lifter valley bolts

[jari]

What bolts/studs can i use in the four extra holes in the lifter valley? I have Pro 1 heads on an BB.Chev. alu.block
The heads are sold as 119cc chamber, Dart says 121cc and i measured 124 cc :confused: is this normal

Regards Jari
Norway
www.jb-racing.com

[Dart Vader]

Dart part number 64210240

The newly designed head with revised plug placement is actually large, but yields more power, and it is about 124cc.

[Awesome Bill]

Nothing but the dart part # will work properly so don't try to get cheap and just run a stud with a washer, that will cause the ears to possible be damaged or break. jtusno.

[jari]

Ok i was told not to use them under 14:1 comp but i`m ordering them anyway

Jari

[Awesome Bill]

Its not the compression factor as much as a total cylinder seal issue. Thats about a 4" gap with out a head bolt and if you can put a bolt in a weak spot, do it. They do work great. Put the studs in first before putting the heads on and use a bottoming tap and clean the trreads up. get your spacers, washers and nuts on first then put other fasteners in. Saves some hassle.

[jari]

Dart part number 64210240

The newly designed head with revised plug placement is actually large, but yields more power, and it is about 124cc.

I belive you, it made 853 Hp on a 509 cid :D:D
I think the dyno is a little off but we had to run 60 psi with 50lbs/hr injectors
(Holley Comander 950) to not go lean from 6500 rpm