Hey folks is this cam about right for the 60cc Heads.

UPC:036584024774
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 1,000-5,500
Intake Duration at 050 inch Lift: 203
Exhaust Duration at 050 inch Lift: 216
Duration at 050 inch Lift: 203 int./216 exh.
Advertised Intake Duration: 255
Advertised Exhaust Duration: 263
Advertised Duration: 255 int./263 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.469 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.505 in.
Valve Lift with Factory Rocker Arm Ratio: 0.489 int./0.505 exh.
Lobe Separation (degrees): 110
Grind Number: 255DEH
Computer-Controlled Compatible: No
Lifters Included: Yes
Lifter Style: Hydraulic flat tappet
Valve Springs Included: No
Retainers Included: No
Locks Included: No
Valve Stem Seals Included: No
Timing Chain and Gears Included: No
Assembly Lubricant Included: Yes
Pushrods Included: No
Rocker Arms Included: No
Gaskets Included: No
Valve Springs Required: Yes

 

I DO believe that you are totally right, 60cc is way to small for the 400 piston selection, only Tim Meyer used to have the right piston for it but not longer available.
Im left with two choices here. Exchanging the 60cc heads for the 72cc or custom pistons.

 

I originally was going to run E85, so I purchased 60cc chambered TFS195 power ports. Later I cam to my senses, a couple months later, and I exchanged them thru summit. One of the main reasons I shop at summit, they have let me make some ridiculous returns where if they denied them I would have understood, completely my fault. I hope you are so lucky and you can exchanged yours for a head with a more user friendly chamber size. Either way, others and I will be here on FTE to help you get it sorted. I know for one, I couldn't have built my 400 without this forum and the help of others. Good Luck.

 

That comp cam has the intake valve closing too early (53) to avoid being a ping monster.

An Edelbrock 2172, or equivalent, with the intake valve closing at +/-70 would be better.

That said, it depends on what customising can be done, and the calculations of the 'entire package'.

Assuming the KB148's can have the dishes machined out to 20cc, from 13cc, and assuming that the deck clearance will in fact be 0.015 and doesn't need machining, then the SCR would be 10.10 and the DCR would be +/-7.80.

The squish with that combo would remain under 0.06 which is efficient.

Food for thought !

Sorry, I used 351c deck figures instead of 400 deck figures.

As already mentioned, the pistons will sit too low in the bores.

 

ok, assuming a .030 overbore, 60cc heads and a .041 head gasket that has a 4.1 bore, running a TMI piston with a 13.3cc dish, zero decked. I get a CR or aprox of 11.17 to one. With the cam you mentioned ran strait up, I get a DCR of 9.62. WAY WAY to high for pump fuel. you need about 74* intake closing to get you down to about 8.0 DCR, exceptable for pump gas (most likely premium, may be ok for pump 87). It would take a duration of around 300* advertised to get you where you need to be. That's going to be a fairly high rpm cam. It can be done, but its going to be high strung. Even with a 72cc head your pushing 8.5 DCR witch is still too high, simply put, that cam is too small. With a 72CC head you want around a 60* intake closing point to get down around 8.0DCR, think comp cams 268H. I'm running a 252H zeroed straight up (read 4* retarded to remove the 4* advanced that's been ground into the cam) to get a closing of 56* that give me a 8.27 DCR, its premium only but has a ton of low end torque. That's with a .047 head gasket and my pistons .001 above deck with a .020 overbore.

 

This cam retarded 4* would get you down to a 8.06 dcr https://www.summitracing.com/parts/c...34-4/overview/

this cam ran strait up would give a dcr of 7.86 https://www.summitracing.com/parts/c...35-4/overview/

This cam ran strait up gives a dcr of 7.9 https://www.summitracing.com/parts/l...0494/overview/

The last cam would be your best bet but still, its a huge cam, requiring a high stall converter (if running a auto) and lower gears to get the drivetrain matched to the cam.

 

Is the standard 400 deck clearance 0.0565 ?

If yes, then maybe I'm not talking crap after all !

The KB148's would reduce the deck clearance to 0.0365.

Machining the deck by 0.01 would further reduce it to 0.0265.

Add that to a 0.041 gasket and the squish wouldn't be too bad.

Machine the dishes to 18cc and the SCR would be 10.05.

Machining the flat surfaces of the pistons wouldn't do the squish any favours.

Once the 'customising' is worked out, then a cam could be selected.

 

It looks like 0.0565 is correct.

I get the same +/- 11.17 SCR as kopfenjager when using it.

Zero deck clearance is my first choice.

If the piston dishes can be increased to 22cc's, then together with a zero deck the SCR would be 10.20, which is very acceptable.

Still couldn't use the comp cam though.

I think at this stage the question is, what machining can be done to the pistons without compromising reliability etc ?

Once that is known, the planning can continue.

 

Im still lost here. The guy from Summit put all the parts together and he sounded like a very knowledgeable guy. Basically I got everything from them except for the pistons and I see why now. Never trust a sale person. I think i got scr...wed here. I do remember saying I wanted to be 9.5:1 CR.
Anyways returning some of the stuff shouldn't be a problem with Summit. I think I rushed myself in to it, I should have come here and do some homework before following a salesman pitch.
I'm running 35" tires and 4.11 gears, still in package torque converter TCI 441500
High Torque Street Converter 1971-91 Ford C6
kopfenjager and full metal jacket your comments and advise are greatly appreciated.

 

Machining the pistons maybe a solution, but I doubt it and .060 is a pretty wide deck clearance. I would try to be below .050 at least and .040 would be best. That said, I'm running .046 so there is that. best bet, is again chamber size or custom pistons. Custom pistons would be cheaper than buying new heads, unless you could sell your heads for a decent price.

 

If you bought from Summit by there advice, you should have no trouble exchanging them for a set of TFS heads, like these https://www.summitracing.com/parts/t...-c00/overview/

And they flow a lot better then the edelbrock heads. Then get you some pistons from Tim and your all set. Next just choose a cam with at least a 60* intake valve closing point and you will be golden!

 

I will get pistons made for this application making sure that CR and quench are within specs for a good running pump fuel engine.

 

that will work, I believe you should be somewhere around a 24-25cc dish. that's with a 60cc chamber and .041 deck.

 

Tmeyer had them dished to +30cc and 1.71 Compression Height, 0.030 over paired with the Aussie heads so around that I would say. I will keep you posted.

 

that would work, it would put you around 9.45cr and with the 255DEH you would be around 8.165DCR. thats with a 4.03 bore, 0.041 gasket and zero decked pistons.