2013 Cobra Jet 427

Al Loyrat · 07-23-2012, 12:07 AM

Could this be a 4.125 X 4.00 SBF ?

BlueOval Ralph · 07-23-2012, 08:58 AM

Sounds right based on 351 W block

Quote:

Originally Posted by Al Loyrat

Could this be a 4.125 X 4.00 SBF ?

Tom P · 07-24-2012, 02:16 AM

Isn't that what the 428 Windsor is now?

kdanner · 07-24-2012, 04:05 AM

Yes, 4.125x4.000

Quote:

Originally Posted by Tom P

Isn't that what the 428 Windsor is now?

4.080X4.100 for the 428.

Ed Wright · 07-24-2012, 08:09 AM

Is it rated at 275 HP?

Dyno · 07-24-2012, 01:55 PM

425 HP, same as the COPO Camaro. Same bore and stroke, the Ford has a longer rod. Wish I had either. Dyno

ALMACK · 07-24-2012, 03:11 PM

I was comparing the 2010 352 @ 285 hp vs. the 2013 363 @ 330 hp for the SS/GT classes.

The 2010 has a bore/stroke of 4.060 x 3.400
The 2013 has a bore/stoke of 4.125 x 3.400.

Everything else looks the same.

Using the .070 allowed overbore rule, a 2013 looks like it could also run as a 2010.

BlueOval Ralph · 07-24-2012, 05:04 PM

Taking a 4.125 and a .060 over bore per the rule give you a 4.185 bore with a bore spacing of 4.380 this only leaves less than .200 between bores not a lot material for head gasket seal.

rawhide · 07-25-2012, 10:39 AM

Quote:

Originally Posted by Dyno

425 HP, same as the COPO Camaro. Same bore and stroke, the Ford has a longer rod. Wish I had either. Dyno

I wish I had a longer rod to.
rawhide

Al Loyrat · 07-25-2012, 09:47 PM

The 327 COPO has over a 2 to 1 rod ratio.

07-23-2012, 12:07 AM	#1
Al Loyrat Junior Member Join Date: Feb 2010 Posts: 39 Likes: 0 Liked 1 Time in 1 Post	2013 Cobra Jet 427 Could this be a 4.125 X 4.00 SBF ?

07-24-2012, 02:16 AM	#3
Tom P Senior Member Join Date: Mar 2002 Posts: 707 Likes: 30 Liked 239 Times in 94 Posts	Re: 2013 Cobra Jet 427 Isn't that what the 428 Windsor is now?

07-24-2012, 08:09 AM	#5
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: 2013 Cobra Jet 427 Is it rated at 275 HP? __________________ Ed Wright 4156 SS/JA

07-24-2012, 01:55 PM	#6
Dyno Senior Member Join Date: Dec 2002 Posts: 912 Likes: 1,123 Liked 676 Times in 201 Posts	Re: 2013 Cobra Jet 427 425 HP, same as the COPO Camaro. Same bore and stroke, the Ford has a longer rod. Wish I had either. Dyno

07-24-2012, 03:11 PM	#7
ALMACK VIP Member Join Date: Jan 2009 Location: Bardstown, KY Posts: 1,935 Likes: 129 Liked 369 Times in 127 Posts	Re: 2013 Cobra Jet 427 I was comparing the 2010 352 @ 285 hp vs. the 2013 363 @ 330 hp for the SS/GT classes. The 2010 has a bore/stroke of 4.060 x 3.400 The 2013 has a bore/stoke of 4.125 x 3.400. Everything else looks the same. Using the .070 allowed overbore rule, a 2013 looks like it could also run as a 2010. __________________ Alan Mackin Stock 3777/ SS 3377 P/SA & SS/PA Fox Thunderbird I/PS '95 Mustang GT

07-24-2012, 05:04 PM	#8
BlueOval Ralph Banned Join Date: Feb 2008 Posts: 852 Likes: 0 Liked 0 Times in 0 Posts	Re: 2013 Cobra Jet 427 Taking a 4.125 and a .060 over bore per the rule give you a 4.185 bore with a bore spacing of 4.380 this only leaves less than .200 between bores not a lot material for head gasket seal.

07-25-2012, 09:47 PM	#10
Al Loyrat Junior Member Join Date: Feb 2010 Posts: 39 Likes: 0 Liked 1 Time in 1 Post	Re: 2013 Cobra Jet 427 The 327 COPO has over a 2 to 1 rod ratio.