351w roller head identification

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Sep 20, 2008 | 03:40 PM

monkei

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From: pleasanton, sfbay

351w roller head identification

Can anybody tell me more about these oem heads: J416 (passenger) and J412 (driver). I'm assuming the third digit is a one but it could be an "I".
Anyone know what the big allen head plugs are for under the calve covers?

Sep 20, 2008 | 10:56 PM

Conanski

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I believe these are date codes, but I don't know what it translates to off the top of my head. The casting numbers are on the head gasket side near one of the center intake ports, these will identify the heads. The large allen head plugs are in openings in the water jacket that are used to remove the sand trapped in the head after it is cast.

Sep 20, 2008 | 11:32 PM

monkei

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From: pleasanton, sfbay

lower needs to be removed to see it?

Sep 21, 2008 | 11:24 AM

Conanski

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Quote:

Originally Posted by monkei

lower needs to be removed to see it?

Yes it does.

Sep 21, 2008 | 11:43 AM

doug1222556

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Quote:

Originally Posted by Conanski

. The large allen head plugs are in openings in the water jacket that are used to remove the sand trapped in the head after it is cast.

I thought I'd take those off to clean inside a set of heads..... I don't know what they do when they put them on but I was afraid I'd break something before they turned loose.... finally gave up.

Sep 21, 2008 | 03:24 PM

monkei

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From: pleasanton, sfbay

needed a mirror and light to see it but they are E7TE.

Second time i've broken the intake bolt right by the thermostat, but this time on a 351 instead of a 302.

Sep 22, 2008 | 10:53 AM

Conanski

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Quote:

Originally Posted by monkei

Second time i've broken the intake bolt right by the thermostat, but this time on a 351 instead of a 302.

I broke 2 timing cover bolts on the 302 I just refreshed, as luck would have it the remaining parts of the bolts came out fine after the cover was out of the way. It's amazing how much corrosion happens around those water passages.