6 bolt vs. 7 bolt [merged] 6bolt 7bolt 6-bolt 7-bolt six bolt seven bolt

[asdfzxc]

All 6 bolt vs. 7 bolt threads are merged here.
How do I tell if I have a 6 bolt or a 7 bolt?
Will x part from a 6 bolt fit a 7 bolt?
Will x part from a 7 bolt fit a 6 bolt?
Which one is better?
How do I swap my x bolt for an x bolt?

What is the difference between 6-bolt and 7-bolt engines (aside from the obvious - 6 vs. 7 bolts connecting the flywheel )

Is there an advantage over either of the two engines?

Thanks,

-Mike

 

[dimon2000]

hi
i asked this before but no one really knew about it.
so i have a 1g 6 bolt block and i have a 1g 7 bolt head. it looks the same as my 6 bolt head, only it has 2 extra holes which are oil or coolent not sure. my 6 bolt block doesnt have them and my 6 bolt head doesnt have them. My question is can i just bolt it on and not worry about it. or is there something i have to do in order to make this work.let me know only if you tried this or know for sure. dont guess please.
thanks guys

 

[Cs4g63]

It would be easier to help if you could post a picture of both of the heads and point out where the diferences your talking about are.

 

[Cs4g63]

I honestly have never seen a head that is missing those two holes. Im not being a a$$ but are you sure there isnt any extra gasket material covering them up. It doesnt look like there is but that is weird.

Here is picture I pulled off of Jacksons that shows all of the holes. And the two heads I have in the garage both have all of the holes.

 

[hopwoodp]

As long as it is a 4g63 head, there should not be a problem. I drilled the holes out on my 2g head and it fit the 6 bolt block just fine. The only difference I know of is the exhaust manifold studs are larger on the outside(the two end ones). Thats the only real difference I have ever heard of between the two (1g6bolt and 1g7bolt). So, in other words, you should be fine.

 

[tyger1]

I recently stroked a 7 bolt motor to a 2.3 now i have a 6 bolt motor and wanted to know if i could swap the parts over? I do not want to buy a new stroker kit.

is this possible? if not why? what are the differences between the two blocks?

 

[Cs4g63]

No it is not possible. The crank journals in the engines are diferent.

 

[tyger1]

No it is not possible. The crank journals in the engines are diferent.

i just need the casing. i have a 1g 7 bolt block with a complete stroker kit. I planned on swapping everything over and turning the 6 bolt to a 7 bolt. i know it sounds weird and why would i want to do that but i just need the block itself. will this still work

i plan on swapping everythng over to include the crank

 

[HIGHPSI4]

No. As stated above, a 7 bolt crank will not fit in a 6 bolt block.

 

[spooled_u_1st]

They are not compatible.

 

[yesItsdsm]

Why don't You try swapping the 6-bolt rods and pistons into the 7-bolt block. I beleive some people with 7-bolts swap to 6-bolt rods/pistons for the stronger rods and lower compression.

-Just a thought.

 

[tyger1]

Why don't You try swapping the 6-bolt rods and pistons into the 7-bolt block. I beleive some people with 7-bolts swap to 6-bolt rods/pistons for the stronger rods and lower compression.

-Just a thought.

can i use my forged pistons and rods from my stroker kit on the 6 bolt motor. or do i have to buy a whole new kit?

what else is or is not interchangeable between the two blocks.

 

[2gdanny]

my friend just got an eclipse and i think its a 6 bolt he just got it not for any racing resons its kinda stock and i took some pics at the oil pan im almost 100% sure its a 6 bolt
what do u guys think here some pics

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[/ATTACH]

 

[spooled_u_1st]

I can't tell by looking at the pan but if I could see the exposed bottom end I could tell you for sure.

 

[2gdanny]

i have more pics sens i was the one that took pics ### do you need a pic off just the bottom off the oil pan from the out side?

 

[spooled_u_1st]

No a pic without the oil pan.

 

[2gdanny]

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thats the bottom off it its def not a good one
but goign by the ones i already posted and by this pics on the http://www.vfaq.com i would think it is

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the top images is a early 6 bolt the bottom image is a late 7 bolt

 

[96_charcoal_tsi]

The first pic that you put up is of a 6 bolt.

 

[19Eclipse90]

The first pic that you put up is of a 6 bolt.

+1

 

[forcefed 95]

Another sure way to tell is look at the exhaust mani bolts. If the 2 outter lower studs are the same size its a 6bolt if they are largger than you got a 7bolt.

 

[daren_p]

Another sure way to tell is look at the exhaust mani bolts. If the 2 outter lower studs are the same size its a 6bolt if they are largger than you got a 7bolt.

No, this would be a way to tell which head you have, it won't always necessarly match the bottom end.

 

[Blboettcher89]

dont try to tell by the valve cover either you'll make a fool of yourself...

 

[toyotaturbo]

The picture you put up is definitely a 6 bolt bottom end. It would help if you told us what year car this is in, but the pic you put up is a 6 bolt.

 

[2gdanny]

the guy tolled my friend its a 98 2g with a swap ### the other motor had to manny miles but sens my friend wasnt looking for anything to race and if its a 6bolt ima find him a 7 bolt and keep that 6bolt cuz he got a 240sx but its in the shop he just wants the clipse for a beater.

 

[mitsuclipsegsx]

I blew my engine in my 99 gsx so looking for a 6 bolt, my friend has a 91gsx auto that he is selling. I looked on vfaq, but still cant tell. I looked on the door today it was made Dec of 90, and hear is the pic i took, hopefully 6 bolt.

 

[stealth mullet]

it should be a 6 bolt. i dont know why anyone would swap a 7 bolt from a 6 bolt. but you cannot tell if its a 6 bolt from that pic. feel around the lip (where the oil pan is bolted to the block) of the oil pan just under the harmonic balancer. if its flat, its a 6 bolt. if its slightly rounded, its a 7 bolt.