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Forums->Hot Heads Tech Talk->270 Dodge Red Ram Big Valves

mrdirt
270 Dodge Red Ram Big Valves


For discussion:

I have a 270 Dodge in a '58 Morris Minor tudor. Building an 'Old School' gasser . I chose the baby hemi "solely on size and looks", not necessarily for 'speed'! I originally had a worked over 302 Ford which probably would have made this a real tire burner!

So I went with the Dodge installing a hot cam and 3-deuces, headers, etc Complete engine rebuild, etc. I didn't modify the cylinder heads, just new valves, springs, etc. etc.

Now the topic for guidance / discussion: what can be done to the 270 heads for maximum performance? Bigger valves, if so how big? Does anyone have experience modifying 270 heads? What performance increase can I expect?

The whole purpose is to squeeze as much horse power out of 670-pounds of cast iron!

...............and members, don't suggest a big bad Chrysler hemi! I need to lose 50-lbs. before I can fit in this to drive it with the 270!

Thanks to all especially Bob, Eric, Deb at Hot Heads Research for a great web sight and great service!

Mr. Dirt
  user offline
on: Fri 05 of Jan, 2018 [15:10 UTC] reads: 2633

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DaveBlakeman
user offline
Re: 270 Dodge Red Ram Big Valves
on: Mon 15 of Jan, 2018 [18:15 UTC] score: 0.00
Dodge270 intake dia. 1.75 ex -1.41 Dodge 315 Intake -1.87 ex 1.53 ..

author message
George
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Re: 270 Dodge Red Ram Big Valves
on: Fri 05 of Jan, 2018 [21:55 UTC] score: 0.00
I'm assuming you're putting in 10:1 pistons....All Dodge heads interchange so high deck heads will give you more ports & valves.

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mrdirt
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Re: Re: 270 Dodge Red Ram Big Valves
on: Sat 06 of Jan, 2018 [03:35 UTC] score: 0.00
> I'm assuming you're putting in 10:1 pistons....All Dodge heads interchange so high deck heads will give you more ports & valves.

George,
I have 9.5:1 pistons. What does C.R. have to do with valve diameter?

I understand from a source that the 315 - 325 cylinder heads on a 270 block will have coolant alignment hole issues = water leakage???

270 heads have shorter runners as well. Thus my looking at bigger valves in a 270 head.

Still haven't heard from anyone who has put bigger valves in a 270 or what sort of performance gains were made?

I can't be the first person who wants to modify a set of 270 heads in order to maximize power output?

Thanks again.
Mr. Dirt

author message
George
user offline
Re: Re: Re: 270 Dodge Red Ram Big Valves
on: Mon 08 of Jan, 2018 [16:03 UTC] score: 0.00
> George,
> I have 9.5:1 pistons. What does C.R. have to do with valve diameter?
>
nothing, just in reference to trying to make a 270 a tire burner vs the low OEM C/R.

On thev now defuct Webrodder site they sucsessfully used 241 heads on a 315. Unfortunatly I don't remember if they put bigger valves in or not. Some people have advocated using low deck heads for higher port velocity vs more potential flow with the high deck heads.


author message
mrdirt
user offline
Re: Re: Re: Re: 270 Dodge Red Ram Big Valves
on: Thu 11 of Jan, 2018 [19:56 UTC] score: 0.00
> > George,
> > I have 9.5:1 pistons. What does C.R. have to do with valve diameter?
> >
> nothing, just in reference to trying to make a 270 a tire burner vs the low OEM C/R.
>
> On thev now defuct Webrodder site they sucsessfully used 241 heads on a 315. Unfortunatly I don't remember if they put bigger valves in or not. Some people have advocated using low deck heads for higher port velocity vs more potential flow with the high deck heads.
>

Good points George! I guess the best solution is to install bigger valves in my 270 heads. I'd like to get some specs. from some one regarding what I / E valves to buy? Hopefully someone has bought valves and components before?
Thx.
Mr.Dirt

author message
mrdirt
user offline
Re: 270 Dodge Red Ram Big Valves
on: Fri 05 of Jan, 2018 [15:11 UTC] score: 0.00
> For discussion:
>
> I have a 270 Dodge in a '58 Morris Minor tudor. Building an 'Old School' gasser . I chose the baby hemi "solely on size and looks", not necessarily for 'speed'! I originally had a worked over 302 Ford which probably would have made this a real tire burner!
>
> So I went with the Dodge installing a hot cam and 3-deuces, headers, etc Complete engine rebuild, etc. I didn't modify the cylinder heads, just new valves, springs, etc. etc.
>
> Now the topic for guidance / discussion: what can be done to the 270 heads for maximum performance? Bigger valves, if so how big? Does anyone have experience modifying 270 heads? What performance increase can I expect?
>
> The whole purpose is to squeeze as much horse power out of 670-pounds of cast iron!
>
> ...............and members, don't suggest a big bad Chrysler hemi! I need to lose 50-lbs. before I can fit in this to drive it with the 270!
>
> Thanks to all especially Bob, Eric, Deb at Hot Heads Research for a great web sight and great service!
>
> Mr. Dirt

author message
jgrady
user offline
Re: Re: 270 Dodge Red Ram Big Valves
on: Mon 22 of Jan, 2018 [21:01 UTC] score: 0.00
> > For discussion:
> >
> > I have a 270 Dodge in a '58 Morris Minor tudor. Building an 'Old School' gasser . I chose the baby hemi "solely on size and looks", not necessarily for 'speed'! I originally had a worked over 302 Ford which probably would have made this a real tire burner!
> >
> > So I went with the Dodge installing a hot cam and 3-deuces, headers, etc Complete engine rebuild, etc. I didn't modify the cylinder heads, just new valves, springs, etc. etc.
> >
> > Now the topic for guidance / discussion: what can be done to the 270 heads for maximum performance? Bigger valves, if so how big? Does anyone have experience modifying 270 heads? What performance increase can I expect?
> >
> > The whole purpose is to squeeze as much horse power out of 670-pounds of cast iron!
> >
> > ...............and members, don't suggest a big bad Chrysler hemi! I need to lose 50-lbs. before I can fit in this to drive it with the 270!
> >
> > Thanks to all especially Bob, Eric, Deb at Hot Heads Research for a great web sight and great service!
> >
> > Mr. Dirt


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