RDF 2000 T/A

Yes I know there is a search button but most of what I've found has to do with stock displacement cars. I did find one link that brought this topic up though. I'll be running a 422 (close enough) 4.030 bore 4.125 stroke and want to run heads that obviously will give me the most power. I'm not worried about price here, just the performance differences. I've heard good about both. If the car does have a power adder in the future it would be nitrous so my ideal compression ratio I would think would be near 11:1 or so.

Thanks, again everyone

JP98SS

I have a set of 6.0L heads with 75 cc chambers. I know of sets that are as small as 65cc. The 6.0L heads have better mid lift #'s than the LS6 heads. For an all out solid roller high lift motor the LS6 heads might be able to overcome their shortcomings in midlift flow. For the majority of hyd cam street cars the 6.0L heads should perform better.

kewlbrz

Are you referring the the LQ4 Iron 6.0 heads, or the LQ9 Aluminum 6.0 heads?

RDF 2000 T/A

6.0 aluminum heads <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

ScottyG

This is a good topic.

I'm more interested in a truly street-worthy hyd setup rather than an all-out solid roller motor, but I'd still like to see the pros and cons for either head on both motor setups.

CHRISPY

You are going to be spraying the car eventually right?

I would go fully ported 6L heads with peak flow numbers in the .560-.580 range.

Then run a decent sized hyd cam (240/244 range and keep the lift matched to the heads (say in the .570 range)

That with double springs will live a long time on the street and the double springs with that lift will take a lot of nitrous abuse.

Also you wont have to pay out the *** for those Ls6 heads <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

I would think 485RWHP NA would be no problem with that combo and you could spray the bejesus out of it <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Be sure to get headstuds and good gaskets as well.
cheers,
Chris

Hardtop

iTrader: (3)

Hey RDF give me the keys when your finished for a couple of passes at MIR. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> Have you considered an iron block setup? Thats what I'm thinking about for next year. Since you say your going to spray the hell out of it I think iron block would be more reliable in the long run. Who cares about the extra weight, you can get most of it back with a K-member and a Hawker battery. Just my .02. Good luck.

Bruce

MicahOWNSS

My LQ9's are making 11.2:1 compression ratio on a stock bottom end. I think that's a 58cc chamber?

RDF 2000 T/A

Bruce, In the topic title I said heads for iron block engines. The Iron Block is being ordered today (while they are on sale) I don't even wanna mess with a re-sleeved block, I want this thing to last for a long time. I'll be on motor mostly but Might spray it a a few times.... Iron blocks are also alot cheaper <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Bruce we can have a Iron Block Club lol...

<small>[ October 01, 2002, 11:57 AM: Message edited by: RDF 2000 T/A ]</small>

1CAMWNDR

iTrader: (21)

Ya know, since you drive a T/A; you don't need to call that motor a "422 or close enough". THAT IS A 421 SUPER DUTY MAN!!!!!!!!! <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />
<img border="0" alt="[Firebird]" title="" src="graemlins/formula.gif" />

ls1290

iTrader: (20)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MicahOWNSS:
<strong>My LQ9's are making 11.2:1 compression ratio on a stock bottom end. I think that's a 58cc chamber?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">For 11.2 compression on stock bottom end, the chambers would be 59cc. <- <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> Did you have a lot of material welded in? To go from 69cc to 59cc needs a **** load of work done to the heads.