Did Chrysler make any BB 906 porting templates? If so, anyone have access to them? Thanks

I have some xeroxed 1-1 on a sheet of paper. you can glue em to something stiff to use as templates. PM me your address & if I can find em I will send you a copy next week (pretty sure I know where they are at).

Dear Lord.
Wasn't that like, 1978?
Luckily, Mopar guys never throw anything away...somebody still has those little plastic cut-out templates laying around.

I still have two sets of the original plastic ones. Lol

I have some of the plastic ones 😁

Still got a set over my Dad's place, right next the Direction Connection Engine and Chassis manuals.

Here's a link to a PDF with some templates I came across awhile back. Figured I'd pass it along. -Trent

Mopar head porting templates

The only problem is....... They instruct you not to do what's required if you're really trying to see some nice gains.........which is rework the short turn.

I've lost count of the number of bowl blended, ported, big valve bowl blended, big valve ported 906/915 heads that I've had on the flow bench over the last 25 years that didnt break 240cfm......... All because the short turn was left untouched.

It's a double edged sword......... Don't rework the short turn......they don't flow much.
Rework the short turn incorrectly....... They don't flow much.

This is why for the novice or first time porter, the 346/902/452 head is a much better choice.
Ther basically is no short side radius to screw up.
Just blend away the sharp edge, along with the rest of the normal bowl blending..... And you have a decent head.

I could probably rough bowl blend a 346 head in less time than it would take to cut out the templates.

Come to think of if, I had someone send me some stage v heads with big valves that were done using the stage v specific templates...... Mid-240's iirc.

They're on the shelf, next to the .654 mushroom tappet cam.
You never know when you might need something like that, right (?)

"Tonight, on this episode of 'Hoarders':"

Fugget them old templates and go read these links to some original Tech Archives posts on porting factory iron heads.

http://www.moparts.org/Tech/Archive/bb/40.html

http://www.moparts.org/Tech/Archive/bb/42.html

http://www.moparts.org/Tech/Archive/bb/62.html

http://www.moparts.org/Tech/Archive/bb/55.html

This is like Goldy Locks.......

A - First set - fresh valve job, OE type valve, bowl blended, no short turn work

B - Second set - dyno time only, valve job, Manley valve, bowl blended, short turn work done not as well as It should be

C - Third set - fresh valve job, Ferrea valve, bowl blended, pinch smoothed over, short turn done juuuust right.

All with 2.08 valve:

Lift-------A-----B-----C
.100---62.4/ 69.0/ 68.4
.200--118.3/148.8/138.4
.300--172.1/203.7/204.9
.400--224.9/238.1/251.3
.450--223.0/226.8/263.4
.500--224.9/228.7/260.8
.550--230.5/224.9/257.0
.600--232.4/224.9/251.3

I suppose 500" with a 590/600 lift cam and 915s that makes 645 hp 620 tq is like the seven dworfs?

Who in the heck would mess with those lousy 906 heads. Oh that's right, we did and had to 28 years ago. LOL. Those good for nothing super stock springs too.

Couple more for ya.....

Real nice 906 "F" head(not all F heads are great, but the best untouched 906's I've tested have been F heads), never touched previously.....
A- as removed from engine, oem valve and valve job

B- same port as above, grind 3 angle seat, back cut OE valve, minor bowl blend, no work to short turn

Lift------A/B
.100---63.0/68.4
.200--122.0/142.0
.300--179.3/201.3
.400--216.2/230.7
.450--223.0/234.4
.500--226.8/233.7
.550--232.4/230.0
.600--238.1/224.4

C- 915 head, old style MP 2.14 valve with back cut, bowl blend, basically no short turn work, and someone did a little opening/smoothing at the pushrod pinch;

Lift------C
.100---71.0
.200--145.1
.300--195.6
.400--229.4
.450--238.1
.500--238.8
.550--238.1
.600--237.0

A 915 someone sent in for tweaking......

A- what looked like a half hearted attempt at a bowl blend, OE valve, so-so valve job, no back cut

B- same port, remachine valve seat, bowl cut, blend bowl and short turn, Manley valve with back cut

Lift-------A/B
.100---61.2/69.0
.200--128.1/142.0
.300--187.8/206.1
.400--224.9/249.4
.450--225.6/260.8
.500--228.6/266.4
.550--232.4/268.3
.600--234.6/268.3

I still have a set of templates in one of my tool boxes. Hell I still have a set of 906 heads that are ported on the shelf.

Last one.....

A- "Ported" 906 head, SI brand 2.14 valve, no back cut, valve job done with a radius for bottom angle. Pinch opened to 1.070, guide boss trimmed a bit, some short turn work.
Didn't look too bad, and actually didnt work that bad in the upper mid-lift compared to a lot of what I see of these things.

B- open bowl more, relieve chamber adjacent to valve, longer top angle on valve job, a little more work on the guide boss, lay back the short turn, back cut valve...... Same cylinder as above

Lift-------A/B
.100---70.4/71.6
.200--124.4/156.6
.300--180.5/217.1
.400--229.4/255.1
.450--241.9/257.7
.500--243.8/258.9
.550--248.3/259.7
.600--248.3/258.9
.650--234.3/258.9
.700--234.3/259.7

The newer heads???
902 head(1974):
A- OE valve with back cut, grind 3 angle seat, less than 10 minute blend

B- open bowl a little more, bullet nose guide boss, pinch to 1.025", Manley valve with back cut

Lift--------A/B
.100---67.2/ 70.4
.200--139.0/142.0
.300--202.5/205.4
.400--230.5/244.5
.450--237.0/249.4
.500--240.7/254.0
.550--243.8/257.0
.600--245.7/253.2

I haven't figured out if it's stubborn or cheep, maybe I just wanted to prove the old junk can work.

Baaaaaahahahaha, I did until about a year ago! Found them in a drawer. Hey, back in the 80's, they helped me get my 440 smogger motor duster into the 11's.

Just keep having fun. That's what it's all about. When the fun stops, quit.