Clevo120Y 815 Posted August 29, 2014 No worries mate, yeah the bowl work will work wonders and getting the throat out to the 89% range will increase flow as the throat really tappers in quite a lot. Will keep you posted on the heads next week. 1 ando76 reacted to this Share this post Link to post Share on other sites
Clevo120Y 815 Posted August 29, 2014 Also I will dig out an open chamber head and chuck it on the bench for you Tony, I don't expect a big difference between the 2, maybe a little more low lift flow. 1 ando76 reacted to this Share this post Link to post Share on other sites
ando76 4,354 Posted September 2, 2014 and the open chamber figures are???? Bahaha - I know you are a busy man. 1 Clevo120Y reacted to this Share this post Link to post Share on other sites
gerg 10,871 Posted September 2, 2014 Really does back up the advice of not going too much past 0.500" if using stock 2Vs. 2 ando76 and Clevo120Y reacted to this Share this post Link to post Share on other sites
Clevo120Y 815 Posted September 2, 2014 Hopefully today Tony Share this post Link to post Share on other sites
ando76 4,354 Posted September 3, 2014 yeah anything past .500" on standard heads would be a waste of mechanical effort. I'm hoping the bowl and seat will make some gains in the high lift and cam's awesome seat cut will get the low to mid lift figures up. I just want something with good low down grunt and a bit of a lump. Keeping the stock look is really important to me on this build - that is why I am stoked that roller rockers fit under the stock tappet covers. I'm still not 100 on the cam but that Lunati profile is right up my alley. Share this post Link to post Share on other sites
Clevo120Y 815 Posted September 3, 2014 Stock open chamber 2V's IN EX 050 30.72 18.77 100 60.46 46 150 89.86 71.14 200 116.8 89.58 250 144.57 104.35 300 167.29 120.14 350 182.56 130.33 400 191.22 141.57 450 199.82 149.04 500 198.32 154.82 550 200.49 158.25 600 201.49 162.6 650 201.46 163.41 So much of a muchness between OC and CC really. Share this post Link to post Share on other sites
Clevo120Y 815 Posted September 3, 2014 Here are some pics of the stock intake and exhaust ports. Intake Exhaust Chamber Share this post Link to post Share on other sites
gerg 10,871 Posted September 3, 2014 Wow that is pretty disgusting... Um.... I mean plenty of room for improvement there. If I ever need to rip my heads off they'll be getting a tidy up for sure. 1 Clevo120Y reacted to this Share this post Link to post Share on other sites
ando76 4,354 Posted September 3, 2014 Um yes - very ordinary. When I sent my heads down to cam they were as I pulled them off the engine. Now I see what you were talking about with the bowl and throat. That is just plain ordinary. I can see high lift gains already and low lift as well with just a bit of time on the grinder. I'm thinking that we may be damn close with that cam selection after the bowl and seat job. Thanks for taking the time to test them Sean - knowledge is power. You are a champ. 2 gerg and Clevo120Y reacted to this Share this post Link to post Share on other sites
Clevo120Y 815 Posted September 3, 2014 No worries mate, I'm actually going to start these heads today LOL Share this post Link to post Share on other sites
gerg 10,871 Posted September 4, 2014 I used to be a member of Fordmuscle.com and it's a paywalled forum/magazine with some excellent projects. They love their Clevos and did a very in-depth study of 2V and 4V port design. I can't access the pics right now but found a few that might benefit folks on herethis 2V exhaust is on a smog head, most probably off a 400/351M. Much worse than a pre-smog 2V but note the meat around the short-turn and seat.4V exhaust for comparison2V inlet 2 ando76 and Clevo120Y reacted to this Share this post Link to post Share on other sites
Clevo120Y 815 Posted September 4, 2014 Thanks mate, just saved me time looking for these 1 gerg reacted to this Share this post Link to post Share on other sites
gerg 10,871 Posted September 4, 2014 I had some really good pics (from FordMuscle) of silicone port mouldings of both a stock 2V and Edelbrock alloys and the difference was like chalk and cheese. The Edelbrock looked like a 3V but with a stock port face location. The good thing about silicone mouldings is that they show a 3D image of all the problem areas. Both stock 2V and 4V ports have a noticeable pinch where the pushrod goes past, not obvious from the outside but very much so on the moulding. Share this post Link to post Share on other sites
ando76 4,354 Posted September 4, 2014 Look at the gains in the short turn and the reduction in x sectional area where the valve guide comes thru. Massive gains to be had there safely. also on the high speed side about 15mm up from the seat. Need to get these photos to Cam asap. thanks for sharing guys - awesome stuff. Share this post Link to post Share on other sites
Hofiveo 47 Posted September 6, 2014 Top work sharing those flow numbers mate. How was the air speed on the stock 2vs and at what lift did you find the air flow gets to turbulant. When you get around to working your magic on the 2vs are you chasing cfm or alot more air speed through the port. Share this post Link to post Share on other sites
gerg 10,871 Posted September 6, 2014 I think the trick is to chase both. This is where the black art of head porting lies, and is the concept behind the CHI 3V. Smaller port than a 4V, yet outflows it. Share this post Link to post Share on other sites
ando76 4,354 Posted September 7, 2014 Air speed is king. you can get cfm at high lift by making a big hole - trouble is the engine will have nothing down low. Good low lift figures and high lift can be attained - you just have to know your shit - and have a flow bench to test what you are doing. Share this post Link to post Share on other sites
Hofiveo 47 Posted September 21, 2014 Any updates yet. Keen to see how your going with them. Share this post Link to post Share on other sites
Clevo120Y 815 Posted September 21, 2014 Not yet sorry mate, have been sidetracked with the speedway season about to start up again, the off season went really fast and I have a long list of things to do for a few cars this year Share this post Link to post Share on other sites
gerg 10,871 Posted November 9, 2014 Hey (sort of) on the subject... What kind of restriction is the stock iron 2V 4-barrel manifold? I've heard that they're not a bad thing compared to most stock units but want to know what kind of upgrade it would be going aftermarket. My wife just smoked me in a new Aurion V6 and it's really gotten to me. Share this post Link to post Share on other sites
ando76 4,354 Posted November 9, 2014 Cam has flow tested them and says they are shit, hence the recommendation of the performer for my package. that's all I know mate. I know the 4v one I have here is seriously bloody heavy. 1 gerg reacted to this Share this post Link to post Share on other sites
gerg 10,871 Posted November 9, 2014 Yeah I've straddled the shock towers with one foot on each trying to lift one off, beats leaning over the engine and stuffing your back! Shall keep an eye out for a Performer or Weiand (supposed to be good). Share this post Link to post Share on other sites
wagoon 2,429 Posted November 9, 2014 Look at an Air gap manifold greg. Works really well on a clevo if your not concerned about an after market manifold and I also think bonnet clearance may be an issue dependant on the car its going into. Air gap works like a dual and a single plain manifold Share this post Link to post Share on other sites
XPT 673 Posted November 9, 2014 Might need a shaker for the Griswold mobile 1 gerg reacted to this Share this post Link to post Share on other sites
