The Ford Barn

40cpe · 06-29-2015, 03:55 PM

There is a thread on the HAMB about Vern Tardel building an AV8 with a 306 in flathead. What is the bore/stroke of a 306? What is the largest cube possible flathead with water jackets?

http://www.jalopyjournal.com/forum/t...973427/page-12

You will have to scroll down till you see the video.

KiWinUS · 06-29-2015, 04:02 PM

Gene I am guessing Verns engine is 3 3/8 bore x 4 1/4 stroke ? I have not read the article . I have 2 engines with this combo.
Cheers
Tony

V8COOPMAN · 06-29-2015, 04:08 PM

3-3/8 X 4-1/4 does work out to 304+ inches. DD

my4dv8 · 06-29-2015, 04:10 PM

So tony , tell us more please. How do they perform?
There is one out in nz , well that's what is signed on the door (306 or 304)but it doesn't seem to really haul at the nostalgia drags , kind of sounds flat . No pun intended.
Do these rev well . The low end torque should give a real kick.
We are planning a 3 5/16 by 4 1/4 stroke with a kiwi L 100 cam.

40cpe · 06-29-2015, 05:00 PM

I found a site to calculate volume. It works out to 3.375" plus .010" puts it right on 306".

Pete · 06-29-2015, 05:24 PM

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"What is the largest cube possible flathead with water jackets?"

I built one with 345 ci. It is possible to go slightly more.
I have built several in the 320 to 325 range.

KiWinUS · 06-29-2015, 05:30 PM

Quote:

Originally Posted by Pete

"What is the largest cube possible flathead with water jackets?"

I built one with 345 ci. It is possible to go slightly more.
I have built several in the 320 to 325 range.

Pete great stuff ... what were the bore stroke combo's & what rods & other mods were required ?

Pete · 06-29-2015, 06:01 PM

Quote:

Originally Posted by KiWinUS

Pete great stuff ... what were the bore stroke combo's & what rods & other mods were required ?

Bore was 3.405.
Stroke was 4.750.
New 21A rods, shotpeened, reconditioned and bored to length. Matched set so it took a very minimum to balance.
Lots of grinding in the block.
The engine was very hard on rings because of the short skirt pistons and lots of clearance.

This was one engine I was later very sorry I built.
Although it was a winner, the customer told me it was for the drags but he put it in a circle track roadster running under a 300 cubic inch rule. They caught it and took all his points and fined him but it really pissed me off.

Ol' Ron · 06-29-2015, 10:19 PM

Dick Kacalis runs a 345 ci in his dragster, engine has been running the 1/4 mile for the past 15 years.

flatheadrunners · 07-01-2015, 08:15 AM

Keith Tardel built the motor. It was are backup motor for our Bonneville car.

06-29-2015, 03:55 PM	#1
40cpe Senior Member Join Date: May 2010 Location: Star, MS Posts: 4,024	306 Cu In There is a thread on the HAMB about Vern Tardel building an AV8 with a 306 in flathead. What is the bore/stroke of a 306? What is the largest cube possible flathead with water jackets? http://www.jalopyjournal.com/forum/t...973427/page-12 You will have to scroll down till you see the video.

06-29-2015, 04:02 PM	#2
KiWinUS Senior Member Join Date: May 2010 Location: Charlotte NC KiWi-L100 available here Posts: 2,954	Re: 306 Cu In Gene I am guessing Verns engine is 3 3/8 bore x 4 1/4 stroke ? I have not read the article . I have 2 engines with this combo. Cheers Tony

06-29-2015, 04:08 PM	#3
V8COOPMAN Senior Member Join Date: May 2010 Location: East Shore of LAKE HOUSTON Posts: 11,106	Re: 306 Cu In 3-3/8 X 4-1/4 does work out to 304+ inches. DD __________________ *Click Links Below* __ ▼ *'35-'36 W/8BA & MECHANICAL FAN* *T5 W/TORQUE TUBE*

06-29-2015, 04:10 PM	#4
my4dv8 Senior Member Join Date: Aug 2010 Location: New Zealand Posts: 1,111	Re: 306 Cu In So tony , tell us more please. How do they perform? There is one out in nz , well that's what is signed on the door (306 or 304)but it doesn't seem to really haul at the nostalgia drags , kind of sounds flat . No pun intended. Do these rev well . The low end torque should give a real kick. We are planning a 3 5/16 by 4 1/4 stroke with a kiwi L 100 cam.

06-29-2015, 05:00 PM	#5
40cpe Senior Member Join Date: May 2010 Location: Star, MS Posts: 4,024	Re: 306 Cu In I found a site to calculate volume. It works out to 3.375" plus .010" puts it right on 306".

06-29-2015, 05:24 PM	#6
Pete Senior Member Join Date: May 2010 Location: Wa. Posts: 5,407	Re: 306 Cu In Sponsored Links (Register now to hide all advertisements) "What is the largest cube possible flathead with water jackets?" I built one with 345 ci. It is possible to go slightly more. I have built several in the 320 to 325 range.

06-29-2015, 10:19 PM	#9
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,855	Re: 306 Cu In Dick Kacalis runs a 345 ci in his dragster, engine has been running the 1/4 mile for the past 15 years.

07-01-2015, 08:15 AM	#10
flatheadrunners Junior Member Join Date: May 2010 Location: california Posts: 11	Re: 306 Cu In Keith Tardel built the motor. It was are backup motor for our Bonneville car.