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Tractor Pulling Discussion Forum

H Engine Upgrades

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InfdianaRed

10-21-2006 04:43:00




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Hoping Chad or any of you other red guys could tell me. Getting ready to reassemble my H. Had my gasoline head checked and worked and milled 20, valve grind, block cleaned up and had no problems with it. I'm going to put a 350 cam in, and FC pistons. Everyone has said the cam is just a straight swith with no mods necessary? Want it to be a work tractor than can pull pretty good too. Also thinking of putting a 350 manifold on too. With gas head and 350 cam and domes, will this combo create any problems with pistons hitting valves? And this isn't too much to do to a work tractor is it?

Thanks,

Brian

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mark_ih4ever

10-21-2006 09:57:31




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 Re: H Engine Upgrades in reply to InfdianaRed, 10-21-2006 04:43:00  
If the piston dome is off to the side (the 'h' high altitude kit or fire crater kit)then you should have no problems with the stock h head.. These pistons should be the same size (diameter) as a 350 and a thinner sleeve to install. As far as swaping the cam I think you'll find minimal difference. I recently put a 400 cam in my super m, I did have problems getting it to work the same...seemed to work worse at first. Also you've got enough meat to deck the head: 0.100 " of an inch and it will be reliable for farming....this ain't no wimpy massey.

Hope this helps

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ChadS

10-21-2006 09:24:34




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 Re: H Engine Upgrades in reply to InfdianaRed, 10-21-2006 04:43:00  
If the engine kit you installed is for the H, the domes should be a half moon shape dome,, no problems with anything hitting, if it has firecraters, you will have to notch the combustion chamber on the intake side so they will clear. Not hard to do, plenty of meat to remove,, The cam is a direct swap. no problems with valves hitting,, What did you do, put in a 350 piston kit to get firecrater pistons? Chad

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IndianaRed

10-21-2006 11:18:52




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 Re: H Engine Upgrades in reply to ChadS, 10-21-2006 09:24:34  
No, I actually haven't ordered my kit yet, but I'm ready to. Everything is done at the shop, and I just read that the 350 cam helps a little, and I thought it would be an easy swap, so why not. But now I'm concerned about this dome issue. Should I just get regular stepped pistons so I don't have to carve off some head, or what? I read also that the firecraters aren't as tall as the 8k altitudes or even the 5k's so it's seems strange that they would hit the head. What head were they made for, just the distiliates?

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ChadS

10-21-2006 12:49:04




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 Re: H Engine Upgrades in reply to IndianaRed, 10-21-2006 11:18:52  
More lift and duration VS the H cam. If it was me, I would go with the 350 kit,,,, sure, you have to bore the block, and recut the flange on sleeve to fit the H block. Good strong engine though. Cut the slant in the H head,,, its not hard to do,,, I can get you a picture of what you have to do,,, Stepped head pistons were made for the H's,,,,any H head and H piston combo will work with no problems,,, firecraters,,, they required a different head chamber,,, SH's had a 8043DD head,, which was an Identical casting to the 350 head,,, but uses the old 4 digit H casting code, firecrater compatible,,, Id go for the 350 kit,, cut the chamber,,, and enjoy. What casting is your H head? Chad

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IndianaRed

10-21-2006 14:41:05




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 Re: H Engine Upgrades in reply to ChadS, 10-21-2006 12:49:04  
Hey Chad,

My head is an 8043, but I don't think it had a DD after, I think just one D. Isn't that a regular gasoline head?

I don't know about boring her out, may be more than I wanted to get into. I'm paying a shop to do the work, and I don't have enough $$ to do everything I'd like to. Just wanted to add a little extra giddy-up. With that in mind, should I even bother with the 350 cam? Gotta make my mind up soon and order the parts. Like I said, the cam just seemed like an easy thing to do, so I put an ad in the classifieds and found one for just $85 from a fella in MO. Thought I'd go woth that and a 350 manifold, but keep the pistons to 3 7/16.

Thanks again,

Bri

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ChadS

10-21-2006 15:04:15




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 Re: H Engine Upgrades in reply to IndianaRed, 10-21-2006 14:41:05  
Gas head. That will be a good engine! Put a bigger manifold on it, new is best,, they have the flange holes slotted to use both carbs,,, think of keeping the H carb,,, too big of carb, it drops too much vaccum and you lose low end power. Any stepped head piston kit you find will be alot better if it had flat top pistons to start with,,, Check the governor for wear, look at the weights in the distributor,, under the points plate,,, those stick, or break the springs, or just run wild and float around,, really throw the timing off,,,,, rocker arm tips,, if they have wear, try using a belt sander to smooth them out. are they assembling the whole engine and you dropping it in? or?? Chad

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IndianaRed

10-21-2006 15:51:45




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 Re: H Engine Upgrades in reply to ChadS, 10-21-2006 15:04:15  
Yep, gas head, and I am going to put a new manifold on too. Was just looking on here the one they list for the H is the same as the 350, so that's good. Had heard that I might want to go with a bigger carb, but what you say makes since on that. My gov needs redone too, so I'll be getting that kit and maybe a little stronger springs. I've always planned on putting it back together myself, but the shop is pushing me to let them, of course. But I like them a lot. Even though they work mostly on cars, he seems to know a lot about everything, and he isn't trying to get rich on me. Cleaning, fluxing, valve grind, seats, etc, on the head he charged me $145, so that seemed pretty reasonable to me. So I might just let them put it back together. Although that seems like the fun part to me and I still kinda want to myself. So do you think the 350 cam will help enough to make it worth doing? Then the 350 manfold, stepped pistons, lightly milled head (.020), sound good?

Brian

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