I've got the 468 pulled and already at the machine shop. It's gonna need 1 piston which HPR is sourcing to me.
Here's what the new build is gonna look like:
1) HPR 468 gen iv aluminum shortblock). 4.185 bore x 4.250 stroke. 13.5 compression.
2) Liberty LS3/LS7 hybrid heads with 2.185 Victory titanium valves, 1209x springs, heads were ported and flowed at 425cfm by Carl Quist competition engines.
3) TSP 1.72 roller rockers.
4) Cam motion .739/.739, 262/276, 114+4 hydraulic roller.
5) Johnson 2126 lifters.
6) 3/8, .135 wall pushrods
7) CID 4.5 intake.
8) Accufab 4500 throttle body.
9) 2" long tube headers.
10) 100 pound Fast injectors.
11) Magnafuel 4303 pump.
12) Mechman alternator.
13) E85.

Transmission and stall:
1) FTI 1.80 powerglide.
2) FTI 8" 6000 Stall.

Rear:
1) Ford 8.8.
2) Spool.
3) 4.10 ratio.
4) 31 spline race axles.
5) Ladder bars and anti roll bar.

 

A set back is just that....Keep moving Forward 👍

 

At what lift was the 425cfm flowed? What do they do at .700 lift?

 

They flowed 425cfm on a 4.125 bore @ .750 lift. The bore on my engine is 4.185.

 

Can I ask why the cam seems to small?? Seems like you would want 280/290 700 plus for that??

 

Looking at other 468 builds, Erik typically specs the cams in the 260/270 range and with 700+ lift. My goal is to have repeatable 9's without having to rev it to the moon. I think I will be fine with this set up, but If I don't get there, I will make changes.

 

Man thats gunna be a handful. ; )

 

So what was the reason you burnt up the piston?

 

Ferrea valve broke in my MMS heads.

 

Great build
I like builds with odd ball set of heads so to speak and not so common...

 

Thanks man, I think they will perform nicely.

 

I hate to say this But I'll bet 5 bucks your engine is gonna like the Ls3 heads more... Why some may ask? With a engine this size it isn't CFM it's the CSA needed with CFM...

It's gonna have tq Regardless not saying a Ls3 is better than a Ls7 just it's happiness, & it's ability to Rpm with some Tq loss.

 

Reason I Preach what I Preach...

Every Combination has a recommendation for MCSA for a given Size and rpm peak.

A 468 going to 7k has a recommendation of what size?

MCSA is 3.00 sq. That's the Minimum so it's waning 3.1+ CSA to get a avg Minimum of 3.0 MCSA.

About the size of a stock Ls3 port. 👍

Sorry from the Reverend.about the sermon. 🙏

 

No it's not. A stock LS3 port has a mcsa that's more like 2.75in2

 

Avg Measured after porting? 👍

 

Depends on who ports it, but that's not a stock port anymore is it? The engine doesn't really even care about average csa anyways, does it? It's the minimum csa that matters more.

 

Not worried about the as cast Exact numbers. Rather the amount of CSA/MCSA wanted for a 468 @ 7k. Being this large wants a larger port...also may have gotten the Factory stuff as cast wrong.

Dennis Wheat ..
👍

Example of a Larger port head

 

I hate to be a Nag...

I hate to bother either for the MCSA...may send a sticky note question.

 

Yeah, your numbers are off for an as cast factory rectangle port. This was posted months ago by a moderator...I save and bookmark good info too...



That ends up being about 2.72in2 in the throat. Usually with a 45 degree seat your throat diameter shouldn't be much more than 90% of your valve diameter, but If you hit 3.0in2, you're getting up over that 90% rule for a 2.165" valve.

The LS7 is just fundamentally a better head. Better shape, better valve location, more CSA..

 

True, just too darn fragile for its own good.