Darth_V8r

iTrader: (4)

Good move keeping it oversquare. I done undersquare motors in trucks but much prefer oversquare for most uses

fnbadaz06

I talked extensively with Anthony Forney and Erik Koenig at Horse Power Research, before pulling the trigger on my LS7 based 468 stroker.
For a max effort N/A motor, the Darton sleeves were more than capable of supporting my needs. I went forward with using my original usable LS7 block for this project, to take advantage of the bay to bay breathing abilities. I had the option of saving a few dollars and going with the 5.3 option, but nostalgia and using my original motor won out

Going out to 4.185 bore on a stock sleeved motor is usually not recommended, but many have successfully built motors using this exact setup. The Dart iron sleeve adds significant strength and limits bore distortion. HPR sells this 468 as a max effort N/A setup....no boost or spray, as the custom pistons required for this stroker crank setup expose the upper rings to the combustion process much greater.

HPR prides themselves in selling the appropriate hardware based on the customer's wants and needs........ no big expenditures or big ticket items that are not needed.
They'll sell you a LSXR block, but they'll also tell you if and when they think one is needed.

From what I've learned from experts I've talked too, head deck thickness is more important than the 6 bolt head configuration when talking about head gasket issues and lifting heads on moderately boosted engines.

rkupon1

iTrader: (3)

I know, im at the tail end of a 25k ls7 build. I did quite a bit of research on the RHS block b4 we ultimately decided to use it in my NA build. My builder isnt into specing junk n headaches. But the stigma surrounding RHS blocks is all but gone. I believe there were issues with thier early gen blocks, but i couldnt find much as of lately. I dunno how many were sold and used, vs. how many had issues, but i doubt its that bad honestly. Defly wooda went Dart for different reasons if i was boosted, same price for block, but defly has a few more features. I guess when you start out already owning the block in use, than it does save some doe.

I so hope this is true!!! Lol. Time will tell

Smokey B

Crower is one of the best with there steel* shaft mounted rockers.....will be using a Crower 1.9 ratio for ls7 heads


Stud mounted rockers can handle higher lifts if u know what to do....Tap for a larger stud and change trunnion for larger studs. Weld up guide plates *if needed. Used Comp cams adjustable stud mounted RR.
I'm at 730 lift on both sides with a stud ..Guy who showed and taught me has used over 800 lift. Works with ls3 and ls7 heads. And rocker stud guirdle. 1800 vs 700 and a little bit of thinking not straight OTB.

bortous

I prefer rockers made from hardened plastic.
Most durable material you can get.

Mirek Again

Thanks for that info man. Much appreciated and good to know.

Smokey B

It's no problem, sorry about the late response... I've looked and spec'ed All aftermarket ls head's. Got another casting I've found I can get as cast.....mast STR 8 ....

Mirek Again

Just saw this

Darth_V8r

iTrader: (4)

Finally!

62nalide

iTrader: (2)

Not bad, wonder what price point will that be starting at.

fnbadaz06

Too bad they don't show the entire test and numbers.
I have a complete, detailed, flow test result sheet from WCCH on my Brodix BR7 BS heads from .100 all the way thru .725

Mirek Again

What is the significance of the 45* valve job as it relates to reliability ?
Just curious, if anybody knows why this is good/preferred (?).

spanks13

iTrader: (5)

High lift flows tend to be better with a 50 or 55* angle, but tend to wear out much faster

Mirek Again

Thanks man !
Pretty boss 2.25 titanium valves too.

62nalide

iTrader: (2)

Personally I stopped looking into flow numbers for some debatable reasons. I noticed the use clay to gain some CFM again it's normal I'd say and also wonder what bore is the plate they are flowing it as well. If they flow that at a 4.125 I'd like to see what they flow on a 4.185 bore for the OP bore spacing. I'd like to see them on engine dynos tho. Looks pretty good so far.

Mirek Again

Here they are.....

spanks13

iTrader: (5)

Their bench reads incredibly high. Look like another solid choice in the market though.

Don't race flow benches.

fnbadaz06

Higher than an All Pro head too.........

spanks13

iTrader: (5)

Their stock ls7 data is on the extreme high end of anything I've ever seen. At least on the intake side. Exhaust numbers are reasonable.

The gains over stock are quite solid. Probably some of that is to do with the larger valve. Stalling at .740" definitely shows they aren't lying about it being a smaller runner.

Darth_V8r

iTrader: (4)

They used a 4.155 bore plate vs a 4.125. That may be why.