701 Girdle Head I.D. and help

[ags0702]

I picked up this girdle head for pretty cheap, it seems in good shape but needs some parts. Anyone know who made this? Also, I need some help visualizing how this bolts on with the hardware...Is there a girdled head for dummies thread?

 

[stanton]

i think your missing some hardware

 

[ags0702]

i think your missing some hardware

Oh i know I am...just would like to know what

 

[#ZERO]

It looks like an old Riva head with none removable 31cc domes and you'll need the older style girdled head kit which is no longer available.

That aluminum bracket and hardware looks custom made and should hit the scrap pile IMO.

 

[Drav]

Defineately a older Riva head. Dunno whats up with the aluminum half girdle though?

You can run any girdle hardware with the head though, the head itself is the same as the newer ones that I have, so you can run ADA, Riva, whatever else for the girdle hardware.

 

[ags0702]

Thanks for the insight. If these are the 31cc domes, what compression do those yield?

Also where can I find some new o-rings? :shrug:

 

[#ZERO]

You'll probably have around 215 lbs compression with the stock 81mm bore 61x cylinder and higher if it's has been overbored.

McMaster-Carr has the o-rings and cord.

Riva 701/760 Head O-rings:

-Combustion Chamber, viton, -153, pack of 2: 9464K114
-Cord stock for shell seal, buna: 9407K21
-Spark Plug, buna, -118, pack of 100: 9452K82
-2nd from top, buna, -031, pack of 100: 9452K118
-3rd from top, buna, -043, pack of 50: 9452K132

 

[ags0702]

thanks for the quick reply. I might just throw it on to see what the compression comes to. I have some porting done so it may be a little lower. Where does sealant need to be applied between the head and cylinder?

 

[SuperJETT]

You don't need any sealant, the o-rings do it for you. You might need to grease them a little so they stay in the grooves during assembly.

 

[Drav]

Yeah no sealant needed. Just use vaseline on the dome orings to keep them in place as SuperJett said

 

[ags0702]

I'll get some new o rings from Mcmaster-carr next week. On the site you have to buy them and don't know what the shipping charge is....lame!

 

[#ZERO]

McMaster is pretty cheap on shipping a delivery is super fast.

 

[gorilla]

those domes look like they have been machined down inside the squish area quite a bit.

may be a 5mm strocker style riva head ???

good luck

gorilla

 

[SuperJETT]

I just looked, my last order with mcmaster in July cost $5 to ship, and it was quite a bit of stuff.

 

[#ZERO]

I believe gorilla is right by saying the head has been machined because the squish gap appears to be deeper than normal.

Try to measure the depth at the edge of the dome and let us know how deep it is.

 

[Drav]

Oh I just noticed you're the one who bought that head from seatsr4toilets. Yeah that head is for a stroker thats why the squish is like that....I dont know how that would run on a non stroker....the squish would be wayyyyyyyy off and compression would be super low.

 

[ags0702]

Would it drop the compression that much? With 31cc domes arn't you looking at 215psi w/o stroker. Can you give me an idea, in general of how more and less squish effects the motor? thanks

 

[Drav]

Well you're looking at a 5mm+ cut in the domes, thats pretty fawking huge haha...compression would be super low. and your pistons wouldnt even hit the squishband, I really dont know how that would run, I wouldnt want to find out.

The simple solution? Find out what stroke that head is cut for and get the stroker crank to accomidate....more power! =)

 

[ags0702]

Could anyone use this head? Anyone got a stroker? I'll sell it for what I payed for it.

 

[#ZERO]

I might be interested if the price is right.