Head Gaskets

[snake321]

What head gaskets should I use on a gen IV, stock bore motor with brodix BB2 heads?? Also, are stock bore (4.25) head gaskets 4.37?

[IMPATIENT 1]

i run felpro 1017's on darts, protoplines, and bb2's. not the best for a high boost motor but they'll handle 450hp of nitrous and we've put 14lbs boost on em and never blew em.they're about 49 a piece.always stud the heads, sure makes a headgasket live a long life;)
you'll think the headgasket bore is too big layed up on the block, but lay it on the head and you'll see why you can't run a bore specific gasket! they won't seal the fire ring properly if you used a 4.250 bore gasket on bb2's.

[steelcomp]

The Fel Pro's have been the standard for many years and are fine for most apps, but for a really good seal, you can use the new MLS style gasket like the Cometic. They're a little more expensive, but do a far better job of sealing. Your gasket size will always be slightly larger than the bore. Even if perfectly round, the edge of the gasket needs to be away from the edge of the cyl, otherwise you'll risk having hot spots that may cause detonation, especially on the MLS style gasket where the edges of the layers are thin and exposed. Clean and properly machined surfaces are very important for good seal, as well as proper torque sequence and method.

[snake321]

you'll think the headgasket bore is too big layed up on the block, but lay it on the head and you'll see why you can't run a bore specific gasket! they won't seal the fire ring properly if you used a 4.250 bore gasket on bb2's
Because of the champhered edge on the top of the bore ,right?
I appreciate the info. I read all morning till I was blind but couldn't find what you said in writing.

[RICHARD TILL]

i`m presently looking at the Brodix book. it says; Head gaskets, 4.310-FEL-PRO 1027, COMETIC C5432 4.540- FEL-PRO 1017, COMETIC C5433 it lists the same gaskets for the BB-2 and the BB-2 PLUS. stock bore is not mentioned, so i do`nt know what that means. i`m been running a gen IV, 4.310 and BB-2 PLUS heads with FEL-PRO 1027 gaskets for three years now with no problems. i hope this helps.

[steelcomp]

you'll think the headgasket bore is too big layed up on the block, but lay it on the head and you'll see why you can't run a bore specific gasket! they won't seal the fire ring properly if you used a 4.250 bore gasket on bb2's
Because of the champhered edge on the top of the bore ,right?
I appreciate the info. I read all morning till I was blind but couldn't find what you said in writing.It's usually because of the distance across the chamber, from valve pocket to valve pocket. Those heads are designed for a 4.5 bore. and have very large valves, and a wide chamber. The fire ring on a 4.31 gasket will hang in the chamber at the valve pocket.

[IMPATIENT 1]

It's usually because of the distance across the chamber, from valve pocket to valve pocket. Those heads are designed for a 4.5 bore. and have very large valves, and a wide chamber. The fire ring on a 4.31 gasket will hang in the chamber at the valve pocket.
exactly what i meant!

[snake321]

i`m presently looking at the Brodix book. it says; Head gaskets, 4.310-FEL-PRO 1027, COMETIC C5432 4.540- FEL-PRO 1017, COMETIC C5433 it lists the same gaskets for the BB-2 and the BB-2 PLUS. stock bore is not mentioned, so i do`nt know what that means. i`m been running a gen IV, 4.310 and BB-2 PLUS heads with FEL-PRO 1027 gaskets for three years now with no problems. i hope this helps.
What bore do you have?

[IMPATIENT 1]

What bore do you have?
4.310 is a 60 over 454;)

[snake321]

So I gasket to the head - 4.310, reguardless of the bore.

[IMPATIENT 1]

So I gasket to the head - 4.310, reguardless of the bore.
you should be less concerned about block bore size than bore size on the head's combustion chamber, that's what your trying to seal off. it takes a bigger bore headgasket to seal off the head.if you've got your heads, take a look and see if it makes sense.

[RICHARD TILL]

Snake, i`ve been out of pocket for the last few days and hopefully you`ve got your answers by now. i`m running 4.310 bore with a 4.25 crank and 6.385 rods. thats 1/4 inch added to both the crank and rods. its a 496 c.i.d. the hull is a texas tunnel and i use it only to run the 10 second class. the motor turns 6500 rpm`s at w.o.t. its my understanding that the only difference in a fel-pro 1017 and a 1027 is the wire inside the gasket on the 1027 is softer not to make an imprint on an aluminum head. if anyone knows better, i stand corrected.

[IMPATIENT 1]

Snake, i`ve been out of pocket for the last few days and hopefully you`ve got your answers by now. i`m running 4.310 bore with a 4.25 crank and 6.385 rods. thats 1/4 inch added to both the crank and rods. its a 496 c.i.d. the hull is a texas tunnel and i use it only to run the 10 second class. the motor turns 6500 rpm`s at w.o.t. its my understanding that the only difference in a fel-pro 1017 and a 1027 is the wire inside the gasket on the 1027 is softer not to make an imprint on an aluminum head. if anyone knows better, i stand corrected.
they're both for alum heads but the 1017 is for 4.540 bore, the 1027 goes to a 4.370 bore. the 1027 won't seal up dart heads or brodix no matter what the cylinder bore is, the head combustion chamber bore on most alum heads is bigger than 4.370(1027 gasket).

[snake321]

I got the 1027's for the bb2's like brodix said. You're sayin they're gonna fail?

[IMPATIENT 1]

I got the 1027's for the bb2's like brodix said. You're sayin they're gonna fail?
can't remember exactly what the bb2 chamber looks like, but set the head gasket on the head and make sure the fire ring completely encircles the heads combustion chambers. if it does, use em.if it doesn't use 1017.
i ran into issues awhile back on dart heads and ever since, i've found that the 1017 seem to fit everything right, so i've been sticking with those.

[snake321]

http://img.villagephotos.com/p/2004-11/883775/10271.jpg
http://img.villagephotos.com/p/2004-11/883775/10272.jpg

[IMPATIENT 1]

looks good to me! i can't remember what we ran into that made us use the 1017's on my bud's bb2's.