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Is anyone running Olds 3 port OHV head on their T
Posted: Wed Jan 15, 2020 2:46 pm
by steve plowman
Looking for info on Olds 3port head conversions on a T block. What cam works? and what rocker ratio? Apart from the obvious adapter plate and hardware what else did you have to do to make it work? And performance wise what were the gains?
So many questions
Re: Is anyone running Olds 3 port OHV head on their T
Posted: Wed Jan 15, 2020 3:04 pm
by Henry K. Lee
Yes, and a lot of answers! LOL
Stock 1 to 1 ratio rockers, 280 works well. The valve guides need to be cut down to the height of the head. There are more but depends on other factors such as compression ratio, carburetor, porting, and change in valve size.
All the Best,
Hank
Re: Is anyone running Olds 3 port OHV head on their T
Posted: Wed Jan 15, 2020 7:21 pm
by Henry K. Lee
Here you go Steve,
Make a simple tool from bimetal hole saws. This will get you to a correct plumb dimension for small block Chevy valve springs.
This is a fly off with plate reattachment to change to ratio from 1 to 1 to 1 to 1.375 using a 260 cam.
Develops around 280 CFM with over size valves on the flow bench.
Re: Is anyone running Olds 3 port OHV head on their T
Posted: Wed Jan 15, 2020 7:22 pm
by Henry K. Lee
Now Shut up and HANG ON!
Hope this Helps,
Hank
Re: Is anyone running Olds 3 port OHV head on their T
Posted: Wed Jan 15, 2020 10:53 pm
by frontyboy
Did this a while back on a speedster. I found a 4 cylinder 1928 Chevrolet cam will give more lift that a stipe cam at little or no cost. You take the model t cam bearings out at turn the Chev cam bearing surfaces down to run the cam on the Ford cam bores. If memory serves I think you get a 180 lift.
I presently am building a Fronty overhead speedster and using a 4 cylinder Chev cam in this one as well. The Chev cam works well with a 3 port head it opens the valves longer and breaths better. Makes a nasty sound when running if you do a bit of porting and fab a easy bend open intake, Also a free flowing exhaust helps a great deal.
good luck
frontyboy
Re: Is anyone running Olds 3 port OHV head on their T
Posted: Thu Jan 16, 2020 3:25 am
by steve plowman
Henry K. Lee wrote: ↑Wed Jan 15, 2020 7:22 pm
Now Shut up and HANG ON!
Hope this Helps,
Hank
Thats a great help. To summarise,
- you milled the rocker stand shafts off to fit the new higher ratio rocker assembly _ what was that off?
- used the start cutter tool to take down the valve guide and fitted SBC valves? and springs?
- fabbed and fitted a funky custom built 3 branch manifold
Looks great
did you use chevy 4 push rods?
Im hanging on, i can't shut up
Re: Is anyone running Olds 3 port OHV head on their T
Posted: Thu Jan 16, 2020 3:27 am
by steve plowman
frontyboy wrote: ↑Wed Jan 15, 2020 10:53 pm
Did this a while back on a speedster. I found a 4 cylinder 1928 Chevrolet cam will give more lift that a stipe cam at little or no cost. You take the model t cam bearings out at turn the Chev cam bearing surfaces down to run the cam on the Ford cam bores. If memory serves I think you get a 180 lift.
I presently am building a Fronty overhead speedster and using a 4 cylinder Chev cam in this one as well. The Chev cam works well with a 3 port head it opens the valves longer and breaths better. Makes a nasty sound when running if you do a bit of porting and fab a easy bend open intake, Also a free flowing exhaust helps a great deal.
good luck
frontyboy
Thanks, useful info, Im getting a full '28 Chev 4 motor in the deal but it will be going on a T oil pan with a T trans in a Gerber style track car.