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Tractor Pulling Discussion Forum

Oliver 88 valves and head work

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09-21-2010 18:04:18

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I have a 88 oliver 283 cid gas. bigger cam 880 head milled 80 thousands with stock valves in it also have big carb and big ported intake , head ported as well. My question is that is it worth the money to run bigger valves in it now. Cid is not that much over stock and how much power do you think I would gain running 10% over on rpm's with bigger chevy valves. Tractor does not have enough power to run second gear like I would like. pulling 5500-6000 pounds.

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Cody Adgent

09-21-2010 21:12:48

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 Re: Oliver 88 valves and head work in reply to J88puller, 09-21-2010 18:04:18  
if you clean up you ports and put some bigger valves in the head, you should see a few HP. Move your intake valves over to the exhaust and put a set of 360 Dodge exhaust valves in for the intakes. Get a new set of Dodge keepers (same as factory oliver) order a new set of 460 IH valve springs and use a set of 460 IH retainers. There are two things to remembers..#1 the head you are using was designed to feed a smaller cube engine at less RPM so anything you do to help it compensate will help. #2 bigger isn't always better. I have torn down numerous heads that have came in on pullers over the years that have had a great big vlaves in them. Some were even cut over into the combustion chamber wall. When I pulled the valves out, there was a small hole under it, one head even still had the stock seat underneath the larger valves... Some mild porting will go a long way, raise the roof of the exhaust port roof a little, bore the intake runner out to 1.125, and just blend everything in well. Anther thing, did you degree the cam in after you had it reground???.... Hope this helps.

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09-22-2010 17:49:31

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 Re: Oliver 88 valves and head work in reply to Cody Adgent, 09-21-2010 21:12:48  
Cody Adgent, I have another question for ya shoot me an email with your phone # please

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09-22-2010 12:12:07

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 Re: Oliver 88 valves and head work in reply to Cody Adgent, 09-21-2010 21:12:48  

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Cody Adgent

09-22-2010 17:47:05

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 Re: Oliver 88 valves and head work in reply to 1965lonewolf, 09-22-2010 12:12:07 or 931-212-3602.


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09-21-2010 20:33:39

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 Re: Oliver 88 valves and head work in reply to J88puller, 09-21-2010 18:04:18  
need to find a 6 or 12 port head for the 283, not the 265, and cut it down .080 and punch the bore out to .030 over. it wont give you enough to get the 6000 in 2nd but would have plenty for 4500 5000 and 5500

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09-21-2010 19:01:24

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 Re: Oliver 88 valves and head work in reply to J88puller, 09-21-2010 18:04:18  
that would be hard to say if it would help our not,probably not, i have a 327ci. oliver with intake valves and it barely has enough has enough power to run 6000 in second gear wouldn,t try it on a power track would probably kill it, but seems like you did every thing else might as well put biggeer valves in it and try put intake valves to exhaust and put bigger valves on intake side i heard chrysler valves would work bb chrysler has 3-8 valves

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09-21-2010 19:03:34

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 Re: Oliver 88 valves and head work in reply to MIKE BOCK, 09-21-2010 19:01:24  
putting bigger valves in is usually first thing i do

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