BBC Pro Maxx / Patriot Feedom Heads

[Daryl]

I'm starting this topic to review my patriot heads that I'll be getting in a few days. Hopefully it will help someone else with their decision on whether they should buy or not. I have been doing a lot research on these and there really isn't a whole lot of information on them. Most of it is hearsay in the chat rooms. I've found a few build articles from Car Craft, CHP and Supper Chevy and there they get a good review with very respectable power numbers. I decided to go with them because Chris Straub had given them thumbs up somewhere in my reading on the heads. I bought them bare from Jegs priced matched for 1014.00 delievered. Fed Ex tracking has them at my door on Wednesday. Pictures and comments to come.

[cny first gen 71]

I got the patriot heads for my small block and they sure are purdy, I havent installed them yet im going over some options and possably this winter. I did already find out I need new headers as the ones I have wont work with the angle plugs. I'll be putting up a post about that shortly. Good luck with yours.

[Daryl]

Sounds good! It will be great to hear how the SBC ones work out. I have a LT1 sitting in the corner itching to go into some thing. I was thinking of trying the patriots on that block too.

[Daryl]

This is some flow data I got from Eric Weingartner Racing LLC. They were out of the box as cast."Finally flowed some Patriot 320cc bbc heads here is what they flowed"

 

Long Short EX

.1 63 57 60

.2 140 127 103

.3 195 190 154

.4 252 250 189

.5 305 309 242

.6 343 326 256

.7 369 326 266

.8 363 343 266

.9 350 341 267

1.0 350 336 268

 

This is on a 4.310 bore and no exhaust pipe

[Mike 57]

What is your plan for valves, springs, retainers, guide plates and rocker studs? Do they list a recommended valve length? That would be a help.

 

What are they going on?

 

I like that they post flow numbers up to an inch! That would be an adventure.

 

Looking forward to some pictures.

[Daryl]

Valves I am going with are severe duty Manley’s. Patriot recommended valve lengths for the heads are +.250 on the Int and +.100 on the Exh over stock. I already have my springs and retainers. Crane electro polished springs and titanium retainers. Harland Sharp rockers on ARP studs. The heads will be sitting on a seasoned, studded 454 .030 over block, 4340 stroker crank and 6.385 forged rods. Pistons are forged Diamond 21.5cc domed. Rings and pistons are set up for nitrous but I don’t plan on it for now. Cam, solid roller .283 .290 dur and .642 .650 lift with PBM pressurized oil lifters. Melling HV oil pump, 8qt pan. Vic Jr. intake and a Carb Shop worked over Holley 850 that flows 920, if I remember correctly. Trans is a reworked 4l80e with a TCI controller. Not sure about the converter or final gears yet.

[Mike 57]

Sounds like a fun build.

[Daryl]

And here we go...

This was about the worst looking runner I found. Not bad at all! A few minutes with the grinder will take care of the parting line.

Intake Bowl

 

Exh Bowl

119cc Chamber

Seat blends look good!

Intake port match looking through intake

Milled mating surfaces look nice and smooth!

[Daryl]

The words Patriot or freedom is no longer on the head. Promax Performance is the only logo to be found.

Spring pocket

Need to add .4 for measuring ID with this style of caliper. Total of 1.7535

OD of the valve guide.

 

The valve guides are for 11/32 size valves.

 

 

 

 

[Daryl]

Other nice to know stuff;

Exh port raised .400

Heads are angled plugs

Spark plugs NGK R5671A7 4091

Head gasket Fel Pro 1017

Intake gasket Fel Pro 1275

 

If there are any specific questions I can answer for any one let me know. I can also take more pics if you want me too. It will be a week or 2 before I have all the stuff gathered up to put the heads together. At that time I'll post on the assembly and how it went.

[Daryl]

After doing some more reading, I came across a discussion about "threading" the valve guide to keep the valve seals in place. I looked at my heads and mine already have that done! By the way the valve guides take a .530 seal

[Daryl]

In the next couple of photos I'm showing the valve to seat fit. All I did was use some layout die and rotated the valve in the seat few times without any lapping compound. As you can tell from the photos they will need very little work to have them fitted properly.

 

Int Seat

Int Valve

 

 

Exh Seat

 

Exh Valve

 

[Daryl]

I finished lapping all the valves tonight. No issues and as stated, took a short time to get a nice fit.

[Daryl]

Do to hunting season, time with the family, Christmas, New Years and being busy at work, I didn't get the heads done till last week. First I had to end up buying a new set of EX valves that were stock length. The ones that were recommended to me ended up being too long. They were .100 over stock. With the longer valves there was too much shimming or keeper adjustment to do for my spring set up which had an install height of 1.950 Also the rocker arm geometry was off with the valves at the taller height. In the end with the stock length valves on the EX and .100 longer on the INT everything worked out. The following is what I ended up using;

 

Retainers

Del West super 7 titanium

Springs

Crane electro polished 96883

Intake

Valve- .100 over stock length

Locator- .040 thick

Exhausts

Valve-stock length

Locator- .060 thick

 

The cam I'm running has a lift of .650 on the Ex and .625 on the Int. Valve and seal clearence is good and there is plenty of room with this cam.

 

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