Decking heads/Higher compression...

[07stangcs]

Looking for a good contact to consult some ideas about decking my heads. Stroker is set up for 10.5:1 and wanna know how much I can sqeeze outta decking the heads. Pretty sure 11:1 wouldbe simple, just wanna see how much is possible. Tried to have a local shop in Houston do the port and head work last time but they just contracted through foxlake. Foxlake did an awesome job and had a great turn around time. Thinking of giving them a call an discussing this. Anyone with personal experience with the 3v heads please chime in

 

[white05gt]

If you do that, you will change the cam timing.

 

[JeremyH]

I know theres someone on here had their heads milled took off like .5 mm or something like that and got like 10.5:1. cant remmeber who it was but it was in one of the build threads in the tech section awhile back.

 

[US-1]

If you do that, you will change the cam timing.

Yeah...if you take a half inch off the heads. How much do you think the tensioners can make up? We've decked four valve heads .020" before and never run into a problem with cam timing.

 

[US-1]

Looking for a good contact to consult some ideas about decking my heads. Stroker is set up for 10.5:1 and wanna know how much I can sqeeze outta decking the heads. Pretty sure 11:1 wouldbe simple, just wanna see how much is possible. Tried to have a local shop in Houston do the port and head work last time but they just contracted through foxlake. Foxlake did an awesome job and had a great turn around time. Thinking of giving them a call an discussing this. Anyone with personal experience with the 3v heads please chime in

You might end up with 10.75:1 but 11:1 is really a stretch when you're talking about milling the heads. Might have to deck the block a little or go with a thinner head gasket.

 

[jtscuba02]

If you do that, you will change the cam timing.

The cam phasers and tensioners should keep the cam timing the same, shouldn't it?

 

[jtscuba02]

You might end up with 10.75:1 but 11:1 is really a stretch when you're talking about milling the heads. Might have to deck the block a little or go with a thinner head gasket.

I have a question about this subject. Is it better to (as far as quench height vs compression increase) to deck the heads or block?

 

[US-1]

I have a question about this subject. Is it better to (as far as quench height vs compression increase) to deck the heads or block?

Personally....I like to deck the block in order to get the deck height as close to zero as I can get. Then we just do a surface cut on the heads to get them flat.

I've also been known to use an offset pin bushing in the rods to push the piston a bit farther up (and sometimes out of) the bore. Maybe a little "Stock Eliminator" treatment on the crankshaft for a bit more length on the stroke too.

 

[jtscuba02]

Personally....I like to deck the block in order to get the deck height as close to zero as I can get. Then we just do a surface cut on the heads to get them flat.

I've also been known to use an offset pin bushing in the rods to push the piston a bit farther up (and sometimes out of) the bore. Maybe a little "Stock Eliminator" treatment on the crankshaft for a bit more length on the stroke too.

Is the treatment for the crank called something like offset ground? Also, so what would be an ideal quench height for these motors? I have been wondering about this for my next build and you just don't see it discussed very much.

 

[US-1]

Is the treatment for the crank called something like offset ground? Also, so what would be an ideal quench height for these motors? I have been wondering about this for my next build and you just don't see it discussed very much.

Yeah...slight offset ground. Not much. NHRA allows +/- .015" on the stroke so you can actually get away with anywhere from .010"-.013" on the crank.

Deck height would depend on the build. An N/A engine...I'd try to get the piston at zero or .005"-.010" out of the hole to build as much compression as you can.

 

[07stangcs]

Thanks for the info SD. Shooting for 11:1. Trying to sqeeze more outta this thing without upping the shot. I'm on a 150 through the plate and afraid to go higher on a "single nozzle" setup. Even tho it's a plate it's still single nozzle and another route would be plumbing the mani for direct port. Just seems like a hassle to go that route and higher compression would be more fun even off the spray. Have some thinking to do.

 

[dysan]

What about the steeda charge motion plates which are set-up with nitrous ports?

http://steeda.com/products/steeda_charge_motion_plates.php

 

[07stangcs]

That's the route I'm talking about but it's kinda a bitch to setup and changing jets is a PITA. Have the stock cams back in till I get my vac pump setup done. Almost got into a wreck rolling out in traffic. Don't wanna get rid of my current delete plates as I had them matched. Goal is low to mid 10's when I'm done. I'd like to be the fastest nitrous only S197 but it's gonna take some work for that to happen.

 

[dysan]

That's the route I'm talking about but it's kinda a bitch to setup and changing jets is a PITA. Have the stock cams back in till I get my vac pump setup done. Almost got into a wreck rolling out in traffic. Don't wanna get rid of my current delete plates as I had them matched. Goal is low to mid 10's when I'm done. I'd like to be the fastest nitrous only S197 but it's gonna take some work for that to happen.

All it takes is $$$.

Good luck whichever way you go.

 

[retfr8flyr]

Another option you could look at is the C&L intake manifold has bosses cast into it for N20 nozzles. These would be much easier to work with than the delete plates.


Earl

 

[07stangcs]

In the end I know direct port will end up happening but I'm enjoying the HSW plate for now. Slowly removing weight as I go but this is a daily driver complete with car seats in the back so not a whole lot I can take out. Within the year it will most likely become strip only and I can really tear it apart. Wonder how fast I can go b4 HRP boots me for no cage. Went 11.33 and never heard a word. Prolly 10.5 I would guess

 

[SlvrS197]

^^ im surprised. The little old lady there can be a bish..she will boot ya for running low elevens if shes in the mood. lol

 

[US-1]

What about the steeda charge motion plates which are set-up with nitrous ports?

http://steeda.com/products/steeda_charge_motion_plates.php

That's what I would do. I wouldn't jack with the heads or the block. Leave them alone and do this.

Another option you could look at is the C&L intake manifold has bosses cast into it for N20 nozzles. These would be much easier to work with than the delete plates.

Or do this one. I'd still do the plates though. Puts the nozzle closer to the valves.

^^ im surprised. The little old lady there can be a bish..she will boot ya for running low elevens if shes in the mood. lol

It's not her. She's only reacting because somebody is yelling at her over the radio. Usually some dipshit who told you in tech not to go quicker than "XX.XX" and is getting his ass chewed out because you just went quicker than your gear allows.

 

[SlvrS197]

^ True

 

[07stangcs]

Yea plumbing the mani looks fun and I'm sure I could get alot more power on the same shot. Prolly would do a dif intake tho. Think the stocker will hold a 200 shot if I do the delete plate route?