454 rotating assembly
Le Mans Master
Joined: Apr 1999
Posts: 6,134
Likes: 46
From: Raleigh North Carolina
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Fully forged, internally balanced bottom end, 489 CI with head gaskets, rings, bearings, .047 quench 9.93 to 1 compression. little to no clearancing required, will need balancing but will balance with no Mallory needed. Will easily run on pump fuel if you use the cam I linked earlier. Polish the chambers, it will reduce carbon buildup and future detonation issues. Under $2100
http://www.summitracing.com/parts/sc...make/chevrolet
http://www.summitracing.com/parts/sc...5716/overview/
http://www.summitracing.com/parts/ue...make/chevrolet
http://www.summitracing.com/parts/cg...make/chevrolet
http://www.summitracing.com/parts/cl...make/chevrolet
http://www.summitracing.com/parts/cl...make/chevrolet
http://www.summitracing.com/parts/sl...4030/overview/
You could call this guy and check on either milling the domes 6CC or changing pistons. Looks like a real good price forged, already balanced with damper. Tell him you have a manual flywheel. I Haven't Used Him!!! You would need a standard thickness .039 gasket (cheaper)with this as the piston compression height is .010 taller
http://www.ebay.com/itm/BBC-CHEVY-48...-/330963972554
http://www.summitracing.com/parts/sc...make/chevrolet
http://www.summitracing.com/parts/sc...5716/overview/
http://www.summitracing.com/parts/ue...make/chevrolet
http://www.summitracing.com/parts/cg...make/chevrolet
http://www.summitracing.com/parts/cl...make/chevrolet
http://www.summitracing.com/parts/cl...make/chevrolet
http://www.summitracing.com/parts/sl...4030/overview/
You could call this guy and check on either milling the domes 6CC or changing pistons. Looks like a real good price forged, already balanced with damper. Tell him you have a manual flywheel. I Haven't Used Him!!! You would need a standard thickness .039 gasket (cheaper)with this as the piston compression height is .010 taller
http://www.ebay.com/itm/BBC-CHEVY-48...-/330963972554
Last edited by 63mako; Feb 17, 2014 at 06:02 PM.
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
I'm with Mako, if you have to buy a crank, rods and pistons, no reason to NOT to a 4.25" crank. Scat 4340 crank and Scat 4340 rods will not need clearancing. You will want to balance the whole assembly though once you get the pistons.
**Also, plan on buying a moroso 20403 oil pan. The 4.25" crank will definitely have windage issues with the stock vette oil pan... Hell even with the 20403 pan, I can still only run about 5.75 qts of oil... Any more then that and it loses a ton of HP and some oil pressure.
Even with stock 781/049 oval ports, this thing will make 500-550 hp with even a mild cam. Some good ported ovals and a hyd roller is 600+hp. Best off is the torque it makes. You can run a 3.08 gear and it still hauls azz...
**Also, plan on buying a moroso 20403 oil pan. The 4.25" crank will definitely have windage issues with the stock vette oil pan... Hell even with the 20403 pan, I can still only run about 5.75 qts of oil... Any more then that and it loses a ton of HP and some oil pressure.
Even with stock 781/049 oval ports, this thing will make 500-550 hp with even a mild cam. Some good ported ovals and a hyd roller is 600+hp. Best off is the torque it makes. You can run a 3.08 gear and it still hauls azz...
Drifting
Joined: Aug 2004
Posts: 1,883
Likes: 124
From: Lubbock TX
Scat ProComp (Not the junk ProComp brand) rods are stroker clearanced, designed with material removed in the right spots for both cam and pan clearance - these are the rods listed in 63Mako's wish list. I'd consider one of their cranks as well, the one he listed is internal balance and should be exactly what you need. Might try Diamond or SRP pistons, they're both good quality and won't break the bank.
Stay away from the ProComp junk, you'll spend more in machine work than you can save.
Stay away from the ProComp junk, you'll spend more in machine work than you can save.
Last edited by L88Plus; Feb 18, 2014 at 08:03 AM.
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Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
If you are running a 4.25" stroke, you'll want to run about 5.5 to 5.7 qts of oil at the most..(with filter).... Running 6 qts in that pan will cost you 40hp+....and you will lose a little oil pressure... I tested this on the dyno--its the real deal..
We did not use the windage tray with that pan due to clearance issues.
I run 5.6 qts on a fresh oil change and check my oil religiously..(like every weekend and top off as needed)... If you're gonna road race it or do top end runs, I recommend adding an accusump oil accumulator for added safety.
We did not use the windage tray with that pan due to clearance issues.
