505 Stroker ring gap ?

[DonnieLawson]

Im finally putting my 505 RB together , Im using the 440Source 512 kit , which is 505 cubes @ .30 over .
My question is , what should I gap the rings at ?
The compression should be about 11-1 ,about 600 hp give or take. CNC'ed Stealth heads . this is 95% street driver/weekend cruiser.
Hopefully somewhere in the 10's in the 1/4 mile
440Source premium forged Platinum Series pistons , these are Keith Black pistons
Total Seal' CR Series" Moly rings .
I put the crank in earlier today , so far , so good

 

[1968FormulaS340]

Why so much compression on such a big street engine.

You could go with pump gas easy compression and let the cubes do the talking.

 

[SGBARRACUDA]

With no nitrous, bore size x .0045 for the top ring. bore size x .0055 for the second.

 

[Longgone]

I did a 440 stroker using Total Seal rings and it`s been a while but I`m fairly certain the top ring gap has to be quite large something like .005 per inch of bore and the second ring gap around .004 per inch of bore. If you`re in doubt, I would call Brandon at 440source or Total Seal before you do a lot of assembly.

 

[Blownfish]

I would call Brandon at 440source or Total Seal before you do a lot of assembly.

That is the smartest thing to do, each manufacturer has different specs for their product. Also make sure if you ever decide to use NOS because NOS requires a little bigger gap.

 

[ramcharger]

I'd call KB as they have a different way of calculating the ring gap than most other piston manufactures. The top ring is closer to the top than most other pistons and sees more heat.

As stated before, nitrous and blown applications will require more gap too.

 

[DonnieLawson]

I'm gonna try to call 440Source tomorrow , They should point me in the right direction for the clearances for my build .
I should be able to run 93 octane with this combo , or so I was told .....
Thanks guys ,
Donnie

 

[gearjammer340]

With the right camshaft pump gas should be no problem. We're at 11.2-1 in our 67 gt and it runs(races) on pump gas (440/performer rpms/hughes camshaft) It runs high 10s so one would think yours would be faster with more motor.Sounds like a fun motor.
Good luck,
Jr.