Fordmods Logo

351clevo port and polish 

 

Page 1 of 1 [ 14 posts ] 

 
 Post subject: 351clevo port and polish
Posted: Wed Sep 20, 2006 9:39 pm 
Smokin em up
Offline
User avatar

Age: 32

Posts: 280

Joined: 22nd Jan 2006

Ride: XB

Location: Hobart
TAS, Australia

Gday,

I know Ive posted about this before, but anyway. My cousin and I are looking at sending our 351 heads in for a mild port and polish. I know that the CHI heads will give better results but I cant justify the $$$, all I want is a bit more flow to better suit the 750holley and a few more hp, going for a mild cam later on, nothing crazy.

Just want to know what kind of gains I can expect from getting the heads cleaned up and opened a little more. Also an old bloke who used to work on Falcons back in the day said to get the valve throats opened up.

He drew a pic of how the valves are set up and what needs to be done. Check the pic and let me know if the valves are set up like this or if he was having me on. He said to get the valves taken out and bore the throats "A" out so it is a str8 shaft.

Thanks

 

 

Attachments:
clevo valve.JPG
clevo valve.JPG [ 4.49 KiB | Viewed 735 times ]

 

_________________

76XBGS, 383c, custom crow cam, 4V p&p heads, Isky SS Valve+springs, extractors, 2.5"twins, MSD Ignition, Edelbrock intake, Forged bottom end, Barry Grant 750DP, thermo, discs, toploader, Holley fuel pump, SUPERCHARGED!

Top
 Profile  
 
 
Posted: Fri Sep 22, 2006 12:50 am 
Getting Side Ways
Offline
User avatar

Age: 35

Posts: 1037

Joined: 5th Nov 2004

Gallery: 1 images

Ride: V8 T5 Fairmont & BA XR6T

Location: Sydney
NSW, Australia

they do have a lot of excess crap in there. Ive got a couple of sets of 2V closed chambers that basically have what you have drawn there.

 

_________________

Dima, Mitch & Jay's RPD

Top
 Profile  
 
 
Posted: Fri Sep 22, 2006 1:12 pm 
Getting Side Ways
Offline
User avatar

Age: 46

Posts: 8590

Joined: 5th Nov 2004

Gallery: 5 images

Ride: AU Fairlane 5.0, KE Laser, 01 Kw

Location: Melbourne
VIC, Australia

A big thing on the Clevo is the dog leg in the exhaust port, you can't take it all out as it's not very thick and you'll hit the water jacket, but it makes a big difference if that's cleaned up.
Top
 Profile  
 
 
Posted: Sat Sep 23, 2006 2:07 am 
Getting Side Ways
Offline
User avatar

Posts: 596

Joined: 6th Nov 2004

Gallery: 11 images

Ride: BA mkII XR8

Location: NEWCASTLE
NSW, Australia

Here's something to consider if you want pretty serious power that is very streetable, I have a set of 4V heads that will be getting this treatment, the guy who is gonna do them has done a few sets now & claimes that they flow close CFM to yates & CHI alloys.
Cost is approx $1400, which is not that much more than getting them reco'ed

 

 

Attachments:
Hi port conversion.jpg
Hi port conversion.jpg [ 215.61 KiB | Viewed 45 times ]

 

_________________

Image
IF YOU HAVE IT UNDER CONTROL
YOU SIMPLY DON'T HAVE ENOUGH POWER!!!
Detroit 8V71 for sale, taking offers

Top
 Profile  
 
 
Posted: Sat Sep 23, 2006 3:12 am 
Getting Side Ways
Offline
User avatar

Age: 46

Posts: 8590

Joined: 5th Nov 2004

Gallery: 5 images

Ride: AU Fairlane 5.0, KE Laser, 01 Kw

Location: Melbourne
VIC, Australia

By the look of that he's sticking port tongues in and cleaning the heads up.
They definately help with 4V, they're a pig for down low power and tongues help give it back.
Top
 Profile  
 
 
Posted: Sat Sep 23, 2006 3:29 am 
Getting Side Ways
Offline
User avatar

Posts: 596

Joined: 6th Nov 2004

Gallery: 11 images

Ride: BA mkII XR8

Location: NEWCASTLE
NSW, Australia

Nah, he actually mills the exhaust port off where it kicks down, then fabricates an Alloy block to replace the material that has been removed, this time though the port is not just being raised at the bottom (like plates) but top & bottom is raised by up to 3/4".
The only downside is you will have to modify you're headers or get custom made

 

_________________

Image
IF YOU HAVE IT UNDER CONTROL
YOU SIMPLY DON'T HAVE ENOUGH POWER!!!
Detroit 8V71 for sale, taking offers

Top
 Profile  
 
 
Posted: Sat Sep 23, 2006 3:42 am 
Getting Side Ways
Offline
User avatar

Age: 46

Posts: 8590

Joined: 5th Nov 2004

Gallery: 5 images

Ride: AU Fairlane 5.0, KE Laser, 01 Kw

Location: Melbourne
VIC, Australia

I'll find some pics of my Clevo heads that were done by Superflow in Sydney.

