Hi everyone, first I want to thank everyone for all of the tips and suggestions you have given my 12 yr old son and I towards building our first Mopar. We have followed them and the Dart Gt is running great!!. I would like to know if anyone has thoughts on cylinder head. We have a internally stock 225 with Supersix intake and 2 bbl carb. I have installed a stock electronic distributor and a set of Dutra duals with 2 1/4 dual exhaust all the way out. I would like to install a Erson cam, suggested by this forum, and rework the head. Would it be more cost effective and better to replace the head with a version from a supersix motor? I believe I had read somewhere that a Supersix head had better flow, larger valves and nice chamber design. Any comments are greatly appreciated. Thanks Ed & Jeremy

There is no difference between the heads used on 1bbl engines and the heads used on 2bbl ("Super Six") engines. Don't know where you read what you read, but it's wrong.

There's a much wider range of spark plug options for the pre-1975 heads, which also allow you to replace the lifters (and therefore the cam) without removing the head — this cannot be done with the '75-up heads.

What sort of reworking do you have in mind for the head? Does it need repair work...? What makes the head the next thing on the upgrade list?

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Too many people who were born on third base actually believe they've hit a triple.

Hi Dan,Thanks for reply. I wanted to clean-up the upper end of motor. I believe there is quite a bit of carbon deposit on valves and in chamber area. Motor runs great and does not smoke at all. I was going to redo or replace head because I thought head had to be removed to replace cam. It would be great if I could avoid removing head. My cyl-head does have the spark plug tubes. Do you know of anyway to clean-up carbon deposits without removing the head? Actually the only other upgrade to motor that we wanted to do was the cam/lifters. It is a daily driver that has really come to life with the few mods we have done. Thanks, Ed & Jeremy

I believe you need a lifter removal tool to be able to do that, they are cheap and most parts stores have them, sometimes a strong maganet can be used. You can get a upper intake cleaner that is used mostly on EFI cars and run it through the intake and it can help remove most of the carbon. Plus after doing this you can dribble water down the carb while it is running & the engine hot and this will remove what carbon is left. I would use the upper intake cleaner first because it will soften the carbon up ( read directions and follow). This proccedure will scare you when you do it because it will smoke very much, but it is suppost to.


There may be some small differances in the latter heads depending on what year your head is. The one main diff would be having hardened valves seats. This may only be on the exhaust side I am not sure but its a good thing to have, but not a nessary thing. It also has no gain in performance, its just suppost to be a bit tougher. I would recamend removing the head anyway and doing a little work to it. A good three angle valve job and opening the bowls up will gain a lot of power to go along with that new cam. Ofcourse it doesnt have to be done but it will be well worth the effort even if just using the stock valves. With the two barrel carb and the duel exhaust it will really like a little head work. And it really want matter what head you use.


Jess

Hi Jess, Thank you very much for your info. I will pick up cleaner and get to it. Thanks again. Ed & Jeremy

The hardened valve seats are needed with unleaded gas. They will likely burn otherwise. I had two engines without the hardened seats burn the valves seats with unleaded gas. Hatrdened seats were intriduced in the later part of the 72 model year, so all 73 and later heads have the valve seats inductance hardened. You can have hardened seats installed when the head is done. Once new seats are installed you have no worries. There may be an additive you can put in to prevent the valve seat burning. I am not sure about that though.

Sam

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Hi Sam, Thanks for info. I did'nt think of the issues with unleaded. Looks like head should come off for reworking. Thanks again, Ed & Jeremy

It's not quite that simple. See here .

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Too many people who were born on third base actually believe they've hit a triple.

The particular combustion chamber cleaner you want to find is BG 44K. Try hard not to settle for a substitute. Instructions are here.

Detailed instructions for the water method are here

It's your call and your option, of course, but nothing you've said indicates to me that the head needs to (or should) come off at this time.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Wow! Thanks for the link. It really opened my eyes to things I thought were true. You guys are great! Thanks again. Ed & Jeremy