Table of Contents
How many CFM do Vortec heads flow?
230-cfm
He took a set of Vortec right out of the box and clamped them down to his Superflow bench. With 230-cfm max flow, these heads are actually pretty good, except when you notice that peak flow is at .
What do stock 243 heads flow?
GM 243 (LS6) and 799 (LS2), 218 cc. The 218-cc LS6/LS2 head is a mild upgrade from the basic performance rebuild, which boosts flow by 32.2 cfm on the intake side and 28.5 cfm on the exhaust side, at . 600-inch lift, despite the more cost conscious machine work.
How good are 882 Chevy heads?
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 |
Is it worth porting Vortec heads?
The Vortec heads offer great intake port flow despite the rather small 1.94-inch valves. This is often called pocket porting and the area just below the 45-degree valve seat is where you can gain the greatest airflow improvement for the least amount of effort.
Are 706 heads better than 243 heads?
The 243 head has 2.0″ intake valves and 1.55 exh. The 706 uses 1.89 and 1.55 respectively. The 243 is an excellent head, but losing compression coupled with a larger intake valve in a tiny bore engine isn’t a good combo in comparison to the 706.
What did LS 243 heads come on?
The 243 head came on the more powerful LS6 engine from 2001 to 2006, and was used in C5 Corvettes. Later engines like the truck-spec LQ9 and LQ4 used the exact same port design as the LS6’s 243 heads, but had 6 cc larger combustion chambers.
Are Flo Tek heads any good?
The flow-tek heads are good. budy who owns a machine shop says the castings are well done, and decent valves. Says after some rework they are good to go for the price can’t go wrong.
What did Chevy 882 heads come on?
Re: 882 heads the 882 heads were installed on the 350 ci. and 400 ci engines(400 heads had steam holes). The 882 castings had a double heat-riser passage and were prone to cracking beacuse they ran so hot. If you have these on your engine, get rid of them.
How much does stock flow vary from head to head?
Stock flow numbers routinely vary from head to head and port to port so it is inevitable that the numbers will vary a little. Note: These are average numbers. Stock ports can vary by +/- 8 cfm in the same head.
What kind of head did Chevy small block engines have?
The selection list is basically rather thin for today’s performance engines. The earliest 265 and 283 small-blocks relied on an iron Power Pack head that featured 58-cc chambers and tiny 1.72/1.50-inch valves. The bigger heads to follow were the “double-hump” heads championed by the mid-’60s 327 engines.
What’s the difference between Chevy 462 and 64 cc heads?
Older heads like the 461 and 462 heads do not have these bolt holes, requiring the use of a short water pump and different brackets. Another major difference between the older 64-cc heads and the later 76-cc heads are the accessory drive holes located in the front of each pair of heads.
How big is the intake valve on an iron ram?
Ported Heads (2.02″ intake valves) For our EQ Iron Ram heads or the Indy LA-X heads. Read ’em and weep bow-tie boys!