[Indian Uprising]

I have a set of JBP Street Strip 6x heads 9.5 to 1 on a 455 with trw forged pistons.

Is it possible to mill these heads down to obtain 12:1 and run race gas or is that too much material being removed?

I'm sure the manifold will need to be matched as well.

[70 lucerne lemans]

I thought you guys were too CHEAP to run race gas!!LOL

[Indian Uprising]

Originally Posted by 70 lucerne lemans

I thought you guys were to CHEAP to run race gas!!LOL

I'm just looking into it.... just cause I don't have enough money to buy 3 SETS of rear wheels doesn't mean I'm cheap... LOL

[steve25]

No, the deck surface will be way to thin. Its time for different pistons to get 12 to 1.

[70 lucerne lemans]

Originally Posted by Indian Uprising

I'm just looking into it.... just cause I don't have enough money to buy 3 SETS of rear wheels doesn't mean I'm cheap... LOL

Yeah 3 sets of used wheels that cost me about what one new set would!I'm the original cheapskate.

Seriously,I've seen some good deals on used Eheads lately.Another option is I have a set of 62's (72 cc)that would get your compression up that we could do a Jim Hand port job on and put in your valves and springs.

[Indian Uprising]

Originally Posted by 70 lucerne lemans

Yeah 3 sets of used wheels that cost me about what one new set would!I'm the original cheapskate.

Seriously,I've seen some good deals on used Eheads lately.Another option is I have a set of 62's (72 cc)that would get your compression up that we could do a Jim Hand port job on and put in your valves and springs.

Well you know how it is...for the cost to finish old heads ( 3 angle valve job and my valves may not be the right length), I could buy new heads. Buying new heads (e-heads) will correlate to new headers, prob a victor manifold w/ a dominator and a new cam as well.... all said and done $3000.

not to mention a new torque convertor.

I think I'd rather stick $3k to get another car.

You know, I guess I am cheap.

I was just trying to see what power I can get out of my existing parts without blowing a load of cash.

[70 lucerne lemans]

I think a bigger cam and some more tuning will get you low 11's.Something I think you really need to do is make a cold air intake,your hood is pretty close to the carb too.

[Indian Uprising]

Yea, my car could benefit from a 290B and a cowl hood.

[Brian Baker]

The quick answer is...NO.

I had a pair of 6X heads on a .030" overbored 455. They measured up at 98cc and with all other parameters considered, produced 9.06:1 CR. I had them cut .060" which brought the chambers down to 86cc, producing a 10.12:1 CR. The most CR I think you can safely get out of a 6X head on a 455 is going to be around 10.5:1 using flat-top pistons.

[screamingchief]

Originally Posted by Indian Uprising

I was just trying to see what power I can get out of my existing parts without blowing a load of cash.

I dunno,,,I always thought that was why nitrous became popular???

[440GP69]

i have same deal here, pistons,chambers,ex ports,valves all thermal coated, 260cnc 6x heads, i want to mill to 86-87cc for 10.00:1 area with my Ross 2vr FT's and i am at sea level basically, 92octane is what i can get, the cam i have is a hyd roller 236-244 at .050 289-305 advertised lift is .602in .607ex timing at .050 is ivo-10 ivc-44 evo-58 evc-6 with a 112lsa installed at 108, will this cam work with that high of scr? sorry to jack the thread but i have been meaning to ask for a while, is there a better hyd roller cam?

[Don 79 TA]

i saw a pair of 6x heads that were whacked 120
the person who was using them had no problems, but that was on a 400 at the time

i have heard of a few other people whacking 100 off them too
they are pretty thick heads

[J.C.you]

Originally Posted by Don 79 TA

i saw a pair of 6x heads that were whacked 120
the person who was using them had no problems, but that was on a 400 at the time

i have heard of a few other people whacking 100 off them too
they are pretty thick heads

i have cut .100 off on several different castings including the 6x4s. never a problem yet but that doesn't mean there could be a thin spot in a particular head. the valley pan will have to be trimmed if you cut an excessive amount off.

[goatasaurus rex]

just a little hi-jack. has anyone here milled a head .100 or more in a high compression and high rpm application?

[tikiklubracing]

Originally Posted by Brian Baker

The quick answer is...NO.

I had a pair of 6X heads on a .030" overbored 455. They measured up at 98cc and with all other parameters considered, produced 9.06:1 CR. I had them cut .060" which brought the chambers down to 86cc, producing a 10.12:1 CR. The most CR I think you can safely get out of a 6X head on a 455 is going to be around 10.5:1 using flat-top pistons.

I milled a set of 6x4's to 86, pop-up pistons on 412. It equaled 11.25-1. Then the intake had to be drastically milled, for the performer to be alighned with the threads.

[J.C.you]

Originally Posted by goatasaurus rex

just a little hi-jack. has anyone here milled a head .100 or more in a high compression and high rpm application?

yes, i assume you mean for cast iron? i have found that the closer you get the valve to the deck surface the better for unshrouding the intake. this also will apply to alum heads.

i did not mention in the other post, it is better to cut the intake side of the head when milling the deck, rather than cut the intake for alignment purposes.

[Wareagle]

When I had the 77 SE T/A - 455 6X it had 9.5-1 comp. according to the previous owner.
Pulled pretty strong and never skipped a beat on pump gas .
The T/A is being restored as we speak by the current owner.

[thepontiacman]

I have some 6X-4's milled to 81cc For Sale in the Perf. parts section of PY. They were milled by a shop in OH,(deck and intake). Just in case you are interested.

thepontiacman@yahoo.com

[goatasaurus rex]

j.c.

cast iron, yes. would you mind giving me a few details of the builds. you can pm me if you wish.

thanks,

bob