421 Cu. In. ?
Teching In
Joined: Jan 2005
Posts: 38
Likes: 0
Are you guys running pump gas ?
I'm not trying to hijack the thread, but I would really appreciate your opinion on my thread.
I am trying to decide 4.030 - 4.060 both will be sonic tested
What intake to buy and what cam
I'm not trying to hijack the thread, but I would really appreciate your opinion on my thread.
I am trying to decide 4.030 - 4.060 both will be sonic tested
What intake to buy and what cam
Originally Posted by EarlsWS6
Are you guys running pump gas ?
I'm not trying to hijack the thread, but I would really appreciate your opinion on my thread.
I am trying to decide 4.030 - 4.060 both will be sonic tested
What intake to buy and what cam
I'm not trying to hijack the thread, but I would really appreciate your opinion on my thread.
I am trying to decide 4.030 - 4.060 both will be sonic tested
What intake to buy and what cam
Originally Posted by Tom the roofer
No. I am not running pump gas. I use Sunoco Supreme leaded fuel. 112 octane @ 110 motor octane.
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8 Second Club
Joined: Dec 2002
Posts: 557
Likes: 0
From: detroit, Mi
Originally Posted by ASRoff
How much clearencing of the block (con rod to block) do you have to do? my understanding is that you dont have to clearence anything to make a 402.
What are the best rods to use for the least clearance issues? Who all makes a 4.125 crank? Me personally would like to build one of these for my street car but I think I would play it safe with a 4.020 bore...
Also, would 12:1 compression be ok on 93 octane? If not what is the absolute highest you can safely run?
Also, would 12:1 compression be ok on 93 octane? If not what is the absolute highest you can safely run?
8 Second Club
Joined: Dec 2002
Posts: 557
Likes: 0
From: detroit, Mi
Originally Posted by SSblack98
What are the best rods to use for the least clearance issues? Who all makes a 4.125 crank? Me personally would like to build one of these for my street car but I think I would play it safe with a 4.020 bore...
Also, would 12:1 compression be ok on 93 octane? If not what is the absolute highest you can safely run?
Also, would 12:1 compression be ok on 93 octane? If not what is the absolute highest you can safely run?
Matt
On The Tree
Joined: Mar 2003
Posts: 105
Likes: 0
From: Here and there
Originally Posted by TOSTO RACING
Actually my motor is a 421 4.030 iron block w/ a 4.125 crank I didn't know how it would work with a big stroke when we built it ,but it has been awesome so far the motor itself is making 700 fwhp 585 rwhp. I shift it at 8000 rpm and it pulls past that. We made a dyno pull at 8200 and it had just started to fall off at 8200 rpm.
Originally Posted by matt346ls1
I would imagine with most steel rods you would be good. Eagle makes the Crank along with a few others. 12:1 on 93 octane would be a little high. Not to say you couldn't just most people stick in the 11.5 to 1 and lower. Also you can go 4.030 iron no problem. That is playing it safe.
Matt
Matt
I think I will probably just go with a 4.1 crank in an LS2 block bored .020 (416 CI) and slap some ET heads on it. Maybe get close to my goal of 550rwhp on pump gas. Or maybe the L92 block will come out soon...427... 
Last edited by SSblack98; Dec 1, 2005 at 10:48 AM.
