Does any have a clue as to what Compression Ratio 041 cast heads 2.2 intake .65 exh 510 lift 242 duration cam on a sbc 400 60 over bore
Forged Flat tops with Valve insets?Just Curious cant keep a Stock Crank in it?:smash:
Sorry I made a mistake on first entry.
041 heads came off 68 to 70 350s.
They had 64cc chambers.
I could not find a listing for a .060 over bore.
According to JE Pistons; this is the info I got.
With a stock 400 5.65" rod at a .040 overbore;
5.65 rod 11.7 comp
with a 5.7 rod 11.6
You will be slightly higher.
thanks was just curious went to a 355 4140 steel crank stage 2 i rods and je forged pistons much better but i miss the Torque ill tear down the 400 this winter and she why it wont stay toghther!...thanks 4 the input!
Yes Pump gas was a no no Detonation was awful...went to a110 lowlead cured that...but after two engines i gave up first one i pulled down all mains were past the babbit...just wondered if the Compression was too much 4 a stock crank?
Bye the way only Drove it a few miles with Pump gas!
Doesn't sound like excessive compression, more like a warped crank or... the block is out of align. Replace the caps and feel around the inside perimeter where the bearing resides. If you feel a notch where the cap and block meet either the caps have been installed on the wrong mains or the block is warped.
went through all that actually felt a notch on first block and had it line bored still it ate the mains Rods were not Noticeably Damaged ? would like to redoo the 400 would u sugest a new crank? id like to Know what caused it so when i tear it down this winter im going Bearing to Bearing!but the warp is a thought!Just wondering if the external balancer could have been off enough to eat it up?
You need to have the crank checked for runout and the block rechecked on the main alignment. Is it worse on the center mains? If so, I would definately say something is not straight. I actually juste went through a main bearing failure, and mine was due to the machine shop not properly cleaning and brushing the oil passages. I specifically ask for that, but they did not do it. The next shop I took it do did, and they found rust and dirt in oil passages.