Hi TQ engine block
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Hi TQ engine block
I have been getting the itch to build another engine, #6 or #7 I don't remember how many I've built so far in the 406 CI format.
Are the GM Bow Tie blocks decent for Hi Torque, it looks like they only have 2-bolt mains ? Would adding 4-bolt mains help or would it be just as easy to buy a Dart Little M?
I am considering another build, an engine that would make a modest 500+ RWTQ and I wonder if the Bow Tie would handle it, you cant beat the price.
If you have dynoed your engine using a Bow Tie block with 500+ RWTQ I love to know that is has been done,,,
Right now I have a dyno proven 460-RWTQ in my 406 with a 238-242 hyd-roller cam.... and I doubt I can hit 500 RWTQ without definitely dropping my cam down to @ 230/236 or so...
The perfect scenario for me would be to buy a block and use all of my forged internals, Eagle 4340 H-beams, Eagle 4340 -400 mains crank and Wiseco forged pistons so I can minimize the cost.
Any thoughts or real world experience?
Larry
Indianapolis
Are the GM Bow Tie blocks decent for Hi Torque, it looks like they only have 2-bolt mains ? Would adding 4-bolt mains help or would it be just as easy to buy a Dart Little M?
I am considering another build, an engine that would make a modest 500+ RWTQ and I wonder if the Bow Tie would handle it, you cant beat the price.
If you have dynoed your engine using a Bow Tie block with 500+ RWTQ I love to know that is has been done,,,
Right now I have a dyno proven 460-RWTQ in my 406 with a 238-242 hyd-roller cam.... and I doubt I can hit 500 RWTQ without definitely dropping my cam down to @ 230/236 or so...
The perfect scenario for me would be to buy a block and use all of my forged internals, Eagle 4340 H-beams, Eagle 4340 -400 mains crank and Wiseco forged pistons so I can minimize the cost.
Any thoughts or real world experience?
Larry
Indianapolis
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
I guess there are not many people with Hi TQ engines, usually HP is the goal for most people, but I want to shift away from that
After doing more googling, I understand that the stroke will need to change and it looks like 421 is as big as the Bow Tie will take safely in terms of clearance,,
Oh well maybe winter will yield some nice special project surprises,
Pro
Joined: Mar 2000
Posts: 658
Likes: 7
From: Perth Amboy New Jersey
There were several people interested, but after a while I just decided that I didn't want to settle on the HP of a C5, and I would prefer to get a C6 if I was gonna do it.
I guess there are not many people with Hi TQ engines, usually HP is the goal for most people, but I want to shift away from that
After doing more googling, I understand that the stroke will need to change and it looks like 421 is as big as the Bow Tie will take safely in terms of clearance,,
Oh well maybe winter will yield some nice special project surprises,
I guess there are not many people with Hi TQ engines, usually HP is the goal for most people, but I want to shift away from that
After doing more googling, I understand that the stroke will need to change and it looks like 421 is as big as the Bow Tie will take safely in terms of clearance,,
Oh well maybe winter will yield some nice special project surprises,
Le Mans Master
Joined: Feb 2005
Posts: 5,146
Likes: 3
From: The Motor City
Pretty sure GM states the bow tie block is good to 950 hp and the tall deck can do up to 500 c.i. I like those blocks and they can be had with a one piece rear main. If I were going to do another small block I would be looking at doing a sb2 or the later 2.2 parts.
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Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Thanks guys, I think my best bet is to buy a short block, and unload my rotating assembly....
I am torn on going BBC, I have always wanted to do this,,, but the end goal is to have substantial RWTQ, 550+ or more, and still be tunable....
I agree on the SB2, my local machinist made the same suggestion.
OLDALASKAMAN, I apologize for my snide respsone, no offense
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
I think my plan will be to go for max cubes with minimal valve overlap, medium length runners 11:1 or less cr
Last edited by LD85; Jun 7, 2011 at 01:39 PM.
Safety Car
Joined: Apr 2001
Posts: 3,525
Likes: 2
From: Houston TX
You can install a 4" crank in the factory block with the right choice of parts. For that matter, you can install a 4.125" crank, but after doing both, I like the 4" combo better.
I have been running it for years. Significant TQ...
I have been running it for years. Significant TQ...