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18 degree heads on a street engine

  
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Bill

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Since: May 05, 2005
Posts: 10



(Msg. 1) Posted: Wed Oct 26, 2005 12:18 pm
Post subject: 18 degree heads on a street engine
Archived from groups: rec>autos>rod-n-custom, others (more info?)
Hi-

Have a chance to purchase a set of 18 degree heads, shaft rockers &
roller lifters, all brand new, and a set of used titanium valves in good
shape at a good price. The intakes are big (2.18 inches) and I think the
exhausts were 1.625s. Intake runners are 210. Would it be feasible to
use these in a 377 or 406 sized engine on the street and expect any
drivability at all? The cam would be under .600 lift (maybe mid 500's)
and the duration would not be awful. The car is a mid engine McLaren
replica and weighs in around 2000 pounds with a 5 speed transmission.
Considering the limited choice of intakes, among other things, it's
certainly not a practical choice but then hotrodding isn't born out of
practicality. I'm leaning toward doing this unless there's a good reason
not to. I don't know exactly what I'd use for an intake but it would be
some form of EFI or Weber/Dellorto/Solex type stuff. Not a 4 bbl.

It's be great to see some opinions...

thanks,
Bill

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Stan Weiss

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Since: Sep 01, 2003
Posts: 49



(Msg. 2) Posted: Wed Oct 26, 2005 1:21 pm
Post subject: Re: 18 degree heads on a street engine [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
A 2.18 is a very large valve but a 210 cc intake volume is not that big
the two numbers do not go together. I would think one or the other is
not correct. Do you have an flow numbers for the heads.
Stan

Bill wrote:
>
> Hi-
>
> Have a chance to purchase a set of 18 degree heads, shaft rockers &
> roller lifters, all brand new, and a set of used titanium valves in good
> shape at a good price. The intakes are big (2.18 inches) and I think the
> exhausts were 1.625s. Intake runners are 210. Would it be feasible to
> use these in a 377 or 406 sized engine on the street and expect any
> drivability at all? The cam would be under .600 lift (maybe mid 500's)
> and the duration would not be awful. The car is a mid engine McLaren
> replica and weighs in around 2000 pounds with a 5 speed transmission.
> Considering the limited choice of intakes, among other things, it's
> certainly not a practical choice but then hotrodding isn't born out of
> practicality. I'm leaning toward doing this unless there's a good reason
> not to. I don't know exactly what I'd use for an intake but it would be
> some form of EFI or Weber/Dellorto/Solex type stuff. Not a 4 bbl.
>
> It's be great to see some opinions...
>
> thanks,
> Bill

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Bill

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Since: May 05, 2005
Posts: 10



(Msg. 3) Posted: Wed Oct 26, 2005 2:00 pm
Post subject: Re: 18 degree heads on a street engine [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Stan Weiss wrote:
> A 2.18 is a very large valve but a 210 cc intake volume is not that big
> the two numbers do not go together. I would think one or the other is
> not correct. Do you have an flow numbers for the heads.

Nope but according to the casting number & GM Specs, the 210 is correct
although the ports needed finishing. I assume the 210 is referring to
the approximate port size after machining/porting and the real valve
size is set up. I agree that the valves are way big but that was
correct size. At any rate- I just called to verify the size and found
out they were sold. The casting number was 10134363 "Hi Port 18 degree".

thanks for answering.
Bill

> Stan
>
> Bill wrote:
>
>>Hi-
>>
>> Have a chance to purchase a set of 18 degree heads, shaft rockers &
>>roller lifters, all brand new, and a set of used titanium valves in good
>>shape at a good price. The intakes are big (2.18 inches) and I think the
>>exhausts were 1.625s. Intake runners are 210. Would it be feasible to
>>use these in a 377 or 406 sized engine on the street and expect any
>>drivability at all? The cam would be under .600 lift (maybe mid 500's)
>>and the duration would not be awful. The car is a mid engine McLaren
>>replica and weighs in around 2000 pounds with a 5 speed transmission.
>>Considering the limited choice of intakes, among other things, it's
>>certainly not a practical choice but then hotrodding isn't born out of
>>practicality. I'm leaning toward doing this unless there's a good reason
>>not to. I don't know exactly what I'd use for an intake but it would be
>>some form of EFI or Weber/Dellorto/Solex type stuff. Not a 4 bbl.
>>
>> It's be great to see some opinions...
>>
>>thanks,
>>Bill
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Tim45

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Since: Nov 07, 2003
Posts: 9



(Msg. 4) Posted: Thu Oct 27, 2005 12:55 pm
Post subject: Re: 18 degree heads on a street engine [Login to view extended thread Info.]
Archived from groups: alt>autos>rod-n-custom, others (more info?)
Hi,
Low end torque will suffer - but you know that already.

If you are building for street manners why hobble your efforts with
inappropriate heads? There's really no "cool factor" doing this. Just bad
engineering.

I see two logical choices:

1.) If you want a street friendly engine sell these heads to someone who can
use them and build a street engine.

2.) If you want cool factor then use these heads to build a hi revving
screamer. Your light car does not require stump pulling torque. A screamer
is appropriate for the style of car. Gear it low and use loud mufflers. 8500
RPM really sounds good with loud mufflers.

Just my opinion.

Cheers,
Tim
www.racetec.cc
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