www.the351cforum.com

ALL things related to the Ford 351C
It is currently Sun Aug 09, 2020 6:34 am

All times are UTC - 5 hours




Post new topic Reply to topic  [ 9 posts ] 
Author Message
 Post subject: Q code build
PostPosted: Fri Jul 17, 2020 9:47 pm 
Offline

Joined: Mon Dec 31, 2012 1:15 am
Posts: 103
I will be putting the 4V open chamber cleveland back in the 72 mach 1. I rebuilt this engine years ago with kB hyper pistons ( trw forged were on national back order), but has very few miles on it. I will clean it up and reassemble with new bearings and rings. This will be a street car cruiser that still has respectable power. It is 9.5:1 compression zero decked with my 76cc heads. I have a blue thunder dual plane with equalized runners, Holley 750 carb, hooker comp headers, Wide ratio c6 with 2800-3k stall, 3.50 gear, 28” tire. I want to retain enough vac for good power brakes
I have a custom solid flat tappet cam that I used to run in my 408. It is 268/273 seat 239/244@ .050, .615” .598 lift, 110 lsa, 106 icl. I don’t plan on pushing this past 6300-6500 rpm tops. I’m thinking of it like a stockish 351CJ with a little extra. I may possibly go with a different cam, but I wanted to get opinions for this one, since I already have it. That can help with the budget on the 408.


Top
 Profile  
 
 Post subject: Re: Q code build
PostPosted: Sat Jul 18, 2020 5:32 am 
Offline

Joined: Mon Oct 29, 2012 9:05 am
Posts: 2694
It's not optimal, but if you have it, run it. It will let you make plenty of vacuum for your brakes, but it will be down on power.

_________________
Brent Lykins, Lykins Motorsports
www.lykinsmotorsports.com
brent@lykinsmotorsports.com


Top
 Profile  
 
 Post subject: Re: Q code build
PostPosted: Tue Jul 21, 2020 8:51 am 
Offline

Joined: Mon Oct 29, 2012 1:52 pm
Posts: 711
That's going to be a lot of cam in a stock size engine pulling around a Mach 1 on the street.


Top
 Profile  
 
 Post subject: Re: Q code build
PostPosted: Tue Jul 21, 2020 9:46 am 
Offline

Joined: Tue Nov 06, 2012 12:02 pm
Posts: 381
What's involved in the equalized runners on the blue thunder dual plane? I remember dan jones mentioning something about it but I don't remember what was actually done.


Top
 Profile  
 
 Post subject: Re: Q code build
PostPosted: Tue Jul 21, 2020 12:36 pm 
Offline

Joined: Mon Oct 29, 2012 9:05 am
Posts: 2694
Most intake manifolds can stand a little work to make them balanced across all the ports.

_________________
Brent Lykins, Lykins Motorsports
www.lykinsmotorsports.com
brent@lykinsmotorsports.com


Top
 Profile  
 
 Post subject: Re: Q code build
PostPosted: Wed Jul 22, 2020 6:24 am 
Offline

Joined: Mon Oct 29, 2012 1:52 pm
Posts: 711
booyah45828 wrote:
What's involved in the equalized runners on the blue thunder dual plane? I remember dan jones mentioning something about it but I don't remember what was actually done.


If you put a 4V head on the flow bench and then connect the intake manifold and flow test each runner one at a time you'll find that the bottom 4 runners generally flow much better than the high side runners. Without looking at my notes I think that number 8 is the worst but working on just the plenum area can make a big improvement. Giving it a generous radius helps a lot as does cutting down the center divider but I would only do that on a larger engine. I'd leave it alone on a 351.

You can never get them all to be "equal" but you can help the bad ones a lot and it seems like in back to back testing the modified Blue Thunder was more than 20 horsepower better than the unmodified Blue Thunder on a 500 horsepower 408.


Top
 Profile  
 
 Post subject: Blue thunder mods
PostPosted: Fri Jul 24, 2020 10:05 pm 
Offline

Joined: Mon Dec 31, 2012 1:15 am
Posts: 103
I had a local porter work on my intake after talking to you a few years ago Dave. He blended the plenum entry and widened the plenum notch. Before work the runners averaged 371.5 cfm. After work they averaged 384.75 cfm at 28”. In the cam I was hoping that the short seat duration 268/274 would be ok with the car since I have decent gearing (Wide ratio c6 will be equivalent to a 3.91 gear in low, 3.73 in 2nd and 3.50 in 3rd due to lower ratios than stock) and stall Will be about 2800. But I am definitely interested in any input. I would like to be able to put a hyd roller in it. But the more I spend on this build will delay the 407 stroker build for the other car.


Top
 Profile  
 
 Post subject: Re: Blue thunder mods
PostPosted: Sat Jul 25, 2020 7:20 am 
Offline

Joined: Mon Oct 29, 2012 1:52 pm
Posts: 711
mach72 wrote:
I had a local porter work on my intake after talking to you a few years ago Dave. He blended the plenum entry and widened the plenum notch. Before work the runners averaged 371.5 cfm. After work they averaged 384.75 cfm at 28”. In the cam I was hoping that the short seat duration 268/274 would be ok with the car since I have decent gearing (Wide ratio c6 will be equivalent to a 3.91 gear in low, 3.73 in 2nd and 3.50 in 3rd due to lower ratios than stock) and stall Will be about 2800. But I am definitely interested in any input. I would like to be able to put a hyd roller in it. But the more I spend on this build will delay the 407 stroker build for the other car.


I'd use the cam since you have it. You've got some converter too. Having the E4OD gears in the trans probably is a big help. I built an E4OD for my '79 F350 and it really likes having those gears around town. Even though the transmission is very heavy it is noticeably more peppy for lack of a better term.


Top
 Profile  
 
 Post subject: Re: Q code build
PostPosted: Tue Jul 28, 2020 11:06 am 
Offline
User avatar

Joined: Mon Oct 29, 2012 2:39 pm
Posts: 1315
You might be surprised at how well that thing runs. I did similar but used a 214/224 off the shelf hydro, 4V opens, TRW Flats, 9.5:!, single plane Weiand, 750, TCI 11" 2400, 3.73 rear, C4 trans. In the Falcon at 3350 lbs, ran 8.30s~40s in the 1/8 mile.

_________________
Chris - Merkel, TX
http://raceabilene.com/kelly/hotrod
"Owner built, owner abused."


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 8 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group