[Goblin]

Ive been looking at CHI 3v/4v heads for clevelands. I know alot of guys have been using them, other than the weight difference... are they worth using over my Boss heads?

Also, im going to start tearing down the clevor that i bought recently.. if the block checks out okay... whats the power capabilities with it? Thanks guys.

[fastgtfairlane]

i would imagine 700+ hp with those heads is capable. ive seen a set of those heads in person and they are very nice. they pretty closely mimic the yates ford racing heads. they are quite pricey too but going fast isnt usually cheap. especially n/a.

[Goblin]

Thanks for the response. Actually, yates, glidden.. ford racing heads mimic the cleveland heads.

Im not concerned with the amount of power i can make. My concern is what is the block good for?

[fastgtfairlane]

what year is the block you have?

[Goblin]

1970

[fastgtfairlane]

i doubt it would handle 1,000 hp but it would handle atleast 600 to 700hp at least. how much power do you want to make?

[Goblin]

Well, i havent completely decided yet. My original plans were to build a stroked 351w... but then i came across the clevor, and picked it up and am now interested in putting it together instead of a windsor. I originaly wanted 550-600hp N/A from 408-420ci on pump gas.. i'd like to see similar performance if i go this route.

[fastgtfairlane]

that shouldnt be hard at all with the cleveland style heads especially the chi heads.

[woody1]

back up for me, you got a stock stroke windsor with a cleveland head? Which head first off

[ryans88gt]

CHI makes awesome products, I have heard almost nothing bad about them other than they are pricey.

BTW procomp makes a knockoff 3V aluminum cleveland head that is significantly cheaper, but they will need some work when you get them.

[Goblin]

Originally Posted by woody1 back up for me, you got a stock stroke windsor with a cleveland head? Which head first off

Huh? I have an all cleveland 351... not a windsor with cleveland heads. I was going to build a windsor, and was looking for one.. but i came across the cleve instead.

I just realized a typo i made in another post ^^ The engine is a 71 4v (Boss).

[Goblin]

Originally Posted by ryans88gt CHI makes awesome products, I have heard almost nothing bad about them other than they are pricey. BTW procomp makes a knockoff 3V aluminum cleveland head that is significantly cheaper, but they will need some work when you get them.

Yeah the price is high. This is why i was asking is there really any difference in performance over the Boss heads.... I know they weigh less, but is there any reason to spend the money on them if my boss heads will give me what i want? This is my main question.

[fastgtfairlane]

roush used to use the cleveland blocks in racing all the time. they are quite beefy. i just sold mine to my neighbor to build for his 70 mach 1. even the 2 bolt blocks are very stout. way beefier than the 302 blocks for sure. the only thing you will want to do is upgrade the oiling system. ive seen guys run oil lines to the lifter valley to help with that issue. i have a torker 4v manifold that im trying to sell too if you want it.

[fastgtfairlane]

i personally think your boss heads will give you what your asking for. i would even get some bowl work done on the boss heads.

[Goblin]

Is it even a good idea to do any port work to a Boss head? I remember seeing woody tell someone not too. In the back of my mind, i have the weight thing.. and its bugging me. That single handidly is making want the aluminum heads... but i really think the boss heads are just as good. I just need advice from someone who knows clevors.

[1slo5.0]

CHI makes some great products. Guys have been kicking ass in the Engine Masters with CHI heads and intakes.

[fastgtfairlane]

i really did my research on the clevelands because i was gonna build one for a car that i no longer have so i ended up selling the engine. i flow benched one of my heads when i was at nti. the intake side flowed just over 300 cfm at .700 lift at 29hg of vacuum. the exhaust side needed work however. a lot of guys in the old days before all this aluminum heads came out would raise the exhaust ports to make them flow better. all i was talking about was cleaning the valve guide bosses and just removing any burrs and such. also unshrouding the valves is all those heads need. the clevor engine is actually a windsor block with cleveland heads on it.

[ryans88gt]

Originally Posted by woody1 back up for me, you got a stock stroke windsor with a cleveland head? Which head first off

Yes I do, DO 4V closed chamber heads on a 78 351w block with the B&A track boss intake. I almost bought the parker intake back when terry was still making clevor intakes, but the B&A was $100 cheaper...I wish I would have bought the parker now...

[ryans88gt]

Originally Posted by Goblin Is it even a good idea to do any port work to a Boss head? I remember seeing woody tell someone not too. In the back of my mind, i have the weight thing.. and its bugging me. That single handidly is making want the aluminum heads... but i really think the boss heads are just as good. I just need advice from someone who knows clevors.

The weight is only about 50-60 lbs difference between the iron heads and the aluminum heads. At $2500 for the aluminum heads, you can easily drop that weight somewhere else, like K-member and A-arms, or removing the front bumper and support.

however, the CHI heads will have better velocity and flow than the 4V boss heads.

[ryans88gt]

Originally Posted by fastgtfairlane roush used to use the cleveland blocks in racing all the time. they are quite beefy. i just sold mine to my neighbor to build for his 70 mach 1. even the 2 bolt blocks are very stout. way beefier than the 302 blocks for sure. the only thing you will want to do is upgrade the oiling system. ive seen guys run oil lines to the lifter valley to help with that issue. i have a torker 4v manifold that im trying to sell too if you want it.

A lot of the stock blocks suffer from core shift and have thin cylinder walls in places. The right block will handle lots of power, but finding that right block might take you 3 or 4 trips to the junk yard and some sonic testing.