Re: DSM 6&7 bolt differences
 

The 1g head has MUCH larger ports than the 2g head. Matching the 1g manifold to a 2g head requires the removal of a lot of material. It is MUCH more common to swap a 1g head into a 2g car than the other way. To use a 2g head on a 1g block requires drilling the head bolt holes out also. The geometry of the 2g is better, and can be ported to flow better than a 1g, but its not that way out of the box. 1g head is more biased toward high rpm, and you lose a decent amount of low and midrange when swapping to one from the loss in velocity.

Re: DSM 6&7 bolt differences
 

Meh some people never have there 7 bolts crankwalk some people like my friend manage to have 3 7bolts in a row crankwalk on them :X

Re: DSM 6&7 bolt differences
 

Now that is some fucked up luck.

Re: DSM 6&7 bolt differences
 

well i dont exactly have an extra $1100 to go blow on 7bolt pauter rods and srp Ps darksol, and i know pistons and rods arent the cure for crankwalk thankyou very much, but i was asking what it takes, like rod journal size from 6to7 and is it possible or just out of the question thnx Aero. does anyone know how much to take of .01 .02 .03???
dont have parts in hand or i would figure it out. thnx guys
I have the 7bolt crank and block and have all the internals for a 6bolt so i want to make it work.

Re: DSM 6&7 bolt differences
 

7 bolts suck. 6 bolts are great. If 6 bolts had SBC bolt patterns and fit Honda distributors I'd run nothing else.


Not that it, or aero's alternative perspective, matters. The valves are so shrouded it makes no difference. :)

Re: DSM 6&7 bolt differences
 

right on if only they didnt come in such a clusterfuck tank of a card :3

Re: DSM 6&7 bolt differences
 

I hear yah. My VR4 is a ------- tank at like 3300lbs. :X It's suprisingly how easy it is to get these boats to run 13's for so cheap though. BUt then the DSM reliability issue peaks it head in and then :X

Re: DSM 6&7 bolt differences
 

Rod journals are the same diameter, it is width that is the issue. For some reason I can't find the exact dimensions, I used to have them. You should be able to measure the width of the two and determine how much material to remove. If that doesn't work for you I'll do a little more looking.


The 98-99 7 bolts aren't bad, they moved to the separate thrust washer and eliminated most of the crankwalk issue. The 7 bolts do have some positives, one piece main girdle that stiffens things up for one.

Re: DSM 6&7 bolt differences
 

got 2 buddy's with a gsx, and tsi.. think there both 97's. and yes, both have crank-walked. DSM FTL

we got a local shop here that does nothing but dsm's, they wont even touch the 7 bolt motors just from the crank-walk issues

Re: DSM 6&7 bolt differences
 

+1,000

You can run 1g rods in a 2g 7bolt crank/block, the wrist pin diameter on a 6bolt rod is 21mm, it must be enlarged to 22mm 7bolt size. thats it.

1g head has larger ports and FLOWs better at lifts higher than .300 than the 2g weenie ass head.

I wish i didnt have all this useless dsm knowledge stored up. Someone hit me over the head.

DISCLAIMER: I do not support the building of any dsm whatsoever. They are parts cars for me to poop on. :P