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Old 05-21-2012, 06:46 PM
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identifying what heads i have

got a brand new motor put in rebuilt out of a 75 monte carlo. got bored one day last week and decided to run the car at test and tune night at my local track and ran a 11.45. then i was asked by a local racer what kind of heads i have on my motor and i didnt know because i lost all my paper work that came with my motor. so i was curious and pulled the value cover the next day and found these numbers stamped on the head. GM15, M60, and 8927185 does any one know what these numbers mean. im lost
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Old 05-21-2012, 06:54 PM
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3297185 307/327/350 57-67 1.72/1.50
These are small valve, small port, large 74cc chamber smog heads.
They are designed to give the engine very high torque at low RPM
due to the small valve size.
However also, they run out of breath around 4000 RPM due to the same reason, the small valve size.
Is the track you ran on 1/8th mile or 1/4 mile?
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Old 05-21-2012, 07:03 PM
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1/8th a mile im sure. so are these heads bad. all i know about them is they had work done to them. i also been told that these heads are holding be back. the car seems to be pretty quick though well maybe just for me.
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Old 05-21-2012, 07:13 PM
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all i seem to know about my motor is its bored .60 over, eldelbrock perfomer intake, holley 650 carb, pop up pistons, roller cam dont know the lift and no ac with 3.73 gears in the rear end. i would like to change the heads if it will give be better performance but would like it to still run on pump 93 gas. if anyone can point me in the right direction ill be happy. i have 1100 saved up for some heads if neccesary. man i wish my engine builder didnt moved :/
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Old 05-21-2012, 07:17 PM
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If you ran 11's in the 1/8th mile the car is slow,,, I think it's got more wrong with it than just the heads. I would get a set of RHS Vortec heads and a matching Vortec intake, then stab in cam, set of headers and get it tuned correctly and it'll drop your ET down to around the 8.50 mark.
Years ago on a close to stock 350 combo I ran a 9.00 flat with 3.23 gears in a Olds Cutlass.
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Old 05-21-2012, 07:33 PM
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i coulde be mistaken if its a 1/8 or 1/4 a mile. i just went to a place called dorchester dragway and ran the car just for the hell of it. i have flowtech headers on now.the cars seems quick to me. but now im starting to think otherwise kind of getting dissapointed in all the money i spent lol
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Old 05-21-2012, 08:06 PM
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Google shows it is 1/8 mile track,
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Old 05-21-2012, 09:25 PM
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talked with a friend of mine and he said the motor is fine but i should change the heads. he said my times was bad because i have traction issues and need a posi carrier with the 3.73 gears. so i think that and some good tires are my next investment. also i wanna try some after market heads. so it looks like this summer imma be back at breaking the piggy bank
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