Heads???

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10-28-2008, 11:16 AM
co68956

Heads???

i just bought my first big block from a co-worker its a '92 454 bored .060 with all machine work done and a few new parts but still has production heads... i ran the casting numbers and it came up as '91 and up, 366/427, closed chamber, genV, 2.06"/1.72" valves. im just looking to build a street/strip motor more on the street side for my '67 c-20 i was wandering if i can get enough power from these heads, i can port and polish them myself to get a little more flow but im not going to do any major reshaping of the ports. so whats your opinion, paper weights or useable?
10-28-2008, 11:36 AM
pat mccarthy

well how much power ?them heads are a TQ head and not a hp head .your not going to do much in the ports to get any thing out of them. you will see more power in the valve job and the bowl job .if your looking for big number in hp look for a better heads
10-28-2008, 12:48 PM
co68956

well not looking for high rpm power im thinkin i want to keep rpms at 5500 max and id perfer the torque down low, its going into a tank of a truck with 4.11 gears and th400
10-28-2008, 03:22 PM
co68956

im shooting for somewhere in the middle of 500 and 600 hp and about the same for torque
10-28-2008, 05:30 PM
pat mccarthy

Quote:

Originally Posted by co68956

im shooting for somewhere in the middle of 500 and 600 hp and about the same for torque

would be hard to see that much out of them heads
10-28-2008, 09:16 PM
co68956

thanks tor the advice i appreciate it i guess ill start saving up... for now ill probly use the old ones beacuse it will be a while before i can afford a set
11-01-2008, 02:23 AM
colesscamaro

Closed Chambers Limit Your Options

If you are looking at buying heads, I would recomend looking at open chambers, the old rule, you can run closed chamber or open chamber pistons, with open chamber heads, but you cant run an open chamber piston with a closed chamber head, really rings true. And if your on a budget, like most oif us are, the available "off the shelf pistons" for closed chambers is very limited if you are going to run pump gas. The closed chamber heads are great if you are looking at building a motor with a compression ratio of 12.0/1 and up, But there are very few closed chamber options for piston/ head combinations that will keep your compression in the range of 10.0/10.5/1 where you need to stay to be able to run pump gas. It's just something to consider when you start shopping for heads.
11-01-2008, 06:43 AM
pat mccarthy

Quote:

Originally Posted by colesscamaro

If you are looking at buying heads, I would recomend looking at open chambers, the old rule, you can run closed chamber or open chamber pistons, with open chamber heads, but you cant run an open chamber piston with a closed chamber head, really rings true. And if your on a budget, like most oif us are, the available "off the shelf pistons" for closed chambers is very limited if you are going to run pump gas. The closed chamber heads are great if you are looking at building a motor with a compression ratio of 12.0/1 and up, But there are very few closed chamber options for piston/ head combinations that will keep your compression in the range of 10.0/10.5/1 where you need to stay to be able to run pump gas. It's just something to consider when you start shopping for heads.

that may not ring true you better check your close chamber piston with a open chamber pistons. the old close chamber O port heads will hit on the sides of the close chamber RECT port head pistons the hi cr pistons on the EX side
11-02-2008, 08:31 PM
co68956

when i bought the motor it came with a set of brand new speed-pro pistons .060 over i have no idea how to tell if they are open or closed chamber pistons i am in denver right now but will check when i get back home... if my memory serves me right they have the valve grooves on only one side of the piston. what do i need to check for to see which pistons theese are?