[firebomb71]

Hey all me again,
gotta quick question. I just picked up a claimer/circle track engine.
Its a 350 a guy just rebuilt does anyone know anything about how these run? rpm/hp/torque? and what kind of compression do they usually have in these type engines?
I did pull a valve cover off and it has a set of 3932441 heads on it.
any info on this would be great. thinkin of useing it in my firebird.
thanks, Chris.

[Mad Maggot]

If the 3932441 is a production head casting number, you may be disappointed with the results of this motor if it is designated a "race" motor. Production heads flow not much more than 200 cfm on the intake port (and that's one of the good ones), and this translates to a peak of around 400-450 horses, depending on pressure drop from varying displacements. If it is not a production head, give me some specs on this motor and I can give you a ballpark on how much power it will make.

[trees]

The 441 heads were the high performance heads of the 60s and are great for a street driver. If there is an X cast after the 1, they flow a little better. You will not see 200 cc flow out of them. Also, these heads came with either a 1.95 or a 2.02 intake valve and since the motor was built by a circle track engine builder, bet it is the larger valve head. These heads have smaller combustion chambers, thus the compression should be in the 9.5-10.5 range.

Trees

[k-star]

A claimer engine could be almost anything. They are usually built to what ever the rules of the track they race at allow.... The deal behind them is that any one finishing in the top 3rd to fifth place can buy anothers,or the winners engine for a set price... So it is almost impossable to guess at what it might be. Some tracks have cam shaft rules others don't and so on.... If it was built for a track with no compression limit then it could be almost any compression..

Can you find out from the guy you bought it from what track it was built for??? And then maybe look into there rules this might give a better idea of what is done to it....

Keith

[firebomb71]

ok thanks for the info guys I think ill pull it apart to see what was actually done to it.

and yeah they are production heads

[firebomb71]

ok heres what i found so far-- heads are the small ones not 202's its bored 40 over cam & lifter look new but dont know what kind or size block has the 010 cast into it under timing cover and back of block no ridge in cylinder walls rod & crank bearings show no wear dont know the make of the pistons or comp ratio ill let yall now more as I find out.

[MI2600]

The 441s have 76cc chambers and are heavy castings.

With flattop pistons and, if the block hasn't been decked or the heads cut, you're looking at a compression of about 8.5 + -.

Those heads are drawing good prices on EBay.

[firebomb71]

so if i got flat top pistons what would be the least costly way to get @9.5 to 10 to 1 compression with these heads?

[79 cutlass supreme]

Hey, just wondering if you would be interested in selling those heads? If so how much, and what kind of condition are they in?

[Docs91RS]

circle track engines like the one you have are typically run in sportman type low buck classes. They have rules that restrict the engines to the use of production cast iron heads and stock compression ratios. The reason being is to keep the needed investment down so the average low buck racer doesn't have to try and compete with a guy who can afford better parts. The factory heads required are one of the things used to level the playing field and are far from the best head for making power. The camshafts in these engines typically run a very tight lobe separation on the order of 104 to 108 degrees. This is done to raise mid and upper rpm compression pressures so that the engine make more power in the mid to upper rpm range whhere these engines spend most of thier life. This also allows the engine to maximize the amount of air and fuel the restricted heads can feed the engine. All this severly effects idle quality, low speed torque, and driveability which isn't a concern with these engines. Another thing to take note of is these engines use cast pistons.

With that said, If you plan on running this engine in a street/strip type car and plan on making some HP I would recommend selling those heads, cam and pistons to some circle track racer. Then buy at the very least hyperutectic piston, a more street friendly cam and some vortec heads.

Doc

[Docs91RS]

Damn didnt notice how old this thread was...what a waist of time this was