Slant Six Forum :: Bowl Work

: OK, I've installed hard seats for chevy 1.50's,
: & cut down some chevy 1.94 intakes. I am
: trying to do some pocket porting and
: blending beneath the seats.
: I've checked the past postings, and the
: articles area, but found the info on
: porting, specifically in the bowl areas
: beneath the valves, a little thin(no pun
: intended). Does anyone have a picture of a
: head cross-sectioned lengthwise through both
: intake and exhaust bowls? I am particularly
: concerned with the shared wall area below
: and between the int & exh seats. How
: thick is it? I don't want to strike 'air'. I
: did that once on a big block head, and it
: was a huge pain to fix.
: If anybody knows of any other areas that are
: perilously thin and cannot take much
: grinding please let me know.

: OK, I've installed hard seats for chevy 1.50's,
: & cut down some chevy 1.94 intakes. I am
: trying to do some pocket porting and
: blending beneath the seats. Any thin spots to watch?

: The roof and the backside of the bowl are the
: thin areas, the center dividing is pretty
: thick.
: (I can take a measurment later, I out of town
: next week so it will be a while)
: Work to get the curve out of the Slant port,
: "good "line of sight" is the
: "tip". This means some off the
: roof at the port opening and "fit
: checking" the intake to keep it as high
: on the port opening as possible. (I do this
: check up-side-down on a engine stand)
: Most of the in port grinding is done on the
: bump in the floor but you need a long shank
: cutter to get to it. The valve guide bump
: and all around the seat are also key places
: to smooth-out.
: DD

: If anybody has a junk head, too expensive to
: fix. It could serve a 'higher purpose' as a
: donated cadaver for exploratory autopsy. By
: sectioning the head and taking digital
: photos, everybody could get a feel for
: something hard to describe and impossible to
: see. Any volunteers out there?

: Bud,
:
: Doug has already posted some pics of this. Do a
: search on this site and I think it may be in
: an article here too.
:
: Lou

Author:	bud L. [ Sun Jul 28, 2002 12:15 am ]
Post subject:	Bowl Work
OK, I've installed hard seats for chevy 1.50's, & cut down some chevy 1.94 intakes. I am trying to do some pocket porting and blending beneath the seats. I've checked the past postings, and the articles area, but found the info on porting, specifically in the bowl areas beneath the valves, a little thin(no pun intended). Does anyone have a picture of a head cross-sectioned lengthwise through both intake and exhaust bowls? I am particularly concerned with the shared wall area below and between the int & exh seats. How thick is it? I don't want to strike 'air'. I did that once on a big block head, and it was a huge pain to fix. If anybody knows of any other areas that are perilously thin and cannot take much grinding please let me know. fglmopar@aol.com

Author:	68Charger [ Sun Jul 28, 2002 1:20 am ]
Post subject:	Re: Bowl Work
Quote: : OK, I've installed hard seats for chevy 1.50's, : & cut down some chevy 1.94 intakes. I am : trying to do some pocket porting and : blending beneath the seats. : I've checked the past postings, and the : articles area, but found the info on : porting, specifically in the bowl areas : beneath the valves, a little thin(no pun : intended). Does anyone have a picture of a : head cross-sectioned lengthwise through both : intake and exhaust bowls? I am particularly : concerned with the shared wall area below : and between the int & exh seats. How : thick is it? I don't want to strike 'air'. I : did that once on a big block head, and it : was a huge pain to fix. : If anybody knows of any other areas that are : perilously thin and cannot take much : grinding please let me know. I am about done putting in the 300 Ferd valves. When I did the bowl work I just opened the bowl up to the final diameter of the seat and tapered inward with a smooth blend. I dont think that hogging out the bowls would be worth the work or the risk of punching a hole. Besides a good bowl blend, the short side of the port can be taken down pretty good. Also all the slag around the guide hole with a little reshaping sure made a good looking port. Since we are on a port subject, I gasket matched the intake ports. But I am wondering about my intake manifold now. Should I leave it the way it came or gasket match it to? I heard leaving the manifolds ports a little smaller can help prevent airflow reversion. Any thoughts? Its a clifford non heated by the way. TJSzubart@Excite.com

Author:	Doctor Dodge (Doug Dutra) [ Sun Jul 28, 2002 8:39 am ]
Post subject:	Re: SL6 Head Porting Work
Quote: : OK, I've installed hard seats for chevy 1.50's, : & cut down some chevy 1.94 intakes. I am : trying to do some pocket porting and : blending beneath the seats. Any thin spots to watch? The roof and the backside of the bowl are the thin areas, the center dividing is pretty thick. (I can take a measurment later, I out of town next week so it will be a while) Work to get the curve out of the Slant port, "good "line of sight" is the "tip". This means some off the roof at the port opening and "fit checking" the intake to keep it as high on the port opening as possible. (I do this check up-side-down on a engine stand) Most of the in port grinding is done on the bump in the floor but you need a long shank cutter to get to it. The valve guide bump and all around the seat are also key places to smooth-out. DD

Author:	bud L. [ Sun Jul 28, 2002 8:49 am ]
Post subject:	Re: SL6 Head Porting Work
Quote: : The roof and the backside of the bowl are the : thin areas, the center dividing is pretty : thick. : (I can take a measurment later, I out of town : next week so it will be a while) : Work to get the curve out of the Slant port, : "good "line of sight" is the : "tip". This means some off the : roof at the port opening and "fit : checking" the intake to keep it as high : on the port opening as possible. (I do this : check up-side-down on a engine stand) : Most of the in port grinding is done on the : bump in the floor but you need a long shank : cutter to get to it. The valve guide bump : and all around the seat are also key places : to smooth-out. : DD If anybody has a junk head, too expensive to fix. It could serve a 'higher purpose' as a donated cadaver for exploratory autopsy. By sectioning the head and taking digital photos, everybody could get a feel for something hard to describe and impossible to see. Any volunteers out there? fglmopar@aol.com

Author:	Dart270 [ Sun Jul 28, 2002 10:39 pm ]
Post subject:	Re: SL6 Head Porting Work
Quote: : If anybody has a junk head, too expensive to : fix. It could serve a 'higher purpose' as a : donated cadaver for exploratory autopsy. By : sectioning the head and taking digital : photos, everybody could get a feel for : something hard to describe and impossible to : see. Any volunteers out there? Bud, Doug has already posted some pics of this. Do a search on this site and I think it may be in an article here too. Lou

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Author:	bud L. [ Mon Jul 29, 2002 8:50 am ]
Post subject:	Re: SL6 Head Porting Work
Quote: : Bud, : : Doug has already posted some pics of this. Do a : search on this site and I think it may be in : an article here too. : : Lou Yeah, I saw the one cross-section width-wise through the head(length-wise through the port). It didn't specify which port was shown. Are there other x-sections than that? I was wanting a x-section through both valve guides for one typical cylinder(long-wise through the head), showing a cutaway of the shared wall between int & exh bowls. A scale could be helpful, too. If some one wants to donate a junk stock(unported) head, I can cut it up. Don't know about the digital pics, or how to post pics, but I'am sure I could figure something out. I don't know about shipping costs, but if it's not too outrageous I could probably handle that, too. fglmopar@aol.com

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