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Best aftermarket 427 crate motor

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Old 10-10-2018, 05:51 PM
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Best aftermarket 427 crate motor

Hello gents
A close older retired friend has a tired non-numbers matching 350 in his 62 Corvette roadster.
He actually has the backing of the Director of the Bureau of Household Affairs to buy a 427 crate engine (Unfortunately this truly is NOT me)
The budget is $10,000 for a turn key pump gas carbureted Dyno tested engine.
Itís use would be 99% street, keeping the 3:08 rear end & close ratio 4 speed Muncie. It also presently has 1 3/4Ē headers with 2 1/2Ē bumper exit exhaust.
I have not heard all together positive things about crate 427ís from CNC or Blueprint Engines or even SUMMIT or Jegs for that matter.
My personal opinion is that it should be a Dart block with AFR 210 Eliminator heads and hydraulic roller cam approx in the 230 at .050Ē range with a the true 10 to 1 compression ratio & a mech sec QFT carb, keeping a Performer RPM air gap for hood clearance
Iím thinking for the rotating assembly...Scat crank, rods?, D cup reverse dome pistons to match the AFR chambers?
Any sage advice from you guys would be appreciated. Iím sure somethingís left out here, hope you get the idea.
Looks like Iím living vicariously through this guy!
Thanks
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Old 10-10-2018, 06:18 PM
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Re: Best aftermarket 427 crate motor

You cant go wrong with a GM performance parts crate motor - there are a bunch to pick from

https://www.gmperformancemotor.com/
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Old 10-10-2018, 06:38 PM
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Re: Best aftermarket 427 crate motor

Sorry, SMALL block 427.
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Old 10-10-2018, 06:55 PM
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Re: Best aftermarket 427 crate motor

Originally Posted by Mortorq View Post
Sorry, SMALL block 427.
why does it need to be a SB stroker ??
check this out....https://www.gmperformancemotor.com/parts/19355722.html
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Old 10-10-2018, 09:05 PM
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Re: Best aftermarket 427 crate motor

Great idea, that 383 would definitely surpass the aged but built 355, but it’s just not the cubes & horsepower he wants.
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Old 10-10-2018, 09:11 PM
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Re: Best aftermarket 427 crate motor

Originally Posted by Mortorq View Post
Great idea, that 383 would definitely surpass the aged but built 355, but itís just not the cubes & horsepower he wants.
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Old 10-10-2018, 09:39 PM
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Re: Best aftermarket 427 crate motor

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Old 10-10-2018, 10:48 PM
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Re: Best aftermarket 427 crate motor

Call this guy and find out who should build it:

https://hinksonautomotive-cncblocks.com

He does some really nice work and has a great reputation around the forums, etc. I've seen several of his builds and the dyno results.
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Old 10-10-2018, 11:01 PM
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Re: Best aftermarket 427 crate motor

QwikTrip,
Another excellent idea, but he wants to stay old school sbc.
GeneralDisorder,
Sounds very much like competent qualified builder out there, but the owner resides in the NW suburban Chicago area.
I have heard good things about Opel Engineering in the past.
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Old 10-11-2018, 07:04 AM
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Re: Best aftermarket 427 crate motor

Originally Posted by Mortorq View Post
QwikTrip,
Another excellent idea, but he wants to stay old school sbc.
GeneralDisorder,
Sounds very much like competent qualified builder out there, but the owner resides in the NW suburban Chicago area.
I have heard good things about Opel Engineering in the past.
he ships
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Old 10-15-2018, 01:26 PM
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Re: Best aftermarket 427 crate motor

Originally Posted by Mortorq View Post
Hello gents
A close older retired friend has a tired non-numbers matching 350 in his 62 Corvette roadster.
He actually has the backing of the Director of the Bureau of Household Affairs to buy a 427 crate engine (Unfortunately this truly is NOT me)
The budget is $10,000 for a turn key pump gas carbureted Dyno tested engine.
Itís use would be 99% street, keeping the 3:08 rear end & close ratio 4 speed Muncie. It also presently has 1 3/4Ē headers with 2 1/2Ē bumper exit exhaust.
I have not heard all together positive things about crate 427ís from CNC or Blueprint Engines or even SUMMIT or Jegs for that matter.
My personal opinion is that it should be a Dart block with AFR 210 Eliminator heads and hydraulic roller cam approx in the 230 at .050Ē range with a the true 10 to 1 compression ratio & a mech sec QFT carb, keeping a Performer RPM air gap for hood clearance
Iím thinking for the rotating assembly...Scat crank, rods?, D cup reverse dome pistons to match the AFR chambers?
Any sage advice from you guys would be appreciated. Iím sure somethingís left out here, hope you get the idea.
Looks like Iím living vicariously through this guy!
Thanks
The AFR 210 is really a small head for a 427, But if your looking for a torque monster that is the best choice. I am not a big fan of the 4.000 stroke in a standard cam tunnel block unless some one wants to spend the money on a set of Callies X-D rods. On the 427 I like to use a 3.875 stroke with a 4.185 bore that way the base circle does not get to small. I used a HYD roller with a reduced base circle of 1.050 and I used the GM spider and GM roller lifter, To small of base circle the lifters will go below the dog bone.

Here is a copy and paste on the last 427 I built a few months ago.
Originally Posted by CNC BLOCKS View Post
Spent some time on the dyno yesterday on a SBC 427 build for a good friend of mine. He wanted a SBC with BBC torque down low for his street build. This engine laid out some impressive numbers.

Was a very efficient engine only required 32 degrees of timing it did not like 34 degrees and it did not like 30 degrees.

This is what I came out with and it was no budget build LOL.

