[Dragncar]

Guys, how big a dish do I need for a 55c E head and want to get down to 11-1 CR for CA piss gas. For 4.25 stroke and/or 4" stroke.
And can I use a 6.875 rod,.990 pin.
Not sure if it would work with a 4.25 arm but I would like to run one.
Thanks for any help.

[tom s]

I think you are pushing it at 11-1 with the crap gas we have on a true street driving car.I think with Eheads Dave says 10.25 and with KREs 10.5.Good luck with your build.Tom

[mike leech]

Personally I believe this thread is a good way to end up on the wrong track. I can't be more clear that the BEST thing you can do is get tlwith scotty brown and with him and only him (and maybe one other guy familiar with your new heads )with your goals. You will be HAPPY WITH THE RESULTS.

Asking everyone for opinions will take you away from where you want to go.

[pastry_chef]

Bore?

If I assume 4.180 bore.
Depending on a few other things like head gasket, zero deck etc.
4.25 stroke would want around 31cc piston dish for 11:1

4.00 stroke a 25.6 cc dish

[Tom McQueen]

Probably one of the best compression ratio calculators on the web.


http://www.diamondracing.net/tools/

[Dragncar]

Mike, Scott's doing the pistons, maybe cam. need to txt you for his number. I lost it.
All I am asking for is dish ccs, can it work with my rods. Whatever stroke works. If the rods wont work sell them to help pay for this junk. nice junk though.
Tom, this is CA pump gas track only, open header, trans brake, big stall and a car that can take it.
heads are bad ass. Bore is 4.35.

[tom s]

At least at the track you can spike with some good gas?As you know the tune is everything when its on the edge.I wish we could get 93 in this POS state.Tom

[tom s]

Also a good candidate for a short rod build!Less detonation prone!Tom

[BADDTA]

Originally Posted by mike leech

Personally I believe this thread is a good way to end up on the wrong track. I can't be more clear that the BEST thing you can do is get tlwith scotty brown and with him and only him (and maybe one other guy familiar with your new heads )with your goals. You will be HAPPY WITH THE RESULTS.

Asking everyone for opinions will take you away from where you want to go.

Exactley what we did. Worked out great!!

Brian

[slowbird]

I don't think you guys are giving the internet collective enough credit

[Dragncar]

All I want to know is can I use my 6.875 Crower billets. And what stroke.
Less prone to detonation with shorter rods. That just means you make less cylinder pressure. And cylinder making pressure is what hot rodding is all about.
At 11-1 with 91 octane I can just start out mixing gas, then back off the race gas. And if it runs the same (or better) when I get down to straight pump gas then there is no detonation.
I have a guy that wants to buy them .Might just sell them and get whatever length rod needed later.

[slowbird]

Why couldn't you use those rods?

[BADDTA]

Originally Posted by Dragncar

All I want to know is can I use my 6.875 Crower billets. And what stroke.
Less prone to detonation with shorter rods. That just means you make less cylinder pressure. And cylinder making pressure is what hot rodding is all about.
At 11-1 with 91 octane I can just start out mixing gas, then back off the race gas. And if it runs the same (or better) when I get down to straight pump gas then there is no detonation.
I have a guy that wants to buy them .Might just sell them and get whatever length rod needed later.

On my sons car. We run 11.33:1. He runs pump gas all over. 2 hrs one way at times. Has 6.8 rods and 4.00" stroke. 1.43 comp height. 6 cc valve reliefs in flat tops and 69 cc chambers in E heads. Just some general calculating you'll need 20 cc dish in your pistons. Obviously lots of variables but it gets u in the ball park. He has also shifted this combo at 7600 at times but mostly at 72-7300. Zero problems with detonation. It's really a true street car.

Brian

[Dragncar]

I would like to use them but I am going to need a serious dish to get the CR down. Can I do it with a 4", I am sure I can. But really want to go with a 4.25 or 4.5 arm.
I know Dan used to go with a 7.125 rod on 400s, but had to use a .927 pin to make it work.
And thats with a 3.75 stroke.
You run out of room at some point.

[BADDTA]

I just noticed u have a 4.35 bore. Use a .080 head gasket with the 20 cc dish. Just doing some quick math. Gives u about 11.18:1. 1.35 comp height. This is with a 4.00" stroke

Brian

[Dragncar]

Thanks BADDTA. You know, I do have a new set of Ross 4.35 bore pistons. 1.305 CH, 20cc dish, file fit 1/16 rings, tool steel pins and locks.
I understand there is 25HP in pistons with the trick metric rings. So thinking about selling the Ross pistons and getting custom ones from Scott B. (can you PM me his cell number, I lost it)
What kind of pump gas do you get in your neighborhood ? We get 91 here.
I will be shifting in the 8K range. Would like to run the longest stroke I can to let the heads do their thing. Got to flow over 400cfm (not that it means much)
Finally going to have some top end pull !!!. Sick of seeing cars run away from me after the 1/8th mile.

[mike leech]

With a 4" stroke its easy and use your rod. 4.25 stoke still easy and use your rods. Combo of dish and leaving it in the hole.

[mike leech]

And cam timing plays a role in the equation as well.

[BADDTA]

Originally Posted by mike leech

And cam timing plays a role in the equation as well.

Good point. That's where Scott will really work his magic for u Dragncar.
We have 91 pump gas.

Brian

[Tiger Paw]

Math to figure what fits and comp ratio, then select cam.