What's involved in 426 install?

[CaliHemi60]

What kind of numbers will you be getting out of this set up,i am very interested

[Power Ported Performance]

Originally Posted by xlr8r

interesting- how much are you losing 5.7 top end vs. 6.1? Thinking for forced induction situation, need to build the bottom end anyway.

Originally Posted by CaliHemi60

What kind of numbers will you be getting out of this set up,i am very interested

You loose a little compression. A 426 with 6.1 heads, 6.1 Cam, 6.1 Intake makes 565hp/600tq on an engine dyno. A 426 with 5.7 heads, 6.1 cam, and 5.7 intake makes 500hp/560tq on an engine dyno. That is with Indy heads and stock cams. If you put the right cam in there with the Stage 3 5.7 heads from us, you can make 560hp/560tq pretty easy.

[NYC_SRT8]

You can physically bolt a 5.7 head on a 6.1 block but you will have coolant leaks like its nobodies business. The 6.1 heads and block have a additional coolant port that the 5.7s doesn't have. I will try to find a pic of 6.1 and 5.7 heads gaskets to prove this.

If you want to build a 426 and have a 5.7 motor you will need the complete motor PERIOD! However, they do have 392's built off 5.7 motors that you can just bolt stock 5.7 heads on. I won't recommend that since they don't flow enough air to take advantage of the extra hp and the valve springs won't be able to handle the lift of a 392 cam.

[Power Ported Performance]

Originally Posted by NYC_SRT8

You can physically bolt a 5.7 head on a 6.1 block but you will have coolant leaks like its nobodies business. The 6.1 heads and block have a additional coolant port that the 5.7s doesn't have. I will try to find a pic of 6.1 and 5.7 heads gaskets to prove this.

If you want to build a 426 and have a 5.7 motor you will need the complete motor PERIOD! However, they do have 392's built off 5.7 motors that you can just bolt stock 5.7 heads on. I won't recommend that since they don't flow enough air to take advantage of the extra hp and the valve springs won't be able to handle the lift of a 392 cam.

This is completely false. We have 4 cars out there running 5.7 heads on a 6.1 block. Sharadon performance has a 5.7 head on a 6.1 block. You need to use 5.7 head gaskets on the swap and there will be no coolant leaks period. Also, Indy cylinder heads also sells a 426 with 5.7 heads on top as well.

[monstergarage]

dont mean to hijack but ppp if you already have the 6.1 hemi what all is involved in order to make it the 426? and a round about estimate would be nice also. Thanks

[Power Ported Performance]

Originally Posted by monstergarage

dont mean to hijack but ppp if you already have the 6.1 hemi what all is involved in order to make it the 426? and a round about estimate would be nice also. Thanks

Do you want a 426 shortblock, 426 longblock, or 426 crate engine?

The 426 shortblock is $4804 plus $200 for cometic head gaskets, $50 for lower engine gasket kit. Thats roughly $5100, plus about $2000 for install. With stock heads and cam, this will probably make 440rwhp.
INDY 426 SHORTBLOCK 10.3 COMPRESSION - 6.1-S7-426

The 426 longblock is $8999 and all you have to add is your intake manifold, timing cover, and all the front accessories. This can make approximately 475-500rwhp depending on your headers, converter, cai, tune, and such. Install is around $1600 or so.
426 LONGBLOCK - PPP-426-LB