I'd like valve spring recommendations for my 390 build

[blykins]

Give us a yell before you drop anymore coin on parts.

The Comp Cams setup is extreme overkill. 

He said it was a Lunati, and Ross said it was a good choice.

He said he ordered Comp Cams *rocker arms* and *I* said that they were overkill....

[dmann]

I do have a new EFR6758 turbo in my garage right now which would be too small, but if I added a second one...

But probably not very reliable with a stock lower end.  The turbo is currently reserved for an old Volvo I have anyway.

Depending which pistons you have and which head gasket you pick, you could be under 8:1 compression. 

On the good side it'll run on any fuel you put in there

Or he can put a turbo on it and not worry about too-big ports on too-small engine. 

[My427stang]

So 8:1 will make it pretty mellow compared to something higher, but I will tell you, I resurrected a build gone bad for a local guy.

Same 390, same 8:1 compression, fresh build.  It's on the forum somewhere when I did it.  Edel heads, RPM intake, 800 Edel carb, and FPA headers and a 279 adv Thumpr cam in a little 67 F100

It was not fast, LOL, but it ran surprisingly well even with lreal ow compression and it was far overcammed and too much intake.  Even had a close ratio toploader in it until we swapped it for aan early TKO, similar to the TKO-500

I'd love to see you stroke that thing and make some compression and torque, but sometimes even a little one will surprise you.

I personally would return those rockers, listen to Brent, buy a set of aftermarket stands, cut them down and run stock hyd rockers.  It'll be bullet proof.  I am baffled on what it'll make for power, but the heads should let it hang in there, might want to consider an RPM intake to take advantage of them

[FElony]

Give us a yell before you drop anymore coin on parts.

The Comp Cams setup is extreme overkill. 

He said it was a Lunati, and Ross said it was a good choice.

He said he ordered Comp Cams *rocker arms* and *I* said that they were overkill....

Hey, don't you come back at me with actual facts like that when I'm on a posting roll!

[FElony]

I do have a new EFR6758 turbo in my garage right now which would be too small, but if I added a second one...

But probably not very reliable with a stock lower end.  The turbo is currently reserved for an old Volvo I have anyway.

I think the stock lower end is tougher than you might think.

[FElony]

... might want to consider an RPM intake to take advantage of them

Did I see someone match up TFS heads to a BBM Tunnel Wedge, or was I high at the time? Sorry to derail. It'll never ever happen again. Honest. I promise.

[dmann]

So an eagle 428 crank is only a little over $400?  Would I need the external balance flex plate with this crank https://www.summitracing.com/parts/esp-104283980?

Here's a link to the external balance flex plate: https://www.summitracing.com/parts/atp-z242.   Worth doing?

[blykins]

If you're willing to buy a crank and pistons, I'd wait and go whole hog on a long stroke crankshaft. 

I also wouldn't advise the use of an Eagle crankshaft in an FE. 

[dmann]

I was thinking of buying only the crank, flex plate, and bearings. I’d gain about 20 cubes and some compression (I calculated about 1.5 or so points).  My existing pistons look new...previous owner of the vehicle said it was very recently rebuilt.  I'll need to pull a piston out and check the bore for taper.

Scat crank instead of Eagle?

[blykins]

Are you for sure it's a 390? 

Another concern I would have would be piston/valve clearance with the larger 2.190" intake valves on those TFS heads.

[dmann]

Ok, I’ll do the stroker 445.  I’ll take it in to my local shop and get it prepped.  Recommendation on pistons and compression ratios?  This is my “fun” vehicle that sees towing duty.

[blykins]

I'd aim for around the 9.7-9.8:1 mark.  I have some towing application engines out there that do well with that compression ratio.  You'll need a piston with around 25-26cc dish to do that.  I have two pair of TFS heads in here right now and they both come in at a hair under 70cc.

Your cam will be a little on the small side for 50 more cubes but it should be ok if you have to keep it. 

[dmann]

Thanks Brent, I'll take that info to my machinist.  I ordered an FEpower timing cover in the thought that someday I might want a different cam without having to pull the cover.

Dan