Best aftermarket 427 crate motor
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Joined: Dec 2006
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From: Hoffman Estates Il
Car: '88 IROC T5 Vert ‘13 Vette
Engine: 305 TBI
Transmission: T5
Axle/Gears: 3:08
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.
It’s use would be 99% street, keeping the 3:08 rear end & close ratio 4 speed Muncie. It also presently has 1 3/4” headers with 2 1/2” bumper exit exhaust.
I have not heard all together positive things about crate 427’s 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 .050” range with a the true 10 to 1 compression ratio & a mech sec QFT carb, keeping a Performer RPM air gap for hood clearance
I’m 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. I’m sure something’s left out here, hope you get the idea.
Looks like I’m living vicariously through this guy!
Thanks
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.
It’s use would be 99% street, keeping the 3:08 rear end & close ratio 4 speed Muncie. It also presently has 1 3/4” headers with 2 1/2” bumper exit exhaust.
I have not heard all together positive things about crate 427’s 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 .050” range with a the true 10 to 1 compression ratio & a mech sec QFT carb, keeping a Performer RPM air gap for hood clearance
I’m 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. I’m sure something’s left out here, hope you get the idea.
Looks like I’m living vicariously through this guy!
Thanks
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/
https://www.gmperformancemotor.com/
Re: Best aftermarket 427 crate motor
why does it need to be a SB stroker ??
check this out....https://www.gmperformancemotor.com/parts/19355722.html
check this out....https://www.gmperformancemotor.com/parts/19355722.html
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Joined: Dec 2006
Posts: 274
Likes: 12
From: Hoffman Estates Il
Car: '88 IROC T5 Vert ‘13 Vette
Engine: 305 TBI
Transmission: T5
Axle/Gears: 3:08
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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Re: Best aftermarket 427 crate motor
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Joined: Mar 2017
Posts: 4,255
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From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
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.
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.
Thread Starter
Member
Joined: Dec 2006
Posts: 274
Likes: 12
From: Hoffman Estates Il
Car: '88 IROC T5 Vert ‘13 Vette
Engine: 305 TBI
Transmission: T5
Axle/Gears: 3:08
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.
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.
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: Best aftermarket 427 crate motor
he ships
Member
Joined: Jan 2014
Posts: 170
Likes: 0
Re: 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.
It’s use would be 99% street, keeping the 3:08 rear end & close ratio 4 speed Muncie. It also presently has 1 3/4” headers with 2 1/2” bumper exit exhaust.
I have not heard all together positive things about crate 427’s 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 .050” range with a the true 10 to 1 compression ratio & a mech sec QFT carb, keeping a Performer RPM air gap for hood clearance
I’m 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. I’m sure something’s left out here, hope you get the idea.
Looks like I’m living vicariously through this guy!
Thanks
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.
It’s use would be 99% street, keeping the 3:08 rear end & close ratio 4 speed Muncie. It also presently has 1 3/4” headers with 2 1/2” bumper exit exhaust.
I have not heard all together positive things about crate 427’s 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 .050” range with a the true 10 to 1 compression ratio & a mech sec QFT carb, keeping a Performer RPM air gap for hood clearance
I’m 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. I’m sure something’s left out here, hope you get the idea.
Looks like I’m living vicariously through this guy!
Thanks
Here is a copy and paste on the last 427 I built a few months ago.
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
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
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
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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Re: Best aftermarket 427 crate motor
Joined: Feb 2017
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From: Meriden, CT 06451
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: Best aftermarket 427 crate motor
http://www.competitionproducts.com/P.../#.W8Usjhuovcs
http://www.competitionproducts.com/D.../#.W8Ut9Ruovcs
http://www.competitionproducts.com/D.../#.W8Ut9Ruovcs
Last edited by NoEmissions84TA; Oct 15, 2018 at 07:17 PM.
Thread Starter
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Joined: Dec 2006
Posts: 274
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From: Hoffman Estates Il
Car: '88 IROC T5 Vert ‘13 Vette
Engine: 305 TBI
Transmission: T5
Axle/Gears: 3:08
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.
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.
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
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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Joined: Dec 2006
Posts: 274
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From: Hoffman Estates Il
Car: '88 IROC T5 Vert ‘13 Vette
Engine: 305 TBI
Transmission: T5
Axle/Gears: 3:08
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.
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.
Joined: Mar 2017
Posts: 4,255
Likes: 427
From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
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.
GD
GD
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Member
Joined: Dec 2006
Posts: 274
Likes: 12
From: Hoffman Estates Il
Car: '88 IROC T5 Vert ‘13 Vette
Engine: 305 TBI
Transmission: T5
Axle/Gears: 3:08
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.
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.
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
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.
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.
Joined: Mar 2017
Posts: 4,255
Likes: 427
From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
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.
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Joined: Mar 2017
Posts: 4,255
Likes: 427
From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
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Joined: Dec 2005
Posts: 9,919
Likes: 884
From: 53.0907° N, 113.4695° W
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.
Joined: Sep 2005
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From: NJ
Car: 1987 IROC-Z
Engine: 406 on N20 w/ EFI
Transmission: P.B. 700R4
Axle/Gears: 12 bolt w/ 3.91
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.
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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