Re: 427 overheat

[Michael Ketterer]

Mike
well still in shop.
had 66 in it went to 77 would run at 195' but black as coal out the pipes
but found another problem, part of would be me!
If so will share with ya,
Michael

[Michael Ketterer]

Re: 427 overheat

Mike and all,
My mechanic said he had heard that some times the big blocks would suck some of the intake gasket down enough to make a bottom end vacume leak.(Even though you could not find a leak of any kind on the out side of the motor, carbs included)
He tore the intake off and thats just what it was, he has ordered in some high performance intake gasket for the car and says it will fix the problem!
If it dose I will post the name of shop and mechanics name.
They have always treated my famley right on fixin are cars.
Michael k

[Michael Ketterer]

Re: 427 overheat

To all
Been around the world with this car have had intake back off and timing cover,
nothing wrong with intake seal, timing check dead on crank and cam.
heads are pushing 160 psi per cylinder,( told thats like 11-11 1/2 compression?)) did find that the front and rear carb flaps were not closing all the way, stopped that vacume leak.
Car runs like a jet for about 20 min (( no overheat )) but starts loading up,
have to take it up to 80-90 mph to clear out,

I was told with my compression that I will have to run racing fuel 104 oct
whats the forum thoughs on this??????????
lost
Thanks
Michael k

[Duke W.]

Re: 427 overheat

Cranking compression pressure is no basis for estimating CR. The closing point of the inlet valve has a HUGE effect; 160 is not that high.

Suggest you include year, engine option, detailed symptoms, what you've done, etc. Maybe you've discussed this before, but we can't remember every discussion.

What you get in return is only as good as the quality of information you provide.

Duke

[Joe C.]

Re: 427 overheat

Also, do a wet and dry compression test comparison, or, better yet, a leak down test.

[Mark #28455]

compression ratio

I have one engine with known 10.3:1 real compression ratio (static). It's running a cam intake lobe that's very similar to the stock 435 HP cam and the cranking pressure (with all spark plugs removed) is 175 PSI. It actually runs OK with the stock 435 HP ignition settings on 93 octane pump gas, only a tiny bit of knock under full throttle at about 2800 to 3000 RPM.

You may find your engine runs fine on pump gas too.
Mark