6/7bolt

Is there any difference between a head that came off a 6 bolt motor then a 7bolt motor? i.e can a head that came off a 6bolt motor fit on a 7 bolt block?

it is the same motor yes you can use the head off of a 6-bolt on a 7-bolt you should search first

it is the same motor yes you can use the head off of a 6-bolt on a 7-bolt you should search first


It may be a good idea for you to also do some searching.

You are correct that a head from a 6 bolt motor will fit onto a 7 bolt head, however the stud holes will be larger then need be in accepting the bolt size which creates room for moving. This is never an issue when you have the guides installed anyway. As stated, the differences include the size of the head bolt holes, (which are 11mm for 7 bolts, and 12mm for 6 bolts respectively), and their flow characteristics, which is a different story. Thus, you won't be able to put a 2g head onto a 1g motor, at least without modification. I have successfully installed a 2g(7bolt) head onto a 1g(6bolt) block. What has to be done to do this is the stud/bolt holes in the head will need to be drilled out 1mm more to accept the 6 bolt(12mm) studs/bolts.

Therefore, the swap only goes one way, unless you put some work into it.

It may be important to note that not all 1G's are 6 bolt. I believe that only the 1990-1992 were. 93-94 are 7 bolt.

It may be important to note that not all 1G's are 6 bolt. I believe that only the 1990-1992 were. 93-94 are 7 bolt.

This is absolutely true. I was assuming that this was known, but I guess it was worth throwing out there.

thing is im looking to put a head off a 90 (of course its a 6bolt) on my 7 bolt block cuz i kno someone that had the valves bent on it so i could get it for cheap, plus i only want the shell of the head to fully rebuild it so i dont wannt pay $150 + for a head that im going to tear apart and put bak together with all different parts. Thanks for the help

Taking a 6 bolt head and installing it onto a 7 bolt block is a commom upgrade. Therefore yes you will perfectly fine doing this. If he is looking to make any good power, investing in a good set of ARP's would be wise as well. Good luck!

About how much do the apr head studs run i will be needing some of those

They usually cost ~100 bucks. Worth every penny.

you could also look into getting a 1g head from a 92.5-94. it will still have all the items you are looking for but will have the smaller diameter bolt holes etc. it still has the larger ports etc with none of the downsides.