yeah mate your right . the heads are down the shop now ol mate down there is evening the chamber cc out . & yes I'm using muscle motors or eagle 490 cube crank & rods , gota go cya guys

 

my machinist called me today & said 86 cc average chamber . with zero deck height 4cc valve reliefs 4.290 bore x 4.250 stroke that's a close to 11:1 compression , but my pistons are about .100" down the bore & i will be using Indy ez closed chamber heads 75cc not to far down the track maybe 12 months or after i get back from Canada . it all so depends on how much bore clearance for the forgies . one bore has .004" clearance & 1 has .0045" clearance all the rest are even at .0025" . i wanted to hone to suit forged pistons but that depends . i must go i'll catch yas later

 

[quote=deadkelly;22081]my machinist called me today & said 86 cc average chamber . with zero deck height 4cc valve reliefs 4.290 bore x 4.250 stroke that's a close to 11:1 compression , but my pistons are about .100" down the bore & i will be using Indy ez closed chamber heads 75cc not to far down the track maybe 12 months or after i get back from Canada . it all so depends on how much bore clearance for the forgies . one bore has .004" clearance & 1 has .0045" clearance all the rest are even at .0025" . i wanted to hone to suit forged pistons but that depends . ok i spoke to him again , right now with flat tops with 4cc valve reliefs with stock deck height it'll be 9.2:1 & 10:1 with indy 75 cc chambers . i marked the gasket surface so ol mate will mill the heads to clean it up which ill bump up the compression abit . he recommending only 9.5:1 - 9.8 max with iron heads . & not really over 10.8:1 with indys . mmm my chev mates not gonna be happy . i'll leave it up to the shop dude .

 

well pistons i have to do a bit of homework on piston size & clearance to make the most of the bores i have ( Tim will back me up here ) I'm already at 4.2945 " which is .0045 clearance ( .040" over ) & mother mopar's thick book says .040" max recommended for 69 block . ol mate said a bit of extra clearance is OK if there's no tapper ( not good , cheaper than re sleeving ) least this way i'll get a few more years out of my block . by then the world will be over anyway hahaha . a little joke between friends .

 

hey hypo1 this is it .

 

least this way i'll get a few more years out of my block . by then the world will be over anyway hahaha . a little joke between friends .

hahaha

 

that looks like something i might own hehe

 

no yours is a 76

 

the machine shop guy called today , all finished but another $730 that's around $1500 i spent on my iron 906 heads no it's more than that . oh yeah lets flush more down the dunny . i have all so been in contact with muscle motors & there tight fit pistons are a recommended .004 clearance that works out perfict . its a extra $200 for custom .040 + pistons but ya get that . I'm just waiting on my tax check can't wait .

 

when you had aluminum heads deadkelly, what compression were you running?

 

WOW DK, it would have been nice of your machinest to at least give you a heads up that it was going to cost more then aluminum heads... I hope they work out the way you want...

 

i haven't used my Indy heads yet mate . Indy ez heads with 75 cc chambers with a std deck height with flat top pistons with 4 cc valve reliefs = 10:1 ( that's 383 b +040) .

 

mate my Chev mate is furious , he got some Chevy heads done by the same bloke for $1600 including race port job . i think this has something to do with me porting it my self & him wanting the same money . i know that i had to pay for set up twice & cleaning twice . because i got the the valve seats ruff cut before i ported em . to be honest i was expecting $1100 .

 

If you are happy with it then that's all that counts

 

i'll keep yous informed . if I'm in the 11's i'll be happy

 

Well then I hope you get that 11, and yes do let us know...

 

i was doing some research with aluminum heads, and i figured out that they allow you to run higher compression with the same octane
isnt the higher compression needed to get back thermol efficiency?

 

yeah as a general rule of thumb ya can go 1 full number higher in compression with the alloy heads . when i switch to the Indy's i'll have to do some more research because i want to thump in 200 hp of nitrous as well as a big roller cam .

 

i know that a lot has to be done to the motor to put nitrous on it
do you have to do something weird to the head gaskets?

 

yeah when i change heads i'll use thicker gaskets .

 

here's some finished pics

 

the springs were a lot heaver than we thought . there around 150 lbs / 350lbs there only singles with dampers . could they be the mopar battleship springs ? that's what may have bent the stock pushrod + over revving . i'm taking the block down on monday to get sonic tested .

 

Ya won't have to worry about valve float..
Heads look good man.

 

Lookin good DK, thanks for the pics...

 

i'll just wait for the report back from the sonic test before i order anything . mmmm it's slowly getting there . should be a real torque machine with good power as well but my exhaust will be holding it back .

 

yeah fenderwall headers 2 7/8 inch primaries into to 3 1/2 in exhaust . it will all be part of the Indy heads , roller cam & nitrous package .

 

Maybe you said before but what ET you looking for?