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Tractor Pulling Discussion Forum

chad s. ??? 301 ihc

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dale d.

12-15-2007 17:17:35

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chad, i have a 301 [414 cid]. stock cam,head opened up and biger valves.running stock rpms.i do have a 308 truck motor.i see the intakes are larger ports.is this the head your taking about? and would this be better for my motor? it run,s on lp gas.

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12-16-2007 07:41:32

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 Re: chad s. ??? 301 ihc in reply to dale d., 12-15-2007 17:17:35  
Id say it could raise your compression ratio by 2 points easy. The valves are the same as the tractor heads, and can be swapped out. If your engine is 200 psi and over, right now,,, id say the cyl pressure would estimate to be 250 to 275 with this one,,, If LP will firethat high of cyl pressure, then you might get away with it,, but may have to run it on a very high octane fuel. Or, replace the cam with a bigger profile, and a big overlap to deflate the excessive cyl pressure and run the same fuel. That route, your taking advantage of the larger ports to help get the air in and out.
Did they make an LP head like this for the tractors? Well, I have found part numbers off combines,,, and they arethe same casting as the tractor,, they did however change the piston,,, LP pistons, high alt LP pistons, were the choice,, and greatly increased cyl pressure. Just cant find a set of these new now days,, so the best option is a flat top piston of aftermarket choice. But no, I have not found any tractor heads or power unit LP engines that have had this configuration. Would it help a big ci engine? yes, if you keep the cyl pressure down to a resonable level, tune a cam and induction system to it and would pick up quite a bit. The head in the picture, has been gasket matched, nothing more, didnt need it to anymore,, JMHO,,, Chad

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dale d

12-16-2007 04:09:33

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 Re: chad s. ??? 301 ihc in reply to dale d., 12-15-2007 17:17:35  
one more thought, the 301 i look at as a closed chamber head. the 308 and the one in the picture seems to be an open.will this affect the compresson?

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Devin in Mo

12-15-2007 22:37:52

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 Re: chad s. ??? 301 ihc in reply to dale d., 12-15-2007 17:17:35  
I got a Question for Chad also was there a lp head for the 301?

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