pump gas 427 sbc

General engine tech -- Drag Racing to Circle Track

Moderator: Team

prairiehotrodder
Expert
Expert
Posts: 683
Joined: Sat Dec 24, 2011 10:02 am
Location: melfort saskatchewan Canada

pump gas 427 sbc

Post by prairiehotrodder » Wed Jan 10, 2018 9:23 pm

Is it possible to build a pump gas 427 sbc that makes 700 hp N/A ? Without using exotic parts. Just plain stuff that anyone can order from a speed shop? I may be helping a friend build such a motor. We are looking at a Dart SHP 427 assembled short block with flat top pistons. Maybe around 11.5 CR and a solid roller. He already has a AFR composite race intake with a 4150 flange, an MSD crank trigger, Daytona sensors ignition box, 1.75" hooker headers, an 850 QFT carb and a real fancy moroso pan. What could we keep and what should we get rid of? What heads to use? Current motor is a 11-1 CR 383 with AFR 195 heads and a Hyd roller. Car is a 78 lemans, runs 10.80's with 4.56 gears and a turbo 350.
Brian
The Word of God is quick and powerfull
www.therocketshop.blogspot.com

bigjoe1
Show Guest
Show Guest
Posts: 6199
Joined: Thu Aug 24, 2006 8:16 pm
Location: santa ana calif-92703
Contact:

Re: pump gas 427 sbc

Post by bigjoe1 » Wed Jan 10, 2018 9:34 pm

I have done such an engine several times--- no big deal for me-- pretty expensive though




JOE SHERMAN RACING

MTENGINES
Pro
Pro
Posts: 449
Joined: Wed May 23, 2012 1:52 am
Location: MN

Re: pump gas 427 sbc

Post by MTENGINES » Wed Jan 10, 2018 9:49 pm

Depending on the pistons valve relief, limits you to the head you have to use. In my opinion I would buy an sb2 top end and order your shortblock for those heads.

Or contact someone to build you a set of heads and matching intake for your application. And hopefully the valve reliefs are in the right spot, and deep enough. You will need a pretty large camshaft. In the 268-270@050 range.

But yes as Bigjoe1 mentioned it's possible as I've also done it numerous times. What do you consider exotic

steve316
Pro
Pro
Posts: 435
Joined: Fri Apr 13, 2007 10:06 pm
Location: St.Joseph,mo.

Re: pump gas 427 sbc

Post by steve316 » Wed Jan 10, 2018 11:56 pm

Yes it can be done even with with 23 degree heads and 11.5 comp.

turdwilly
Pro
Pro
Posts: 208
Joined: Thu Mar 19, 2015 10:09 am

Re: pump gas 427 sbc

Post by turdwilly » Thu Jan 11, 2018 10:06 am


cuisinartvette
Guru
Guru
Posts: 1518
Joined: Fri Sep 05, 2008 11:39 pm
Location: Valencia Ca

Re: pump gas 427 sbc

Post by cuisinartvette » Thu Jan 11, 2018 11:46 am

have bigjoe do it, tuned dyno'ed ready to go, proven
Love to have him do one for me (dreams are for free lol)

If anyone can do it "with less" he can.....

steve316
Pro
Pro
Posts: 435
Joined: Fri Apr 13, 2007 10:06 pm
Location: St.Joseph,mo.

Re: pump gas 427 sbc

Post by steve316 » Thu Jan 11, 2018 12:05 pm

If you go with dart shp block; look at the pro-shp; billet caps all 4 bolt, bbc cam tunnel and .904 lifters. Very good bang for your buck.

