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New camshaft time! 377 in Cleveland with CHI 2V heads. IT RUNS! Video on page 2
#1
[Image: BFE508_EC_7_CEA_44_D4_8_C69_C66_CA13588_F7.jpg]

Long story short I need a new cam and lifters.

Engine is a stroked 351C (377 now) with CHI 2V heads (60-66cc chamber depending on where the numbers come from)

Static compression with .040 head gaskets is just about 11:1 dead on.

Cam that was in it was a Crower 15244

I want a hydraulic flat tappet setup that is similar (if not identical). Going over .550 lift does not really gain me anything with the CHI heads.  The engine made 425/425 with the 15244, while it was eating a couple lifters.  Some level of vacuum for a brake booster is needed.


https://www.summitracing.com/parts/hrs-238041-09

https://www.summitracing.com/parts/isk-431281


https://www.summitracing.com/parts/edl-7168


https://www.summitracing.com/parts/lun-10320703


Ideas?
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#2
What are you going to use for fuel? Did you like the old cam? What oil are you using? Chuck
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#3
Just curious why you want to go with flat tappets, again, after your experience with the last flat tappets cam?



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#4
(04-14-2018, 11:42 AM)c9zx Wrote: What are you going to use for fuel? Did you like the old cam? What oil are you using? Chuck

I’d like to run pump gas...  might reduce static compression with thicker head gaskets if needed.

Unknown on the oil, a couple of the lifters died on the the dyno, and I didn’t find out until this past week.
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#5
(04-14-2018, 12:11 PM)Don C Wrote: Just curious why you want to go with flat tappets, again, after your experience with the last flat tappets cam?

I am happy in the 415-450 horse range.

Also seems like several folks have had roller lifter failure, which does not inspire confidence.  Between this forum and Mustang steve’s site there have been a few comp roller lifter failures.  Flat tappet is simpler if I can get them to break in without death.  All that being said, I am no expert.

The outfit that built the engine up for me isn’t really around anymore.  They chose some pretty heavy valve springs with a closed pressure of 124 or 129 pounds (can’t decipher the hand writing.  Open pressure was 365.  I do not know if they just ran the outer springs for cam break in, or what combo of lube they used.  All I know is that 2 lifters are on the highway to doom,

I am taking those valve springs and tossing them in the trash.

Going with some beehives that are about 110 closed and 336 at .575.


I need to get on something that allows me to use your dynamic compression calc (my phone won’t work). Then go ahead and order up whatever cam / lifter / head gasket combo that will get me where I can squeak by on pump gas
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#6
Sorry to hear it died on the dyno, I know what that feels like. One indicator that cam and lifter break-in will go well is to index the top edge of the lifter and the lifter bore with a Sharpie, assemble the valve train and turn the engine over by hand several times to see if all the lifters are rotating. If they are it is a good sign, if not it doesn't bode well. An EDM oiling hole in the lifter is said by many to reduce wear. The Driven or Schneider assembly grease works well. The Maxima break-in oil also works well, as do several others. 11:1, pump gas, and mid-range cam could be a real problem. Whatever you decide to go with, I hope all goes smoothly. Chuck
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#7
I dug up the ancient IBM laptop and got Dons calc on it.

So, with .040 head gaskets my static is 11.08:1 with flat pistons, mine actually have reliefs in them so I need to measure  the volume and correct my static.

Using Dons calc my dynamic with the Crower 15244 works out to 8.4:1
Edelbrock 7168 7.45:1




More info...
[Image: 2_E41932_A_46_D6_4_BA9_8_C7_C_34_E8_C58_FB735.jpg]

[Image: C27_DE959_3_EB0_42_DE_A3_AE_E0_DD4_DBC518_E.jpg]

[Image: 21801_DFE_57_D5_4_F53_BB87_74_FDBA623_B06.jpg]
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#8
I believe that 2 reliefs are in the 15cc range.

8.4:1 puts you into the pump gas range, especially with aluminum heads.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
  Reply
#9
Just out of curiosity what brand lifters??? I had a ton of trouble with comp. Had multiple failures.

Kevin

1971 Mach 1
408C Stroker
C4 w/3,000 stall
8.8" Rear w/3.73's
Disc brakes all way around.

[Image: 28ivsix.png]




                                                                                             
  Reply
#10
Honestly I don’t know what brand they were.

Scratch that!

Found the invoice. Lifters were Comp brand
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