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How do I know what size combustion chamber to get?
“Compression ratio is the driver of combustion chamber size,” Gamble said. “One needs to determine the chamber size needed based on the specs of the engine. Bore, stroke, head gasket, piston shape, deck clearance, and ring location all come into play in determining the compression ratio for a given chamber size.
Are Vortec heads closed chamber?
The combustion chamber has a “heart-shaped” design (‘double-quench’ design), whereas the Gen I cast heads were either open or closed chamber designs. Maximum valve lift on Vortec cylinder heads is . 460-inch to . 480-inch.
Are 882 SBC heads good?
The 441 has a reputation as a good-flowing head among the production 76cc chamber heads. In this particular case, it lost out to the 882 head, but overall it’s a decent head that responds well to pocket port work and larger 2.02/1.94 valves….
| GM 882 IRON | |
|---|---|
| Port: | 151 cc |
| I Flow @ 0.400: | 203 cfm |
How do I identify my SBC heads?
Chevy heads have often been identified by sight and most commonly by the different casting shapes on the ends of the cylinder heads. While these casting marks cannot tell specifics about the cylinder heads, they can help identify a performance head from a non-performance head.
What size heads for 350 Chevy?
A head with 180 or 185cc intake runners will work well on a typical 350 Chevy street engine that makes 400 to 450 horsepower.
What CC heads for 383?
Registered. MCSA is based on CID and rpm. A 383 that will see 5000 rpm max, a 170 ccc head will work just fine. A 383 that want to go to 7000 rpm then 210 cc head is what is needed.
How much power can Vortec heads make?
The original answer was related to modifying the heads to accept more valve lift. Our original answer combined the Chevrolet Hot cam with a set of these Vortec heads. Our estimate then and now is around 350-375 horsepower. Your question relates to porting the Vortec heads to improve the flow, which is a great idea.
How much lift can Vortec heads take?
The factory Vortec heads use a light, single-wire valvespring with a damper that generates between 70 and 80 pounds of load on the seat. Because these heads are meant to work with a 1.5:1 rocker, their tall valve guides can only handle maximum valve lifts of around 0.420 inch.
What is a Fuelie head?
It’s two half-ovals connected by a straight bar-most easily described as “two humps.” Some of these are also nicknamed “Fuelie” heads because a version appeared on fuel-injected 327-powered Chevy Corvettes. These heads appeared on 327 and 350 cubic inch engines across most of the 1960s (beginning in 1962).
Are 441 heads any good?
441 heads are good flowing heads. You just have to calculate the amount to make them usable. That is the benefit of aftermarket heads. But I used them with a good piston to build compression and 2.02/1.60 valves and made about 465 hp out of a 355 with them.
Are all SBC heads interchangeable?
One thing to keep in mind, the Gen-1 and LT-specific heads are not easily interchangeable. Each will physically bolt up to the other engine, but the water passages don’t line up. The exhaust ports and exhaust manifold-bolt holes are in the same location.
How do I know if my Chevy has a double hump head?
These heads got their nickname because of the raised identification shape on the each end. It’s two half-ovals connected by a straight bar-most easily described as “two humps.” Some of these are also nicknamed “Fuelie” heads because a version appeared on fuel-injected 327-powered Chevy Corvettes.
Are there 71 or 624 LM1 cylinder heads?
624 is the late 2nd gen LM1 head, no way they are ’71. ’71 350 heads were all ‘882s, I thought. 624 is the late 2nd gen LM1 head, no way they are ’71. ’71 350 heads were all ‘882s, I thought.
Is the 76cc cylinder head good or bad?
No 76cc small block head is worth time or effort or running on a engine, they are quite simply the worst head chevy ever put on a small block , terrible chamber design and spark plug location. Gas guzzlers ! You must log in or register to reply here.
When did Chevrolet start using small block heads?
Starting with the 1975 model (fall of 74) Chevrolet began cutting corners on the SB heads, such as the 462624 head. They were lighter, thinner castings, had an additional exhaust crossover passage (more heat) in the center of the head.
What kind of head does a Chevy Chevelle have?
Don’t know much about them but they are 76 cc heads. Look here. I’ve pointed this out several times before here and let me cover it again. Starting with the 1975 model (fall of 74) Chevrolet began cutting corners on the SB heads, such as the 462624 head.