I was hoping someone had some detailed information as to why it is rumored to be detrimental to shave/cut a notch on the block to clear a ramhorn mani to clear ac?

Could anyone shine some light on this topic?


thanks in advance!

 

i've done it. don't see any issue with it unless you take a lot off.

 

many people have done it, sometimes manifolds are mocked up on LS heads, or vtec heads and sent out to people with the complete opposite and the flanges sometimes touch it, you can grind it down just dont go overboard, same goes for the block as well

 

I've seen done a few times myself.

 

I know people have done it...i have done it myself twice and have seen no real problems...


Except i have heard it can cause heat issues!? doe anyone have any concise data proving this?


BUMP! I just dont want to shave my 3k block if it REALLY hurts it to put a an AC kit just cuz i am stubborn!! LOL


thanks for the quick replies

 

Also what would be considered a lot?

Pictures are worth a thousand words! anyone have examples of what seems to be areasonable amount to take off?


thanks!

 

I have never heard of having to shave off a part of the motor to fit a mani. What mani are you runing?

 

starting to think some of you guys werent in the turbo game back in 1998 when it was bout revhard and drag kit -- in which case cutting stock radiator fans and fitting / block notching was a must do to go turbo with AC

 

Done it many times in the past and did it on the Hot Rod to clear the turbo with no detrimental issues. Just take out enough to allow header flex or heat growth and you should be ok.

 

The manifold i am running is a PEakBoost AC unit...with my last setup i ran a T3/T4 57 trimm and we did trim to fit. Didnt see any issues,,,

But now i will be hacking away at it quite a bit more to fit a T3/GT40...


The reason i am worried is this is a block that will soon hold my (FULL-RACE) Top MOunt Twinscroll mani with a BW Bullseye S368 race cover setup....i want to make sure i dont weaken it by rushing and just getting my car running now...until i am ready to make tranny breaking POWA!! LOL

Well...I am going to do it Fck IT!

 

Just buy a full-race

I am pretty sure you are going to have problems with the twin scroll top mount also.

 

DONT CUT TOO DEEP

 

be carefully when cutting

 

I ran the peakboost twinscroll topmout on an LS/vtec 2 years ago, had a 42R on it, and did not have to cut the block at all. Only thing i had to trim was the core support, and I didn't really have to, i just did it for easier removing of the turbo.

 

with my full race ram horn with my b16 head and gsr block their was some shaveing of the block we had to do to make it fit

 

 

This is what frustrates me....


No one really has any data proving or showing that it is BAD to cut/shave the block!!!

I have heard that that area in the block which is going to be cut is used for heat expansion/cooling....if hacked away than it will essentially create a hot spot!???

Anyone have technical proof to this being true/false?

thanks! I dont want to ruin my ERL BLING BLOCK!! LOL

 

I have a full-race top mount twin already...JUST ran into some money issues and need to just get the car running so wife can get to work. Leaving me with no money to finish the my Full Race build

WOuld still need a 4 inch DP
New IC piping and twin 44mm gates...dont have that right now.

 

I dont think anyone has really stress tested the frontal surface area of a honda block with strain gauges as you are asking for. I dont like to grind and especially if there is a chance you can out a hole in the front of the engine with a grinder. That is not what you want to do, cause then your wife is deff not getting to work

 

I had to grind off the little edges of my GSR block to fit my Full Race top mount. Its not a big deal.

 

Does anyone have pics of the grinding that was required to fit the top mount twin scroll Full-Race mani? I've had mine for a long time and I never had to grind anything... Thanks!!

 

Haha, reading this title I immediatly thought of the old days when we sold hella Drag kits. But that was back then, with the variety of manifolds and turbokits out nowadays for hondas (more then any other make hands down) I really don't see why cutting/knotching blocks should be a normal practice anymore......

 

I agree...this should not be a normal practice anylonger...I guess Ken had to design it this way to allow ac and an equal length manifold to fit.

But like MILLER says it does worry me...


I cant merit the risk of damaging a 3.5k block when i will change my setup within a few months anyway...Thanks everyone! I will just put the T3/T4 and only shave a bit off...and save the money and put it towards MY PPG GEARS!

 

Im not sure how much or why you have to cut down the block, but from what it sounds like its minimal at best. So you are running a top mount and ac, with a s368 as a daily? Lets see some pics as to what you are looking to cut...

 

I believe he wants to run a ramhorn with AC now and the top mount with s368 in the future