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camshaft schneider 248-56

Moderator: Mod Squad

sdiesel
Registered User
Posts: 616
Joined: Fri Jan 06, 2012 12:33 am
Location: NW Oregon,Buxton currently

camshaft schneider 248-56

Post #1 by sdiesel » Thu Mar 14, 2019 12:51 am

paul, this cam is my current cam with a rebuilders head.

with the Jr head, will I be better advised to change cam?

the unsightly mess I will make if I don't begin to sync parts pretty soon, before i begin making real power, will lead to my demise.

the block has, best I can remember the d -dish hyper rebuilders , likely cast iron rings
.60 overbore, we did not zero deck.
a long love affair with the 300 six.
my lastest and final fling is a fresh 300 in an 88 ford f350 dually 4X flatbed

pmuller9
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Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: camshaft schneider 248-56

Post #2 by pmuller9 » Thu Mar 14, 2019 9:16 am

It looks like your compression ratio might be around 8.4 with a 76cc carb head.
The JR head would change the CR to 9.1

A Schneider 140H (13912) .496”/.496” 220/220 280/280 110deg would give you a wide power band including better off idle torque and keep you from having to use premium pump gas.

The Crower 284HDP (19205) .509”/.517” 220/222 284/290 110deg will also work very well.

sdiesel
Registered User
Posts: 616
Joined: Fri Jan 06, 2012 12:33 am
Location: NW Oregon,Buxton currently

Re: camshaft schneider 248-56

Post #3 by sdiesel » Thu Mar 14, 2019 11:20 am

Thx paul.
I failed to mention this engine is in an 8000# truck with a 5 speed.
410 gearing.
chang anything ??
a long love affair with the 300 six.
my lastest and final fling is a fresh 300 in an 88 ford f350 dually 4X flatbed

pmuller9
Registered User
Posts: 3024
Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: camshaft schneider 248-56

Post #4 by pmuller9 » Thu Mar 14, 2019 11:33 am

No
Because the ports are undersized for the cylinder displacement we see increased torque across the entire rpm range as the intake valve is closed later. (Up to a point)
A ported iron head doesn't have much more port volume than stock.
Last engine had a 232* .050" intake duration and made serious torque from 1200 rpm with a fully ported big valve head.
A 220* intake duration should give you plenty of torque from just above an idle and will supply a lot of power to keep the truck rolling at highway speeds.

sdiesel
Registered User
Posts: 616
Joined: Fri Jan 06, 2012 12:33 am
Location: NW Oregon,Buxton currently

Re: camshaft schneider 248-56

Post #5 by sdiesel » Thu Mar 14, 2019 12:05 pm

Thx Paul
I'm going down to their shop here in a few minutes.
dave
a long love affair with the 300 six.
my lastest and final fling is a fresh 300 in an 88 ford f350 dually 4X flatbed

sdiesel
Registered User
Posts: 616
Joined: Fri Jan 06, 2012 12:33 am
Location: NW Oregon,Buxton currently

Re: camshaft schneider 248-56

Post #6 by sdiesel » Thu Mar 14, 2019 7:41 pm

just to say, Paul thx Fer the input.
jerry was out and I got a word with Kevinno at schneider.
Kevin is usually the shop guy doing the work.

I explained, ,he concurred. and the opinion of his fell right directly in line with the opinion u have expressed herein.
essentially he said "you were right on with ur assessment".

I invited, nearly plead for them to join up to see what was going on here.
perhaps they will and we get another top flite resource at our disposal
a long love affair with the 300 six.
my lastest and final fling is a fresh 300 in an 88 ford f350 dually 4X flatbed

BigBlue94
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Posts: 292
Joined: Wed Mar 07, 2018 6:38 pm
Location: Hoyt, Kansas

Re: camshaft schneider 248-56

Post #7 by BigBlue94 » Sun Mar 17, 2019 11:32 am

I have the Schneider 140H in my 300 with 9.75 CR and a factory head with big valves. It's a week or so away from firing up.

I was impressed with their service and visual quality of the cam.
1985 Bronco. 300-6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. 300 has a 4bbl and headers.

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