Aftermarket slant six head

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805moparkid

805moparkid

Slant and AFX Guy
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i have been rolling around some plans on an aluminum head for the slant. leaning towards single over head cam but mite make first model run off stock cam.

what qualities would u want in one of these heads. thinking it should have slightly larger than stock ports but fully portable.

so!
what would u want?
2 or 3/4 valves
min/max flow numbers
OHV, single/double cams
deck thickness
shaft rockers, pedestal
valve sizes.
intake to exh location i.e same side or not

if i am going to make this i will more than likely have two versions, one is race oriented so combustion chamber will be bigger dia for bigger bores etc, and a more factory style but still lots of room for improvment...

any ideas would be great

thx ed
 
The guy you NEED to talk to if you are going to try this is Doug Dutra over on slantsix.org or through his email.


Doug has been working on a new head for slants for a long time, I don't know how close he is to casting one but you might get soe good info because he is the slant six GOD! Years ago (I think it was on the old .com site) there was a guy that got a Jag head to bolt onto a slant but the water passages wouldn't line up right.
 
360scamp said:
The guy you NEED to talk to if you are going to try this is Doug Dutra over on slantsix.org or through his email.


Doug has been working on a new head for slants for a long time, I don't know how close he is to casting one but you might get soe good info because he is the slant six GOD! Years ago (I think it was on the old .com site) there was a guy that got a Jag head to bolt onto a slant but the water passages wouldn't line up right.
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yea i think i will talk to him. but my idea is nothing based of a stocker or even needs to be cast!... hehe think on that one...
 
I wish Ihad some input to give you,sounds like an ambitious project that I'd be interested in down the road !! Crossed paths with a guy a number of years ago from NC (I believe) that was looking to go the route of an aluminum head. Don't know how it ever turned out !!
 
There have been many discussions, about an "aftermarket" head over at dot org. Two things seem to derail doing it.
(1) A consensis of what is wanted in the head. The "racers" want certain things, and the "street guys" want something different.
(2)price. This is a small market, and it is not cheap to bring something like this to market. Racers are willing to pay more, then "streeters", but there are still limits.
Remember, most (not all), slanters are "frugal". You can get a factory cast head to work pretty good for $500-$1,000 for a street motor. A "full boggie" race preped head will set you back, in the neighborhood of $1,500-$2,000. I'm of the opinion, that it is not possible to bring to market a "aftermarket" head, anywhere close to these prices. So the head would have to be enough better to justify the higher price.

I hope you can do this, but I will not hold my breath.

PS: How about a combustion chamber design that allows swirl and quench, 4 valves per cyl, cross flow?
 
4 valves per cylinder would probably be the best since you are limited in valve size by the slant's 3.40" bore. Good luck and keep us posted.
 
grumpuscreature said:
4 valves per cylinder would probably be the best since you are limited in valve size by the slant's 3.40" bore. Good luck and keep us posted.
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well i have mine .080 and plan to to the weisco/k1 set up @ 3.504 so thats why i was wondering if a bigger combustion chamber would be beneficial
 
Mike Jefferies did my head,I went with who I thought was the BEST.I think I made the right choice.Told him to build me a head with my combo to get me just in the 11s.He kinda screwed up,I have gone 11.50.Should have told him 10s all motor.VERY easy to deal with.Guzzi Mark
 
madmax/6 said:
Mike Jefferies did my head,I went with who I thought was the BEST.I think I made the right choice.Told him to build me a head with my combo to get me just in the 11s.He kinda screwed up,I have gone 11.50.Should have told him 10s all motor.VERY easy to deal with.Guzzi Mark
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yea i had edd j do mine and it flows really high. over 160 on the exh @150. the jig was messed up for doing the intakes but should be around the 200 mark.
 
Good luck on flowing 250 out of a slant head. 200/190 are great numbers. I think 220 or 230 and 210 Exhaust are the max numbers the Mike has gotten.
Frank
 
66aCUDA said:
Good luck on flowing 250 out of a slant head. 200/190 are great numbers. I think 220 or 230 and 210 Exhaust are the max numbers the Mike has gotten.
Frank
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well if it turns out this thing should be the mother of slant heads!

i have a firend who cnc's platic parts so i think im going to scale one down and make it out of plastic and then full scale plastic.
 
805moparkid said:
yea i think i will talk to him. but my idea is nothing based of a stocker or even needs to be cast!... hehe think on that one...
Click to expand...

Billet?

If you're going to build something like this, there are two possibilities that seem to be most appealing to me. I'd rather have a cross flow head. Not sure about valvetrain layout - a pushrod design could keep a lot of stock-fit parts, be easier to install, and save money, a DOHC 4 valve design would be cool for all out power but way expensive. My vote for the pushrod design would be to use shaft-mounted rocker arms, but in a size that lets you use common rocker arms from some V8.

It would be convenient if whatever was on the driver's side could use a stock manifold, but this may be a bit of a compromise when you no longer have to stick two manifolds on one side. Maybe you could build it so that it used BMW M50 or S50 manifolds on both sides? They're a reasonably common slant six design, although I haven't checked the bore spacing to make sure they'd fit well.

One other thing - a crossflow oveheard cam head absolutely must have provisions for either a distributor drive or a camshaft position sensor for EFI and distributorless ignition. The stock distributor won't be of much use with a crossflow head. (I'm not entirely sure what I'd do with a pushrod / crossflow design. Probably stick a cam sensor in the fuel pump drive slot and replace the distributor with a freeze plug.)

Not sure I'll have the money for one any time soon, but it's a cool idea.
 
MadScientistMat said:
Billet?

If you're going to build something like this, there are two possibilities that seem to be most appealing to me. I'd rather have a cross flow head. Not sure about valvetrain layout - a pushrod design could keep a lot of stock-fit parts, be easier to install, and save money, a DOHC 4 valve design would be cool for all out power but way expensive. My vote for the pushrod design would be to use shaft-mounted rocker arms, but in a size that lets you use common rocker arms from some V8.

It would be convenient if whatever was on the driver's side could use a stock manifold, but this may be a bit of a compromise when you no longer have to stick two manifolds on one side. Maybe you could build it so that it used BMW M50 or S50 manifolds on both sides? They're a reasonably common slant six design, although I haven't checked the bore spacing to make sure they'd fit well.

One other thing - a crossflow oveheard cam head absolutely must have provisions for either a distributor drive or a camshaft position sensor for EFI and distributorless ignition. The stock distributor won't be of much use with a crossflow head. (I'm not entirely sure what I'd do with a pushrod / crossflow design. Probably stick a cam sensor in the fuel pump drive slot and replace the distributor with a freeze plug.)

Not sure I'll have the money for one any time soon, but it's a cool idea.
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Great insite! good to think about!
 
Did you do a search on a "NEW" head discussions there were some good ones in the past over at .org. We even had 20 guys with cash in hand that would buy and for some reason that fell apart. I think that was about 2005 maybe earlyer.
Frank
 
66aCUDA said:
Did you do a search on a "NEW" head discussions there were some good ones in the past over at .org. We even had 20 guys with cash in hand that would buy and for some reason that fell apart. I think that was about 2005 maybe earlyer.
Frank
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yea i have this posted over there to and most just dont get what im looking for what would make a stock head better... haha but some have given me some actual numbers
 
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