I run 5.6 qts on a fresh oil change and check my oil religiously..(like every weekend and top off as needed)... If you're gonna road race it or do top end runs, I recommend adding an accusump oil accumulator for added safety.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
I ended up with the 489 option and "while I was at it" I got a set of Brodix RaceRite ovals with 119cc chambers (10:1 compression) and 270cc intake runners. They appear to match up very well with the stock L36 intake.
I will also get a set of Hedman 68096 headers (2''/3'').
The machine shop will finish up the bottom end this week.
So, now comes the question of which cam to use with the Brodix heads.
Would the Howards cam stiil be good with Brodix heads?
http://www.summitracing.com/dom/part...make/chevrolet
I was thinking about getting a Straub cam with the expensive Morel lifters, but given that I have the rev limiter set at 5500RPM would that be overkill?
Does anyone here have experiences with the cheap Howards roller kits on a big block?
/Karsten
I will also get a set of Hedman 68096 headers (2''/3'').
The machine shop will finish up the bottom end this week.
So, now comes the question of which cam to use with the Brodix heads.
Would the Howards cam stiil be good with Brodix heads?
http://www.summitracing.com/dom/part...make/chevrolet
I was thinking about getting a Straub cam with the expensive Morel lifters, but given that I have the rev limiter set at 5500RPM would that be overkill?
Does anyone here have experiences with the cheap Howards roller kits on a big block?
/Karsten
Last edited by 63mako; Aug 18, 2014 at 09:15 PM.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Thanks for answering.
Piston to deck distance is almost zero (+/-0.03mm or 0.001'') so with a .040 gasket the quench distance should be right.
The springs are 140lbs on the seat and 400lbs at .600. I bought the heads from D&F performance and he verified the lift (coil bind) and I think he verified the spring rates as well.
With a longer exhaust duration comes even worse idle quality, right?
I can't tell you how much I hate the ****** rumpeti thump sound of those crappy "thumpr" type camshafts. I don't want it to sound like the engine could come apart at any time.
Piston to deck distance is almost zero (+/-0.03mm or 0.001'') so with a .040 gasket the quench distance should be right.
The springs are 140lbs on the seat and 400lbs at .600. I bought the heads from D&F performance and he verified the lift (coil bind) and I think he verified the spring rates as well.
With a longer exhaust duration comes even worse idle quality, right?
I can't tell you how much I hate the ****** rumpeti thump sound of those crappy "thumpr" type camshafts. I don't want it to sound like the engine could come apart at any time.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
Thanks for answering.
Piston to deck distance is almost zero (+/-0.03mm or 0.001'') so with a .040 gasket the quench distance should be right.
The springs are 140lbs on the seat and 400lbs at .600. I bought the heads from D&F performance and he verified the lift (coil bind) and I think he verified the spring rates as well.
With a longer exhaust duration comes even worse idle quality, right?
I can't tell you how much I hate the ****** rumpeti thump sound of those crappy "thumpr" type camshafts. I don't want it to sound like the engine could come apart at any time.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
Howards tech says the 140/400 springs are good for the CL120325-10 kit
@bluedawg: I "need" no more than 500HP, so a combination that will give me 600HP and terrible idle would be "mission failed" in my book.
I know many of you guys want to squeeze everything out of it, but really what use do you have for +500HP in these cars? It will just rip everything apart.
I just want to be able to occasionally "educate" guys in their family saloon cars, who have been watching too much Top Gear and thinks that a modern daily driver is faster than yesteryear's sports cars
@bluedawg: I "need" no more than 500HP, so a combination that will give me 600HP and terrible idle would be "mission failed" in my book.
I know many of you guys want to squeeze everything out of it, but really what use do you have for +500HP in these cars? It will just rip everything apart.
I just want to be able to occasionally "educate" guys in their family saloon cars, who have been watching too much Top Gear and thinks that a modern daily driver is faster than yesteryear's sports cars
Last edited by bluedawg; Aug 19, 2014 at 12:03 PM.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Howards tech says the 140/400 springs are good for the CL120325-10 kit
@bluedawg: I "need" no more than 500HP, so a combination that will give me 600HP and terrible idle would be "mission failed" in my book.
I know many of you guys want to squeeze everything out of it, but really what use do you have for +500HP in these cars? It will just rip everything apart.
I just want to be able to occasionally "educate" guys in their family saloon cars, who have been watching too much Top Gear and thinks that a modern daily driver is faster than yesteryear's sports cars
@bluedawg: I "need" no more than 500HP, so a combination that will give me 600HP and terrible idle would be "mission failed" in my book.
I know many of you guys want to squeeze everything out of it, but really what use do you have for +500HP in these cars? It will just rip everything apart.
I just want to be able to occasionally "educate" guys in their family saloon cars, who have been watching too much Top Gear and thinks that a modern daily driver is faster than yesteryear's sports cars