proxemics

http://store.summitracing.com/partde...K&autoview=sku

12:1 compression engine

dart pro 1 aluminum heads 200CC

performer RPM air gap intake

holly 750dp

MSD ignition system

1.6 roker arms


is this cam ok ?

sofakingdom

iTrader: (1)

Not a real good match for the heads; doesn't open the valves enough to take advantage of their flow.

Also, it's a VERY old design; not real aggressive lobes, a relic from the days when you couldn't get very good valve springs. We can do better than that nowadays. A roller would REALLY be the way to go.

You've got a really high CR figure there, which if accurate, is a race-gas-only type deal. No point in putting a highly compromised street cam in it. Are you POSITIVE about the compression? What's your dome/dish/valve relief size, your deck clearance, and what head gaskets are you using?

F-BIRD'88

Yes its "ok". As long as this cam grind has been kicking around its still a good hot streetracer/bracket cam. It works.
Degree it in on a 102 to 104 degree intake C/L.
Needs a "3500 stall" converter and a good bit of rear gear ratio, as it likes to rev.
Use a good hi rev anti pump up hydraulic lifter like Isky Super-Lifters.
If your heads valve springs have dual spring coils, remove the inner coil of each
valve spring, break in the cam and motor and then reinstall the inner valve spring coils after its all broke in.

Needs a lot lot lot of spark timing at idle to idle correctly. (distributor advance curve mods required) Minimum 24deg BTDC @ idle. Some people just lock out the mechanical advance in the distributor and run 32 to 36deg timing with this cam.
Has a rough idle and low intake manifold vacuum. Power brakes may/will be marginal.
Swap the power valve in the holley carb for a 3.5" or 4.5" power valve. (Auto trans)
3500-6500 rpm range

12:1 compression will require high octane racing fuel.

proxemics

Combustion Chamber Volume 64cc
pistone dome -5cc

head gasket will use 0.062 thick

sofakingdom

iTrader: (1)

What's the deck clearance? (very important)

proxemics

I have to look for this

sofakingdom

iTrader: (1)

Here's why it's important, and how important it is:

383, 64cc heads, .039" head gasket, flat-tops, 6cc valve reliefs, ZERO deck clearance: CR = 11.0:1

Same motor, except .025" deck clearance (stock): CR = 10.4:1

Same motor, except .045" deck clearance (TRW pistons): CR = 10.0:1

Same motor, .028" head gasket, zero deck clearance: CR = 11.3:1

Same motor as above, except NO valve reliefs (not possible in the RW, but a common "calculating" mistake people make: CR = 12.2:1

Get the point? The details you HAVEN'T told us about yet, that are typical variables you encounter when building a motor and "claiming" that it has some CR or other, have made the CR vary from 10.0:1 to 12.2:1.

Just throwing out some random number like that without a COMPLETE factual basis, is the path to destruction.

Details matter. Gõd is in the details. So is the Devil. Which one is lurking in there waiting for YOU?

Sonix

iTrader: (1)

What part number are the pistons as well? -5cc dome doesn't really make a lot of sense. If the block hasn't been decked then along with the piston part number we can give you a (semi)-educated guess at the CR.