Pic of the Summit .250" thick mid engine plate, I cut the tabs off of the plates ($47)

Also, I bought an Extra long Pilot Bushing ($15), this is basically .250" longer than the stock Pilot Bushing so it allows for the input shaft to engage the bushing well. The input shaft tip penetrates the Pilot bushing .375"




It is 2.060" from the tranny mount face to the Howe 82876 TOB face

It was 2.250" from the Bell housing / Tranny mount face to the PP fingers, so I used one .045" thick spacer that HOWE provides with their TOB, ( box of spacers )

I took the 2.250" and deducted the 2.105" (2.060" + .045" spacer) ...... So I get an AIR GAP of .145" between the fully retracted HOWE and the PP fingers.

Add the air gap of .145" + the .375" of PP/clutch disengagement stroke for a total of .520" travel, the HOWE has an overall stroke of .549" before the O-ring will pop of the end of the TOB and begin to leak so you don't want to stoke past.549", Centerforce tech says the clutch needs .375" of travel to disengage but it appears to be less than this amount based on my tests,

BTW, the air gap is used to accommodate the clutch disc wear which will make the fingers extend towards the TOB as the disc wears.



Box of HOWE .045" thick spaces.


Here notice that I had to counter sink the one bolt head so the hyd-fittings would clear, also I installed an anti-rotation bolt (8mm-1.25) to limit the travel of the TOB and prevent the TOB from spinning


Pic of the BH on the tranny and the TOB on the input shaft as well,,,, this must be assembled to the block in this fashion because the TOB will not fit thru the hole in the BH.


Howe TOB
[IMG]http://static.summitracing.com/global/images/prod/norm/hre-82876_w_m.jpg[/IMG]
[url]http://store.summitracing.com/partdetail.asp?autofilter=1&part=HRE%2D82876&N=700+115&autoview=sku[/url]

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[IMG]http://static.summitracing.com/global/images/prod/large/mor-62595_w.jpg[/IMG]
[url]http://store.summitracing.com/partdetail.asp?autofilter=1&part=MOR%2D62595&N=700+400105+115&autoview=sku[/url]

Thanks for the pictures.

LD85,

I am almost ready to begin this clutch conversion on my 91. Can you please tell me what flywheel you are using and what is it's thickness? I already have a billet Centerforce flywheel, but it is 1.5" thick, and I think that this may be too thick. From your pictures, it looks like your flywheel is thinner. Any info is appreciated.

cost of conversion?

Like I said, I have not yet started. It looks like I will need a different flywheel. My Centerforce billet (stock replacement) is too thick (1.5"). From my research, it looks like a Hays 10-530 flywheel will work. I haven't verified the thickness of this unit yet, but it should be around 1.062". Cost is about $260 for the flywheel. The rest of the components would consist of Hays PP 33-610, $199, Hays disk 40-121, $99, and Howe 82876, $159. Total (less miscellaneous crap like hydraulic line) is $717. I will be re-using my stock master cylinder. The good thing about this setup, is that it frees me from a proprietary clutch design (like the stock GM, and Ram C4 conversion). I will be able to buy universal components from any source and know that I can just put them in myself without spending over $1000.

My application is a 434 stroker, Brodix heads, Comp 246/250 solid roller cam, custom single plane Edelbrock 2925 manifold EFI, TPIS long tube headers, and I do all of my own programming. The car even idles with air cond. on. Car made 490rwhp, and 456rwtq on chassis dyno. Best speed in 1/4 mile was 121mph. ET sucked due to excessive wheelspin. I then added slicks and smoked the clutch.

If anyone out there can verify the 1.062 flywheel thickness for this clutch conversion, then that would be helpful

hi guys,
i have brought for my 1991 vette a ram billet singlemass 153 tooth fly wheel # 1514 "0" balance and
# 401 ram preasure plate,#979 clutch disk to support 550 rwhp and special push style bearing # 78145 kit to suit.
i spoke to mike @ tech dept at rams clutches about this on
803,788,6034 ext # 204.
hope this helps
cheers
glen

Nice, thank you! Aloha

So you put the trans in place with the bellhousing attached? That seems difficult.

Just buy a Billet 4+3 flywheel,,Hayes or Centerforce.

mine is a 4+3 FW with a 400 crank counter balance.

Also, call Ram or Hayes and find out if there is a shorter Pressure Plate, this will reduce the amount of shim between the block and Bell housing,,

The guys at McLeod tell me that a thinner Pressure Plate exists than the RAM PP i bought, it might be the Borg n Beck version.