User avatar
CamKing
Guru
Guru
Posts: 8491
Joined: Wed Aug 08, 2007 4:05 pm
Location: Denver, NC
Contact:

Re: pump gas 427 sbc

Post by CamKing » Thu Jan 11, 2018 12:34 pm

AFR 227 Competition Port, or AFR 235 heads
1.7 rockers
11.5-12.5:1 compression(depending on pump fuel available).
850 carb
1 3/4" stepped to 1 7/8" headers

Cam# SBCR, R79421A-80412-110
261/267 @.050"
.421"/.412" Lobe lift
110 LSA
Mike Jones
Jones Cam Designs
Denver, NC
jonescams@bellsouth.net
http://www.jonescams.com
(704)489-2449

bigjoe1
Show Guest
Show Guest
Posts: 6199
Joined: Thu Aug 24, 2006 8:16 pm
Location: santa ana calif-92703
Contact:

Re: pump gas 427 sbc

Post by bigjoe1 » Thu Jan 11, 2018 3:14 pm

Pretty similar to what I would use



JOE SHERMAN RACING

rocketracer380
Member
Member
Posts: 179
Joined: Fri Jun 20, 2014 8:41 am

Re: pump gas 427 sbc

Post by rocketracer380 » Thu Jan 11, 2018 6:26 pm

Did a 434 with afr 235's 11:1 ran on 92 small solid roller and 1000 HP carb went 132 @3400 10.1 off foot brake right off the trailer no tuning 28 degrees timing 1.47 60 ft 700 is very doable 12,000 carb to pan

User avatar
MadBill
Guru
Guru
Posts: 13229
Joined: Tue Nov 15, 2005 10:41 am
Location: The Great White North

Re: pump gas 427 sbc

Post by MadBill » Thu Jan 11, 2018 6:37 pm

As above, I'd go bigger on the carb. 1000+ CFM would lose you nothing on the bottom but gain from say 4,000 up, likely ~20 hp peak and more beyond.
Felix, qui potuit rerum cognscere causas.

Happy is he who can discover the cause of things.

greywolf
Expert
Expert
Posts: 596
Joined: Sun Dec 09, 2007 10:50 pm
Location: Alberta

Re: pump gas 427 sbc

Post by greywolf » Fri Jan 12, 2018 11:36 am

Lots of good advice so far;
if it were me building this 427 I would opt for the AFR 245 heads and a slightly larger duration cam from Jones. I'm assuming this engine will spend most of its time on the strip??
My nephew went from a 210 to a 235 on a 427, and he wishes he bought the 245 heads. His application is strictly racing though.
When I turned 47 years old, I entered into my 5th decade of drag racing.

SPDYPETEY
New Member
New Member
Posts: 21
Joined: Sun Apr 19, 2015 1:00 pm
Location: FLORIDA

Re: pump gas 427 sbc

Post by SPDYPETEY » Fri Jan 12, 2018 11:53 am

I had a 427 sbc 3.875 stroke
Pump gas I used the same cam as Cam king mentioned but on 108.
I had AFR 245 heads and super vik2 1050 carb 4150.
In Fox body w 3.73 pg and 10" nos Converter.
Full interior went 9.90s
Same motor on q16 and loose 5500 motor Converter went 9.51@143
Went real good on NOS.
DROVE IT EVERYWHERE..
BEST 1/8TH MILE WAS 5.23@131 ON 85 JET BIG SHOT PLATE

User avatar
CamKing
Guru
Guru
Posts: 8491
Joined: Wed Aug 08, 2007 4:05 pm
Location: Denver, NC
Contact:

Re: pump gas 427 sbc

Post by CamKing » Fri Jan 12, 2018 12:14 pm

MadBill wrote:
Thu Jan 11, 2018 6:37 pm
As above, I'd go bigger on the carb. 1000+ CFM would lose you nothing on the bottom but gain from say 4,000 up, likely ~20 hp peak and more beyond.
He already has the 850 carb, and that'll handle over the 700hp goal he has.
Mike Jones
Jones Cam Designs
Denver, NC
jonescams@bellsouth.net
http://www.jonescams.com
(704)489-2449

NormS
Member
Member
Posts: 179
Joined: Sun Dec 13, 2015 10:21 am
Location: Vassar,Michigan
Contact:

Re: pump gas 427 sbc

Post by NormS » Fri Jan 12, 2018 12:22 pm

A nicely modified 850 will be over 1100 CFM, and will help the torque and power through the whole usable RPM range. With a right calibration, the low speed characteristics will be good , too. 700HP consumes roughly 900CFM+, so an unmodified 850 would be a little small.
Competition Fuel Systems Vassar, MI. www.compfuelsystems.com 520-241-2787

Post Reply