This is also on my F/B page with a lot of pics of the build https://www.facebook.com/cncblocks.n...85?pnref=story

This will be the only one of these I will build I can take it off my bucket list as I have wanted to this build for a long time and it came out as planned.

Dart SHP block 3.875 stroke X 4.185 bore sonic tested 3 blocks and this one was the best one
.
Callies Comstar crank

Scat I beam rods 6.0

Custom Wiseco dished pistons.

Ultradyne HYD roller on a GM step nose core I used the GM spider and GM roller lifters reduced the base circle to 1.050 Lifters were quiet block need no oiling modification LOL

AFR 210 heads 75 CC chambers

Eddy Air Gap intake

750 Quick fuel carb, Wanted to go to a bigger High speed air bleed but the customer said leave it alone it was fine.

Scorpion 1.5 rockers

Champ 8 quart pan

10552 Oil pump





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Old 10-15-2018, 02:31 PM
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Re: Best aftermarket 427 crate motor

Keep the bore abit smaller and do a 415-421. Basically same thing lol get alittle more life out of it
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Old 10-15-2018, 05:47 PM
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Re: Best aftermarket 427 crate motor

Originally Posted by Mortorq View Post
My personal opinion is that it should be a Dart block
Originally Posted by HINKSON AUTO View Post
... On the 427 I like to use a 3.875 stroke with a 4.185 bore .
Looks like you found an answer...
http://dartheads.com/dart-product/shp-sbc-iron/


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Old 10-15-2018, 07:11 PM
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Re: Best aftermarket 427 crate motor


Last edited by NoEmissions84TA; 10-15-2018 at 07:17 PM.
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Old 10-16-2018, 12:27 PM
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Re: Best aftermarket 427 crate motor

Thank you all above for the info.
To steer clear of small base circle cam requirements/lifter pressure angle issues of a 427 sbc, the owner will most likely now be simplifying things with a Dart SHP 400” short block with their cast crank, I beam rods etc. Existing RPM air gap & 750 vac sec QFT carb.
AFR #1038 195’s & a David Vizard spec’d Lunati # DV278-06RH hyd roller cam. LSA-ICL 106*/104* 227*/227* .545”/.545”.
Or, a locally built SHP-based OPEL Engineering 400” short block.


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Old 10-16-2018, 12:43 PM
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Re: Best aftermarket 427 crate motor

Dont put a cast crank in a dart block lol if you spend the money put a decent crank in. They aren’t much more
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Old 10-16-2018, 02:19 PM
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Re: Best aftermarket 427 crate motor

Orr89RocZ
Agreed, but they come that way from Dart as the entry level 400” short block, with the forged crank etc as an option.
Do you think a hopefully, 400hp 5500 rpm combination with a 4 Spd & 3:08 rear end in an old C1 would absolutely require such a bulletproof upgrade?
It probably would be a wise move, even if it never sees a track.
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Old 10-16-2018, 05:04 PM
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Re: Best aftermarket 427 crate motor

If 400 HP is all you seek, just put a 350 roller in it. Save the rest of the money for a nice fuel injection setup.

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Old 10-17-2018, 08:16 AM
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Re: Best aftermarket 427 crate motor

GeneralDisorder,
The owner doesn’t really text, so a even self learning EFI might be a bit too much.
He’d rather stay old school with his 750 vac sec QFT & Performer RPM air gap & discontinued Mallory ign.
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Old 10-17-2018, 08:29 AM
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Re: Best aftermarket 427 crate motor

Originally Posted by Mortorq View Post
Orr89RocZ
Agreed, but they come that way from Dart as the entry level 400Ē short block, with the forged crank etc as an option.
Do you think a hopefully, 400hp 5500 rpm combination with a 4 Spd & 3:08 rear end in an old C1 would absolutely require such a bulletproof upgrade?
It probably would be a wise move, even if it never sees a track.
imo yes due to generally better quality cranks. Some aftermarket cast cranks are terrible. Some seem to work fine
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Old 10-17-2018, 08:57 AM
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Re: Best aftermarket 427 crate motor

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You mean, Scat good, Eagle not so much?
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Old 10-17-2018, 09:20 AM
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Re: Best aftermarket 427 crate motor

They are all coming out of China (the blanks anyway) these days. From what my machinist tells me - it's the final machining that's usually a problem. If it all gets checked out and "adjusted" if it's not perfect they are fine. There's plenty of people making high power on both. I have a customer with a 700 HP 2.0 liter engine running an Eagle crank. Forged of course.
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Old 10-17-2018, 10:31 AM
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Re: Best aftermarket 427 crate motor

Originally Posted by Mortorq View Post
Orr89Rocz
You mean, Scat good, Eagle not so much?
scat 9000 series do seem to be favored over eagle
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Old 10-17-2018, 11:07 AM
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Re: Best aftermarket 427 crate motor

Originally Posted by Orr89RocZ View Post

scat 9000 series do seem to be favored over eagle
My machinist says he sees fewer problems with the final machine work on the Scat products. So I would agree with that.

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Old 10-17-2018, 10:00 PM
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Re: Best aftermarket 427 crate motor

There are USA made crankshafts. I would chose one of those those over the best Scat products. Correct me if I'm wrong but Scat seems to be at the best of the budget end. Add even 50% to the crank cost and amortize that over the cost of the build and it doesn't add up to much.
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Old 10-17-2018, 10:10 PM
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Re: Best aftermarket 427 crate motor

MorTorqe

try this
http://www.nyesautomotive.net/427_550_HP.html


I might be ordering their 406 sbc with EFi next year. would upgrade the crank/rods to Callies and go with the 2000 rod bolt upgrade also.
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