KC850-250s cam shaft grind from Delta (1 Viewer)

[Yspen]

No answer to my question on the 60 series side - anybody here that can help ?
( heading should read KC859-250s )

This is for my 2F rebuild currently being done

I could not find a suitable secondhand camshaft to act as a donor , so I bought a Melling MC803 camshaft to send to Delta .
( my original lifters I kept and had been refaced locally )

I communicated with Delta camshafts and told them my requirements for the engine I am rebuilding . To my surprise they advised the KC859-250s grind and not the KC859 ( 262*duration) grind .

I just want some feedback from anyone else out there who runs this cam . ( very little info from a search as all seem to run the 262 )

Specs on the two grinds for those who do not know :
Perf 262 grind
Duration intake 262
Duration exhaust 267
Duration @ 0.050 is 217
Intakes opens 24, closes 59
Exhaust opens 62closes 34
58* overlap
cam rise .284 L/C 108 degrees ( gives 0.430" valve lift )
Lash intake .014 exhaust .014

Perf 250 S grind
Duration intake 250
Duration exhaust 254
Duration @ 0.050" is 215
Intakes opens 17, closes 58
Exhaust opens 60 closes 14
31* overlap
cam rise .255 L/C 108 degrees ( eq valve lift of 0.383)
Lash intake .014 exhaust .014

In another thread Mark W wrote : Quote:
A camshaft with a duration at .050 of about 210 to 217 and a lift in the area of .240-245 will produce a notable improvement in mid range and high rpm power. At the sacrifice of a small amount of peak bottom end power (below 1000 rpm).
So both fall in that category

Other comment ?

 

[RockDoc]

Is it just me, or does it look like "S grind" stands for "stock grind"?

2F cam specs:
Duration intake 250
Duration exhaust 250
Intakes opens 17, closes 53
Exhaust opens 55 closes 15
32* overlap
valve lift of 0.377 I believe

What are the numbers the Melling cam starts with?

 

[Pin_Head]

I would take their advice. My experience is that cams with a lot of overlap may sound cool at idle and provide more HP at 6,000 RPM, those features won't be particularly useful in a cruiser. Long duration, high overlap cams aren't fun to drive at low engine speeds.

 

[Splangy]

I need mine done, too. How much do they charge?

 

[Yspen]

2F Stock and 250S grind specs mentioned above

Melling 803 camshaft : ( as per their technical dept )
MC803 duration @.050 int. 189, exh. 189
Valve lift .379int. .379exh.
Lobe centers 112deg. int. 112deg exh.

So the main difference between Melling MC803 and Stock is th difference of Lobe centers .
The main difference between 2F stock and 250S grind is the Duration @ 0.050 : 189 vs 215
( what does not make sense to me is : If duration is longer , the overlap should be more but with the 250s grind it stays the same . Can someone explain how this is possible )
My big issue with the 262 Delta grind is the huge overlap - I would prefer an overlap of no more than 40-ish degrees . With the 262 it is almost double the stock IIRC 58*
My issue with the 250s grind is the limited amount of valve lift ( vs the 262 ) - very close to stock ( as Rockdoc pointed out )

The rest of the 262 specs is great - duration @ 0.050 = 217 .
The 262 and 250s grind both close the inlet at about the same time - so both have the same effect on compression .

 

[Yspen]

Are there nobody out there running this cam ?

 

[Yspen]

edit - post removed

 

[Yspen]

I need mine done, too. How much do they charge?

[FONT=Arial, Helvetica, sans-serif]grind is $75.00 and lifters are $3.50 ea.

freight is arou[/FONT]nd [FONT=Arial, Helvetica, sans-serif]$20.00 [/FONT]

[FONT=Arial, Helvetica, sans-serif]grind is $75.00 and lifters are $3.50 ea.

freight is around $20.00 [/FONT]