bore size help!!!

[moparsons]

I have a 361 bored .030 over. I need to order head gaskets (probly going with cometic) so I need to know what bore size to go with. Any motorheads wanna help a guy out? I'm an engine novice.

 

[1967coronet440]

I have a 361 bored .030 over. I need to order head gaskets (probly going with cometic) so I need to know what bore size to go with. Any motorheads wanna help a guy out? I'm an engine novice.

If you're .030 over you'll be at 4.15"

 

[moparsons]

Thanks. That's what I was thinking. They don't have that listed. Maybe I'll email them.

 

[IQ52]

Hard work will kill a guy.

FYI

It takes about 15 seconds to find that on the internet.

 

[moparsons]

Hard work will kill a guy.

FYI

It takes about 15 seconds to find that on the internet.

This IS the internet smart ***. Thanks for the insight.

 

[WileE]

This IS the internet smart ***. Thanks for the insight.

Actually, He'll have the answers to any questions on your engine build, and some you never even thought of.

 

[moparsons]

Actually, He'll have the answers to any questions on your engine build, and some you never even thought of.

That's great...but he doesn't seem like the helpful type. At least not this time.

 

[moparsons]

Before this turns into something...I apologize. Maybe the smart *** comment was out of line.
I'm new around here and don't want to step on toes.
But I did try Google first...and after a couple pages of results...came up empty...so I decided to ask here. Had an answer that I trust quickly. I thought that was part of what this site is....helping each other out.....

 

[miller]

All the bores need to be looked at, and accurately measured first. Then, the size of the bore cut is decided.
No cutting...until you, and your friendly machine shop, have the oversize pistons your hands. Pistons need to be 'fitted' to each hole.

No internet needed. Just numbers.

 

[moparsons]

All the bores need to be looked at, and accurately measured first. Then, the size of the bore cut is decided.
No cutting...until you, and your friendly machine shop, have the oversize pistons your hands. Pistons need to be 'fitted' to each hole.

No internet needed. Just numbers.

Thanks. Good advice.
I'm not actually machining anything right now though...just ordering head gaskets (cometics are bore specific).
I'm taking the previous owners word that it's. 030 over...will obviously eyeball the gaskets vs. the cylinders.

 

[WileE]

Before this turns into something...I apologize. Maybe the smart *** comment was out of line.
I'm new around here and don't want to step on toes.
But I did try Google first...and after a couple pages of results...came up empty...so I decided to ask here. Had an answer that I trust quickly. I thought that was part of what this site is....helping each other out.....

Don't take everything/anything personal. There's a good knowledge base on this site. I may disagree with someone about whatever, but I'd be willing to help a fellow/gal Mopar fan anytime.

 

[moparsons]

 

[Garys1969RR]

This IS the internet smart ***. Thanks for the insight.

Hey, welcome to the forum moparsons! Don't get too bent out of shape with some of the comments. We all really do try to help each other here. My first suggestion would be to start with at least a 383 size motor, or even better, build a 400. The problem here is that the bore size of a 361, at just over 4", restricts airflow into the cylinder. The 4.434" bore size of the 400 greatly improves airflow, since the valves have way less shrouding. You then have better cylinder filling as well as less chance of a valve hitting the cyl wall with a high lift cam. It has happened before! Most guys here build 383s, 400s, 451s, 440s and 512s or bigger. There isn't much cost difference between building a 361 compared to a 440. The 361 may even cost a little more! Remember: Aint no replacement fer displacement! LOL. Good luck!

 

[moparsons]

Totally agree....If I was starting from scratch or purely after performance...I would definitely go 440.
But the 361 is original to the car and was a fresh rebuild. When I get these head gaskets sealed up...I'll be on the road.

 

[SublimeSixpack]

Good luck with your 361. Let us know how things turn out.

 

[moparsons]

Thanks! Will do!
I started a rest thread a while ago....haven't got much done for a while. Hopefully lots of updates from now through the spring.

 

[miller]

If you're .030 over you'll be at 4.15"

Besides deciding what CR (gasket thickness) you want, just go by the bore size offers the gasket companies have. You just don't want any overhang on the bore. .030 isn't that much, .015 per side...can even see if stock gasket hole size will work.

 

[moparsons]

Besides deciding what CR (gasket thickness) you want, just go by the bore size offers the gasket companies have. You just don't want any overhang on the bore. .030 isn't that much, .015 per side...can even see if stock gasket hole size will work.

Yea...Cometic recommends their 4.25 gaskets for my 4.15 bore. May just go with felpros again....gonna retorque
and change oil before I decide to tear it apart again.

 

[Garys1969RR]

You can prob go with just about any head gasket there. You just don't want the gasket to hang into the cyl bore. Cometics may be one of the best, but with a garden variety 361, I wouldn't waste money on anything fancy. Also, those gaskets require a very smooth deck surface to seal, as I understand. So you should resurface the block and heads before assembly to insure a good seal. The steel shim at .020" thick will get you some needed compression, seal well, and they are inexpensive. What heads are you using?

 

[khryslerkid]

I'm .040 over on my 440. Used Felpro 8519pt1 measured fine on head and cylinder clearance.