The bottoms were raised and the tops were cut and all was filled with bronze... $3500 just in machining alone, but the best pair of cast iron Clevo heads i have ever seen.
Top
 Profile  
 
 
Posted: Sat Sep 23, 2006 3:56 am 
Getting Side Ways
Offline
User avatar

Posts: 596

Joined: 6th Nov 2004

Gallery: 11 images

Ride: BA mkII XR8

Location: NEWCASTLE
NSW, Australia

Heres my clevo thats getting the treatment! last time it made 581hp at the flywheel

 

 

Attachments:
engine.jpg
engine.jpg [ 855.31 KiB | Viewed 15 times ]

 

_________________

Image
IF YOU HAVE IT UNDER CONTROL
YOU SIMPLY DON'T HAVE ENOUGH POWER!!!
Detroit 8V71 for sale, taking offers

Top
 Profile  
 
 
Posted: Sat Sep 23, 2006 11:47 am 
Getting Side Ways
Offline

Age: 43

Posts: 469

Joined: 4th Jun 2006

Gallery: 35 images

Ride: xy fairmont

Location: Perth
WA, Australia

I dont understand when you say you cant justify the cost of CHI alloy heads but you have a suppercharger hanging off it ?? ive got CHI 3Vs that have been ported and tidied up best money i have spent and if it made that much horsepower before emagine with a set of alloys on it crypes...... bye the heads and be done with it!!!!

 

 

Attachments:
File comment: they have been taken out to 230cc
IMG_0532.JPG
IMG_0532.JPG [ 63.09 KiB | Viewed 19 times ]
File comment: 3V tiedy up
IMG_0530a.JPG
IMG_0530a.JPG [ 37.76 KiB | Viewed 18 times ]

 

_________________

If you have it under control then you dont have enough power..
There is no replacement for Displacment..

Top
 Profile  
 
 
Posted: Sat Sep 23, 2006 12:48 pm 
Getting Side Ways
Offline
User avatar

Posts: 596

Joined: 6th Nov 2004

Gallery: 11 images

Ride: BA mkII XR8

Location: NEWCASTLE
NSW, Australia

I'm not saying "I can't jusyify the cost of alloys" no way, would I even doubt the technical advances since 69 when my 4V's were designed, but I will have a displacement of 422-460" thanks to the siamese sleeve job done on my NASCAR block, allowing me to go oversize up to .180''.
I already have the heads just sitting there, and the 6/71 will be overdriven by 10%, so the port volume will be in my favour, 340cfm @ 20" is pretty hard to out flow.
If I were to build a N/A engine I wouldn't think twice about it though.

 

_________________

Image
IF YOU HAVE IT UNDER CONTROL
YOU SIMPLY DON'T HAVE ENOUGH POWER!!!
Detroit 8V71 for sale, taking offers

Top
 Profile  
 
 
Posted: Sat Sep 23, 2006 4:08 pm 
Getting Side Ways
Offline

Age: 43

Posts: 469

Joined: 4th Jun 2006

Gallery: 35 images

Ride: xy fairmont

Location: Perth
WA, Australia

holly s**t....... i would like to see this monster of a motor do some runs ,bigcubes and supercharged mmm i want one... i hear you loud and clear..

 

_________________

If you have it under control then you dont have enough power..
There is no replacement for Displacment..

Top
 Profile  
 
 
Posted: Sat Sep 23, 2006 8:16 pm 
Getting Side Ways
Offline
User avatar

Posts: 596

Joined: 6th Nov 2004

Gallery: 11 images

Ride: BA mkII XR8

Location: NEWCASTLE
NSW, Australia

you can convert any clevo block to a big cube combo, & you will be surprised in how it changes the characteristic of the "not so free revving" torque loaded 351, into something you have to keep you're eyes on the tacho & limit it
It is expensive to get done, but the block is bullet proof as long as the machinist brazes the sleeves together in a furnace, meaning all surfaces must be re-machined true.
by the way that is a very "nice" looking package you have there. cheers kenny

 

_________________

Image
IF YOU HAVE IT UNDER CONTROL
YOU SIMPLY DON'T HAVE ENOUGH POWER!!!
Detroit 8V71 for sale, taking offers

Top
 Profile  
 
 
Posted: Sat Sep 23, 2006 10:07 pm 
Getting Side Ways
Offline

Age: 43

Posts: 469

Joined: 4th Jun 2006

Gallery: 35 images

Ride: xy fairmont

Location: Perth
WA, Australia

yer mate ive stroked my girl out to a 393 with 3Valloys H beams ,Rose race pistons sollid roller cam with 700 lift the cam produces the goods from 3200rpm to 7500rpm all crane rocker assembly funnelweb manifold 850 Demon carb all MSD altinator and dizzy C4 auto with extra clutches full manual auto 3500 stally and reverse patern shift and ive got a 150hp wet shot of nos will be finnished in next two weeks expect to have around 500hp at the treads with out gas im running 3.9 dif gears in a fully tuffened 9inch ...but we will see what the true figgers are when she hits the dyno could be less but i hope not all up she cost just over 20 thou for the build up on the donk.. there goes the house deposit lol...when she is finnished ill be posting a video so you should see her do her stuff lol as the saying goes there is no replacement for displacement.....

 

_________________

If you have it under control then you dont have enough power..
There is no replacement for Displacment..

Top
 Profile  
 
 
Posted: Sun Sep 24, 2006 11:35 am 
Getting Side Ways
Offline
User avatar

Posts: 596

Joined: 6th Nov 2004

Gallery: 11 images

Ride: BA mkII XR8

Location: NEWCASTLE
NSW, Australia

there goes the house deposit lol...
But lets face it you can't drive you're house to work .... can you!

 

_________________

Image
IF YOU HAVE IT UNDER CONTROL
YOU SIMPLY DON'T HAVE ENOUGH POWER!!!
Detroit 8V71 for sale, taking offers

Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 1  [ 14 posts ] 

Who is online

Users browsing this forum: No registered users and 10 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

 

 

It is currently Tue Dec 12, 2017 8:07 am All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names