

Here's the cylinder bore that was done in 1989, don't think it has over 9K miles.

[Sieg]

Originally Posted by ccracin

The welds are definitely coming along! I give you alot of credit for sticking with it with all you are going through. Keep up the good work.

Thanks Chad I really appreciate it.

[MarkM66]

Yeah, go roller.

And ZDDP is just a lot of hype. There's more to oil protection then the amount of zddp it has.