What are Chevy 202 heads?
What are Chevy 202 heads?
“202” heads refers to the intake valve size. Back in the late 60’s and very early 70’s GM produced some performance heads and used large 2.02/1.60 valves. Compared to what was available at the time these had very good performance potential.
How much HP gain from porting heads?
Porting the heads will definitely help airflow. You will gain 25 HP over the stock setup
Does porting heads make a difference?
But for those of you who don’t know, porting and polishing your heads is beneficial for power and efficiency of the engine. In a lot of cases, because of the increased CFM of the heads, as much as 30 horsepower is typical with good port work
Is it worth porting a diesel head?
Porting and polishing can be highly effective in a high RPM gas engine because of its much higher RPMs and associated intake/exhaust flow, but not so much in a diesel. P&P helps a diesel engine, but the effect is not as dramatic
Are LS 706 heads good?
Although the 706 heads do have smaller valves compared to 317 heads, they are still solid performers that will keep your compression ratio in the sweet spot. 706 heads can be upgraded with larger valves for even more performance if you have the spare cash laying around
Do 862 heads crack?
Yes ive personally dealt with 2 set of 862 heads that are cracked and or porous around the head bolt holes
Are 862 heads castech?
Typically, the cracked cylinder heads are marked 706 or 862 in the front corner under the oil filler (as shown in Figure 1). However, these casting numbers alone do not positively identify Castech heads. The only way to verify that the heads are Castech is to remove the valve cover
Are 862 heads aluminum?
The cylinder head for both engines is aluminum with a casting number of 862, however on the deck face area in a small cavity there is a 4.8 cast onto the cylinder head. Do not be confused by this cast number for the cylinder head is for both 4.8L and 5.3L engines
Can cracked heads be repaired?
A good garage should be able to repair and recondition a cylinder head from as little as $75, but it can also cost hundreds of dollars to do the same job. This will depend on the value of the cylinder head and the price you are quoted to repair it if it develops a crack or stops working as effectively as it should.
How do you tell if head gasket is blown or head is cracked?
How to Tell If You Have a Blown Head Gasket
- External leaks of coolant from under the exhaust gasket.
- Overheating under the hood.
- Smoke blowing from the exhaust with a white-ish tint.
- Depleted coolant levels with no trace of leakage.
- Bubble formations in the radiator and overflow compartment.
- Milky discoloration of the oil.
How much does it cost to have cylinder heads resurfaced?
Cars Direct estimates that a common four-cylinder engine rebuild can cost from $400 to $500, and as the amount of cylinders increases, so does the pricing. A six-cylinder vehicle costs about $500 to $600, and an eight-cylinder increases to between $600 and $700
How much does it cost to shave a cylinder head?
For a typical “shave and seal”, I’d expect $150-$200 depending on the head and the number of valves.. Basically, that would entail cleaning the head, resurface the deck, and clean and re-seat all the valves.. If any valves, seats, springs, etc need to be replaced, there will be additional charges..
Why would you skim a cylinder head?
Skimming a cylinder head involves resurfacing the mating surface to bring it back to the correct tolerance so it provides a tight seal. The mating surface is where the cylinder head and the cylinder meet, and if the head is not perfectly flat, leaks or ruptures can quickly occur.