case 870 gas head vs diesel head

jth88 · Nov 14, 2014

Which head would have better air flow the 870 gas or the diesel head machined to accept spark plugs.
I have never had either one in my hands to physically see that's why I'm asking before I try tracking down a pair of gas heads for a pulling project. Thanks

PaulD · Nov 14, 2014

I have never had an 870 gas head in my hands. I do know that the diesel heads are cross flow heads and don't have any valve chambers on them. Around my area they don't let converted heads run, if they are legal in you area it might be worth a try. If you plan to do it look for a large injector 504 head it may make it easier for machining the spark plugs, and they probably have the biggest valves. Hope this helps Paul.

RGMartin · Nov 15, 2014

What block are you using? I only ever played with one 870 gas(stripped the engine for parts), and as I recall the head bolt placement was different and they had 1 less bolt. Also I think the diesel valves are too big to fit in the gas sleeves.

Cas · Nov 15, 2014

Isn't the 504 a 6 cylinder engine?

RGMartin · Nov 15, 2014

(quoted from post at 11:14:37 11/15/14) Isn't the 504 a 6 cylinder engine?

yes, but a 336 is a 4 cylinder version of the same thing. 2 heads versus 3.

jth88 · Nov 15, 2014

I'm looking at using a 870 block but haven't
found a gas yet. I did find a diesel local. And
I was told heads will bolt to either block gas
or diesel. I would be interested in buying a
complete gas motor if any body has one or knows
where one is.

case 870 gas head vs diesel head

jth88

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RGMartin

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Cas

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RGMartin

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jth88

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