SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: coors909 on November 08, 2015, 08:56:28 PM
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I wanted to know which number tells me what heads I have? These are the numbers I found gm11T or A2170
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I wanted to know which number tells me what heads I have? These are the numbers I found gm11T or A2170
Sent from somewhere in Cali
Probably foundry and a date.
The number you want to use for identification is the casting number. Typically cast into the head under the valve cover.
GT
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Probably foundry and a date.
The number you want to use for identification is the casting number. Typically cast into the head under the valve cover.
GT
Ok. Those were the two numbers on the head under the valve cover. Maybe there is another one under there somewhere
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Are they GM heads?
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Going to be a 6 or 7 digit number. Two very common cylinder heads found on Jet boats are 353049 oval port and 6272990 rectangle port.
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3964290 is what I have
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3964290 is what I have
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3964290....69-70...oval..CLOSED..396, 402, 427, 454, 101cc chamber
Large or small hex spark plugs used.
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What are 6272292?
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What are 6272292?
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Lol
6272292....70-78...oval...OPEN...402, 454
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Lol
6272292....70-78...oval...OPEN...402, 454
thanks gt so are these worthless like the rest of my motor?😭
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thanks gt so are these worthless like the rest of my motor?😭
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Not necessarily worthless.
Good heads for low rpm range horsepower. Would respond well to a good RV grind cam if your compression ratio was high enough (thinking 9.5:1).
For the demands of a jet pump, probably not the right head. Work good in an I/O.
GT
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Not necessarily worthless.
Good heads for low rpm range horsepower. Would respond well to a good RV grind cam if your compression ratio was high enough (thinking 9.5:1).
For the demands of a jet pump, probably not the right head. Work good in an I/O.
GT
ok I'll toss them in the scrap pile too!
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I'll take them ..lol
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ok I'll toss them in the scrap pile too!
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Well since you're gonna scrap them out because they are "worthless"... I'll take your junk and make it a little treasure for someone else... Thanks for the donation! Where can I pick them up? :thumbup: :thumbup:
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Well since you're gonna scrap them out because they are "worthless"... I'll take your junk and make it a little treasure for someone else... Thanks for the donation! Where can I pick them up? :thumbup: :thumbup:
That's what I'm saying I take them "worthless " heads lol
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That's what I'm saying I take them "worthless " heads lol
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I've made some decent power on jet boat motors with those "worthless" heads... So I'll take all of them out of everyone's trash barrel! Lol!
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I'm looking for a set of those heads
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Well these r pretty good heads if matched with the right Pistons to create higher compression they cc at 110 just not big enough for the power I want might be up for sale soon
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I have a pair of 049 heads that need to be rebuilt if anyone is interested. $50
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I have a pair of 049 heads that need to be rebuilt if anyone is interested. $50
Where are you located?
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Fontana