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
 
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.
 
I found a site to calculate volume. It works out to 3.375" plus .010" puts it right on 306".
 
"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 said:
"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.
Click to expand...
Pete great stuff ... what were the bore stroke combo's & what rods & other mods were required ?
 
KiWinUS said:
Pete great stuff ... what were the bore stroke combo's & what rods & other mods were required ?
Click to expand...

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